## DS' CASA CN-235-SERVICEBULLETIN 

### FIRE PROTECTION ENGINE FIRE EXTINGUISHING. MODIFICATION OF THE ENGINE FIRE DETECTION SYSTEM.

1. GENERAL INFORMATION A. EFFECTIVITY (1) Models CN-235-200, CN-235-300. (2) Aircraft The Version/MSN relationship is provided for information only. This relationship is correct at the time of issue in accordance with the information available in EADS-CASA. Any future changes that are a result ofthe transfer of an aircraft from one version to anotherwill not be reflected in this list unless the Service Bulletin is revised for another reason. VERSION AE01 AE02
IB02 L302 L303 QC02 SM01 (3) Spares None MSN C-135. C-139, C-143, C-145. C-018, C-030. 

## c-130. C-176, C-177, C-182, C-186. C-042. C-166, C-169, C-171.

B. CONCURRENT REQUIREMENTS None

Date:Jul 08/2014 Original KIT No. SB235260006K01 SB235260006K01
SB235260006K01 SB235260006K01 SB235260006K01
SB235260006K01 SB235260006K01

SB-235-26-0006 Pag : 1of 38CN-235-SERVICEBULLETIN C. REASON (1) HISTORY The possibility that a false alarm occurs because of damp in the connectors ofthe fire detectors has been found. (2) OBJETIVE I ACTION To modify the location and routing of the fire detection system. (3) ADVANTAGES To prevent false alarm and damp in the connectors of the fire detectors. (4) OPERATIONAL/MAINTENANCE CONSEQUENCE None D. DESCRIPTION To accomplish this Service Bulletin it is necessary to:

- Put the aircraft in the safe condition for maintenance tasks.

- Put the access platform in position.

- Get access to the work area.

- Disconnect the fire detection sensors.

- Remove clamps and supports.

- Remove labels. -Modify firewall.

- Install new clamps and supports.

- Connect the fire detection sensor.

- Set new labels.

- Do tests.

- Install the access panels.

- Record the accomplishment. E. COMPLIANCE (1) Classification Recommended (2) Accomplishment Timescale None F. APPROVAL The technical content ofthis document has been approved by the authority ofthe DOA No. EASA.21J.032.
Date:Jul 08/2014 Original SB-235-26-0006 Pag : 2CN-235-SERVICEBULLETIN NOTE: This issue is atranslation of SB-235-26-0006. In case of any disagreement, reference should be made to the Spanish Original issue, which has been approved by the authority ofthe DOA No. EASA.21J.032. G. MANPOWER The manpower estimates given in this Service Bulletin are based on the direct labour cost to do the work. These estimates assume that the work will be done by experienced personnel, and may need to be revised upwards to suit operators' circumstances. The estimates do not include the time to prepare, plan or inspect the work. Manufacture and procurement ofpart and tools, curing times (drying times for paints, sealants, adhesives, etc.) and general administration work are also not included. Kit SB235260006K01 ON AIRCRAFT: 24
TOTAL MANHOURS : 24 ELAPSED TIME(HRS): NOTE The indicated time is an approximated time for the accomplishment of the modification described in Service Bulletin. H. WEIGHT AND BALANCE (1) Variationofthe Standard Basic Empty Weight (SBEW). Kit SB235260006K01: Weight

## =+0.27 Kg. (2) Variation of the momentum with respect to the reference plane. Kit SB235260006K01: Momentum

## =+2.64 Kg m. I. ELECTRICAL LOAD DATA Not changed J. REFERENCES Aircraft Maintenance Manual (AMM):

Illustrated Tools and Equipment Manual (ITEM):

Date:Jul 08/2014 Original 06-41-54, 20-15-00, 20-21-00, 20-27-00, 20-28-00, 20-38-00, 20-50-00, 26-11-00, 26-11-11, 71-10-12, 71-10-13, 71-11-12 20-00-01, 26-11-02

SB-235-26-0006 Pag : 3

# lADS'**~SA** CN-235-SERVICEBULLETIN K. PUBLICATIONS AFFECTED AircraftMaintenance Manual CAMM): 26-11-00, 26-11-11 Illustrated Parts Catalog CIPC): 26-11-00, 71-21-20 L. INTERCHANGEABILITY/MIXABILITY Not applicable M. RELATED FIGURES

- Figure 1Modification ofthe firewall. Figure 2 Installation of support in the firewall. Figure 3Modification ofthe fire detection sensor.

- Figure 4 Placement of labels.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 4CN-235-SERVICEBULLETIN 2. MATERIAL INFORMATION A. MATERIAL

- PRICE AND AVAILABILITY

B.



### c.

FIG (1) Material Operators with aircraft shown in the effectivity ofthis Service Bulletin should send apurchase order to EADS-CASA. Quote the number ofthe Service Bulletin. The address is: EADS-CASA SERVICES

- MATERIAL SUPPORT Avda. de Arag6n, 404 28022 MADRID SPAIN Fax: +34 91 585 55 05 (2) Price and Availability Sales terms must be agreed between the Operator and EADS-CASA in accordance with the established procedure. INDUSTRY SUPPORT INFORMATION None LIST OF COMPONENTS SB235260006K01 ITEM N/P NEW QTY UM KEYWORDITEM N/P OLD INT INST DISP
1 MS20995C32 2,0 Ml Lockwir 2 35-75402-0301 2 Label 3 35-75402-0601 2 Label 8 NAS1149C0332R 2 Washer 9 MS21043-3 2 Nut 11 NAS1096-3-8 4 Screw 16 35-75428-0101 2 Support 18 37731-301 12 Washer 21 AS21919WCJ28 2 Clamp 40 LN9178-3208F 20 Rivet 51 MS21913J6 2 Plug 52 AS5178J06 2 Nut
Date:Jul 08/2014 SB-235-26-0006 Original Pag : 5CN-235-SERVICEBULLETIN FIG ITEM N/P NEW QTY UM KEYWORDITEM N/P OLD INT INST DISP 53 NAS1149C0932R 4 Washer D. LIST OF MATERIALS

- OPERATOR SUPPLIED (1) Consumable Materials DESCRIPTION REFERENCE TO CML QTY PER A/C INST DISP
Epoxy Adhesive SiliconeAdhesion Promoter Fire-Wall Sealant Silicone Sealant Fluorosilicone Sealant Fluorocarbon Sealant Sealant Tape Solvent Mat. No. Z-15.237 As required Mat. No. Z-15.904 As required Mat. No. Z-16.206 As required Mat. No. Z-16.306 As required Mat. No. Z-16.403 As required Mat. No. Z-16.421 As required Mat. No. AIMS-04- As required 05-014B/-015B Mat. No. Z-22.172 As required Mat. No. Z-23.139 As required Self-Adhering Insulation Tape Mat. No. Z-22.127 As required Lint-Free Cotton Cloths Mat. No. Z-24.930 As required NOTE : To accomplish this Service Bulletin it is also necessary to use the consumable materials listed in the referenced procedures. (2) Components None E. PARTS TO BE RE-IDENTIFIED BY THE OPERATOR Effectivity: All, except QC02. ITEM N/P NEW KEYWORD (61) 35-A3825-0101 Front

Date:Jul 08/2014 Original firewall ITEM (60) N/P OLD 35-52151-0109 INT INST DISP 03 Modify

SB-235-26-0006 Pag : 6CASA CN-235-SERVICEBULLETIN ITEM N/P NEW KEYWORD ITEM N/P OLD (63) 35-A3825-0201 Rear (62) 35-52151-0207 firewall NOTE : INT 03

- Not Interchangeable. Effectivity: QC02. ITEM N/P NEW (61) 35-A3728-0101 (63) 35-A3729-0101
NOTE : INT 03

- F. TOOLING

- PRICE None G. SPECIAL TOOLS None

Date:Jul 08/2014 Original KEYWORD ITEM N/P OLD Front (60) 35-52151-0105 firewall Rear (62) 35-52151-0205 firewall Not Interchangeable. AND AVAILABILITY INT INST DISP
03 Modify

INT INST DISP 03 Modify
03 Modify

SB-235-26-0006 Pag : 7Date:Jul 08/2014 Original CN-235-SERVICEBULLETIN



### INTENTIONALLY LEFT BLANK

SB-235-26-0006 Pag : 8CN-235-SERVICEBULLETIN 3. ACCOMPLISHMENT INSTRUCTIONS WARNING: Make sure all warning indications are respected in the reference procedures. WARNING: Make sure thatyou obey all the safety precautions oftheAMM 26-11-11. A. GENERAL (1) Preparation

(2)

(3) NOTE All the dimensions shown herein are in millimeters, unless otherwise specified. (a) Disconnect all the electrical power supplies and make sure that all the corresponding electrical circuits are isolated. (b) Prepare the aircraft for the tasks and obey all the safety precautions. (c) Put warning notices in the correct positions to prevent unwanted operation of any control or system. (d) Get access to the aircraft and find the area where the Service Bulletin will be applied. (e) Prepare the consumable material necessary to do thework. Standard Practices (a) Standard Torques CAMM 20-21-00). (b) Sealing CAMM 20-38-00). (c) SurfaceTreatment CAMM 20-50-00). (d) Electrical Items CAMM 20-15-00). (e) Electrical Wiring and Bundles CAMM 20-27-00). (f) Electrical Bonding CAMM 20-28-00). Work Breakdown On aircraft: Put the aircraft in the safe condition for maintenance tasks.

- Put the access platform in position.

- Get access to the work area.

- Disconnect the fire detection sensors.

Date:Jul 08/2014 SB-235-26-0006 Original Pag : 9

### li~DS'**~CASA** CN-235-SERVICEBULLETIN

- Remove clamps and supports.

- Remove labels. -Modify firewall.

- Install new clamps and supports.

- Connect the fire detection sensor.

- Set new labels.

- Do tests.

- Install the access panels.

- Record the accomplishment. B. MODIFICATION NOTE The item numbers referred to in this paragraph correspond to those given in the kit and to the different illustrations. NOTE The procedure for the left powerplant is described. The procedure for the right powerplant is symmetrical. NOTE The FIN numbers shown between parenthesis refer to the right powerplant. (1) Preliminary operations (a) Put the access platform under the left powerplant. (b) Remove and keep the access panels:

- 413AR (423AR).

- 413AL (423AL).

- 413AT (423AT).

- 414AT (424AT). Refer to AMM 06-41-54, AMM 71-10-12, AMM 71-11-12 and AMM 71-10-13. NOTE : Remove the panel 413AB (423AB) only when the removal ofthe bottom fire sensor set is necessary. Refer toAMM 71-10-12. (c) Do the preliminary operations described in AMM 26-11-11. (2) Removal NOTE : Keep the items thatyou removed before in storage bags to install them later. (a) Disconnect the top fire detection sensor (100). Refer to Figure 3Sheet 4. 

### 1 At the end of the support (12):

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 10CN-235-SERVICEBULLETIN

- Remove and discard the lockwire (1).

- Disconnect the connector (30) from the receptacle (29).

- Remove and discard the washer (18) from the connector (30).

- Put a protective cover/plug on the connector (30) and the receptacle (29). (b) Disconnect the bottom fire detection sensor (110). Refer to Figure 3 Sheet 7. 

### 1 Both ends ofthe support (13):



### - Remove and discard the 1ockwire (1).

- Disconnect the connector (33) from the flanged (17).

- Disconnect the connector (36) from the flanged (37).

- Remove and discard the 2washers (18) from the connectors (33) and (36). coupling coupling

- Put a protective cover/plug on the connectors (33) and (36) and on the flanged couplings (17) and (37). (c) Disconnect the end wire ofthe fire detection system (120). 

### 1 At the end of the firewall set (50): Refer to Figure 3 Sheet 2.

- Remove and discard the lockwire (1).

- Disconnect the connector (34) from the receptacle (4).

- Remove and discard the washer (18) from the connector (34).

- Put a protective cover/plug on the connector (34) and the receptacle (4).

- Remove and keep the washer (5). Remove and keep the coupler (4). 2 At the end of the support (13): Refer to Figure 3Sheet 7.

- Remove and discard the lockwire (1).

- Disconnect the connector (27) from the flanged coupling (17).

- Remove and discard the washer (18) from the connector (27).

- Put a protective cover/plug on the connector (27) and the flanged coupling (17). (d) Disconnect the end wire ofthe fire detection system (130).

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 11

## DS'

CN-235-SERVICEBULLETIN 1 At the end of the support (12): Refer to Figure 3Sheet 4.

- Remove the receptacle (29) from the clamp (10). 

## £ At the end ofthe support (13): Refer to Figure 3Sheet 7.

- Remove and discard the lockwire (1).

- Disconnect the connector (28) from the flanged coupling (37).

- Remove and discard the washer (18) from the connector (28).

- Put aprotective cover/plug on the connector (28) and the flanged coupling (37). 3 Disconnect and keep the end wire of the fire detection system (130). Refer to Figure 3Sheet 7. (e) Remove and keep the support (12), installed on the firewall set (50). Refer to Figure 3Sheet 4. Remove and keep: - 1clamp (6). - 1washer (8). - 1clamp (10). - 1screw (11). - 1grounding terminal (19). Remove and discard the 2 rivets (40) that connect to the firewall set (50). (f) Remove and discard the 6 rivets (40) that connect from the flanged couplings (17) and (37) to the support (13). Remove and keep the flanged couplings (17) and (37). Remove and discard the support (13) ofthe bottom cowling (22) of the engine. Refer to Figure 3Sheet 5. (g) Remove and keep the support (25) ofthe bottom cowling (22) of the engine. Refer to Figure 3Sheet 7. (h) At the 2clamp sets (21) ofthe side bar ofthe engine support.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 12CN-235·SERVICEBULLETIN Refer to Figure 3Sheet 6. Remove and keep:

- 2washers (8).

- 2 nuts (9). - 2screws (11). - 2clamps (14). - 2 sleeves (15). - 2clamps (21). (i) At the clamp set (35) ofthe front vertical bar ofthe engine support. Refer to Figure 3Sheet 3. Remove and keep: - 1clamp (6). - 1screw (7). - 1washer (8). - 1nut (9). - 1clamp (14). - 1sleeve (15). - 1 clamp (35). (j) EFFECTIVITY: All, except QC02. At the 2clamp sets (35) of the front horizontal bar ofthe engine support. Refer to Figure 3Sheet 2 and Figure 3 Sheet 3. Remove and keep: -2 clamps (6). - 2 screws (7). - 2washers (8). - 2 nuts (9). - 2clamps (14). - 2 sleeves (15). - 2clamps (35). (k) EFFECTIVITY: QC02. At the 2clamp sets (35) ofthe front horizontal bar ofthe engine support. Refer to Figure 3Sheet 2 and Figure 3Sheet 3. Remove and keep:

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 13CN-235-SERVICEBULLETIN - 2clamps (6). - 2screws (7). - 2washers (8). - 2nuts (9). - 2clamps (14). - 2sleeves (15). - 2clamps (35). Remove and discard the 2spacers (26). (l) Remove and discard the labels (2) and (3). Refer to Figure 4. (3) Preparation for the installation. WARNING: Take carewhen you use material Z-23.139. Obey the manufacturer's instructions strictly. WARNING: Take carewhen you use material Z-15.904. Obey the manufacturer's instructions strictly. WARNING: Take carewhen you use material Z-16.403. Obey the manufacturer's instructions strictly. WARNING: Take carewhen you use material Z-16.421. Obey the manufacturer's instructions strictly. WARNING: Take carewhen you use material AIMS-04-05-014B/-015B. Obey the manufacturer's instructions strictly. WARNING: Do not use solvents or aerosols that contain lubricants and other residues that can decompose at high temperatures and cause the system to deteriorate. (a) Make adrill hole in the firewall set (50) in the new location. Refer to the measurements given in Detail Bof Figure 1. Refer to AMM 20-50-00. (b) Clean all the supports ofthe top (100) and bottom (110) fire detection sensors and the adjacent area. (c) Clean all the supports ofthe end wires ofthe fire detection sensors (120) and (130) and the adjacent area. (d) Examine all the supports of the top (100) and bottom (110) fire detection sensors for damage, dirt and corrosion.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 14CN-235-SERVICEBULLETIN (e) Examine all the supports of the end wires of the fire detection system (120) and (130) for damage, dirt and corrosion. (f) After the removal ofthe support (12), fill the holes left by the 2rivets (40) with 2new rivets (40). Refer to Figure 2. (g) Put the support (12) thatyou kept before on the firewall set (50). Refer to the measurements given in Figure 2. (h) Transferthe drill holes from the support (12) to the firewall set (50) at the diameter given in Figure 2. Refer to AMM 20-50-00. (i) Put the flanged couplings (17) and (37) on the new support (16). Refer to Figure 3Sheet 5. (j) Transfer the drill holes from the flanged couplings (17) and (37) to the support (16) at the diameter given in Figure 3 Sheet 5. (k) Install the flanged couplings (17) and (37) on the support (16) with 6rivets (40). Cl) Clean the area around the triangular lugs of the flanged couplings (17) and (37) with solvent Mat. No. Z-23.139. (m) Seal the contour ofthe triangular lugs of the flanged couplings (17) and (37) with sealant Mat. No. AIMS-04-05- 014B/-015B. Refer toAMM 20-38-00. (n) Clean flanged couplings (17) and (37) internally as shown:

- Remove any dry contamination with a soft brush.

- Remove oil, grease or similar contamination with a soft brush and moderately apply solvent Mat. No. Z-23.139.

- Leave the solvent to dry for aminimum of ten minutes or blow with pressurized air or nitrogen. (Do not use pressure lines from the workshop because they are likely to contain damp). (o) Apply silicone adhesion promoter Mat. No. Z-15.904 in the bottom cowling (22) of the engine in the areas where supports (16) and (25) must be installed. Refer to Figure 3Sheet 5and Figure l Sheet 8. (4) Installation

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 15CN-235-SERVICEBULLETIN WARNING: Take carewhen you use material Z-15.237. Obey the manufacturer's instructions strictly. WARNING: Take carewhen you use material Z-16.421. Obey the manufacturer's instructions strictly. CAUTION When connecting the connectors, make sure that all the connectors and couplers are clean, dry and undamaged. NOTE When you install fire detection sensors, prevent unnecessary twists and kinks. Make sure the fire detection sensors has aminimum curve radius of 25.4 (Refer to AMM 26-11-00). (a) Install the access panel 413AB C423AB) if it has been removed. Refer toAMM 06-41-54 and AMM 71-10-12. (b) At the original position of the drill hole in the firewall set (50). Refer to Figure 3Sheet 2. Install:

- 2new washers (53). - 1new plug (51). - 1new hexagonal nut (52). NOTE Apply sealantMat. No. Z-16.421 on the previous set on the two sides of the firewall. Refer to AMM 20-38-00. (c) At the position ofthe new drill hole in the firewall set (50). Refer to Figure 3 Sheet 3. Install: - 1kept coupler (4). - 1kept washer (5). (d) Install the support (12) on the firewall set (50). Refer to Figure 3Sheet 4. Use the parts that follow: - 1kept clamp (6). - 1kept washer (8).

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 16CN-235-SERVICEBULLETIN - 1kept clamp (10). - 1kept screw (11). - 1kept grounding terminal (19). Refer to AMM 20-28-00. - 2new rivets (40). NOTE Wet install rivets (40) with fire-wall sealant Mat. No. Z-16.206. (e) With the flanged couplings (17) and (37) installedbefore, install the new support (16), with epoxy adhesive Mat. No. Z-15.237 on the bottom cowling (22) ofthe engine. Refer to the measurements given in Figure 3 Sheet 5. NOTE : Apply sealant Mat. No. Z-16.403 afteryou install the support (16). (f) Install the support (25) thatyou kept before in its new position as shown in Figure 3 Sheet 8, with epoxy adhesive Mat. No. Z-15.237 on the bottom cowling (22) ofthe engine, with the following parts: - 1kept washer (8). - 1kept nut (9). - 1kept screw (11). - 1kept clamp (14). - 1kept sleeve (15). NOTE : Apply sealant Mat. No. Z-16.403 afteryou install the support (25). (g) Install the 2clamps (21) thatyou kept before on the side bar of the engine support. Refer to Figure 3Sheet 6. Use the parts that follow on each clamp: - 1kept washer (8). - 1kept nut (9). - 1kept screw (11). - 1kept clamp (14). - 1kept sleeve (15). NOTE Make sure thatyou install each clamp (21) on the side bar of the engine support in the direction given in the illustration. (h) Insta11 1new clamp (21) on the front vertica1bar ofthe engine support. Refer to Figure 3Sheet 4.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 17

## FADS'**'~'~CASA** CN-235-SERVICEBULLETIN Use the parts that follow: - 1kept clamp (6). - 1 kept screw (7). - 1new washer (8). - 1new nut (9). - 1kept clamp (14). - 1kept sleeve (15). (i) Install the clamp (35) thatyou kept before on the front horizontal bar ofthe engine support. Refer to Figure 3 Sheet 2. Use the parts that follow: - 1 kept washer (8). - 1 kept nut (9). - 1new screw (11). - 1kept clamp (14). - 1kept sleeve (15). (j) Install the clamp (35) thatyou kept before on the front horizontal bar of the engine support. Refer to Figure 3 Sheet 3. Use the parts that follow: - 1 kept clamp (6). - 1 kept screw (7). - 1 kept washer (8). - 1 kept nut (9). - 1kept clamp (14). - 1kept sleeve (15). (k) Install the clamp (35) thatyou kept before on the front vertical bar ofthe engine support. Refer to Figure 3 Sheet 3. Use the parts that follow: - 1 kept clamp (6). - 1 kept washer (8). - 1kept nut (9). - 1new screw (11). (1) Connect the bottom fire detection sensor (110). Refer to Figure 3Sheet 8.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 18

# ~~~· CN-235-SERVICEBULLETIN 

### 1 Install the bottom fire detection sensor (110) on the support (25) installed in its new position. 

## £ At both ends of the support (16):

- Remove the protective cover/plug from the connectors (33) and (36) and from the flanged couplings (17) and (37). -Install 1new washer (18) on each connector (33) and (36).

- Connect the connector (33) to the flanged coupling (17). Refer toAMM 20-15-00.

- Connect the connector (36) to the flanged coupling (37)'. Refer toAMM 20-15-00.

- Tighten the connectors (33) and (36) to atorque between 9.0 Nm and 11.3 Nm.

- Safety the connectors (33) and (36) to the flanged couplings (17) and (37) with new lockwire (1).**~** Set the bottom fire detection sensor (110) by tightening the screws of all the clamps of its route to the standard torque. Refer to AMM 20-21-00. (m) Connect the end wire of the fire detection system (130). 

### 1 At the end ofthe support (12): Refer to Figure 3Sheet 4.

- Install the receptacle (29) on the clamp (10). 

## £ At the end ofthe support (16): Refer to Figure 3Sheet 7.

- Remove the protective cover/plug from the connector (28) and the flanged coupling (37). -Install 1new washer (18) on the connector (28).

- Connect the connector (28) to the flanged coupling (37). Refer to AMM 20-15-00.

- Tighten the connector (28) to atorque between 9.0 Nm and 11.3 Nm.

- Safety the connector (28) to the flanged coupling (37) with new lockwire (1).**~** Attach the end wire ofthe fire detection system (130) by tightening the screws of all the clamps of its route to the standard torque. Refer to AMM 20-21-00 (n) Connect the top fire detection sensor (100). Refer to Figure 3 Sheet 4.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 19CN-235-SERVICEBULLETIN 1 Install the top fire detection sensor (100) on:

- The 2clamps (21) of the side bar ofthe engine support, installed in their new positions. NOTE Make sure that the route ofthe top fire detection sensor (100) by the side bar ofthe engine support is kept away from the inlet and outlet ofthe starter generator (20).

- The clamp (35) ot the front vert1cal bar of the eng1ne support.

- The new clamp (21) ofthe front vertical bar ofthe engine support. 

## £ At the end ofthe support (12):

- Remove the protective cover/plug from the connector (30) and the receptacle (29).

- Install 1new washer (18) on the connector (30).

- Connect the connector (30) on the receptacle (29). Refer to AMM 20-15-00.

- Tighten the connector (30) to atorque between 9.0 Nm and 11.3 Nm.

- Safety the connector (30) to the receptacle (29) with new lockwire (1).**~** Set the top fire detection sensor (100) by tightening the screws of all the clamps of its route to the standard torque. Refer toAMM 20-21-00 (o) Connect the end wire of the fire detection system (120). Refer to Figure 3 Sheet 3. 

### 1 Install the end wire ofthe fire detection system (120) on: The 2clamps (35) ofthe front bar ofthe engine support, installed in their new positions.

- The clamp (35) ofthe front vertical bar of the engine support. 

## £ At the end of the firewall set (50):

Date:Jul 08/2014 Original - Remove the protective cover/plug from the connector (34) and the coupler (4).

- Install 1new washer (18) on the connector (34).

- Install the washer (5) thatyou kept before.

- Connect the connector (34) to the coupler (4). Refer to AMM 20-15-00.

SB-235-26-0006 Pag : 20C. TEST CN-235-SERVICEBULLETIN

- Tighten the connector (34) to atorque between 9.0 Nm and 11.3 Nm.

- Safety the connector (34) to the washer (5) with new lockwire (1). 

### l At the end of the support (16): Refer to Figure 3Sheet 8.

- Remove the protective cover/plug from the connector (27) and the flanged coupling (17).

- Install 1new washer (18) on the connector (27).

- Connect the connector (27) ofthe flanged coupling (17). Refer to AMM 20-15-00.

- Tighten the connector (27) to atorque between 9.0 Nm and 11.3 Nm.

- Safetythe connector (27) to the flanged coupling (17) with new lockwire (1). 

### i Attach the end wire ofthe fire detection system (120) by tightening the screws of all the clamps of its route to the standard torque. Refer to AMM 20-21-00 (p) Apply silicone sealantMat. No. Z-16.306 to the support (16). Attach the connectors (27) and (28) of the end wires of the fire detection system (120) and (130) to the support (16) with self-adhering insulation tape Mat. No. Z-22.127. Refer to Figure 3Sheet 8. NOTE Do not cover the nut (24) with the self-adhering insulation tape Mat. No. Z-22.127. (q) Attach the negative terminal ofthe end wires of the fire detection system (120) and (130) with tapeMat. No. Z-22.172. Refer to Figure 3 Sheet 8. (r) Put the self-adhesive labels (2) and (3) in the new positions given in Figure 4. (s) Re-identify the modified parts (See section 2.E.).

NOTE : The tests thatyou must do on the left powerplant are described here. The procedure is the same for the right powerplant. (1) Preliminary isolation and continuity checks. Refer to Figure 3.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 21CN-235-SERVICEBULLETIN (a) Disconnect the connectors (34) and (70) from their receptacles (4) and (71). NOTE Install protective covers/plugs on the connectors and receptacles to prevent contamination. NOTE Keep the protective covers/plugs until the parts are installed again. (b) Connect the multimeter, ITEM 20-00-01, between the pins A, which correspond to the central contacts, of the receptacles (4) and (71).

- The resistancemust be between 62 and 110 ohms. NOTE Ifthe result of the measurement is outside, but near, the limit given, do an inspection to make sure that the system is free of dirt or corrosion. If the result is very far from the limit given, contact Airbus Defence 

### &Space. (c) Connect the isolation meter, ITEM 26-11-02, between pin B, external, and pin Aof the receptacle (4). Apply a tension between 350VDC and 500VDC. (d) If the resistance value is very high above the established value of 20 megaohms, go to section 3.C.(4). (e) Disconnect the multimeter, ITEM 20-00-01, and the isolation meter, ITEM 26-11-02. (2) Drying of the connectors. Refer to Figure 3. (a) Clean the area adjacent to the connectors (27), C28), (30), (33) and (36) with cotton cloths Mat. No. Z-24.930, or with a brush and solvent Mat. No. Z-23.139. (b) Disconnect the connector (30) from the receptacle (29), the connectors (28) and (36) from the flanged coupling (37) and the connectors (27) and (33) from the flanged coupling (17). (c) Install protective covers/plugs on the connectors and couplers to prevent contamination. NOTE Keep the protective covers/plugs until the parts are installed again. (d) Remove and discard the washers (18).

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 22CN-235-SERVICEBULLETIN (e) Clean with abrush and dry each connector and coupler with a hot air dryer. Do not use the pressure lines from the workplace. NOTE Make sure thatthe supports and attachment clamps of the fire sensor are not damaged. Refer to AMM 26-11-11. NOTE Take carewhen you do maintenance tasks near or on the fire sensors, to prevent damages caused by the tools and equipment used. Refer to AMM 26-11-00. (3) Isolation and continuity checks. Refer to Figure 3. (a) Connect the isolationmeter, ITEM 26-11-02, between:

- Pin A(central) and Pin B(external) of each connector (27), (28), (30), (33) and (36).

- Pin Aand Pin Bof each flanged couplings (17) and (37) and the receptacle (29).

- Apply tension between 350VDC and 500VDC and make sure that the measurement thatyou get is higher than 20 megaohms in each case. WARNING: If any part shows values outside the limit, dry the part again and do the isolation test again. If the value is still outside the limit, discard and replace the partwith anew one. Contact Airbus Defence 

### &Space. (b) Install 1new washer (18) on each connector (27), (28), (30), (33) and (36). Do not install two washers (18) on one connector. WARNING: Make sure that the washer (18) is installedwith its flat side against the female side of the connector. (c) Remove the protective covers/plugs. (d) Connect the connectors (27), (28), (30), (33) and (36) to their flanged couplings (17), (29) and (37). NOTE Tighten the connectors to a torque between 9.0 Nm and 11.3 Nm (79.64 lbf and 100 lbf). Safety the connectors with lockwire. (e) Do the isolation and continuity checks from section 3.C.(1) again to check the wire harness fully.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 23CN-235-SERVICEBULLETIN (f) Connect the connectors (34) and (70). (4) Sealing procedure. Refer to Figure 3. (a) Make sure that the areas thatyou must seal are clean of dirt or unwanted material. (b) Covering procedure:

D. CLOSE UP - The barrier layermust made up of acircling cover ofthe connector.

- The thickness ofthe tape must be chosen in away that allows easy application.

- The application must overlap at least 51% between each turn.

- The tightness ofthe belt during the covering process must be limited to 5% ofthe total length of the belt.

- At the start and the end ofthe covering you must add 2 or 3more turns.

- The speed and tension in the covering must not change during this process.

- The area of covering must be from 5em on the shrinkable sleeve to the nut ofthe connector. The nut must be completely covered. NOTE Take special carewhen you remove all the sealant that was there before, to prevent any damage to the fire sensor system.
(1) Install the access panels thatyou kept before:

- 413AR (423AR).

- 413AL (423AL).

- 413AT (423AT).

- 414AT (424AT). Refer to AMM 06-41-54, AMM 71-10-12, AMM 71-11-12 and AMM 71-10-13. (2) Remove the access platform. (3) Remove the safety clipswith tags and close the circuit breakers thatyou opened before. (4) Remove the warning notices from the cockpit. (5) Make sure that the area below and around the aircraft is free of items that block it.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 24

# 8\DS'**~SA** CN-235-SERVICEBULLETIN (6) Remove all the tools and equipment from the work area. Make sure that the work area is clean. E. DOCUMENTATION Write in the applicable aircraft records (Aircraft Modification Log Book) thatyou have done all the work given in this Service Bulletin. F. FIGURES See next page/s.

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 25Date:Jul 08/2014 Original CN-235-SERVICEBULLETIN



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# <!>RIVET HEAD ON HIDDEN SIDE.**~** WET INSTALL RIVETS (40) WITH FIRE-WALL**~SEALANT** MAT. No. Z-16.206.**~**TRANSFER THE DRILL HOLE FROM THE SUPPORT (12)**~**TO THE FIREWALL (50).**~** FILL HOLES WITH RIVETS (40). 

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Date:Jul 08/2014 Original SB-235-26-0006 Pag : 320 0 11'1 0 co 0 ,.., 37 CN-235-SERVICEBULLETIN 

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Date:Jul 08/2014 Original SB-235-26-0006 Pag : 33CN-235-SERVICEBULLETIN



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## DS'

CN-235-SERVICEBULLETIN 

### FIRE PROTECTION ENGINE FIRE EXTINGUISHING. MODIFICATION OF THE ENGINE FIRE DETECTION SYSTEM. REPORTING SHEET Please complete the appropriate item (A or B): A - SB WILL BE embodied

......................... YES/NO (if NO please comment) If YES, aircraft concerned (as per SB effectivity by default) and planned dates (month/year) ofembodiement:

..........................................
B - SB HAS BEEN embodied on aircraft:

....................................... Operator comments:
..........................................................
From Airline:

............................................................... Name/Title:

................................................................. Signature:..................... Date:

..................... If operational documentation is affected (see Paragraph 1.K of this SB): If information is needed prior to next normal revision or prior to SB embodiment, please indicate required service(s): Either Advance data

.................................YES/NO Or Intermediate/Temporary revision

..............YES/NO Important Information: This SB will only be incorporated in your maintenance and operational documentation if this sheet is returned to EADS-CASACMTAD) and signed by aduly authorised representative. With the next feasible revision, this will result in

- updating ofmaintenance documentation to show pre and post SB data.

- updating ofmaintenance and operational documentation to show post SB data after embodiment. Ifthis SB requires previous or simultaneous accomplishment of other SBs, EADS-CASA(MTAD) shall automatically include them in themanual revisions. Please return this completed sheet to: AIRBUS MILITARY ENGINEERING SUPPORT

- SERVICE ENGINEERING Autovia A-4, km 528,5. San Pablo North. 41020 Seville (Spain) TEL: (34) 95 459 41 69 FAX: (34) 95 459 35 31

Date:Jul 08/2014 Original SB-235-26-0006 Pag : 1of 1