# SERVICE BULLETIN

This service bulletin is sent to each operator that has purchased the affected equipment from Comtek. If an operator has leased or purchased the equipment from a source other than Comtek, the operator that originally purchased the equipment must forward this service bulletin to the lessee or new owner.

CL - 600 - 2B19 Canadair Regional Jet (CRJ) 100/200/440

ATA S ystem : 25 - 52 Document Number : COMSB - 25 - 52 - 001

R evision: A Date: 29 December 2011 SUBJECT: Equipment/Furnishings – Cargo Compartment Linings – Modification

and Replacement of Liners in the Cargo CompartmentService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 2 of 92 

### 1. PLANNING INFORMATION A. Effectivity

Aircraft Affected (1) CL - 600 - 2B19 Canadair Regional Jet ( CRJ ) 100/200 /440 aircraft with serial numbers 7003 through 7067, 7069 through 7857 and 7877 that are fitted with Comtek Advanced Structures aftermarket cargo liners produced under any of the following STCs. Only the aircraft that have a cargo compartm ent with the dimensions below are affected. These aircraft are referred to as the “North American Configuration” in the Bombardier documentation. Applicable STC Approvals

 TCCA : SA01 - 19 ( Issue 1 , dated 26 - Jan - 2001 )

 FAA : ST01292NY (Issued 22 - Feb - 2001 )

 EASA : 208 - SI - 0077 (Issued 12 - Dec - 2001) TA0606 ( Issue 1 , dated 24 - Jun - 2002 )

92.00 in FWD FS621.00 FS559.00+80.50Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 3 of 92 

### B. Reason

Condition (1) The Comtek aftermarket cargo liners produced under the STC approvals listed in Section A for the CL - 600 - 2B19 CRJ 100/200/440 do not meet the flammability requirements of FAR 25.855

. Objective/Benefit (2) This service bulletin provides the procedure to rework or replace the liners in the cargo compartment and modify some floor panels. After incorporation of this service bulletin, the Comtek aftermarket cargo lin ers will fully comply with the FAR 25.855 requirements. 

### C. Description The cargo compartment door is opened. The sidewall liners and rear b ulkhead liners are removed. Existing Comtek liner panels are reworked and re identified. At the option of each operator, parts can be replaced instead of being reworked. New Comtek panels are installed to replace any remaining OEM panels. Panels are installed and various existing functional tests are performed. 

### D. Compliance Th is is a r e quired Service Bulletin. This service bulletin should be incorporated before 31 - July - 2014, unless otherwise directed by the airworthiness authority of the operator. This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs). 

### E. Approvals This service bulletin is approved by Transport Canada and by TCCA Design Approval Organization 96 - O - 02. 

### F. Labor Requirement This service bulletin req uires approximately 80 person - hours.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 4 of 92 

### G. Materials All kits are available from Comtek Advanced Structures. Submit requests for quotation to: Comtek Advanced Structures 1360 Artisans Court Burlington, Ontario, L7L 5Y2, Canada Phone: (905) 331 - 8121 Fax: (905) 331 - 8125 

### H. Tooling Refer to paragraph 3.C for a list of special tools and equipment required to incorporate this service bulletin. 

### I. Weight and Balance This service bulletin affects the weight and balance of the aircraft. The weight of each component removed or installed and the FS location of th at component should be recorded. The change in weight and balance should be det ermined from these measurements and entered into the weight and balance records for the aircraft. 

### J. Electrical Load Da ta Not Changed. 

### K. References

 Bombardier Aircraft Maintenance Manual (CSP A - 001 R evision 44 or later approved revision)

 Bombardier Structural Repair Manual (CSP A - 008 R evision 31 or later approved revision)

 Comtek Aircraft Maintenance Manual Supplement, Component M aintenance Manual and Illustrated Parts Catalog (COMAMM - 011 Revision F or later approved revision )Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 5 of 92 

### L. Other Publications Affected

 Comtek Aircraft Maintenance Manual Supplement, Component M aintenance Manual an d Illustrated Parts Catalog (COMAMM - 011)

. Discard and destroy COMAMM - 011 Revision E or earlier revision and replace with COMAMM - 011 Revision F or later approved revision. 

### M. Nomenclature In the context of this Service Bulletin, the term “Pre - SB ” means prior t o incorporation of this service bulletin. The term “Post - SB ” means after the incorporation of this service bulletin or re - identification of parts according to this service bulletin.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 6 of 92 

### 2. IMPLEMENTATION INSTR UCTIONS A. Job Setup Reference Information :

Reference Description AMM 12 - 00 - 07 - 861 - 801 Connect External AC Power AMM 20 - 21 - 00 - 910 - 801 Torque Procedures for Threaded Fasteners AMM 20 - 21 - 00 - 910 - 802 Torque Procedures for Plumbing Lines AMM 21 - 51 - 00 - 790 - 801 Leak Test of the Air Conditioning System AMM 21 - 51 - 15 - 000 - 801 Removal of the Pack Discharge Ducts AMM 21 - 51 - 15 - 400 - 801 Installation of the Pack Discharge Ducts AMM 24 - 00 - 00 - 910 - 801 Electrical/Electronic Safety Precautions AMM 25 - 51 - 01 - 400 - 801 Installation of the Cargo Restraint Netting AMM 25 - 51 - 01 - 400 - 802 Installation of the Cargo Restraint Posts AMM 25 - 52 - 01 - 000 - 801 Removal of the Cargo Compartment Sidewall Linings AMM 25 - 52 - 01 - 000 - 802 Removal of the Cargo Compartment Rear Bulkhead Linings AMM 26 - 15 - 01 - 0 00 - 801 Removal of the Cargo Smoke Dete ctor AMM 26 - 15 - 01 - 400 - 801 Installation of the Cargo Smoke Detector AMM 26 - 15 - 00 - 710 - 801 Operational Test of the Cargo Smoke Detection System AMM 26 - 25 - 00 - 710 - 801 Operational Test of the Cargo Fire Extinguishing System AMM 26 - 25 - 07 - 000 - 801 Removal of the Cargo Fire - Extinguisher Discharge - Line AMM 26 - 25 - 07 - 400 - 801 Installation of the Cargo Fire - Extinguisher Discharge - Line AMM 33 - 31 - 01 - 000 - 801 Removal of the Service Light Assembly AMM 33 - 31 - 01 - 400 - 801 Installation of the Service Light Assembly AMM 33 - 31 - 00 - 710 - 801 Operational Test of the Service LightsService Bulletin COMSB - 25 - 52 - 001

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Reference Description AMM 51 - 22 - 28 - 340 - 801 Cementing of Silicone Rubber AMM 51 - 23 - 00 - 100 - 801 Preparation of Surfaces for Sealing AMM 51 - 23 - 00 - 390 - 807 Gap Sealing Procedure AMM 51 - 23 - 00 - 390 - 815 Curing of Sealant AMM 51 - 23 - 00 - 910 - 801 Sealant Safety Precautions AMM 52 - 31 - 00 - 000 - 801 Removal of the Cargo Compartment Door AMM 52 - 31 - 00 - 400 - 801 Installation of the Cargo Compartment Door AMM 52 - 31 - 00 - 710 - 801 Operational Test of the Cargo Compartment Door AMM 52 - 31 - 00 - 820 - 801 Adjustment of the Cargo Compartment Door AMM 52 - 70 - 02 - 710 - 801 Operational Test of the Cargo - Compartment Door Warning System AMM 53 - 01 - 01 - 000 - 804 Removal of the Cargo Compartment Floor Panels AMM 53 - 01 - 01 - 400 - 804 Installation of the Carg o Compartment Floor Panels SRM 51 - 23 - 00 Pressure, Environmental, Fuel Tank and Fire - Wall Sealing SRM 51 - 26 - 00 Cleaning SRM 51 - 40 - 11 How to Prepare Fastener Holes SRM 51 - 41 - 02 Bolts, Screws and Related Items SRM 51 - 42 - 06 Solid Rivets SRM 51 - 42 - 10 Blin d Rivets

– General SRM 51 - 42 - 11 Cherry Lock Rivets

– General SRM 51 - 42 - 13 Cherrymax Blind Rivets SRM 51 - 45 - 00 Nutplate (Anchor Nuts)

– GeneralService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 8 of 92

Tolerance Information :

Linear Tolerances Angular Tolerances X.XX in (X.X mm) X.X in (X mm) ± 0.5  ̊ ± 0.03 in ± 0.1 in ± 0.8 mm ± 3 mm Note: The tolerances above apply to the dimensions given in this service bulletin except if otherwise specified. Obey all electrical/electronic safety precautions (1) (Refer to AMM 24 - 00 - 00 - 910 - 801) Obey all the sealant safety precautions (2) (Refer to AMM 51 - 23 - 00 - 910 - 801) Open the cargo compartment door (3) If required for access, remove the cargo compartment door (4) (Refer to AMM 52 - 31 - 00 - 000 - 801) Open the aft equipment compartment door

. (5) Open, safety, and tag the circuit breakers that f ollow plus any others that (6) provide power to the cargo compartment or that may affect worker safety. CB Panel CB Number Name Zone CBP - 1 F11 10 TH ST B/AIR SOV L 221 CBP - 1 G1 CARGO FIREX 2 221 CBP - 1 J1 L AIR COND UNIT 221 CBP - 1 K7 RAD ALT 221 CBP - 1 M2 ENG IGN A 221 CBP - 1 M3 ENG IGN B 221 CBP - 1 M4 ENG START R 221 CBP - 1 M5 ENG START L 221 CBP - 1 N12 XFER/APU APU ECU 221 CBP - 1 P1 CARGO FIREX 1 221Service Bulletin COMSB - 25 - 52 - 001

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CB Panel CB Number Name Zone CBP - 1 R5 APU FIRE EXT A 221 CBP - 1 R6 APU FIRE EXT B 221 CBP - 2 F11 10 TH ST B/AIR SOV R 222 CBP - 2 J1 R AIR COND UNIT 222 CBP - 2 T1 SERV LTS 222 CBP - 2 T3 SRV LTS 222 CBP - 4 B1 10 TH ST B/AIR ISOL 222 CBP - 4 B12 DOOR INDICATION 222 CBP - 5 A1 APU ACT 311 CBP - 5 A13 LIGHTS SERV 311 Remove and retain the Inlet Duct screen assembly located near (7) FS559+112L and STGR 17. Remove and retain Exhaust Duct screen assembly located near the center (8) of the cargo compartment ceiling. Remove the cargo smoke detector (Refer to AMM 26 - 15 - 01 - 000 - 801). (9) Remove the cargo lights (Refer to AMM 33 - 31 - 01 - 000 - 801). (10) Remove the fire exti nguisher discharge line (Refer to AMM 26 - 25 - 07 - 000 - (11) 801). Removed the louvered window cage from the forward bulkhead. (12) If angles have been installed on the forward bulkhead (per C&D Zodiac (13) Service Bulletin B301002 - 25 - 01, B301002 - 25 - 02. B301003 - 25 - 01 or B3010 03 - 25 - 02), remove and discard the angles. Remove tie rod caps and harness caps. (14)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 10 of 92 For step (15) , R efer to Figure 1 (Sheet 1) on Page 59 :

Remove the cargo compartment sidewall linings o n the right - hand and left (15) hand side of the cargo compartment . Keep items (1), ( 2), (3), (4), (5), (6) and (7). Remove cargo compartment ceiling panels. For each part , look up the part number in the “Disposition of Parts” Table (16) starting on Page 50 of this Service Bulletin. Parts with the Disposition Code (DC) “DIS” should be di scarded and do not need to be reworked according to the instructions of this Service Bulletin. Parts with the Disposition Code “RWK” must be reworked according to this Service Bulletin. All new and reworked parts must be installed according to the instruct ions of this Service Bulletin. All non - Comtek cargo liner panels are to be removed and discarded and replaced with Comtek parts. Remove any sealant used to seal the lining panels that have been (17) removed. NOTE : Use only non - metallic scrapers. Metal scrapers may cause damage to the structure. Remove and discard the liner assemblies and the FPC foam sheet on the (18) rear bulkhead near the door track. Remove and discard the door shroud. (19) For Steps (20) through (22) , Refer to Figure 1 (Sheet 2) on Page 60 :

Remove and discard the Center Aft Wall Kickplate (8). (20) Remove the D uct (9). Refer to “D isposition of Parts” starting on Page 50 of (21) this Servic e Bulletin. If the Disposition C ode for the part number of the Duct (9) is listed as DIS, discard the duct and obtain the part listed as “Post - SB P/N.” If the Disposition Code is RWK, retain the Duct. If the duct is a non - Comtek part, remove and discard the duct. Remove and discard the aft wall angles (10) and (11). (22) Check the part number of the aft wall panels (12), (13) and (14) against (23) the table “Disposition of Parts” starting on Page 50 of this Service Bulletin. For all panels with the Disposition Code RWK, d o not re move the panel.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 11 of 92

For non - Comtek panels and for panels with the Disposition Code DIS, remove and discard the panel and install new parts per steps (90) through (92) of the Procedure section. Remove and discard the ceiling liner panels and tie rod cap s . (24) Remove and discard the forward liners, if they have been installed. (25) 

### B. Procedure Refer to Figure 1 (Sheet 1) on Page 59 :

Remove the P - Seal s and foam tape as follows: (1) NOTE: Use only non - metallic scrapers when removing P - Seals and foam

tape . Metal scrape rs or other sharp tools may damage the panels, harness caps and tie rod cap s. (a) Remove the P - Seal from the right - hand lower sidewall panel (2)

. (b) Remove the foam tape from the right - hand lower sidewall panel (2). (c) Remove the P - Seal from the right - hand upper sidewall panel (3)

. (d) Remove the P - Seal from the lower right - hand harness cap (4)

. (e) Remove the foam tape from the lower right - hand harness cap (4) (f) Remove the P - Seal from the upper right - hand harness cap (5)

. (g) Remove the foam tape from the upper right - hand harness cap (5). (h) Remove the foam tape from the edge of the lower right - hand tie rod cap (6)

. (i) Remove the foam tape from the edge of the upper right - hand sidewall tie rod cap (7)

. (j) Ensure that all adhesive residue is removed from the panels, harness caps and tie rod covers

.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 12 of 92

Reinstall foam tape as follows: (2) (a) Clean the surface and install H T - 805(A) foam tape to the right - hand

lower sidewall panel (2) in the same location as the original foam tape. (b) Clean the surface and install HT - 805(A) foam tape to the lower right hand harness cap (4) in the same location as the original foam tape. (c) Clean th e surface and install HT - 805(A) foam tape to the right - hand upper harness cap (5) in the same location as the original foam tape. (d) Clean the surface and install HT - 805(A) foam tape to the lower right hand tie rod cap (6) in the same location as the original foam tape. (e) Clean the surface and install HT - 805(A) foam tape to the upper right hand tie rod cap (7) in the same location as the original foam tape. On aircraft fitted with duct assy CRJLA09 - 03 or - 07 (Pre - SB ) Refer to Figure 1 (Sheet 2) on Page 60 :

Remove the P - Seals and foam tape from the duct ( 9 ) as follows: (3) NOTE: Use only non - metallic scrapers when removing P - Seals and foam

tape. Metal scrapers or other sharp tools may damage the panels, harness caps and tie rod caps. (a) Remove the P - Seal from the duct ( 9 ). (b) Ensure that all adhesive residue is removed from the panels

. Reinstall foam tape on the duct ( 9 ) as follows: (4) (a) Clean the surface and install HT - 805(A) foam tape to the duct ( 9 ) in the

same location as the original tape. (b) Using a permanent ink pen or equivalent, identify the duct ( 9 ) according to the following table:Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 13 of 92

Pre - SB Part Number Post - SB Part Number CRJLA09 - 03 CRJLA183 - 003 CRJLA09 - 07 CRJLA183 - 00 7 On all aircraft Refer to Figure 2 (Sheet 1) on Page 61 :

Install the ceiling center support (3) using washers (1) and screws (2). (5) Refer to Figure 2 (Sheet 2) on Page 62 :

Temporarily affix the for ward liner pane l s (4) , (5) and (6)

. (6) Refer to Figure 2 (Sheet 3) on Page 63 :

Temporaril y affix the joint overlaps (8) and (9). (7) Temporarily affix the kickplates (10) and (11). (8) Refer to Figure 2 (Sheet 4) on Page 64 :

Temporarily install the l ower right - hand sidewall panel (4). (9) Temporarily install the u pper right - hand sidewall panel (5). (10) Temporarily install the lower right - hand harness cap (6). (11) Refer to Figure 2 (Sheet 7) on Page 67 :

Temporarily install the right - hand ceili ng panel (4 ). (12) Temporarily install the right - hand upper harness cap (5). (13) Refer to Figure 2 (Sheet 6) on Page 66 :

Temporarily install the left - hand lower sidewall panel (4). (14) Temporarily install the left - hand upper sidewall panel (5 )

. (15) Temporarily install the left - hand lower harness cap (6). (16)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 14 of 92 On aircraft fitted with tie rod cap CRJLA050 - 001 ( Pre - SB ) Refer to Figure 4 (Sheet 2) on Page 76 :

Temporar ily install tie rod cap (5) and tie rod cap flange (6). (17) On all aircraft Refer to Figure 2 (Sheet 8) on Page 68 :

Temporarily install the left - hand ceiling panel (4). (18) Temporarily install the left - hand upper harness cap (5). (19) Refer to Figure 3 (Sheet 1) on Page 72 :

Temporar ily attach the angles (6), (7), (8) and (9). (20) Refer to Figure 3 (Sheet 3) on Page 74 :

Temporarily attach the angles (6) and (7). (21) Refer to Figure 4 (Sheet 1) on Page 75 :

Temporarily attach the tie rod caps (6) and (7) (22) On aircraft fitted with tie rod cap CRJLA 039 - 001 ( Pre - SB )

Temporarily attach tie rod cap flange ( 9 ) (23) On aircraft fitted with tie rod cap CRJLA 049 - 001 ( Pre - SB ) or CRJLA048 - 001 ( Pre SB ) Temporarily attach tie rod cap flange ( 8 ). (24) On aircraft fitted with harness cap CRJLA11 - 03 or - 07 ( Pre - SB ) Refer to Figure 5 (Sheet 1) on Page 77 :

Temporarily attach the harness cap flange (5)

. (25)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 15 of 92 On aircraft fitted with harness cap CRJLA021 - 003 ( Pre - SB ) or - 0 0 7 ( Pre - SB ) Refer to Figure 5 (Sheet 1) on Page 77 :

Temporarily attach the harness cap flange (7). (26) On aircraft fitted with harness cap CRJLA11 - 03 or - 07 ( Pre - SB ) Refer to Figure 5 (Sheet 2) on Page 78 :

Temporarily attach the harness cap flange (5). (27) On aircraft fitted with harness cap CRJ LA021 - 003 ( Pre - SB ) or - 0 0 7 ( Pre - SB ) Refer to Figure 5 (Sheet 2) on Page 78 :

Temporarily attach the harness cap flange (7). (28) On aircraft fitted with harness cap CRJLA043 - 003 ( Pre - SB ) Refer to Figure 5 (Sheet 3) on Page 79 :

Temporarily attach the harness cap flange (5). (29) On aircraft fitted with harness cap CRJ LA047 - 003 or - 07 or - 015 ( Pre - SB ) Refer to Figure 5 (Sheet 3) on Page 79 :

Temporarily attach the harness cap flange (7). (30) On aircraft fitted with right - hand lower sidewall panel CRJLA03 - 03 or - 07 or - 11 or

- 15 ( Pre - SB ) or CRJLA015 - 003 or - 007 ( Pre - SB ) Refer to Figure 7 (Sheet 1) on Page 81 :

Backdrill the lower right - hand sidewall panel (5) as follows: (31) (a) Mark the cent er of the slots in the angles (6 ), ( 7 ), (8 ) and ( 9 ). (b) At the center of each slot, dri ll through the sidewall panel (5 ) with a drill of diameter 0.190 in

.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 16 of 92 On aircraft fitted with right - hand upper sidewall panel CRJLA023 - 003 or - 007 ( Pre SB ) Refer to Figure 7 (Sheet 2) on Page 82 :

Backdrill the upper right - hand sidewall panel ( 5) as follows: (32) (a) Mark the center of the slots in the angles (6) and (7). (b) At the center of each slot, drill through the sidewall panel (5) with a drill of diameter 0.190 in. On all aircraft Refer to Figure 6 (Sheet 1) on Page 80 :

Backdrill the forward bulkhead as follows: (33) (a) Use the holes in the liner panels (4), (5) and (6) as a guide. (b) Drill through the l iner panel s (4 ) , (5) and (6) and into first skin of the bulkhead . Stop drilling once the first skin of the bulkhead has been penetrated; do no drill into the opposite skin. Hole diameter should be 0.190 in. NOTE: Take care not to damage the opposite face skin. On aircraft fitted with right - hand aft wall panel CRJLA017 - 003 ( Pre - SB ) Refer to Figure 8 (Sheet 1) on Page 83 :

Backdrill the right - hand aft wall panel (5) as follows: (34) (a) Mark the center of the holes i n the angles (8), (9), (10) , (11) and (12) and the Center Joint Overlap (7). (b) At the center of each hole, drill through the right - hand aft wall panel (5) with a drill of diameter 0.190 in.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 17 of 92 On aircraft fitted with center aft wall panel CRJLA07 - 03 ( Pre - SB ) Refer to Figure 8 (Sheet 1) on Page 83 :

Backdr ill the center aft wall panel (6 ) as follows: (35) (a) Mark the center of the holes in the angles (8) and (16) and the center joint overlaps (7) and (15). (b) At the center of each hole, drill through the center aft wall panel ( 6 ) with a drill of diameter 0.190 in. On aircraft fitted with left - hand aft wall panel CRJLA019 - 003 ( Pre - SB ) Refer to Figure 8 (Sheet 2) on Page 84 :

Backdrill the left - hand aft wall panel (17 ) as follows: (36) (a) Mark the c enter of the holes in angle ( 16 ) , center joint overlaps ( 15 ) and wall extension (1 8 ). (b) At the center of each hole, drill thro ugh the center aft wall panel (17 ) with a drill of diameter 0.190 in. On all aircraft Refer to Figure 10 (S heet 1) on Page 86 :

Add four holes to the r ight - hand lower harness cap (7) , sidewall panels (5) (37) and (6) and channels as follows: Note: These holes are already present in Post - SB parts CRJLA205 - 003 and - 007, CRJLA201 - 003 and - 007 and CRJLA206 - 003 and - 007. The backdrilled holes are not present in the channels on Pre - SB aircraft. (a) Mark two locations 3.00 inches aft of the forward - most existing holes in the harness cap (7) as shown. This location must be in - line with the existing row of holes.Service Bulletin COMSB - 25 - 52 - 001

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(b) Identify the existing holes 8.50 inches apart in the harness cap (7)

. Mark two locations 3.00 aft of the forward - most of these two holes as show. The location must be in - line with the existing row of holes. (c) Drill 0.190 inch holes at the locations marked. Holes pass through the harness cap (7) , the liner panels (5) and (6) and the channel behind the liner panels. Add four holes to the right - hand upper harness cap, sidewall panel and (38) channel as follows: Note: These holes are already pre sent in Post - SB parts CRJLA207 - 003, CRJLA206 - 003 and - 007 and CRJLA220 - 003, - 007 and - 011. The holes are not present in the channels of Pre - SB aircraft. (a) Mark two locations 3.00 inches aft of the forward - most existing holes in the harness cap ( 10 ) as shown. This location must be in - line with the existing row of holes. (b) Identify the existing holes 8.50 inches apart in the harness cap (10 )

. Mark two locations 3.00 aft of the forward - most of these two holes as show. The location must be in - line with the existing row of holes. (c) Drill 0.190 inch holes at the locations marked. Holes pass through the harness cap ( 10 ), the liner panels ( 6 ) and the channel behind the liner panels. On aircraft fitted with harness cap CRJLA11 - 03 or - 07 ( Pre - SB ) Refer to Figure 10 (Sheet 1) on Page 86 :

Backdrill the right - hand lower harness cap ( 7 ) as follows: (39) (a) Mark the center of the holes in the flanges (8) and (9)

. (b) At the center of each hole, drill though the harness cap (7) with a drill of diameter 0.190 inch.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 19 of 92 On aircraft fitted with harness cap CRJLA021 - 003 or - 007 ( Pre - SB )

Backdrill the right - hand upper harness cap (10) as follows: (40) (a) Mark the center of the holes in the flanges (11) and (12). (b) At the center of each hole, drill though the harness cap (10) with a drill of diameter 0.190 inch. On aircraft fitted with harness cap CRJLA021 - 00 3 or - 007 ( Pre - SB ) Refer to Figure 10 (Sheet 2) on Page 87 :

Backdrill the right - hand upper harness cap (5 ) as follows: (41) (a) Mark the cente r of the holes in the flanges (6 ). (b) At the center of each hole, drill through the harness cap (5) with a drill of diameter 0.190 inch. On aircraft fitted with tie rod cap CRJLA039 - 001 ( Pre - SB ) Refer to Figure 11 (Sheet 1) on Page 89 :

Backdrill the lower right - hand tie rod cap (5 ) as follows: (42) (a) Mark the center of the holes in the flanges (7). (b) At the center of each hole, drill through the tie rod cap (5) with a drill of diameter 0.190 inch. On aircraft fitted with tie rod cap CRJLA049 - 001 ( Pre - SB ) or CRJLA048 - 001 ( Pre SB ) Refer to Figure 11 (Sheet 1) on Page 89 :

Backdrill the upper right - hand tie rod cap (6 ) as follows: (43) (a) Mark the center of the holes in the flanges (8). (b) At the center of each hole, drill through the tie rod cap (6) with a drill of diameter 0.190 inch.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 20 of 92 On aircraft fitted with tie rod cap CRJLA050 - 001 ( Pre - SB ) Refer to Figure 11 (Sheet 2) on Page 90 :

Backdrill the lower left - hand tie rod cap (5) as follows: (44) (a) Mark the center of the holes in the flange (6). (b) At the center of each hole, drill through the tie rod cap (5) with a drill of diamet er 0.190 inch. On all aircraft Refer to Figure 10 (Sheet 3) on Page 88 :

Add two holes to the left - hand lower harness cap (7) and channel as (45) follows: Note: H arness cap CRJLA 242 - 003 ha s these holes pre - drilled. Note that the channels still need to be drilled. (a) Mark two locations in the center of 10.00 inch fastener pi tch in the harness cap (7). This location must be in - line with the existing row of holes. (b) Drill 0.190 inch holes at the locations marked. Holes pass through the harness cap ( 7 ), the liner panels ( 5 ) and the channel behind the liner panels. Add four holes t o the left - hand upper harness cap (8) and channel as (46) follows: Note: H arness cap CRJLA240 - 003 ha s these holes pre - drilled. Note that the channels still need to be drilled. (a) Identify the fasteners located 8.70 inches apart. Mark a location 4.35 aft of the forward hole as shown. This location must be in - line with the existing row of holes. (b) Identify the fasteners located 8.24 inches apart. Mark a location 4.12 forward of the aft hole as shown. This location must be in - line with the existing row of hole s.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 21 of 92

(c) Identify the fasteners located 5.03 inches apart. Mark a location 4.72 inches ahead of the forward hole as shown. This location must be in line with the exiting row of holes. (d) Identify the fasteners located 10.00 inches apart. Mark a location 3.00 inches forward of the aft hole as shown. This location must be in - line with the existing row of holes. (e) Drill 0.190 inch holes at the locations marked. Holes pass through the harness cap (8), the liner panels and the channel behind the liner panels. On aircraft f itted with harness cap CRJLA047 - 003 or - 007 or - 015 ( Pre - SB ) Refer to Figure 10 (Sheet 3) on Page 88 :

Backdrill the harness cap (8) as follows: (47) (a) Mark the center of the holes in the flange ( 8). (b) At the center of each hole, drill through the harness cap (8) with a drill of diameter 0.190 inch. On aircraft fitted with harness cap CRJLA043 - 003 ( Pre - SB ) Refer to Figure 10 (Sheet 3) on Page 88 :

Backdrill the harness cap (7) as follows: (48) (a) Mark the center of the holes in the flange ( 7). (b) At the center of each hole, drill through the harness cap (7) with a drill of diameter 0.190 inch. Refer to Figure 9 (Sheet 1) on Page 85 :

Backdrill the floor panels through the holes in kickplates (4) and (5). Hole (49) diameter to be 0.190”. Drill through top skin of floor only. NOTE: Be careful not to damage bottom facing o f the floor panel.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 22 of 92 Refer to Figure 5 (Sheet 1) on Page 77 :

If installed, r emove the harness cap flanges (5) and (7). (50) Refer to Figure 5 (Sheet 2) on Page 78 :

If installed, r emove the harness cap flanges (5) and (7). (51) Refer to Figure 4 (Sheet 1) on Page 7 5 :

If installed, r emove the tie r od cap flanges ( 8) and (9). (52) If installed, r emove the tie rod caps (6) and (7). (53) Refer to Figure 3 (Sheet 1) on Page 72 :

Remove the angles (6), (7), (8) and (9). (54) Refer to Figure 3 (Sheet 3) on Page 74 :

Remove the angles (6) and (7). (55) Refer to Figure 2 (Sheet 7) on Page 67 :

Remove the right - hand upper harness cap (5). (56) Remove the right - hand ceiling panel (4). (57) Refer to Figure 2 (Sheet 4) on Page 64 :

Remove the right - hand lower harness cap (6). (58) Remove the right - hand sidewall panels (4) and (5). (59) Refer to Figure 5 (Sheet 3) on Page 79 :

If installed, remove harness cap flange (5). (60) Refer to Figure 5 (Sheet 3) on Page 79 :

If installed, remove the harness cap flange (7). (61)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 23 of 92 Refer to Figure 2 (Sheet 8) on Page 68 :

Remove the left - hand upper harness cap (5) (62) Remove the left - hand ceiling panel (4) (63) Refer to Figure 2 (Sheet 6) on Page 66 :

Remove the left - hand lower harness cap (5). (64) Remove the left - hand upper sidewall panel (5) and left - hand lower (65) sidewall panel (4). Refer to Figure 2 (Sheet 2) on Page 62 :

Remove the forward liner panel s (4), (5) and (6). (66) Refer to Figure 2 (Sheet 3) on Page 63 :

Remove joi nt overlaps (8) and (9) , kickplates (10) and (11) and the aft wall (67) panels (5), (6) and (7). Refer to Figure 6 (Sheet 1) on Page 80 :

On the forward bulkhead, install inserts ( 3 ) in the locations that were (68) backdrilled as follows: (a) Open the holes backdrilled earlier to a diameter of 0. 686 - 0.691 in. and 0.48” deep with an appropriate hole saw or equivalent cutter. NOTE: Be careful not to damage opposite face skin. (b) Undercut cor e a minimum of 3/16 inch. (c) Remove all loose debris using a vacuum cleaner or dry compressed air. (d) Clean the inserts ( 3 ) by solvent washing or a similar method. Once cleaned, handle only with clean gloves and do not allow contact with dirty or oily surfaces. (e) If desired, apply an adhesive backed tab to the insert to aid in installation.Service Bulletin COMSB - 25 - 52 - 001

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(f) Place the inserts ( 3 ) into the holes in forward bulkhead. Orie nt the inserts with the potting holes aligned vertically. (g) Mix Magnobond 74 - 3 according to the manufacturer’s mixing instructions. Do not mix more than can be used within the pot life of the adhesive. (h) Slowly inject Magnobond 74 - 3 into the lower potting hole of each insert. Stop injecting when adhesive starts to come out of the upper hole. (i) Allow Magnobond 74 - 3 to cure according to manufacturer’s instructions. (j) Remove the all protruding adhesive from the surface. Take care not to damage the insert or bulkhead. Remove the tab, if it was used. (k) Using a permanent ink pen or equivalent, c learly mark the modified bulkhead with the following: “Modified per Service Bulletin COMSB - 25 - 52 - 001 , Rev A ” Refer to Figure 9 (Sheet 1) on Page 85 :

Install inserts in the floor panels as follows : (69) (a) Open the holes backdrilled earlier to a diameter of 0.686 - 0.691 in. and 0.48” deep with an appropriate hole saw or equivalent cutter. NOTE: Be careful not to damage opposite face skin. (b) Undercut core a minimum of 3/16 inch. (c) Remove all loose debris using a vacuum cleaner or dry compressed air. (d) C lean the inserts (3) by solvent washing or a similar method. Once cleaned, handle only with clean gloves and do not allow contact with dirty or oily surfaces. (e) If desired, apply an adhesive backed tab to the insert to aid in installation.Service Bulletin COMSB - 25 - 52 - 001

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(f) Place the inserts (3) into the holes in the floor panels. (g) Mix Magnobond 74 - 3 according to the manufacturer’s mixing instructions. Do not mix more than can be used within the pot life of the adhesive. (h) Slowly inject Magnobond 74 - 3 into one potting hole of each insert. Stop injecting when adhesive starts to come out of the upper hole. (i) Allow Magnobond 74 - 3 to cure according to manufacturer’s instructions. (j) Remove the all protruding adhesive from the surface. Take care not to dama ge the insert or bulkhead. Remove the tab, if it was used. (k) Re - identify the floor panels by appending the part number with:

- COM011 (l) Using a permanent ink pen or equivalent, c learly mark the modified floor panels with the following: “Modified per Service Bul letin COMSB -

25 - 52 - 001 , Rev A ” On aircraft fitted with right - hand lower sidewall panel CRJLA03 - 03 or - 07 or - 11 or

- 15 ( Pre - SB ) or CRJLA015 - 003 or - 007 ( Pre - SB ) Refer to Figure 7 (Sheet 1) on Page 81 :

Install nutplate (1 ) on right - hand lower sidewall panel (5 ) as follows: (70) (a) Using either a nutplate ( 1 ) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the right - hand sidewall (5) earlier to a diameter of 0. 2 50 - 0.260 in. (c) Install nutp lates with rivets (2 ) in the right - hand lower sidewall panel

. (d) Using a permanent ink pen or equivalent, identify the right - hand lower sidewall panel (5 ) a ccording to the following table:Service Bulletin COMSB - 25 - 52 - 001

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Pre - SB Part Number Post - SB Part Number CRJLA03 - 03 CRJLA101 - 003 CRJLA03 - 07 CRJLA101 - 007 CRJLA03 - 11 CRJLA101 - 011 CRJLA03 - 15 CRJLA101 - 015 CRJLA015 - 007 CRJLA101 - 019 CRJLA015 - 003 CRJLA101 - 023 On aircraft fitted with right - hand upper sidewall panel CRJLA023 - 003 or - 007 ( Pre SB ) Refer to Figure 7 (Sheet 2) on Page 82 :

Install nutplate ( 1 ) on right - hand upper sidewall panel ( 5 ) as follows: (71) (a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the sidewa ll (5) earl ier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the right - hand lower sidewall panel. (d) Using a permanent ink pen or equivalent, identify the right - hand upper sidewall panel (5) according to the following table: Pre - SB Par t Number Post - SB Part Number CRJLA023 - 003 CRJLA106 - 003 CRJLA023 - 007 CRJLA106 - 007 On aircraft fitted with right - hand aft wall panel CRJLA017 - 003 ( Pre - SB ) Refer to Figure 8 (Sheet 1) on Page 83 :

Install nutplate (1 ) on t he right - hand aft wall panel (5 ) as follows: (72)Service Bulletin COMSB - 25 - 52 - 001

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(a) Using either a n utplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets (2) for the nutplates. (b) Open the holes that were drilled in the aft - wall liner (5) ear lier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the right - hand lower sidewall panel (5)

. (d) Using a permanent ink pen or equivalent, identify the right - hand aft wall liner (5) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA017 - 003 CRJLA180 - 003 On aircraft fitted with center aft wall panel CRJLA07 - 03 ( Pre - SB ) Refer to Figure 8 (Sheet 1) on Page 83 :

Install nutplate (1) on the center aft wall panel (6) as follows: (73) (a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the aft - wall liner (6) earlier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the center aft wall panel. (d) Using a permanent ink pen or equivalent, identify the center aft wall liner (6) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA07 - 03 CRJLA181 - 007Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 28 of 92 On aircraft fitted with left - hand aft wall panel CRJLA019 - 003 ( Pre - SB ) Refer to Figure 8 (Sheet 2) on Page 84 :

Install nutplate (1) on the left - hand aft wall panel (17) as follows: (74) (a) Using either a n utplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the aft - wall liner (17) ear lier to a diameter of 0.250 - 0.2 60 in. (c) Install nutplates with rivets (2) in the left - hand lower sidewall panel. (d) Using a permanent ink pen or equivalent, identify the left - hand aft wall liner (17) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA019 - 003 CRJLA182 - 011 On aircraft fitted with harness cap CRJLA11 - 03 or - 07 ( Pre - SB ) Refer to Figure 10 (Sheet 1) on Page 86 :

Install nutplate s (1) in the ends of the harness cap (7) as follows: (75) Note: This instruction applies only to the holes that were backdrilled

through the harness cap flanges (8) and (9)

. (a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the harness cap (7) earlier to a diameter of 0. 250 - 0.260 in. (c) Install nutplates with rivets (2) in the harness cap.Service Bulletin COMSB - 25 - 52 - 001

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(d) Using a permanent ink pen or equivalent, identify the harness cap (7) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA11 - 03 CRJLA105 - 003 CRJLA11 - 07 CRJLA105 - 011

On aircraft fitted with harness cap CRJLA021 - 003 or - 007 ( Pre - SB ) Refer to Figure 10 (Sheet 1) on Page 86 :

Install nutplates (1) in the ends of the harness cap (10) as follows: (76) Note: This instruction applies only to the holes that were backdrilled

through the harness cap flanges (11) and (12). (a) Us ing either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the harness cap (10) earlier to a diameter o f 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the harness cap. (d) Using a permanent ink pen or equivalent, identify the harness cap (10) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA021 - 0 0 3 CRJLA107 - 003 CRJLA021 - 0 0 7 CRJLA107 - 007Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 30 of 92 On all aircraft Refer to Figure 10 (Sheet 1) on Page 86 :

Install nutplates (1) in the channels as follows: (77) Note: This instruction applies to the holes drilled in the channels during

steps (37) and (38)

. (a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the channel s earlier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the channel. (d) Re - identif y the channels by appending the part number with:

- COM011 (e) Using a permanent ink pen or equivalent , c learly mark the modified channels with the following: “Modified per Service Bulletin COMSB - 25 - 52 - 001 , Rev A ” Refer to Figure 10 (Sheet 3) on Page 88 :

Install nutplates (1) in the channels as follows: (78) Note: This instruction applies to th e holes drilled in the channels during

steps (45) and (46)

. (a) Using eith er a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the channels earlier to a diameter of 0.250 - 0.260 in

. (c) Install nutplates with rivets (2) in the channel.Service Bulletin COMSB - 25 - 52 - 001

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(d) Re - identify the channels by appending the part number with:

- COM011 (e) Using a permanent ink pen or equivalent , c learly mark the modified channels with the following: “Modified per Service Bulletin COMSB - 25 - 52 - 001 , Rev A ” On aircraft fitted with harness cap CRJLA021 - 003 or - 007 ( Pre - SB ) Refer to Figure 10 (Sheet 2) on Page 87 :

Install nutplate (1) in the harness cap (5) as follows: (79) (a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates . Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the harness cap (5) earlier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the harness cap. (d) Using a permanent ink pen or equiva lent, identify the harness cap (5) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA021 - 003 CRJLA107 - 003 CRJLA021 - 007 CRJLA107 - 007 On aircraft fitted with harness cap CRJLA043 - 003 ( Pre - SB ) Refer to Figure 10 (Sheet 3) on Page 88 :

Install nutplate (1) in the harness ca p (7) as follows: (80) Note: This instruction applies to the holes drilled in step (48)Service Bulletin COMSB - 25 - 52 - 001

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(a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets u sed to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the harness cap (7) earlier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the harness cap. (d) Using a permanent ink pen or equivalent, identify the harness cap (7) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA043 - 003 CRJLA141 - 003

On aircraft fitted with harness cap CRJLA047 - 003 or - 007 or - 015 ( Pre - SB ) Refer to Figure 10 (Sheet 3) on Page 88 :

Install nutplate (1) in the harness cap (8) as follows: (81) Note: This instruction applies to the holes drilled in step (47) (a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the harness cap (8) earlier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the harness cap. (d) Using a permanent ink pen or equivalent, identify the harness cap (8) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA047 - 003 CRJLA140 - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 33 of 92 CRJLA047 - 007 CRJLA140 - 007 CRJLA047 - 015 CRJLA140 - 013 On aircraf t fitted with tie rod cap CRJLA039 - 001 ( Pre - SB ) or CJRLA051 - 001 ( Pre SB ) Refer to Figure 11 (Sheet 1) on Page 89 :

Install nutplate s (1) in the tie rod cap (5) as follows: (82) (a) Using either a nutplate (1) o r a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the tie rod cap (5) earlier to a diameter of 0.250 - 0.260 in. (c) Install nu tplates with rivets (2) in the tie rod cap. (d) Using a permanent ink pen or equivalent, identify the tie rod cap (5) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA039 - 001 CRJLA103 - 001 On aircraft fitted with tie rod cap CRJLA049 - 001 ( Pre - SB ) or CRJLA048 - 001 ( Pre SB ) Refer to Figure 11 (Sheet 1) on Page 89 :

Install nu tplate s (1) in the tie rod cap (6 ) as follows: (83) (a) Using either a nutplate (1) o r a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the tie rod cap ( 6 ) earlier to a diameter of 0.250 - 0.260 in.Service Bulletin COMSB - 25 - 52 - 001

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(c) Install nu tplates with rivets (2) in the tie rod cap. (d) Using a permanent ink pen or equivalent, identify the tie rod cap ( 6 ) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA049 - 001 CRJLA104 - 001 CRJLA048 - 001 CRJLA104 - 003 On aircraft fitted with tie rod cap CRJLA050 - 001 ( Pre - SB ) Refer to Figure 11 (Sheet 2) on Page 90 :

Install nutplate s (1) in the tie rod cap (5) as follows: (84) (a) Using either a nutplate (1) or a nutplate jig, locate the holes for the rivets used to install the nutplates. Drill and countersink #40 holes to accept rivets for the nutplates. (b) Open the holes that were drilled in the tie rod cap (5) earlier to a diameter of 0.250 - 0.260 in. (c) Install nutplates with rivets (2) in the tie rod cap. (d) Add two new slots in the tie rod cap as shown. (e) Using a permanent ink pen or equivalent, identify the tie rod c ap (5) according to the following table: Pre - SB Part Number Post - SB Part Number CRJLA050 - 001 CRJLA142 - 001 On aircraft fitted with access panel CRJLA05 - 03 ( Pre - SB ) or CRJLA031 - 003 ( Pre SB ) Refer to Figure 12 (Sheet 1) on Page 91 :Service Bulletin COMSB - 25 - 52 - 001

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Modify the access panel (1) according to this step OR step (86) : (85) (a) Mark the outline of all foam tape installed on the backside of the access panel (1) using a felt marker or similar (b) Remove the foam tape from the access panel. Ensure that all adhesive residue has been completely removed. NOTE: Use only non - metallic scrapers when removing foam tape. Metal scrapers or other sharp tools may damage the panel. (c) Remove one rivets (3) from each end of each row of rivets on the access panel (1). (d) Apply P - 629 sea m tape over each joint between a stainless steel component and an FML panel. Seam tape must be 3 inches wide. (e) Make a hole in the seam tape at the hole where a rivet was removed to allow re - installation of the rivet. (f) Wet install rivets (3) in the original h oles using RTV106. (g) Apply foam tape (4) in the same location as the original foam tape. Use the marked outlines as a guide. (h) Using a permanent ink pen or equivalent , c learly mark the modified access panel (1) with the following: “Modified per Service Bulletin COMSB - 25 - 52 - 001 Rev A ” Modify the a ccess panel (1) according to this step OR step (85) : (86) (a) Mark the outline of all foam tape installed on the backside of the access panel (1) using a felt marker or similar (b) Remove the foam tape from the access panel. Ensure that all adhesive residu e has been completely removed. NOTE: Use only non - metallic scrapers when removing foam tape. Metal scrapers or other sharp tools may damage the panel. (c) Remove all rivets (3) from the access panel (1)

.Service Bulletin COMSB - 25 - 52 - 001

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(d) Remove all fay - sealant between the three components that make up (1)

. (e) Clean all mating surfaces using acetone or methyl - ethyl - keytone. (f) Fay seal using RTV106 on all mating surfaces. (g) Wet install rivets (3) using RTV106. Install a washer ( 2 ) on the back side of all rivets before squeezing. (h) Apply fillet of RTV1 06 around perimeter of joint. Fillet is only required on side facing the interior of the cargo compartment. (i) Allow sealant to cure. (j) Apply foam tape (4) in the same location as the original foam tape. Use the marked outlines as a guide. (k) Using a permanent ink pen or equivalent, identify the access panel ( 1 ) according to the following table. Pre - SB Part Number Post - SB Part Number CRJLA05 - 03 CRJLA102 - 003 CRJLA031 - 003 CRJLA102 - 007 On all aircraft Refer to Figure 2 (Sheet 2) on Page 62 :

Install the forward liner panel s (4) and (5) using washers (1) and screws (87) (2). Install the center forward liner panel (6) using washers (1) and screws (2) (88) and (3). Install the forward wall access panel (7) using washers (1) and screws (3). (89) Refer to Figure 2 (Sheet 3) :Service Bulletin COMSB - 25 - 52 - 001

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Install the right - hand aft wall panel (5) using screws (2) and washers (1). (90) Do not install fasteners in the holes that will be used to affix corner angles or joint overlaps. Install the left - hand aft wall panel ( 6 ) using screws (2) and washers (1). Do (91) not install fasteners in the holes that will be used to affix corner angles or joint overlaps. Install the cen ter aft wall panel (7) and joint overlaps (8) and (9). Use (92) washers (1) and screws (3) to pass through the joint overlaps and cente r panel into the aircraft structure. Do not install fasteners that pass through the joint overlaps and right - hand aft wall panel or left - hand aft wall panel. Install the left - hand aft wall kickplate (10). Use washers (1) and screws (2) (93) to attach to the aft wall liner. Use washers (1) and screws (4) to attach to the floor. Install the right - hand aft wall kickplate (11). Use washers (1) and screws (94) (2) to attach to the aft wall liner. Use washers (1) and screws (4) to attach to the floor. Refer to Figure 2 (Sheet 4) on Page 64 :

Install the l ower right - hand sidewall pa nel (4) as follows: (95) (a) Position the liner panel in the aircraft. (b) Affix liner panel in place using screws (2) and washers (1)

. NOTE: Do not install fasteners along upper edge where harness cap is installed or along forward or aft edges where angles are installed. (c) Affix the liner panel to the floor using screws ( 2 ) and washers (1). Install the u pper right - hand sidewall panel (5) as follows: (96) (a) Position the liner panel in the aircraft. (b) Temporarily a ffix upper ed ge using 2 to 3 fasteners or as required. Install the lower right - hand harness cap (6) as follows: (97)Service Bulletin COMSB - 25 - 52 - 001

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(a) Position the harness cap in the aircraft. (b) Affix harness cap using screws ( 3 ) and washers (1). Screws pass through harness cap (6), sidewall panels (4) and (5 ) and into aircraft structure. (c) Fillet seal edges of the harness cap (6) using RTV - 106 sealant. Refer to Figure 2 (Sheet 5) on Page 65 :

Install access panel (4) as follows: (98) (a) Position the access panel in the aircraft. (b) Affix access panel using washers (1) and screws (2) and (3). (c) Fillet seal around the edge of the access panel (4) using RTV - 106 sealant. Refer to Figure 2 (Sheet 6) on Pa ge 66 :

Install the left - hand lower sidewall panel (4) as follows: (99) (a) Position the sidewall panel in the aircraft. (b) Affix the access panel using washers (1) and screws (2). NOTE: Do not install fasteners along upper edge where harness cap is installed or along forward or aft edges where angles are installed. Install the left - hand upper sidewall panel (5) as follows: (100) (a) Position the panel in the aircraft. (b) Temporarily affix upper edge using 2 to 3 fasteners or as required. Install t he left - hand lower harness cap (6) as follows: (101) (a) Position the harness cap (6) in the aircraft.Service Bulletin COMSB - 25 - 52 - 001

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(b) Affix harness cap (6) using screws (3) and washers (1). Screws pass through harness cap (6), sidewall pa nels (4) and (5) and into aircraft structure. (c) Fillet seal the edges of the harness cap (6) using RTV - 106 sealant. Refer to Figure 2 (Sheet 7) on Page 67 :

Install the right - hand ceiling panel (4) as follows: (102) (a) Position the panel in the aircraf t. (b) Affix the panel using screws (2) and washers (1). NOTE: Do not install fasteners along the lower edge where the harness cap attaches. Also, do not install fasteners along the forward or aft edges where the corner angles are installed. Install the upper right - hand harness cap (5) as follows: (103) (a) Remove the fasteners used to temporarily attach the upper edge of the upper sidewall panel. (b) Position the harness cap (5) in the aircraft. (c) Affix the harness cap using screws (3) and washers (1). Screws should pass thro ugh the harness cap, through the liner panels and into the aircraft structure. (d) Fillet seal the edges of the harness cap (6) using RTV - 106 sealant. Fillet seal between the ceiling panel (4) and the ceiling center splice using (104) RTV - 106 sealant. Refer to Figure 2 (Sheet 8) on Page 67 :

Insta ll the left - hand ceiling panel (4) usin g washers (1) and screws (2). Do (105) not install fasteners in the bottom row of holes. Fillet seal between the ceiling panel (4) and the ceiling center splice using (106) RTV - 106 sealant.Service Bulletin COMSB - 25 - 52 - 001

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Install t he upper left - hand harness cap (5) as follows: (107) (a) Position the harness cap in the aircraft. (b) Affix the harness cap using washers (1) and screws (3). Screws should pass through the harness cap, through the liner panels and into the aircraft structure. (c) Fillet seal the edges of the harness cap (5) using RTV - 106 sealant. Refer to Figure 2 (Sheet 10) on Page 70 :

Install the protective barriers (4), ( 5), (6) and ( 8 ) using washers (1) and (108) screws (2)

. Install the aft wall extension ( 7 ) using washers (1) and screws (3). (109) Fillet seal the edges of the protective barriers (4), (5) , (6) and (8) and the (110) aft wall extension (7) using RTV - 106 sealant. Refer to Figur e 2 (Sheet 11) on Page 71 :

Install the forward above door liner panel ( 4) using washers (1) and (111) screws (2 ). Do not fasten the forward or top edges of the panel. I nstall the aft above door liner panel (5) using wa shers (1) and screws (2). (112) Do not fasten the aft or top edges of the panel. Fillet seal the joint between the abov e door liner panels (4) and (5) using (113) RTV - 106 sealant. Position the door shroud (6) over the above door liner panels (4) and (5) in (114) the aircraft. Install the door shroud (6) using washers (1) and screws (3). (115) Fillet seal the perimeter of the above door liner panels (4) and (5) and the (116) door shroud using RTV - 106 sealant. Refer to Figure 3 (Sheet 1) on Page 72 :

Attach the angles (4), (5) and (6) using washers (1) and screws (2). (117)Service Bulletin COMSB - 25 - 52 - 001

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Attach the angles (7), (8) and (9) using washers (1) and screws (3). (118) Fillet seal the edges of the angles (4), (5), (6), (7), (8) and (9) using RTV (119) 106 sealant. Refer to Figure 3 (Sheet 2) on Page 73 :

Attach the angles (3), (4), (5), (6), (7) and (8) using washers (1) and (120) screws (2). Fillet seal the edges of the angles (3), (4), (5), (6), (7) and (8) using RTV (121) 106 sealant. Refer to Figure 3 (Sheet 3) on Page 74 :

Attach the angles (4), (5) and (6) using washers (1) and screws (2). (122) Attach the angle (7) using washers (1) and screws (3). (123) Fillet seal the edges of the angles (4), (5), (6) and (7) using RTV - 106 (124) paste sealant. Refer to Figure 4 (Sheet 1) on Page 75 :

Attach the tie rod caps (4) and (5) using screws (3) and washers (1). (125) Attach the tie rod caps (6) and (7) using washers (1) and screws (2). (126) Fillet seal the edges of the tie rod caps (4) , (5 ), (6) and (7) using RTV - 106 (127) sealant. On aircraft fitted wi th tie rod cap CRJLA104 - 001 or - 003 ( Post - SB )

Attach the tie rod cap flange (8) using washers (1) and screws (3). (128) Fillet seal the edges of the tie rod cap flanges (8) usi ng RTV - 106 sealant. (129) On aircraft f itted with tie rod cap CRJLA103 - 001 ( Post - SB )

Attach the tie rod cap flange (9) using washers (1) and screws (3). (130) Fillet seal the edges of the tie rod cap flanges (9) using RTV - 106 sealant. (131)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 42 of 92 On aircraft fitted with tie rod c ap CRJLA104 - 003 ( Post - SB ) Refer to Figure 4 (Sheet 1) on Page 75 :

Apply P - 629 seam tape as follows: (132) (a) Remove the two screws at the ends of one flange of the tie rod cap CRJLA104 - 003 (6). (b) Apply seam tape over the joint between the liner and the flange w ith the screws removed. Seam tape must be 3 inches wide. (c) Make a hole in the seam tape at the locations of the removed screws. (d) Reinstall removed screws. (e) Repeat this procedure for all remaining flanges of CRJLA104 - 003 (6). On aircraft fitted with harness cap CRJLA 105 - 003 or - 011 ( Post - SB ) Refer to Figure 5 (Sheet 1) on Page 77 :

Install the harness cap flanges (5). Use washers (1) and screws (2) to (133) attach the flanges (5) to the harness caps (4). Use washers (1) and screws (3) to attach the fl anges (5) to the angles and panels. Fillet seal the edges of the harness cap flange (5) using RTV - 106 sealant. (134) On aircraft fitted with harness cap CRJLA107 - 003 or - 007 ( Post - SB ) Refer to Figure 5 (Sheet 1) on Page 77 :

Install the harness cap flanges (7). Use washers (1) and screws (2) to (135) attach the flanges (7) to the harness caps (6). Use washers (1) and screws (3) to attach the flanges (7) to the angles and panels. Fillet seal the edges of the harness cap flange (7) using RTV - 106 sealant. (136)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 43 of 92 On aircraft fitted with harness cap CRJLA105 - 003 or - 011 ( Post - SB ) Refer to Figure 5 (Sheet 2) on Page 78 :

Install the harness cap flanges (5). Use washers (1) and screws (2) to (137) attach the flanges (5) to the harness caps (4). Use washers (1) and screws (3) to attach the flanges (5) to the angles and panels. Fillet seal the edges of the harness cap flange (5) using RTV - 106 sealant. (138) On aircraft fitted with harness cap CRJLA107 - 003 or - 007 ( Post - SB ) Refer to Figure 5 (Sheet 2) on Page 78 :

Install the harness cap flanges (7). Use washers (1) and screws (2) to (139) a ttach the flanges (7) to the harness caps (6). Use washers (1) and screws (3) to attach the flanges (7) to the angles and panels. Fillet seal the edges of the harness cap flange (7) using RTV - 106 sealant. (140) On aircraft fitted with harness cap CRJLA141 - 003 ( Post - SB ) Refer to Figure 5 (Sheet 3) on Page 79 :

Install the harness ca p flanges (5). Use washers (1) and screws (2) to (141) attach the flanges (5) to the harness caps (4). Use washers (1) and screws (3) to attach the flanges (5) to the angles and panels. Fillet seal the edges of the harness cap flange (5) using RTV - 106 sealant. (142) O n aircraft fitted with harness cap CRJLA140 - 003 or - 007 or - 013 ( Post - SB ) Refer to Figure 5 (Sheet 3) on Page 79 :

Install the harness cap flanges (7). Use washers (1) and screws (2) to (143) attach the flanges (7) to the harness caps (6). Use washers (1) and screws (3) to attach the flanges (7) to the angles and panels. Fillet sea l the edges of the harness cap flange (7) using RTV - 106 sealant. (144)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 44 of 92 On all aircraft

Install the louvered window cage in the forward bulkhead. (145) Refer to Figure 4 (Sheet 2) on Page 76 :

Attach the tie rod caps (3), (4) and (5) using washers (1) and screws (2). (146) Fillet seal the edges of the tie rod caps (3), (4) and (5) using RTV - 106 (147) sealant. Refer to Figure 2 (Sheet 9) on Page 69 :

Install the duct (4) using screws (3) and washers (1). (148) Install the center aft wall kickplate (5) using screws (2) and washers (1). (149) For aircraft that have a cargo - compartment load divider

Install the end fittings and the cargo restraint netting in the cargo (150) compartment (Refer to AMM 25 - 51 - 01 - 400 - 801). Fillet seal around the end fittings using RTV - 106 sealant. (151) Install the cargo restraint po s ts in the cargo compartment (Refer to AMM (152) 25 - 51 - 01 - 400 - 802). For all aircraft

In stall the cargo smoke detectors (Refer to AMM 26 - 15 - 01 - 400 - 801)

. (153) Fillet seal around the cargo smoke detector using RTV - 106 sealant. (154) Refer to Figure 13 (Sheet 1) on Page 92 :

Install the cargo firex discharge - line using the procedure given in AMM 26 - (155) 25 - 07 - 400 - 8 01 with the following amendments: (a) At FS 614.50, FS603.30, F S595.75 and FS586.29, install the washer (1) and replace the spacer (3) between the ceiling liner and the firex cover.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 45 of 92

(b) At FS611.50 and FS587.79, install the washer (1) and the spacer (2) between the ceiling liner and the clamp that attaches the piccolo tube to the structure. On aircraft that have piccolo tube 601R99011 - 1 or - 9

(c) At FS567.62 , install the washer (1) and replace the spacer (3) between the ceiling liner and the firex cover. (d) At FS569.12, install the washer (1) and the spacer (2) between the ceiling liner and the clamp that attaches the piccolo tube to the structure. (e) At FS577.60, install the washer (1) and the spacer (3) between the ceiling liner and the firex cover. On aircraft that have p iccolo tube 601R99011 - 13

(f) At FS577.60, install the washer (1) and the spacer (2) between the ceiling liner and the clamp that attaches the piccolo tube to the structure. For all aircraft

Install the cargo light with the kept hardware. Refer to AMM 33 - 31 - 01 - 400 - (156) 801. Ap ply a fillet seal of RTV - 106 sealant around the cargo lights. Refer to (157) AMM 51 - 23 - 00 - 390 - 807.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 46 of 92 

### C. Job Close - Out

Remove all tools, equipment and unwanted materials from the cargo (1) compartment. Install all loose items that were removed from the cargo compartment. (2) If removed, install the baggage bay door. (3) (See AMM 52 - 31 - 00 - 400 - 801) If removed, install the Inlet Duct Screen. (4) If removed, install the Exhaust Duct Screen. (5) Perform the adjustment of the cargo compartment door (6) (Refer to AMM 52 - 31 - 00 - 820 - 801) R econnect the electrical systems that were disconnected as part of this (7) service bulletin. Apply external AC power to the aircraft. (8) (Refer to AMM 12 - 00 - 07 - 861 - 801) Perform the operational test of the cargo compartment door (9) (Refer to AMM 52 - 31 - 00 - 710 - 801) Perform the operational test of the cargo compartment door warning (10) system (Refer to AMM 52 - 70 - 02 - 710 - 801) Perform the Operational Test of the Cargo Sm o ke Detection System (11) (Refer to AMM 26 - 15 - 00 - 710 - 801) Perform the Operational Test of the Cargo Lights (12) (Refer to AMM 33 - 31 - 00 - 710 - 801) Perform the Leak Test for the Air Conditioning System (13) (Refer to AMM 21 - 51 - 00 - 790 - 801) Perform the Operational Test of the Cargo Fire - Extinguisher System (14) (Refer to AMM 26 - 25 - 00 - 710 - 801)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 47 of 92

When this service bulletin is completed , make this entry in the applicable (15) logbook(s): Service Bulletin COMSB - 25 - 52 - 001 , Rev A , Equipment/Furnishings

– Cargo Compartment Linings

– Modification and Replacement of Liners in the Cargo Compartment incorporated.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 48 of 92 

### 3. MATERIAL INFORMATION A. Kit Infor mation Contact Comtek Advanced Structures for a complete listing of parts required to complete this Service Bulletin. Comtek Advanced Structures 1360 Artisans Court Burlington, Ontario, L7L 5Y2, Canada Phone: (905) 331 - 8121 Fax: (905) 331 - 8125 

### B. Consumable Information Item Suggested Vendor Notes Non - Solvent based cleaner or detergent Commercial Acetone or Methyl Ethyl Keytone Commercial Nitrile or Latex Disposable Gloves Commercial Masking Tape Commercial Mixing Cups Commercial Must not have wax o r silicone coating on the inner surface. Cups must be resistant to epoxy Stir Sticks Commercial Cotton Wipes Commercial RTV - 106 Sealant E.B. Peerless (905) 362 - 1151 Magnobond 74 - 3 Potting Compound Glotrax (905) 377 - 1441

Magnolia US (800) 831 - 8031 P - 629 Seam Tape, 3” Wide Joli Distrubution (514) 335 - 3172Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 49 of 92 

### C. Special Tools and Equipment Item Suggested Vendor Notes Weighing Scale Commercial 0.1g Accuracy Capacity 200g Hole Saw US Industrial (800) 521 4800 0.686” diameter hole saw (diamond or carbide grit) With 3/16” pilotService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 50 of 92 

### D. Disposition of Parts The following table provides a disposition for each Comtek aftermarket part. To use this table, look up the part number of each part removed from the aircraft. The Disposition Code (DC) shows whether that part will be reworked or discarded. Any relevant no tes are shown in the Notes column (such as other parts affected by a disposition). New parts added by this service bulletin are also shown in this table. Note: This table lists all parts produced by Comtek Advanced Structures. Not all parts will be install ed on any one aircraft. Pre - SB P/N Name Qty DC Post - SB P/N Notes CRJLA03 - 0 1 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 003 Replace CRJLA 039 - 001 with CRJLA203 - 001 R eplace CRJLA049 - 001 with CRJLA204 - 001 CRJLA03 - 03 Sidewall Assy, Lower, RH 1 RWK CRJLA101 - 003 CRJLA03 - 05 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 003 R eplace CRJLA039 - 001 with CRJLA203 - 001 CRJLA03 - 07 Sidewall Assy, Lower, RH 1 RWK CRJLA101 - 007 CRJLA03 - 09 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 003 Replace CRJLA 039 - 001 with CRJLA203 - 001 Replace CRJLA 049 - 001 with CRJLA204 - 001 CRJLA03 - 11 Sidewall Assy, Lower, RH 1 RWK CJRLA101 - 011 CRJLA03 - 13 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 51 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes CRJLA03 - 15 Sidewall Assy, Lower, RH 1 RWK CRJLA101 - 015 CRJLA015 - 005 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 00 3 Replace CRJLA 039 - 001 with CRJLA203 - 001 Replace CRJLA 049 - 001 with CRJLA204 - 001 CRJLA015 - 007 Sidewall Assy, Lower, RH 1 RWK CRJLA101 - 019 CRJLA015 - 001 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 00 3 Replace CRJLA 039 - 001 with CJRLA203 - 001 Replace CRJLA 049 - 005 with CRJLA204 - 001 CRJLA015 - 003 Sidewall Assy, Lower, RH 1 RWK CRJLA101 - 023 CJRLA013 - 001 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 007 CRJLA013 - 003 Sidewall Assy, Lower, RH 1 RWK CRJLA101 - 027 CRJLA013 - 005 Sidewall Assy, Lower, RH 1 DIS CRJLA201 - 007 Replace CRJLA031 - 003 with CRJLA202 - 003 CRJLA013 - 007 Sidewall Assy, Lower, RH 1 RWK CRJLA101 - 031 CRJLA05 - 01 Access Panel, Large, RH 1 DIS CRJLA202 - 003 CRJLA05 - 01 Access Panel, Large, RH 1 RWK CRJLA05 - 01 Apply seam tape and foam tape only CRJLA05 - 03 Access Panel, Large, RH 1 RWK CRJLA102 - 003 CRJLA031 - 001 Access Panel, Small, RH 1 DIS CRJLA202 - 00 5 CRJLA031 - 001 Access Panel, Small, RH 1 RWK CRJLA031 - 001 Apply seam tape and foam tape only CRJLA031 - 003 Access Panel, Small, RH 1 RWK CRJLA102 - 007Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 52 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes CRJLA039 - 001 Cap Assy, Lower, RH 1 RWK CRJLA103 - 001 CRJLA051 - 001 Cap Assy, Lower, RH 1 DIS CRJLA2 03 - 00 1 CRJLA049 - 001 Cap Assy, Upper, RH 1 RWK CRJLA104 - 001 CRJLA048 - 001 Cap Assy, Upper, RH 1 RWK CRJLA104 - 003 CRJLA052 - 001 Cap Assy, Upper, RH 1 RWK CRJLA2 04 - 00 1

- Angle, Aft, Sidewall, RH 1 NEW CRJLA301 - 001

- Angle, Lower, Fwd,

Sidewall, RH 1 NEW CRJLA301 - 003

- Angle, Mid, Fwd, Sidewall, RH 1 NEW CRJLA301 - 005 Install with Sidewall CRJLA101 - 003 or - 007 or - 011 or - 019

- Angle, Mid, Fwd, Sidewall, RH 1 NEW CRJLA301 - 009 Install with Sidewall CJRLA101 - 015 or - 023 or CRJLA202 - 003

- Angle, Mid, Fwd, Sidewall, RH 1 NEW CRJLA301 - 011 Install with Sidewall CRJLA101 - 027 or - 031 or CJRLA202 - 003

- Angle, Upper, Fwd,

Sidewall, RH 1 NEW CRJLA301 - 013

- Cap Flange, Lower,

Sidewall, RH 1 NEW CRJLA302 - 001 Install with C ap CRJLA103 - 001

- Cap Flange, Upper,

Sidewall, RH 1 NEW CRJLA303 - 001 Install with C ap CRJLA104 - 001

- Cap Flange, Upper,

Sidewall, RH 1 NEW CRJLA303 - 003 Install with C ap CRJLA104 - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 53 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes CRJLA11 - 01 Harness Cap, Lower, RH 1 DIS CRJLA205 - 003 CRJLA11 - 03 Harness Cap, Lower, RH 1 RWK CJRLA105 - 003 CRJLA11 - 05 Harness Cap, Lower, RH 1 DIS CRJLA205 - 003 CRJLA11 - 07 Harness Cap, Lower, RH 1 RWK CRJLA105 - 011

- Cap Flange, Lower, RH ,

Fwd 1 NEW CRJLA304 - 001

- Cap Flange, Lower, RH , Aft 1 NEW CRJLA304 - 003 CRJLA023 - 001 Sidewall, Upper, RH 1 DIS CRJLA206 - 003 CRJLA023 - 003 Sidewall, Upper, RH 1 RWK CRJLA106 - 003 CRJLA023 - 005 Sidewall, Upper, RH 1 DIS CRJLA206 - 003 CRJLA023 - 007 Sidewall, Upper, RH 1 RWK CRJLA106 - 007

- Angle, Aft, Upper,

Sidewall , RH 1 NEW CRJLA301 - 015

- Angle, Fwd, Upper

Sidewall, RH 1 NEW CRJLA301 - 017 CRJLA021 - 001 Harness Cap, Upper, RH 1 DIS CRJLA207 - 003 CRJLA021 - 003 Harness Cap, Upper, RH 1 RWK CRJLA107 - 003 CRJLA021 - 005 Harness Cap, Upper, RH 1 DIS CRJLA207 - 003 CRJLA021 - 007 Harness Cap, Upper, RH 1 RWK CRJLA107 - 007Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 54 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes

- Cap Flange, Upper

Harness Cap. RH 2 NEW CRJLA306 - 001

- Panel, Ceiling, RH 1 NEW CRJLA220 - 003

- Panel, Ceiling, RH 1 NEW CRJLA220 - 007

- Panel, Ceiling, RH 1 NEW CRJLA220 - 011

- Angle, Aft, Ceiling, RH 1 NEW CRJLA301 - 023

- Angle, Lwr, Fwd, Ceiling, RH 1 NEW CRJLA301 - 025

- Angle, Upper, Fwd,

Ceiling, RH 1 NEW CRJLA301 - 027 Install with CRJLA220 - 003 or - 007

- Angle, Upper, Fwd,

Ceiling, RH 1 NEW CRJLA301 - 029 Install with CRJLA220 - 011

- Panel, Ceiling, LH 1 NEW CRJLA221 - 003

- Panel, Ceiling, LH 1 NEW CRJLA221 - 007

- Angle, Aft, Ceiling, LH 1 NEW CRJLA301 - 033

- Angle, Lwr, Fwd, Ceiling, LH 1 NEW CRJLA301 - 035 Install with CRJLA221 - 003 or - 007

- Angle, Upr, Ceiling, LH 1 NEW CRJLA301 - 041 Install with CRJLA221 - 003

- Angle, Upr, Ceiling, LH 1 NEW CRJLA301 - 043 Install with CRJLA221 - 007

- Cap Assy, Ceiling, RH 3 NEW CRJLA222 - 001

- Support, Center, Ceiling 1 NEW CRJLA225 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 55 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes CRJLA047 - 001 Harness Cap, Upper, LH 1 DIS CRJLA240 - 003 CRJLA047 - 005 Harness Cap, Upper, L H 1 DIS CRJLA240 - 003 CRJLA0 47 - 003 Harness Cap, Upper, LH 1 RWK CRJLA140 - 003 CRJLA047 - 007 Harness Cap, Upper, LH 1 RWK CRJLA140 - 007 CRJLA047 - 013 Harness Cap, Upper, LH 1 DIS CRJLA240 - 003 CRJLA047 - 015 Harness Cap, Upper, LH 1 RWK CRJLA140 - 013

- Sidewall, Upper, LH 1 NEW CRJLA241 - 003

- Angle, Fwd, Upper

Sidewall, LH 1 NEW CRJLA301 - 045 CRJLA043 - 001 Harness Cap, Lower, LH 1 DIS CRJLA242 - 003 CRJLA043 - 003 Harness Cap, Lower, LH 1 RWK CRJLA141 - 003

- Cap Flange, Upper

Harness Cap, LH 1 NEW CRJLA340 - 001

- Cap Flange, Lower

Harness Cap, LH 1 NEW CRJLA342 - 001

- Sidewall, Lower, LH 1 NEW CRJLA243 - 003

- Angle, Lower, Fwd,

Sidewall, LH 1 NEW CRJLA301 - 049

- Angle, Mid, Fwd, Sidewall, LH 1 NEW CRJLA301 - 053

- Angle, Upper, Fwd,

Sidewall, LH 1 NEW CRJLA301 - 057Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 56 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes CRJLA050 - 001 Cap, Lower, Sidewall, LH 1 RWK CRJLA142 - 001

- Cap, Lower, Sidewall, LH 1 NEW CRJLA244 - 001

- Cap, Upper, Sidewall, LH 1 NEW CRJLA245 - 001

- Cap Flange, Lower

Sidewall, LH 1 NEW CRJLA341 - 001 Install with CRJLA142 - 001 only

- Liner, Above Door (Fwd) 1 NEW CRJLA246 - 001

- Liner, Above Door (Aft) 1 NEW CRJLA247 - 001

- Shroud, Cargo

Compartment 1 NEW CRJLA248 - 001 CRJLA017 - 001 Liner, Aft Wall, RH 1 DIS CRJLA280 - 003 CRJLA017 - 003 Liner, Aft Wall, RH 1 RWK CRJLA180 - 003 CRJLA07 - 01 Liner, Aft Wall, Ctr 1 DIS CRJLA281 - 003 CRJLA07 - 03 Liner, Aft Wall, Ctr 1 RWK CRJLA181 - 00 7

- Joint Overlap, Aft Wall,

Center, RH 1 NEW CRJLA281 - 023

- Joint Overlap, Aft Wall,

Center, LH 1 NEW CRJLA281 - 027 CRJLA019 - 001 Liner, Aft Wall, LH 1 DIS CRJLA282 - 011 CRJLA019 - 003 Liner, Aft Wall, LH 1 RWK CRJLA182 - 011

- Wall Extension, Aft Wall, LH 1 NEW CRJLA282 - 021Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 57 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes CRJLA09 - 01 Duct, Aft Wall, Center 1 DIS CRJLA2 83 - 00 3 CRJLA09 - 07 Duct, Aft Wall, Center 1 RWK CRJLA183 - 007 CRJLA09 - 03 Duct, Aft Wall, Center 1 RWK CRJLA1 83 - 003 CRJLA09 - 05 Duct, Aft Wall, Center 1 DIS CRJLA283 - 001 CRJLA017 - 021 Kickplate, Aft Wall, RH 1 DIS CRJLA380 - 001 CRJLA017 - 023 Kicplate, Aft Wall, RH 1 DIS CRJLA380 - 001 CRJLA09 - 21 Kickplate, Aft Wall, Center 1 DIS CRJLA381 - 001 CRJLA09 - 023 Kickplate, Aft Wall, Center 1 DIS CRJLA381 - 001 CRJLA019 - 021 Kickplate, Aft Wall, LH 1 DIS CRJLA382 - 001 CRJLA019 - 023 Kickplate, Aft Wall, LH 1 DIS CRJLA382 - 001

- Protective Barrier, Aft

Wall, Lower 1 NEW CRJLA284 - 001

- Protective Barrier, Aft

Wall, Upper 1 NEW CRJLA284 - 005

- Protective Barrier, Aft

Wall, Mid Otbd 1 NEW CRJLA284 - 009

- Protective Barrier, Aft

Wall, Mid Inbd 1 NEW CRJLA284 - 013

- Liner, Fwd Wall, RH 1 NEW CRJLA260 - 003

- Liner, Fwd Wall, RH 1 NEW CRJLA260 - 007

- Liner, Fwd Wall, Ctr 1 NEW CRJLA261 - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 58 of 92 Pre - SB P/N Name Qty DC Post - SB P/N Notes

- Liner, Fwd Wall, Ctr 1 NEW CRJLA261 - 007

- Liner, Fwd Wall, LH 1 NEW CRJLA262 - 003

- Liner, Fwd Wall, LH 1 NEW CRJLA262 - 007

- Access Door, Fwd Wall, RH 1 NEW CRJLA263 - 003 Disposition Codes (DC):

 DIS: Discard

 RWK: Rework as shown in this service bulletin

 N EW: New partService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 59 of 92 Figure 1 Pre - SB L iner Removal

Figure 1 (Sheet 1) Pre - SB Liner Rem oval

LEGEND 1. Access door CRJLA05 - 01 or - 03 or CRJLA031 - 001 or - 003 2. Right - hand lower sidewall CRJLA03 - 01 or - 03 or - 05 or - 07 or - 09 or - 11 or - 13 or - 15 or CRJLA015 - 001 or - 003 or - 005 or - 007 or CRJLA013 - 001 or - 003 or - 005 or - 007 3. Right - hand upper sidewall CRJLA023 - 001 or - 003 or - 005 or - 007 or CRJLA025 - 001 or - 003 4. Right - hand lower harness cap CRJLA11 - 01 or - 03 or - 05 or - 07 or CRJLA027 - 001 or - 003 5. Right - hand upper harness cap CRJLA021 - 001 or - 003 or - 005 or - 007 or CRJLA029 - 001 or - 003 6. Right - hand lower tie rod cap CRJLA039 - 001 or CRJLA051 - 001 7. Right - hand upper tie rod cap CRJLA039 - 001 or CRJLA048 - 001 or CRJLA049 - 001 or CRJLA052 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 60 of 92

Figure 1 (Sheet 2) Pre - SB Liner Removal LEGEND 8. Center Aft Wall Kickplate CRJLA09 - 21 or - 023 9. Duct CRJLA09 - 01 or - 03 or - 05 or - 07 10. Right aft wall angle CRJLA017 - 021 or - 023 11. Left aft wall angle CRJLA019 - 021 or - 023 12. Right aft wall CRJLA017 - 001 or - 003 13. Left aft wall CRJLA019 - 001 or - 003 14. Center aft wall CRJLA07 - 01 or - 03Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 61 of 92 Figure 2 Liner Installation

Figure 2 (Sheet 1) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 08 3. Center Ceiling Support CRJLA225 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 62 of 92 Figure 2 (Sheet 2) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 06 3. Screw MS27039 - 1 - 07 4. Left - Hand Forward Wall Liner CRJLA262 - 003 or CRJLA262 - 007 5. Right - Hand Forward Wall Liner CRJLA260 - 003 or CRJLA260 - 007 6. Center Forward Wall Liner CRJLA261 - 003 or CRJLA261 - 007 7. Forward Wall Access Panel CRJLA263 - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 63 of 92 Figure 2 (Sheet 3) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 06 3. Screw MS27039 - 1 - 07 4. Screw MS27039 - 1 - 05 5. Right - Hand Aft Wall CRJLA280 - 003 or CRJLA017 - 003 (Pre - SB) CRJLA180 - 003 (Post - SB) 6. Left - Hand Aft Wall CRJLA282 - 011 or CRJLA019 - 003 (Pre - SB) CRJLA182 - 011 (Post - SB) 7. Center Aft Wall CRJLA281 - 003 or CRJLA07 - 03 (Pre - SB) CRJLA181 - 007 (Post - SB) 8. Joint Overlap, RH CRJLA281 - 023 9. Joint Overlap, LH CRJLA281 - 027 10. Left - Hand Aft Wall Kickplate CRJLA382 - 001 11. Right - Hand Aft Wall Kickplate CRJLA380 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 64 of 92 Figure 2 (Sheet 4) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 06 3. Screw MS27039 - 1 - 09 4. Lower Right - Hand Sidewall Panel CRJLA201 - 003 or - 007 or CRJLA03 - 03 (Pre - SB) CRJLA101 - 003 (Post - SB) or CRJLA03 - 07 (Pre - SB) CRJLA101 - 007 (Post - SB) or CRJLA03 - 11 (Pre - SB) CRJLA101 - 011 (Post - SB) or CRJLA03 - 15 (Pre - SB) CRJLA101 - 015 (Post - SB) or CRJLA015 - 007 (Pre - SB) CRJLA101 - 019 (Post - SB) or CRJLA015 - 003 (Pre - SB) CRJLA101 - 023 (Post - SB) 5. Upper Right - Hand Sidewall Panel CRJLA206 - 003 or - 007 or CRJLA023 - 003 (Pre - SB) CRJLA106 - 003 (Post - SB) or CRJLA023 - 007 (Pre - SB) CRJLA106 - 007 (Post - SB) 6. Lower RH Harness Cap CRJLA205 - 003 or - 007 or CRJLA11 - 03 (Pre - SB) CRJLA105 - 003 (Post - SB) or CRJLA11 - 07 (Pre - SB) CRJLA105 - 011 (Post - SB)

NOTES 1. Temporarily affix upper edge with 2 to 3 screws as required.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 65 of 92 Figure 2 (Sheet 5) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 08 3. Screw MS27039 - 1 - 09 4. Access Panel CRJLA202 - 003 or - 005 or CRJLA05 - 03 (Pre - SB) CRJLA102 - 003 (Post - SB) or CRJLA031 - 003 (Pre - SB) CRJLA102 - 007 (Post - SB)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 66 of 92 Figure 2 (Sheet 6) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 08 3. Screw MS27039 - 1 - 09 4. LH Lower Sidewall CRJLA243 - 001 or - 003 or - 005 or - 007 5. LH Upper Sidewall CRJLA241 - 001 or - 003 or - 005 or - 007 6. Harness Cap CRJLA242 - 003 or CRJLA043 - 003 (Pre - SB) CRJLA141 - 003 (Post - SB)

NOTES 1. Temporarily affix upper edge with 2 to 3 screws as required.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 67 of 92 Figure 2 (Sheet 7) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 08 3. Screw MS27039 - 1 - 09 4. RH Ceiling Panel CRJLA220 - 003 or - 007 or - 011 5. Upper RH Harness Cap CRJLA207 - 003 or CRJLA021 - 003 (Pre - SB) CRJLA107 - 003 (Post - SB) or CRJLA021 - 007 (Pre - SB) CRJLA107 - 007 (Post - SB)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 68 of 92 Figure 2 (Sheet 8) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 08 3. Screw MS27039 - 1 - 09 4. LH Ceiling Panel CRJLA221 - 003 5. Upper LH Harness Cap CRJLA240 - 003 or CRJLA047 - 003 (Pre - SB) CRJLA140 - 003 (Post - SB) or CRJLA047 - 007 (Pre - SB) CRJLA140 - 007 (Post - SB) or CRJLA047 - 015 (Pre - SB) CRJLA140 - 013 (Post - SB)Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 69 of 92 Figure 2 (Sheet 9) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 09 3. Screw MS27039 - 1 - 10 4. Duct CRJLA283 - 001 or - 003 or CRJLA09 - 03 or - 07 (Pre - SB) CRJLA183 - 003 or - 007 (Post - SB) 5. Center Aft Wall Kickplate CRJLA381 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 70 of 92 Figure 2 (Sheet 10) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 09 3. Screw MS27039 - 1 - 09 4. Protective Barrier, Upper CRJLA284 - 005 5. Protective Barrier, Mid, Inbd CRJLA284 - 013 6. Protective Barrier, Mid, Otbd CRJLA284 - 009 7. Aft Wall Extension CRJLA282 - 021 8. Protective Barrier, Lower CRJLA284 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 71 of 92 Figure 2 (Sheet 11) Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 06 3. Screw MS27039 - 1 - 07 4. Forward Above Door Liner CRJLA246 - 001 5. Aft Above Door Liner CRJLA247 - 001 6. Door Shroud CRJLA248 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 72 of 92 Figure 3 Angle Installation

Figure 3 (Sheet 1) Angle Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 07 3. Screw MS27039 - 1 - 07 4. Angle CRJLA301 - 027 or - 029 5. Angle CRJLA301 - 025 6. Angle CRJLA301 - 017 7. Angle CRJLA301 - 013 8. Angle CRJLA301 - 005 or - 009 9. Angle CRJLA301 - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 73 of 92 Figure 3 (Sheet 2) Angle Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 07 3. Angle CRJLA301 - 041 or - 043 4. Angle CRJLA301 - 035 5. Angle CRJLA301 - 045 6. Angle CRJLA301 - 057 7. Angle CRJLA301 - 053 8. Angle CRJLA301 - 049Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 74 of 92 Figure 3 (Sheet 3) Angle Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 07 3. Screw MS27039 - 1 - 08 4. Angle CRJLA301 - 033 5. Angle CRJLA301 - 023 6. Angle CRJLA301 - 015 7. Angle CRJLA301 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 75 of 92 Figure 4 Tie Rod Cap Installation

Figure 4 (Sheet 1) Tie Rod Cap Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 07 3. Screw MS27039 - 1 - 06 4. Ceiling Cap Assy CRJLA222 - 001 5. Ceiling Cap Assy CRJLA222 - 001 6. Right - Hand Upper Sidewall Cap CRJLA204 - 001 or CRJLA049 - 001 (Pre - SB) CRJLA104 - 001 (Post - SB) or CRJLA048 - 001 (Pre - SB) CRJLA104 - 003 (Post - SB) 7. Right - Hand Lower Sidewall Cap CRJLA203 - 001 or CRJLA039 - 001 (Pre - SB) CRJLA103 - 001 (Post - SB) 8. Right - Hand Upper Cap Flange CRJLA303 - 01 or - 003 9. Right - Hand Lower Cap Flange CRJLA302 - 001 10. P - 629 Seam Tape NOTES 1. Item 9 only installed when item 6 is CRJLA103 - 001 2. Item 8 only installed when item 7 is CRJLA104 - 001 or - 003 3. Item 10 installed on with CRJLA104 - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 76 of 92

Figure 4 (Sheet 2) Tie Rod Cap Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 06 3. Ceiling Cap Assy CRJLA222 - 001 4. Left - Hand Upper Cap Assy CRJLA245 - 001 5. Left - Hand Lower Cap Assy CRJLA244 - 001 or CRJLA050 - 001 (Pre - SB) CRJLA142 - 001 (Post - SB) 6. Left - Hand Lower Cap Flange CRJLA341 - 001

NOTES 1. Item 6 only installed when item 5 is CRJLA142 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 77 of 92 Figure 5 Harness Cap Flange Installation

Figure 5 (Sheet 1) Harness Cap Flange Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 07 3. Screw MS27039 - 1 - 08 4. Harness Cap CRJLA205 - 003 or CRJLA11 - 03 (Pre - SB) CRJLA105 - 003 (Post - SB) or CRJLA11 - 07 (Pre - SB) CRJLA105 - 011 (Post - SB) 5. Harness Cap Flange CRJLA304 - 001 6. Harness Cap CRJLA207 - 003 or CRJLA021 - 003 (Pre - SB) CRJLA107 - 003 (Post - SB) or CRJLA021 - 007 (Pre - SB) CRJLA107 - 007 (Post - SB) 7. Harness Cap Flange CRJLA306 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 78 of 92

Figure 5 (Sheet 2) Harness Cap Flange Installation LEGEND 1. Washer NAS1149F0363P 2. Screw MS27039 - 1 - 07 3. Screw MS27039 - 1 - 08 4. Harness Cap CRJLA205 - 003 or CRJLA11 - 03 (Pre - SB) CRJLA105 - 003 (Post - SB) or CRJLA11 - 07 (Pre - SB) CRJLA105 - 011 (Post - SB) 5. Harness Cap Flange CRJLA304 - 003 6. Harness Cap CRJLA207 - 003 or CRJLA021 - 003 (Pre - SB) CRJLA107 - 003 (Post - SB) o r CRJLA021 - 007 (Pre - SB) CRJLA107 - 007 (Post - SB) 7. Harness Cap Flange CRJLA306 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 79 of 92

Figure 5 (Sheet 3) Harness Cap Flange Installation LEGEND 1. Washer NAS1149F0363P 2. Screw (REF) 3. Screw MS27039 - 1 - 09 4. Harness Cap CRJLA242 - 003 or CRJLA043 - 003 (Pre - SB) CRJLA141 - 003 (Post - SB) 5. Harness Cap Flange CRJLA342 - 001 6. Harness Cap CRJLA240 - 003 or CRJLA047 - 003 (Pre - SB) CRJLA140 - 003 (Post - SB) or CRJLA047 - 007 (Pre - SB) CRJLA140 - 007 (Post - SB) or CRJLA047 - 015 (Pre - SB) or CRJLA140 - 013 (Post - SB) 7. Harness Cap Flange CRJLA340 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 80 of 92 Figure 6 Forward Bulkhead Liner Installation

Figure 6 (Sheet 1) Forward Bulkhead Liner Installation LEGEND 1. Washer NAS1149F0363P 2. Screw (REF) 3. Insert NAS1835C3 4. Liner Assy CRJLA262 - 003 or - 007 5. Liner Assy CRJLA261 - 003 or - 007 6. Liner Assy CRJLA260 - 003 or - 007Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 81 of 92 Figure 7 Sidewall Panel – Changes

Figure 7 (Sheet 1) Sidewall Panel – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. Lower Right - Hand Sidewall Panel CRJLA03 - 03 (Pre - SB) CRJLA101 - 003 (Post - SB) or CRJLA03 - 07 (Pre - SB) CRJLA101 - 007 (Post - SB) or CRJLA03 - 11 (Pre - SB) CRJLA101 - 011 (Post - SB) or CRJLA03 - 15 (Pre - SB) CRJLA101 - 015 (Post - SB) or CRJLA015 - 007 (Pre - SB) CRJLA101 - 019 (Post - SB) or CRJLA015 - 003 (Pre - SB) CRJLA101 - 023 (Post - SB) 6. Angle CRJLA301 - 005 or - 007 or - 009 7. Angle CRJLA301 - 003 8. Angle CRJLA301 - 01 3 9. Angle CRJLA301 - 001 NOTES 1. Locate nutplate using backdrilled hole 2. Drill and countersink rivet holes using a template or a nutplate 3. Backdrill sidewall panel in center of slot in angle 4.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 82 of 92

Figure 7 (Sheet 2) Sidewall Panel – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. Upper Right - Hand Sidewall Panel CRJLA023 - 003 (Pre - SB) CRJLA106 - 003 (Post - SB) or CRJLA023 - 007 (Pre - SB) CRJLA106 - 007 (Post - SB) 6. Angle CRJLA301 - 017 7. Angle CRJLA301 - 0 15

NOTES 1. Locate nutplate using backdrilled hole 2. Drill and countersink rivet holes using a template or a nutplate 3. Backdrill sidewall panel in center of slot in angle 4.Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 83 of 92 Figure 8 Aft Wall Panels – Changes

Figure 8 (Sheet 1) Aft Wall Panels – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. RH Aft Wall CRJLA017 - 003 (Pre - SB) CRJLA180 - 003 (Post - SB) 6. Center Aft Wall CRJLA07 - 03 (Pre - SB) CRJLA181 - 003 (Post - SB) 7. RH Center Joint Overlap CRJLA281 - 023 8. Angle CRJLA301 - 023 9. Cap Flange CRJLA306 - 001 10. Angle CRJLA30 1 - 015 11. Cap Flange CRJLA304 - 003 12. Angle CRJLA301 - 001 13. RH Kick Plate CRJLA380 - 001 14. LH Kick Plate CRJLA382 - 001 15. LH Center Joint Overlap CRJLA281 - 027 16. Angle CRJLA301 - 033 NOTES 1. Locate nutplate using backdrilled hole 2. Drill and countersink rivet holes using a template or a nutplateService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 84 of 92

Figure 8 (Sheet 2) Aft Wall Panels – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. RH Aft Wall CRJLA017 - 003 (Pre - SB) CRJLA180 - 003 (Post - SB) 6. Ce nter Aft Wall CRJLA07 - 03 (Pre - SB) CRJLA180 - 003 (Post - SB) 14. LH Kick Plate CRJLA382 - 001 15. LH Center Joint Overlap CRJLA281 - 027 16. Angle CRJLA301 - 033 17. Aft Wall CRJLA019 - 003 (Pre - SB) CRJLA182 - 011 (Post - SB) 18. Wall Extension CRJLA282 - 021

NOTES 1. Locate nutplate using backdrilled hole 2. Drill and countersink rivet holes using a template or a nutplateService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 85 of 92 Figure 9 Floor Panels – Changes

Figure 9 (Sheet 1) Floor Panels – Changes LEGEND 1. Washer NAS1149F0363P 2. Screw (REF) 3. Insert NAS1835C3 4. Kickplate CRJLA382 - 001 5. Kickplate CRJLA380 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 86 of 92 Figure 10 Harness Cap – Changes

`1 Figure 10 (Sheet 1) Harness Cap – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. Lower Right - Hand Sidewall Panel CRJLA201 - 003 or - 007 or CRJLA03 - 03 or - 07 or - 11 or - 15 (Pre SB) CRJLA101 - 003 or - 007 or - 011 or - 015 (Post - SB) or CRJLA015 - 003 or - 007 (Pre - SB) CRJLA101 - 019 or - 023 (Post - SB) 6. Upper Right - Hand Sidewall Panel CRJLA206 - 003 or - 007 or CRJLA023 - 003 or - 007 (Pre - SB) CRJLA106 - 003 or - 007 (Post - SB) 7. Lower Right - Hand Harness Cap CRJLA205 - 003 or - 007 CRJLA11 - 03 or - 07 (Pre - SB) CRJLA105 - 003 or - 011 (Post - SB) 8. Harness Cap Flange CRJLA304 - 001 9. Harness Cap Flange CRJLA304 - 003 10. Upper Right - Hand Harness Cap CRJLA207 - 003 or CRJLA021 - 003 or - 007 (Pre - SB) CRJLA107 - 003 or - 007 (Post - SB) 11. Harness Cap Flange CRJLA306 - 001 12. Harness Cap Flange CJRLA306 - 005 

### C 

### D

A BService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 87 of 92

Figure 10 (Sheet 2) Harness Cap – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. Upper Right - Hand Harness Cap CRJLA021 - 003 (Pre - SB) CRJLA107 - 003 (Post - SB) or CRJLA021 - 007 (Pre - SB) CRJLA107 - 007 (Post - SB) 6. Harness Cap Flange CRJLA306 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 88 of 92

Figure 10 (Sheet 3) Harness Cap - Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. LH Lower Sidewall CRJLA243 - 001 or - 003 or - 005 or - 007 6. LH Upper Sidewall CRJLA241 - 001 or - 003 or - 005 or - 007 7. Harness Cap CRJLA242 - 003 or CRJLA043 - 003 (Pre - SB) CRJLA141 - 003 (Post - SB) 8. CRJLA240 - 003 or CRJLA047 - 003 (Pre - SB) CRJLA140 - 003 (Post - SB) or CRJLA047 - 007 (Pre - SB) CRJLA140 - 007 (Post - SB) or CRJLA047 - 015 (Pre - SB) CRJLA140 - 013 (Post - SB) 9. Harness Cap Flange CRJLA342 - 001 10. Harness Cap Flange CRJLA340 - 001



### A C BService Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 89 of 92 Figure 11 Tie Rod Cap – Changes

Figure 11 (Sheet 1) Tie Rod Cap – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. Lower right - hand tie rod cap CRJLA039 - 001 (Pre - SB) CJRLA103 - 001 (Post - SB) 6. CRJLA049 - 001 (Pre - SB) CRJLA104 - 001 (Post - SB) or CRJLA048 - 001 (Pre - SB) CRJLA104 - 003 (Post - SB) 7. Lower right - hand tie rod cap flange CRJLA302 - 001 8. Upper right - hand tie rod cap flange CRJLA303 - 001 or - 003Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 90 of 92

Figure 11 (Sheet 2) Tie Rod Cap – Changes LEGEND 1. Nutplate MS21075L3N 2. Rivet MS20426AD3 - 3 or CR2672P - 3 - 03 3. Washer NAS1149F0363P 4. Screw (REF) 5. Lower left - hand tie rod cap CRJLA050 - 001 (Pre - SB) CRJLA142 - 001 (Post - SB) 6. Lower left - hand tie rod cap flange CRJLA341 - 001Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 91 of 92 Figure 12 Access Panel – Changes

Figure 12 (Sheet 1) Access Panel – Changes LEGEND 1. Access Panel CRJLA05 - 03 CRJLA102 - 003 (Post - SB) or CRJLA031 - 003 CRJLA102 - 007 (Post - SB) 2. Washer NAS1149CN632R 3. Rivet CR3523 - 4 4. Foam Tape HT - 805(A) 5. P - 629 Seam Tape NOTES 1. Fay - seal between components during assembly 2. Item 5 not installed on CRJLA102 - 003 or - 007Service Bulletin COMSB - 25 - 52 - 001

Revision A COMSB - 25 - 52 - 001 29 December 2011 Page 92 of 92 Figure 13 Piccolo Tube – Installation

Figure 13 (Sheet 1) Piccolo Tube – Installation LEGEND 1. Washer NAS1149CO332R 2. Spacer NAS43DD3 - 9FC 3. Spacer NAS43DD3 - 52N (Pre - SB) NAS43DD3 - 63FC (Post - SB) NOTES 1. On aircraft that have piccolo tube 601R99011 - 1 or - 9 2. On aircraft that have piccolo tube 601R99011 - 13