DS' 

CASA 

CN-235 - SERVICE BULLETIN 

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 of the transfer of an aircraft from one version 

to another will 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 

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CN-235 - SERVICE BULLETIN 

C. REASON 

(1) HISTORY 

The possibility that a false alarm occurs because of damp in the 

connectors of the 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 of this document has been approved by the 

authority of the DOA No. EASA.21J.032. 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 2 
CN-235 - SERVICE BULLETIN 

NOTE: This issue is a translation 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 of the 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 of part 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) Variationof the 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 

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lADS' 

~SA 

CN-235 - SERVICE BULLETIN 

K. PUBLICATIONS AFFECTED 

Aircraft Maintenance 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 1 Modification of the firewall. 

Figure 2 Installation of support in the firewall. 

Figure 3 Modification of the fire detection sensor. 

- Figure 4 Placement of labels. 

Date:Jul 08/2014 

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SB-235-26-0006 

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CN-235 - SERVICE BULLETIN 

2. MATERIAL INFORMATION 

A. MATERIAL - PRICE AND AVAILABILITY 

B. 

c. 

FIG 

(1) Material 

Operators with aircraft shown in the effectivity of this Service 

Bulletin should send a purchase order to EADS-CASA. Quote the 

number of the 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 KEYWORD ITEM 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 : 5 
CN-235 - SERVICE BULLETIN 

FIG ITEM N/P NEW QTY UM KEYWORD ITEM 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 

Silicone Adhesion 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 

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CASA 

CN-235 - SERVICE BULLETIN 

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 

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Date:Jul 08/2014 

Original 

CN-235 - SERVICE BULLETIN 

INTENTIONALLY LEFT BLANK 

SB-235-26-0006 

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CN-235 - SERVICE BULLETIN 

3. ACCOMPLISHMENT INSTRUCTIONS 

WARNING: Make sure all warning indications are respected in the reference 

procedures. 

WARNING: Make sure that you obey all the safety precautions of the AMM 

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 the work. 

Standard Practices 

(a) Standard Torques CAMM 20-21-00). 

(b) Sealing CAMM 20-38-00). 

(c) Surface Treatment 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 - SERVICE BULLETIN 

- 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 

of the bottom fire sensor set is necessary. 

Refer to AMM 71-10-12. 

(c) Do the preliminary operations described in AMM 26-11-11. 

(2) Removal 

NOTE : Keep the items that you removed before in storage bags to 

install them later. 

(a) Disconnect the top fire detection sensor (100). 

Refer to Figure 3 Sheet 4. 

1 At the end of the support (12): 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 10 
CN-235 - SERVICE BULLETIN 

- 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 of the support (13): 

- Remove and discard the 1 ockwi re ( 1). 

- Disconnect the connector (33) from the flanged 

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

(37). 

- Remove and discard the 2 washers (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 of the 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 3 Sheet 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 of the fire detection system (130). 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 11 
DS' 

CN-235 - SERVICE BULLETIN 

1 At the end of the support (12): 

Refer to Figure 3 Sheet 4. 

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

£ At the end of the support (13): 

Refer to Figure 3 Sheet 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 a protective 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 3 Sheet 7. 

(e) Remove and keep the support (12), installed on the firewall 

set (50). 

Refer to Figure 3 Sheet 4. 

Remove and keep: 

- 1 clamp (6). 

- 1 washer (8). 

- 1 clamp (10). 

- 1 screw (11). 

- 1 grounding 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) of the bottom cowling (22) of the 

engine. Refer to Figure 3 Sheet 5. 

(g) Remove and keep the support (25) of the bottom cowling (22) 

of the engine. Refer to Figure 3 Sheet 7. 

(h) At the 2 clamp sets (21) of the side bar of the engine 

support. 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 12 
CN-235 · SERVICE BULLETIN 

Refer to Figure 3 Sheet 6. 

Remove and keep: 

- 2 washers (8). 

- 2 nuts (9). 

- 2 screws (11). 

- 2 clamps (14). 

- 2 sleeves (15). 

- 2 clamps (21). 

(i) At the clamp set (35) of the front vertical bar of the 

engine support. 

Refer to Figure 3 Sheet 3. 

Remove and keep: 

- 1 clamp (6). 

- 1 screw (7). 

- 1 washer (8). 

- 1 nut (9). 

- 1 clamp (14). 

- 1 sleeve (15). 

- 1 clamp (35). 

(j) EFFECTIVITY: All, except QC02. 

At the 2 clamp sets (35) of the front horizontal bar of the 

engine support. 

Refer to Figure 3 Sheet 2 and Figure 3 Sheet 3. 

Remove and keep: 

-2 clamps (6). 

- 2 screws (7). 

- 2 washers (8). 

- 2 nuts (9). 

- 2 clamps (14). 

- 2 sleeves (15). 

- 2 clamps (35). 

(k) EFFECTIVITY: QC02. 

At the 2 clamp sets (35) of the front horizontal bar of the 

engine support. 

Refer to Figure 3 Sheet 2 and Figure 3 Sheet 3. 

Remove and keep: 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 13 
CN-235 - SERVICE BULLETIN 

- 2 clamps (6). 

- 2 screws (7). 

- 2 washers (8). 

- 2 nuts (9). 

- 2 clamps (14). 

- 2 sleeves (15). 

- 2 clamps (35). 

Remove and discard the 2 spacers (26). 

(l) Remove and discard the labels (2) and (3). Refer to Figure 

4. 

(3) Preparation for the installation. 

WARNING: Take care when you use material Z-23.139. Obey the 

manufacturer's instructions strictly. 

WARNING: Take care when you use material Z-15.904. Obey the 

manufacturer's instructions strictly. 

WARNING: Take care when you use material Z-16.403. Obey the 

manufacturer's instructions strictly. 

WARNING: Take care when you use material Z-16.421. Obey the 

manufacturer's instructions strictly. 

WARNING: Take care when 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 a drill hole in the firewall set (50) in the new 

location. Refer to the measurements given in Detail B of 

Figure 1. 

Refer to AMM 20-50-00. 

(b) Clean all the supports of the top (100) and bottom (110) 

fire detection sensors and the adjacent area. 

(c) Clean all the supports of the end wires of the 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 : 14 
CN-235 - SERVICE BULLETIN 

(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 of the support (12), fill the holes left 

by the 2 rivets (40) with 2 new rivets (40). 

Refer to Figure 2. 

(g) Put the support (12) that you kept before on the firewall 

set (50). Refer to the measurements given in Figure 2. 

(h) Transfer the 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 3 Sheet 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 6 rivets (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 of the triangular lugs of the flanged 

couplings (17) and (37) with sealant Mat. No. AIMS-04-05-

014B/-015B. Refer to AMM 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 a minimum 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 3 Sheet 5 and Figure l Sheet 8. 

(4) Installation 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 15 
CN-235 - SERVICE BULLETIN 

WARNING: Take care when you use material Z-15.237. Obey the 

manufacturer's instructions strictly. 

WARNING: Take care when 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 a minimum curve radius of 25.4 

(Refer to AMM 26-11-00). 

(a) Install the access panel 413AB C423AB) if it has been 

removed. Refer to AMM 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 3 Sheet 2. 

Install: 

- 2 new washers (53). 

- 1 new plug (51). 

- 1 new hexagonal nut (52). 

NOTE Apply sealant Mat. 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 of the new drill hole in the firewall set 

(50). 

Refer to Figure 3 Sheet 3. 

Install: 

- 1 kept coupler (4). 

- 1 kept washer (5). 

(d) Install the support (12) on the firewall set (50). 

Refer to Figure 3 Sheet 4. 

Use the parts that follow: 

- 1 kept clamp (6). 

- 1 kept washer (8). 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

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CN-235 - SERVICE BULLETIN 

- 1 kept clamp (10). 

- 1 kept screw (11). 

- 1 kept grounding terminal (19). Refer to AMM 20-28-00. 

- 2 new rivets (40). 

NOTE Wet install rivets (40) with fire-wall sealant Mat. 

No. Z-16.206. 

(e) With the flanged couplings (17) and (37) installed before, 

install the new support (16), with epoxy adhesive Mat. No. 

Z-15.237 on the bottom cowling (22) of the engine. Refer to 

the measurements given in Figure 3 Sheet 5. 

NOTE : Apply sealant Mat. No. Z-16.403 after you install 

the support (16). 

(f) Install the support (25) that you 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) of the 

engine, with the following parts: 

- 1 kept washer (8). 

- 1 kept nut (9). 

- 1 kept screw (11). 

- 1 kept clamp (14). 

- 1 kept sleeve (15). 

NOTE : Apply sealant Mat. No. Z-16.403 after you install 

the support (25). 

(g) Install the 2 clamps (21) that you kept before on the side 

bar of the engine support. 

Refer to Figure 3 Sheet 6. 

Use the parts that follow on each clamp: 

- 1 kept washer (8). 

- 1 kept nut (9). 

- 1 kept screw (11). 

- 1 kept clamp (14). 

- 1 kept sleeve (15). 

NOTE Make sure that you install each clamp (21) on the 

side bar of the engine support in the direction given 

in the illustration. 

(h) Insta 11 1 new clamp ( 21) on the front verti ca 1 bar of the 

engine support. 

Refer to Figure 3 Sheet 4. 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 17 
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'~'~CASA 

CN-235 - SERVICE BULLETIN 

Use the parts that follow: 

- 1 kept clamp (6). 

- 1 kept screw (7). 

- 1 new washer (8). 

- 1 new nut (9). 

- 1 kept clamp (14). 

- 1 kept sleeve (15). 

(i) Install the clamp (35) that you kept before on the front 

horizontal bar of the engine support. 

Refer to Figure 3 Sheet 2. 

Use the parts that follow: 

- 1 kept washer (8). 

- 1 kept nut (9). 

- 1 new screw (11). 

- 1 kept clamp (14). 

- 1 kept sleeve (15). 

(j) Install the clamp (35) that you 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). 

- 1 kept clamp (14). 

- 1 kept sleeve (15). 

(k) Install the clamp (35) that you kept before on the front 

vertical bar of the engine support. 

Refer to Figure 3 Sheet 3. 

Use the parts that follow: 

- 1 kept clamp (6). 

- 1 kept washer (8). 

- 1 kept nut (9). 

- 1 new screw (11). 

(1) Connect the bottom fire detection sensor (110). 

Refer to Figure 3 Sheet 8. 

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~~~· CN-235 - SERVICE BULLETIN 

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 1 new washer (18) on each connector (33) and 

(36). 

- Connect the connector (33) to the flanged coupling 

(17). Refer to AMM 20-15-00. - Connect the connector (36) to the flanged coupling 

(37)'. Refer to AMM 20-15-00. - Tighten the connectors (33) and (36) to a torque 

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 of the support (12): 

Refer to Figure 3 Sheet 4. 

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

£ At the end of the support (16): 

Refer to Figure 3 Sheet 7. 

- Remove the protective cover/plug from the connector 

(28) and the flanged coupling (37). 

-Install 1 new 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 a torque 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 of the 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 

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CN-235 - SERVICE BULLETIN 

1 Install the top fire detection sensor (100) on: 

- The 2 clamps (21) of the side bar of the engine 

support, installed in their new positions. 

NOTE Make sure that the route of the top fire 

detection sensor (100) by the side bar of the 

engine support is kept away from the inlet and 

outlet of the starter generator (20). 

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

support. 

- The new clamp (21) of the front vertical bar of the 

engine support. 

£ At the end of the support (12): 

- Remove the protective cover/plug from the connector 

(30) and the receptacle (29). - Install 1 new 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 a torque 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 to AMM 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 of the fire detection system (120) 

on: 

The 2 clamps (35) of the front bar of the engine 

support, installed in their new positions. - The clamp (35) of the 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 1 new washer (18) on the connector (34). - Install the washer (5) that you kept before. - Connect the connector (34) to the coupler (4). Refer 

to AMM 20-15-00. 

SB-235-26-0006 

Pag : 20 
C. TEST 

CN-235 - SERVICE BULLETIN 

- Tighten the connector (34) to a torque 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 3 Sheet 8. 

- Remove the protective cover/plug from the connector 

(27) and the flanged coupling (17). - Install 1 new washer (18) on the connector (27). - Connect the connector (27) of the flanged coupling 

(17). Refer to AMM 20-15-00. - Tighten the connector (27) to a torque between 9.0 Nm 

and 11.3 Nm. - Safety the connector (27) to the flanged coupling (17) 

with new lockwire (1). 

i Attach the end wire of the 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 sealant Mat. 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 3 Sheet 8. 

NOTE Do not cover the nut (24) with the self-adhering 

insulation tape Mat. No. Z-22.127. 

(q) Attach the negative terminal of the end wires of the 

fire detection system (120) and (130) with tape Mat. 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 that you 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 : 21 
CN-235 - SERVICE BULLETIN 

(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 resistance must be between 62 and 110 ohms. 

NOTE If the 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 A of 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 a rea adjacent to the connectors ( 27), C 28), ( 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 : 22 
CN-235 - SERVICE BULLETIN 

(e) Clean with a brush and dry each connector and coupler with 

a hot air dryer. Do not use the pressure lines from the 

workplace. 

NOTE Make sure that the supports and attachment clamps 

of the fire sensor are not damaged. Refer to AMM 

26-11-11. 

NOTE Take care when 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 isolation meter, ITEM 26-11-02, between: 

- Pin A (central) and Pin B (external) of each connector 

(27), (28), (30), (33) and (36). - Pin A and Pin B of each flanged couplings (17) and (37) 

and the receptacle (29). - Apply tension between 350VDC and 500VDC and make sure that 

the measurement that you 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 part with a new one. Contact Airbus 

Defence & Space. 

(b) Install 1 new 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 installed with 

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 : 23 
CN-235 - SERVICE BULLETIN 

(f) Connect the connectors (34) and (70). 

(4) Sealing procedure. 

Refer to Figure 3. 

(a) Make sure that the areas that you must seal are clean of 

dirt or unwanted material. 

(b) Covering procedure: 

D. CLOSE UP 

- The barrier layer must made up of a circling cover of the 

connector. 

- The thickness of the tape must be chosen in a way that 

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

turn. 

- The tightness of the belt during the covering process must 

be limited to 5% of the total length of the belt. - At the start and the end of the covering you must add 2 

or 3 more turns. - The speed and tension in the covering must not change 

during this process. - The area of covering must be from 5 em on the shrinkable 

sleeve to the nut of the connector. The nut must be 

completely covered. 

NOTE Take special care when you remove all the seal ant 

that was there before, to prevent any damage to the 

fire sensor system. 

(1) Install the access panels that you 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 clips with tags and close the circuit breakers 

that you 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 - SERVICE BULLETIN 

(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) that you 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 : 25 
Date:Jul 08/2014 

Original 

CN-235 - SERVICE BULLETIN 

INTENTIONALLY LEFT BLANK 

SB-235-26-0006 

Pag : 26 
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CENTERLINE 

CN-235 - SERVICE BULLETIN 

BEFORE 

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--------------------

Figure 1. Modification of the firewall. 

Date:Jul 08/2014 SB-235-26-0006 

Original Pag : 27 
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CN-235 - SERVICE BULLETIN 

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BEFORE 

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SYMBOL ITEM 

MIN. MAX. REMARKS 

~ 40 3.25 3.40 000 

<!> 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). 

AFTER 

345 

Figure 2. Installation of support in the firewall. 

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12 

Date:Jul 08/2014 SB-235-26-0006 

Original Pag : 28 
DS' 

CASA 

CN-235- SERVICE BULLETIN 

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Date:Jul 08/2014 

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SB-235-26-0006 

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CN-235 - SERVICE BULLETIN 

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~ EFFECTIVITY: QC02. 

Figure 3. Modification of the fire detection sensor. (Sheet 2 of 8) 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 30 
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CN-235 - SERVICE BULLETIN 

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Figure 3. Modification of the fire detection sensor. (Sheet 3 of 8) 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 31 
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CN-235 - SERVICE BULLETIN 

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Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 32 
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37 

CN-235 - SERVICE BULLETIN 

IM-MI 

BEFORE 

40 (6 PLACES) 

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AFTER 

DIAMETER 

SYMBOL ITEM REMARKS MIN. MAX. 

~ 40 3.25 3.40 000 

0 RIVET HEAD ON VISIBLE SIDE. 

0 WET INSTALL RIVETS (40) WITH FIRE-WALL 

SEALANT MAT. No. Z-16.206. 

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~ APPLY SILICONE ADHESION PROMOTER Z-15.904. 

~ APPLY EPOXY ADHESIVE Z-15.237. 

~ APPLY SEALANT Z-16,403. 

~ APPLY SEALANT AIMS 04-05-014B/-015B. 

Figure 3. Modification of the fire detection sensor. (Sheet 5 of 8) 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 33 
CN-235 - SERVICE BULLETIN 

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1-~~:___:~ ~= -:: ~~ :: ~~ :: ~~::: ~~ :: ~~ :: ~~ =~~,_-,-_ --' -'--'-"'-------<~--'-'--"---+-1-~lll : L_ ------ 1 I 

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Figure 3. Modification of the fire detection sensor. (Sheet 6 of 8) 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 34 
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CN-235 - SERVICE BULLETIN 

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Figure 3. Modification of the fire detection sensor. (Sheet 7 of 8) 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 35 
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CN-235 - SERVICE BULLETIN 

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MINIMUN BENDING RADIUS R=25.4. 

APPLY ADHESION PROMOTER Z-15.904. 

APPLY ADHESIVE EPOXY Z-15.237. 

APPLY SEALANT Z-16.403. 

BAND THE INDICATED ZONE, OVERLAPING 50% 

AT LEAST, WITH SELF-ADHERING INSULATION 

TAPE MAT. No. Z-22.127. 

DO NOT COVER THE NUT (24). 

APPLY SILICONE SEALANT Z-16.306. 

FIX THE FINAL END WITH TAPE Z-22.172. 

I --~,~-- !· 336 TO ENGINE 

CENTERLINE 

AFTER 

Figure 3. Modification of the fire detection sensor. (Sheet 8 of 8) 

Date:Jul 08/2014 

Original 

SB-235-26-0006 

Pag : 36 
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CN-235 - SERVICE BULLETIN 

2 

~INSTALL LABEL ON HIDDEN SIDE. 

Figure 4. Placement of labels. 

00 

BEFORE 

00 

AFTER 

Date:Jul 08/2014 SB-235-26-0006 

Original Pag : 37 
Date:Jul 08/2014 

Original 

CN-235 - SERVICE BULLETIN 

INTENTIONALLY LEFT BLANK 

SB-235-26-0006 

Pag : 38 
DS' 

CN-235 - SERVICE BULLETIN 

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) of embodiement: ......................................... . 

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 a duly authorised representative. With the next feasible 

revision, this will result in 

- updating of maintenance documentation to show pre and post SB data. - updating of maintenance and operational documentation to show post SB 

data after embodiment. 

If this SB requires previous or simultaneous accomplishment of other SBs, 

EADS-CASA(MTAD) shall automatically include them in the manual 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 : 1 of 1