SERVICE BULLETIN

EC135

CHANGE INSTRUCTION NO. 2 FOR EC135-26A-003

2011-12-19 PAGE 1 of 1

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 extinguishing system

Tkz. L262M1808101)a, L262M1812101)b and

L262M1812102)c.

Installed only on helicopters of the BPOL:

Double engine fire extinguishing 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 extinguishing system:

RH tube L262M1810101

LH tube L262M1811801 / L262M1809101

For double engine fire extinguishing 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
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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.
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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) instead 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.
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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 kit 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 free of cost only when the

incoming order is received by October 31, 2011. Material kits ordered after October 31, 2011

will be charged with the ruling prices.

Information Notice IN 2372-I-26 has been issued by Eurocopter 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 system.

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 tube

-- 1 A

4

--

LH tube

L262M1809101 1 C

5

GBSM21--23/18SKW4

Clamp

-- 4 A

5

--

Clamp

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 extinguishing

system.

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

-- 1 A

1

--

LH tube

L262M1808211 1 C

2

L262M1808216

RH tube

-- 1 A

2

--

RH tube

L262M1808212 1 C

3 L262M1814803 RH tube elbow -- 1 A

4 -- RH tube L262M1814101 1 D

5

L262M1815803

LH tube elbow

-- 1 A

5

--

LH tube elbow

L262M1815206 1 D

6

GBSM25--27/18SKW4

Clamp

-- 5 A

6

--

Clamp

DIN3017AL23--35C6--W4 4 C

7 L262M10X1202 Blanking cap -- 2 A

8 -- PU-lacquer (CM 478) -- a.n.* B
ALERT SERVICE BULLETIN

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PAGE 6 of 15 REVISION 02, 2011-12-19

2011-03-24

No. New P/N Keyword Old P/N Qty Disposition

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 tube

-- 1 A

1

--

LH tube

L262M1808211 1 C

2

L262M1808216

RH tube

-- 1 A

2

--

RH tube

L262M1808212 1 C

3 L262M1814803 RH tube elbow -- 1 A

4 -- RH tube L262M1814101 1 D

5

L262M1815804

LH tube elbow

-- 1 A

5

--

LH tube elbow

L262M1815206 1 D

6

GBSM25--27/18SKW4

Clamp

-- 5 A

6

--

Clamp

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-identify it i.a.w E.

D. Material Necessary for Each Spare
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PAGE 7 of 15

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REVISION 02, 2011-12-19

Not applicable.

E. Reidentified Parts

Using a vibrograph, write the new part numbers given below next 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.
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PAGE 8 of 15 REVISION 02, 2011-12-19

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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 to remove the rear

structure.

(1) If an airconditioning system is installed on the helicopter, 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 engine deck i.a.w.

Figure 5.

(2) If the rear structure is not removed i.a.w. (1)(b): remove battery i.a.w. AMM, 24-30-00,

1-1.

(3) Mark the position of the cutting edges on the installed injection 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 apart 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 discard 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 given in AMM, 26-21-01, 4-3.

Differing from the details given in the AMM the following work steps must be

accomplished (see Figure 1):
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REVISION 02, 2011-12-19

-- Slide clamp (3, Figure 1) onto tube (4) and carefully fit tube elbow (2) and

tube (4) into one another ( ).

-- Slide clamp (3, Figure 1) onto tube (5) and carefully fit tube elbow (6) and

tube (5) into one another ( ).

-- Connect tubes and tube elbows using clamp (3, Figure 1). Torque-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 helicopters without

air conditioning system.

(1) Modify the injection tubes i.a.w. Figure 4 and discard the marked sections ( ). Debur

the cutting edge of the section to be further used ( )

(2) Install the new and modified injection tubes similar as given 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-tighten 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.
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Structural configuration of the injection tubes after modification of the

single engine fire extinguishing system:

S/N 0005 / 0006:

Position of clamp ”B” on the

Clamp ”B” engine deck (see Figure 1).

New tubes

Carefully put tubes into one another.
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2011-03-24

REVISION 02, 2011-12-19

Single Engine Fire Extinguishing System: Installation of Injection 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 L262M1810102.

Reuse components used previously.

1

3

3

1

2

4

5

6

7

7

A

A

8

5--6 Nm

Detail A 5--6 Nm

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 L262M1811101.
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PAGE 12 of 15 REVISION 02, 2011-12-19

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Single Engine Fire Extinguishing System: Modification of Injection 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
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REVISION 02, 2011-12-19

Double Engine Fire Extinguishing System: Installation of Injection 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

6 7

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.
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Double Engine Fire Extinguishing System: Modification of Injection 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.
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REVISION 02, 2011-12-19

Detach Air Conditioning System

Figure 5

Screw (5x) Bolt (1x)

Washer Washer

The reason why the airconditioning system is shown as completely separated

from the engine deck in this Figure is to achieve a better understanding.

Air conditioning system

Engine deck