# EC135 

# ALERT SERVICE BULLETIN Fuselage - Cable Channel - Inspection of wire harnesses and modification of side channel covers 1. Planning Information A.



### B. 

## c. Effectivity (1) Helicopters affected: (2) Components affected: (3) Spare parts affected: 

### Concurrent Requirements Not applicable . 

### Reason EC135/EC635, all models S/N 0005 up to and including 

# I S/N 0576. Wire harnesses in the LH and RH cable channel. Not applicable .

During a flight a burning odor could be smelt in the cabin. Its reason was a short circuit in the LH cable channel, which was caused by a damaged wire harness. The wire harness was damaged by the side channel cover's attachment hardware . For this reason, a modified attachment of the side channel cover is introduced with this Alert Service Bulletin . 

### D. Description Inspect wire harnesses in the LH and RH cable channel for chafing, remove screws and anchor nuts from the area where the side channel covers overlap and replace by a double-sided adhesive tape. 

### E. Compliance Inspection of the wire harnesses and accomplishment of the chafing protection measures must be accomplished within the next 25 fh after receipt of th is Alert Service Bulletin , but by 28 .02 .2007 at the latest. F. 

### Approval The technical content of this document is approved under the authority of DOA No. EASA.21 J.034.



### 2007-01-18 EC135-53A-017 

### PAGE 1 of 10 REVISION 01, 2007-06-22

# ~~[2fopter EC135 

# ALERT SERVICE BULLETIN G. Manpower EFFECTIVITY Helicopters with collective lever cover (copilot). Approx. 5 man- hours. EFFECTIVITY Helicopters without collective lever cover (copilot). Approx. 

### 4 man-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 T1/T2 (CPOS). L 

### Other Publications affected The changes to AMM EC135, AMM EC 135/635 T1/T2 (CPOS) and to IPC EC135, IPC EC635 wich are required as a result of thie Alert Service Bulletin will be incorporated with one of the next revisions. M. Interchangeability of Parts Not applicable. 

### 2. Material Information A. Material - Price and Availability Information on cost and availability of required retrofit kit SB-135-53A-017-2C1 or SB-135-53A-017-2C2 will be provided by ECD, Dept. Spares Order Administration on request. B. Support Information Not applicable. EC135-53A-017 PAGE 2 of 10 2007-01-18 REVISION 01, 2007-06-22

# EC135 

# ALERT SERVICE BULLETIN C. Material Necessary for Each Helicopter

No.



### 1 2 EFFECTIVITY Helicopters without collective lever cover (copilot) . Retrofit kit SB-135-53A-017-2C1 New P/N Keyword Old P/N



## - Adhesive tape (double-sided) 

## - (CM 6049)



### - Acetone (CM 203) 

## - *a.n. =as needed

No.



### 1 2 3 4 EFFECTIVITY Helicopterswith collective lever cover (copilot). Retrofit kit SB-135-53A-017-2C2 New P/N Keyword Old P/N 15147.{)5-20Farbe1002 Hook tape 

### -

Klettostar·Haftband (0.6m) 15244-05-20Farbe1002 Pile tape 

## - Klettostar-Fiauschband (0.6m)



## - Adhesive tape (double-sided) 

## - (CM 6049)



### - Acetone (CM 203) 

## - *a.n. =as needed Disposition: A= New, included in kit. Qty Disposition a.n.* B a.n.* B

Qty Disposition



### 1 A 

### 1 A a.n .• B a.n.• B

B = Consumable material , to be ordered from the lnterturbine company as needed. CM item number i.a.w. list of consumable materials in the AMM . 

### D. Material Necessary for Each Spare Not applicable. 

### E. Reidentified Parts Not applicable. 

### F. Special Tooling Not applicable.



### 2007-01-18 REVISION 01, 2007-06-22 EC135-53A-017 PAGE 3 of 

### 10

# -~~[8fOPter EC135 

# ALERT SERVICE BULLETIN 3. Accomplishment Instructions A. Preliminary work steps: (1} De-energize helicopter electrical system i.a.w. AMM, 24-00-00, 2-1. (2) If present, remove floor cover from the area of the LH and RH side channel covers i.a.w. AMM, 25-10-00, 4-2 . (3} If present, remove cover from collective lever (copilot) i.a.w. AMM, 67-12-00, 4-8. (4) Remove LH and RH side channel covers i.a.w. AMM, 52-50-00 , 4-3. 

### B. Inspection of wire harnesses in the LH and RH cable channel : (1) Inspect wire harnesses i.a.w. Figure 1 for chafing and damage and, while doing so, especially inspect the area beneath the attachment screws of the side channel covers. If wire harnesses are damaged , contact the ECD customer service before the next flight for further instructions. 

### (2) If additional items of optional equipment are installed on the side channel covers, inspect beneath lying wire harnesses and contact the ECD customer service in case of doubt. (3} If no signs of damage can be detected in the wire harnesses, proceed i.a.w. Section 3.C of this Alert Service Bulletin . · C. Modification of the side channel covers: NOTE The following instructions are effective for the LH cable channel. The instructions for the RH cable channel are identical. (1) If present, remove foam rubber (5, Figure 2). (2) Drill out countersunk rivets (1 , Figure 2} using drill bit dia. 2.4 mm . (3) Remove two anchor nuts (4, Figure 2) and sheet (3). (4) Affix double-sided adhesive tape (6, Figure 2) onto side channel cover (2). By doing so , remove protective backing film not until side channel cover (2} and side channel cover (7) are installed. Clean areas to be affixed before affixing of the double-sided adhesive tape with acetone (CM 203} .



### EC135-53A-017 PAGE 4 

### of 10 2007-01-18 REVISION 

### 01, 2007-06-22

# EC135 

# ALERT SERVICE BULLETIN EFFECTIVITY For helicopters with collective lever cover (copilot) . D. Modification of the attachment of the collective lever cover (copilot) : (1) Drill out rivets (6) from the side channel cover (4, Figure 3} using drill bit dia. 2.4 mm. (a) Remove the two anchor nuts (5, Figure 3}. (b) Attach hook-and-pile tape (8, 10, Figure 3) onto the cover (3): 

### 1 Clean bonding surfaces of the side channel cover (4, Figure 3) with acetone (CM 203} . 

### 2. Mark position of the pile tape (1 0, Figure 3) onto the side channel cover (4) . ;1 Peel off protective backing strip of the pile tape (1 0, Figure 3} and affix pile tape (1 0) to the side channel cover (4) . 

### .1. Clean bonding surfaces of the cover (3, Figure 3) of the collective lever (copilot) with acetone (CM 203) . Q. Peel off protective backing strip of the hook tape (8, Figure 3} and affix hook tape (8) to the cover (3) . EFFECTIVITY All. 

### E. Attach chafing protection (e.g. ROUNDIT2000NX, chafing protection must correspond to Aviation Standard) over the wire harnesse in the RH and LH cable channel. Inspect installation position of the wire harnesses and , if necessary, correct: (1) Attach chafing protection (7, Figure 

### 4) over the wire harnesses (2) wh ich are next to the anchor nuts (3) and attach by means of ty-raps (5). (2) If the clearance between anchor nuts (3, Figure 4) , screws (4) and the wire harnesses (2) is less than 

### 4 mm, route wire harnesses until the specified minimum clearance of 

### 4 mm is reached and then fix wire harnesses (2) by means of ty- raps (5). F. Conclusive work: CAUTION PAY ATTENTION THAT THE SPECIFIED SCREWS ARE USED FOR INSTALLATION OF THE SIDE CHANNEL COVERS, AS TOO LONG SCREWS MAY DAMAGE THE BENEATH LYING WIRE HARNESSES. (1) Install LH and RH side channel cove rs i.a.w. AMM , 52-50-00 , 4-3. By doing so , pay attention to the modified attachment of the side channel covers by a double-sided adhesive tape i. a.w. Section 3.C. If other screws than screws LN9136-05012 are used in the places of Figure 4 which are marked with an "X", replace screws accordingly. EFFECTIVITY For helicopters with collective lever cover (copilot) . (2) Install collective lever cover (copilot) i.a.w. AMM, 67-12-00, 4-8. By doing so, pay attention to the modified attachment of the cover by hook-and-pile tapes i.a.w. Section 

### 3.0 and replace the two remaining screws with screws LN9139M4X16. 

### 2007-01-18 REVISION 01 , 2007-06-22 EC135-53A-017 

### PAGE 5 

### of 10

# -~~ra~,s::opter EC135 

# ALERT SERVICE BULLETIN EFFECTIVITY All. (3) If removed , install floor cover i.a.w. AMM, 25-10-00, 4-2. G. Confirm accomplishment of this Alert Service Bulletin by an entry in the historical record of the helicopter. 

### 4. Appendix Not applicable.



### EC135-53A-017 PAGE 6 

### of 10 2007-01-18 REVISION 01, 2007-06-22

# -~~LSvcopter EC135 

# ALERT SERVICE BULLETIN

dLIGHT DIRECTION



# & Inspect wire harnesses fo r chafing and damage . By doing so, especially inspect the area where the side channel covers are screwed .



### 2007-01-18 REVISION 01, 2007-06-22 Inspection of Wire Harnesses Figure 1



### EC135·53A-o17 

### PAGE 7 of 10

# EC135 

# ALERT SERVICE BULLETIN

7



### 1 Countersunk rivet 2 

### Side channel cover& 

### 3 Sheet 4 

### Anchot nut 

### 5 Foam rubber View 

### A

6 

### Double-sided adhesixe tape (CM 6049) 

### 7 Side channel cover

**~** 

### & only LH 

### side channel cover is shown .



### EC135-53A-017 PAGE 8 of 10 Modification of Side Channel Cover Figure 

### 2

2007-01-18 REVISION 01, 2007-06-22

# EC135 

# ALERT SERVICE BULLETIN Before modification.



### 4 After modification .

1 Screw & 

### 2 Washer& 

### 3 Cover 

### 4 Side channel cover 

### 5 Anchor nut& 

### 6 Rivet & 

### 7 Screw 

### 8 Hook tape £ 9 

### Washer 10 

### Pile tape 

## & 

# ffi Before modification . ffi Atter modification . 

# & Establish screw holes into the pile tape.

Modification of Collective Lever Cover (Copilot) · Figure 

### 3

2007-01-18 REVISION 01, 2007-06-22 9X2



### 10

EC135-53A-Q17 PAGE 9 of 10

# ·~~fo~n?opter EC135 

# ALERT SERVICE BULLETIN

Cable channel 2 Wire harness 

## & 3 Anchor nut 4 Screw 

## & 5 Ty-rap 

## & 6 Side channel cover 

### 7 Chafing protection (e.g. ROUNDIT2000NX) 

## & Section 

## A-A

3 

# illTypical routing of the wire harnesses in the cable channel. 7 

# & The minimum clearance between wire harnesses and anchor nuts/screws must be 

### 4 mm. 

# & If necessary, route wire harnesses by additionally fixing them with ty-raps. 

# ffiAttach a chafing protection over wire harnesses. 

# & If other screws than screws LN9136-05012 are used in the places of Figure 4 which are marked with an "X", replace screws accordingly.



### EC135-53A-017 PAGE 

### 10 of 

### 10 Installation Position of Wire Harnesses Figure 4



### 2007-01-18 REVISION 

### 01 I 

### 2007-06-22