# SERVICE BULLETIN EC135
CHANGE INSTRUCTION NO. 2 FOR EC135-26A-003

PAGE 1 of 1 2011-12-19 Date: First issue: 2011-03-24

Revision 01: 2011-05-16 Revision 02: 2011-12-19
Please replace Revision 01 of Alert Service Bulletin EC135-26A-003 with Revision 02. Revision 02 distinguishes for the retrofit of helicopters with double fire extinguishing system, whether an airconditioning system is installed or not. On helicopters with double fire extinguishing system and air conditioning, Revision 02 must be accomplished by June 30, 2012 at the latest. All other helicopters -- including helicopters with double fire extinguishing system but without airconditioning system -- are not affected by the measures given in this Revision.

# ALERT SERVICE BULLETIN EC135

EC135-26A-003 PAGE 1 of 15 2011-03-24 REVISION 02, 2011-12-19 

## Fire Protection System -- Engine Fire Extinguishing System -- Retrofit of heat-resistant injection tubes 1. Planning Information A. Effectivity (1) Helicopters affected: EC135/EC635, all models, S/N 0005 up to and including S/N 0869, equipped with Single engine fire extinguishin g system Tkz. L262M1808101 )a , L262M1812101 )b and L262M1812102 )c

. Installed only on helicopters of the BPOL : Double engine fire exti nguishing system L262M1813102 )d

. )a as part of L262M1802051. )b as part of L262M1802052 or L262M1802053. )c as part of L262M1802053V001. )d as part of L262M1804052 or L262M1804052V001. (2) Components affected: For single engine fire extingui shing system: RH tube L262M1810101 LH tube L262M1811801 / L262M1809101 For double engine fire extinguishin g system: RH tube L262M1814101 RH tube L262M1808212 LH tube elbow L262M1815206 LH tube L262M1808211. (3) Spare Parts affected: See 1.A.(2). B. Concurrent Requirements Not applicable. C. Reason If the engines catch fire the fire extinguisher injection tubes might deform due to local heat which possibly impairs the fire extinguishing substance feed-through. With this Alert Service Bulletin ECD therefore describes the retrofit/modification of more heat-resistant injection tubes which comply with the current regulations. D. Description Remove and modify the injection tubes. Re-install the injection tubes.

This document is available on the internet: www.eurocopter.com/techpub

# ALERT SERVICE BULLETIN EC135

EC135-26A-003 PAGE 2 of 15 REVISION 02, 2011-12-19 2011-03-24 E. Compliance (1) The measures described in this Alert Service Bulletin must be accomplished by March 31, 2012. (2) The measures for the double engine fire extinguishing system must be accomplished on helicopters without air conditioning i.a.w. Alert Service Bulletins by December 31, 2011 at the latest. (3) The measures for the double engine fire extinguishing system must be accomplished on helicopters with air conditioning i.a.w. this Alert Service Bulletin by June 30, 2012 at the latest. (4) Stored spare parts must be modified i.a.w. Section 3. of this Alert Service Bulletin before they are installed on the helicopter. F. Approval The information or instructions contained in this document refer to change no. 1555. The technical content of this document is approved under the authority of DOA No. EASA.21J.034. G. Manpower For installation/removal and modification of the tubes: approx. 4.5 hours. For installation/removal: Rear structure: approx. 15 hours. Air conditioning system plate: approx. 20 hours. H. Weight and Balance Not applicable. I. Electrical Load Data Not applicable. J. Software Accomplishment Summary Not applicable. K. References AMM EC135, AMM EC135/635. L. Other publications affected The changes to AMM EC135, AMM EC135/635 and to IPC EC135, IPC EC635 which are required as a result of this Alert Service Bulletin will be incorporated with one of the next revisions.

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 3 of 15**  **2011-03-24 REVISION 02, 2011-12-19**  **M. Interchangeability of Parts After this Alert Service Bulletin has been accomplished the**  **standard parts given below can be installed:**  **Single engine fire extinguishing system: -- P/N L262M1811101 (standard) inst**  **ead of modified tubes P/N L262M1809101 and L262M1811801.**  **-- P/N L262M1810102 (standard) instead of modified tube P/N L262M1810101.**  **Double engine fire extinguishing system (**  **for HC without**  **Air Conditioning System )**  **: -- P/N L262M1814802 (standard) instead of modified tube**  **P/N L262M1814101. -- P/N L262M1815803 and L262M1815209 (standard)**  **instead of modified tube L262M1815206. Double engine fire extinguishing system**  **( for HC**  **with Air Conditioning System**  **): -- P/N L262M1814802 (standard) instead of modified tube**  **P/N L262M1814101. -- P/N L262M1815804 and L262M1815209 (standard)**  **instead of modified tube L262M1815206.**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 4 of 15**  **REVISION 02, 2011-12-19 2011-03-24**  **2. Material Information A. Material -- Price and Availability**  **Information on cost and availability of required retrofit k it SB-135-26A-003-2C1,**  **SB-135-26A-003-2C2, SB-135-26A-003-2C3 and SB-135-26A- 003-2C44 will be provided**  **by ECD, Dept. Spares Order Administration on request. B. Support Information**  **The material kits required will be delivered by EUROCOPTER f ree of cost only when the**  **incoming order is received by October 31, 2011. Material kit s ordered after October 31, 2011**  **will be charged with the ruling prices. Information Notice IN 2372-I-26 has been issued by Eurocopt**  **er as additional information to retrofit kits SB-135-26A-003-2C1 and SB-135-26A-003-2C2** 
**. C. Material Necessary for Each Helicopter**  **EFFECTIVITY S/N 0005 and S/N 0006 for single engine fire extinguishing sy** **stem. Retrofit kit SB-135-26A-003-2C1, based on design document**  **L262M1812103. No.**  **New P/N Keyword**  **Old P/N Qty**  **Disposition** 1 L262M1810802 RH tube elbow -- 1 A 2 -- RH tube L262M1810101 1 D 3 L262M1811803 LH tube elbow -- 1 A 4 L262M1811101 LH tu be -- 1 A 4

-- LH tu be L262M1809101 1 C 5 GBSM21--23/18SKW4 C l a m p -- 4 A 5

-- C l a m p DIN3017AL16--27W2--1 2 C 6 L262M10X1201 Blanking cap -- 2 A 7 -- PU-lacquer (CM 478)
-- a.n.* B 8 -- Hardener (CM 479)
-- a.n.* B 9 -- Thinner (CM 480)
-- a.n.* B

**EFFECTIVITY S/N 0007 up to and including S/N 0869 for single engine fire ex** **tinguishing**

**system. Retrofit kit SB-135-26A-003-2C2, based on design document**  **L262M1812103.**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 5 of 15**  **2011-03-24 REVISION 02, 2011-12-19**  **No. New P/N**  **Keyword Old P/N**  **Qty Disposition**  1 L262M1810802 RH tube elbow -- 1 A 2 -- RH tube L262M1810101 1 D 3 L262M1811803 LH tube elbow -- 1 A 4 -- LH tube L262M1811801 1 D GBSM21--23/18SKW4
-- 4 A 5 -- Clamp DIN3017--A--16--27X9 --W2--2 or DIN3017AL16--27W2--1 2 C 6 L262M10X1201 Blanking cap -- 2 A 7 -- PU-lacquer (CM 478)
-- a.n.* B 8 -- Hardener (CM 479)
-- a.n.* B 9 -- Thinner (CM 480)
-- a.n.* B

**EFFECTIVITY S/N 0005 up to and including S/N 0869 for double engine fire** 

**extinguishing system for HC without**  **Air Conditioning System. Retrofit kit SB-135-26A-003-2C3, based on design document**  **L262M1813103. No.**  **New P/N Keyword**  **Old P/N Qty**  **Disposition** 1 L262M1808215 LH tu b e -- 1 A 1

-- LH tu b e L262M1808211 1 C 2 L262M1808216 R H tu be -- 1 A 2

-- R H tu be L262M1808212 1 C 3 L262M1814803 RH tube elbow -- 1 A 4 -- RH tube L262M1814101 1 D 5 L262M1815803 LH tu b e e l bow -- 1 A 5

-- LH tu b e e l bow L262M1815206 1 D 6 GBSM25--27/18SKW4 C l a m p -- 5 A 6

-- C l a m p DIN3017AL23--35C6--W4 4 C 7 L262M10X1202 Blanking cap -- 2 A 8 -- PU-lacquer (CM 478)
-- a.n.* B

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 6 of 15**  **REVISION 02, 2011-12-19 2011-03-24**  **No. Disposition**  **Qty Old P/N**  **Keyword New P/N**  9 -- Hardener (CM 479)
-- a.n.* B 10 -- Thinner (CM 480)
-- a.n.* B

**EFFECTIVITY S/N 0005 up to and including S/N 0869 for double engine fire** 

**extinguishing system for HC with**  **Air Conditioning System. Retrofit kit SB-135-26A-003-2C4, based on design document**  **L262M1813104. No.**  **New P/N Keyword**  **Old P/N Qty**  **Disposition** 1 L262M1808215 LH tu be -- 1 A 1

-- LH tu be L262M1808211 1 C 2 L262M1808216 R H tu b e -- 1 A 2

-- R H tu b e L262M1808212 1 C 3 L262M1814803 RH tube elbow -- 1 A 4 -- RH tube L262M1814101 1 D 5 L262M1815804 LH tu be e l bow -- 1 A 5

-- LH tu be e l bow L262M1815206 1 D 6 GBSM25--27/18SKW4 C l a m p -- 5 A 6

-- C l a m p DIN3017AL23--35C6--W4 4 C 7 L262M10X1202 Blanking cap -- 2 A 8 -- PU-lacquer (CM 478)
-- a.n.* B 9 -- Hardener (CM 479)
-- a.n.* B 10 -- Thinner (CM 480)
-- a.n.* B *a.n. = as needed **Disposition: A = New, included in kit.**  **B = Consumable material, to be ordered from the Interturbine company as needed.**  **CM item number i.a.w. list of consumable materials in the AMM**
**. C = Part with old P/N is discarded.**  **Discarded parts are not taken back by ECD. D = Remove the old P/N from the helicopter. Modify and re-iden**  **tify it i.a.w E. D. Material Necessary for Each Spare** 

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 7 of 15**  **2011-03-24 REVISION 02, 2011-12-19**  **Not applicable. E. Reidentified Parts**  **Using a vibrograph, write the new part numbers given below ne xt to the old part numbers**  **when this Alert Service Bulletin is accomplished: Component Old P/N New P/N**  **LH tube L262M1811801 L262M1811101 Tube (9, Figure 3)**  **L262M1815209 RH tube L262M1810101 L262M1810102**  **RH tube L262M1814101 L262M1814802 F. Special Tooling**  **Not applicable.**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 8 of 15**  **REVISION 02, 2011-12-19 2011-03-24**  **3. Accomplishment instructions A. Preliminary Work Steps:**  **NOTE As the plate of the airconditioning system blocks the access**  **to the LH**

**injection tube it, is required to either remove the plate or t o remove the rear**  **structure. (1) If an airconditioning system is installed on the helicop** **ter, either**  **(a) completely remove the plate i.a.w. AMM, 21-51-00, 4-1. or**  **(b) remove the rear structure i.a.w. AMM, 53-50-00, 4-1. If necessary remove the aft firewall i.a.w. AMM, 71-32-00, 4**  **-3. If necessary remove the airconditioning system from the eng**  **ine deck i.a.w. Figure 5.**  **(2) If the rear structure is not removed i.a.w. (1)(b): remov e battery i.a.w. AMM, 24-30-00,**  **1-1. (3) Mark the position of the cutting edges on the installed in**  **jection tubes i.a.w. Figure 2 / Figure 4.**  **(4) Remove the injection tubes i.a.w. AMM, 26-21-01, 4-3. If the rear structure was**  **removed [see (1)(b)] it might be better to additionally saw a part the LH injection tube**  **in the area of the firewall ( , Figure 2 / Figure 4).**  **B. Retrofit of the single engine fire extinguishing system: (1) Modify the injection tubes:**  **EFFECTIVITY S/N 0005 and S/N 0006.**  **(a) Discard LH (long) injection tube. Saw through RH (short) injection tube i.a.w**  **Figure 2 and discard the marked section ( ). Debur cutting edge of the other**  **section ( ).**  **EFFECTIVITY S/N 0007 up to and including S/N 0869.**  **(b) Saw through both injection tubes i.a.w Figure 2 and disca rd the marked**  **sections ( ). Debur cutting edges of the other sections (**  **). (2) Install the injection tubes:**  **(a) Install the new and modified injection tubes similar as g iven in AMM, 26-21-01, 4-3.**  **Differing from the details given in the AMM the following wor k steps must be**  **accomplished (see Figure 1):**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 9 of 15**  **2011-03-24 REVISION 02, 2011-12-19** 

**-- Slide clamp (3, Figure 1) onto tube (4) and carefully fit tu be elbow (2) and**  **tube (4) into one another ( ).**  **-- Slide clamp (3, Figure 1) onto tube (5) and carefully fit tu be elbow (6) and**  **tube (5) into one another ( ).**  **-- Connect tubes and tube elbows using clamp (3, Figure 1). To rque-tighten**  **clamps to 5--6 Nm. -- Close the tube (7) ends with blanking cap (8).**  **C. Retrofit of the double engine fire extinguishing system: NOTE**  **The procedure is effective for helicopters with and for heli copters without** 

**air conditioning system. (1) Modify the injection tubes i.a.w. Figure 4 and discard th**  **e marked sections ( ). Debur**  **the cutting edge of the section to be further used ( )**  **(2) Install the new and modified injection tubes similar as g iven in AMM, 26-21-01, 4-3 (see**  **Figure 3): -- Slide clamp (2) onto tube (8) and carefully fit tube elbow (** **7) and tube (8) into each other (**  **). -- Slide clamp (2) onto tube (1, 9) and carefully fit tube (1, 9** **) and tube elbow (3) into each other (**  **). -- Connect tubes and tube elbows with clamp (2). Torque-tigh**  **ten screws of the clamps to 5--6 Nm.**  **-- Close the ends of the tubes (4, 6) with the blanking cap (5). D. Conclusive work:**  **(1) If was previously removed, either**  **(a) Re-install plate i.a.w. AMM, 21-51-00, 4-1. or**  **(b) Re-attach airconditioning system to the engine deck i.a .w. Figure 5.**  **Re-install aft firewall i.a.w. AMM, 71-32-00, 4-3. Re-install rear structure i.a.w. AMM, 53-50-00, 4-1.**  **(2) If removed re-install the battery i.a.w. AMM, 24-30-00, 1-1.**  **E. Confirm accomplishment of this Alert Service Bulletin by an entry in the historical record of**  **the helicopter.** 

### 4. Appendix **Not applicable.**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 10 of 15**  **REVISION 02, 2011-12-19 2011-03-24**  

## Structural configuration of the injection tubes after modi **fication of the** 

**single engine fire extinguishing system:**

**S/N 0005 / 0006: Position of clamp ”B” on the**  **engine deck (see Figure 1). Clamp ”B”**  **New tubes Carefully put tubes into one another.** 

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 11 of 15**  **2011-03-24 REVISION 02, 2011-12-19** 

**Single Engine Fire Extinguishing System: Installation of I njection Tubes**  **Figure 1 1 Clamp GBSM21--23/18SKW4**  **DIN3017--A--16--27X9--W2--2 DIN3017AL16--27W2--1**  **2 RH tube elbow L262M1810802 3 Clamp GBSM21--23/18SKW4**  **4 RH tube L262M1810101 5 LH tube L262M1811801**  **6 LH tube elbow L262M1811803 7 Tube L262M1808207**  **8 Blanking cap L262M10X1201 After retrofit.**  **Before retrofit.**

**Modify component i.a.w. Figure 2 and re-identify with L262M 1810102.**  **Reuse components used previously.**

**1 3** 

**3**

**1 2**  **4**
**5**

**6 7**  **7** 

### A

**A**
**8 5--6 Nm** 

**5--6 Nm Detail**  

### A **Grounding strip Position of clamp ”**  **B ” in the engine deck for S/N 0005 and S/N 0006.** 



## B **Apply PU-lacquer (CM 478, 479, 480).** 
**Carefully fit tubes into one another. Modify component i.a.w. Figure 2 and re-identify with L262M**  **1811101.**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 12 of 15**  **REVISION 02, 2011-12-19 2011-03-24**  **Single Engine Fire Extinguishing System: Modification of I njection Tubes**  **Figure 2 Mark cutting edge here. Saw**  **through injection tube here and debur edge.**  **Discard this part. 49** **32**

**Measure dimension starting from the center line of the screw connection.**  **Illustration without scale. All dimensions in mm.** **Position of air conditioning system (see Figure 5)** 

**If necessary saw apart injection tube here in order to remove it.**  **Engine deck**
**LH RH** 

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 13 of 15**  **2011-03-24 REVISION 02, 2011-12-19** 

**Double Engine Fire Extinguishing System: Installation of I njection Tubes**  **Figure 3 1 LH tube elbow L262M1815207**  **2 Clamp GBMS25--27/18SKW4 DIN3017AL23--35C6--W4**  **3 LH tube elbow L262M1815804 L262M1815803**  **L262M1815206 4 LH tube L262M1808215**  **L262M1808211 5 Blanking cap L262M10X1202**  **6 RH tube L262M1808216 L262M1808212**  **7 RH tube elbow L262M1814803 8 RH tube L262M1814101**  **9 LH Tube Carefully fit tubes into one another.**  **After retrofit. Before retrofit.**  **Reuse components used previously.**  **Apply PU-lacquer (CM 478, 479, 480).** 

**1**

**2 5**  **2 8** 

**5--6 Nm 5--6 Nm**  **5**

**4 7**  **6**

**3**

**Detail** 

### A **Grounding strip**



### A

**A 9**  **Modify component i.a.w. Figure 4 and re-indentify with L262M1815209.** 

**For HC without**  **Air Conditioning System.**  **For HC with**  **Air Conditioning System.**  **Modify component i.a.w. Figure 4 and re-indentify**  **with L262M1814802.**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 14 of 15**  **REVISION 02, 2011-12-19 2011-03-24**  **Double Engine Fire Extinguishing System: Modification of I njection Tubes**  **Figure 4 Mark cutting edge here. Saw**  **through injection tube here and debur edge.**  **Measure dimension starting from the center line of the screw connection.**  **Discard this part. If necessary saw apart injection tube here in order to remove**  **it. Illustration without scale.**  **All dimensions in mm. 32,1**  **22,9 Engine deck** **Position of air conditioning system (see Figure 5)** 

**LH RH** 

**Re-use this part / section.**

# ALERT SERVICE BULLETIN **EC135**

**EC135-26A-003 PAGE 15 of 15**  **2011-03-24 REVISION 02, 2011-12-19**  **Detach Air Conditioning System Figure 5**  **Bolt (1x)**  **Screw (5x)**  **Washer Washer**  **The reason why the airconditioning system is shown as comple tely separated**  **from the engine deck in this Figure is to achieve a better unde rstanding.** 

**Air conditioning system**

**Engine deck**