# ALERT SERVICE BULLETIN EC135

EC135-67A-015 PAGE 1 of 8 2008-04-14 

## Rotor Flight Control – Cyclic Controls – Modification of Cyclic-Stick-Locking Device/-Centering Device 1. Planning Information A. Effectivity (1) Helicopters affected: EC135/EC635, all models, S/N 0005 up to and including S/N 0699, excluding S/N 0076, S/N 0093, S/N 0098, S/N 0099, S/N 0102, S/N 0104, S/N 0106, S/N 0108, S/N 0110, S/N 0111, S/N 0113, S/N 0114, S/N 0116, S/N 0117, S/N 0119. (2) Components affected: Cyclic Stick Locking Device L670M1045101 or L670M1045102 or L670M1045104 or L670M1045105 or L670M1045106 or L670M1045107 Pin L311M1038205 or L311M1099205 (3) Spare Parts affected: See 1.A.(2). B. Concurrent Requirements Immediately after accomplishment of this Alert Service Bulletin the pilots must be informed of its content and their attention must be drawn to the following: NOTE Before starting the engines, the cyclic stick (1, Figure 2) must be moved to its neutral position. By folding up cantilever (5) to pin (3) it is possible to move the cyclic stick (1) into its neutral position and to center it. A locking of the cyclic stick (1) is no longer possible. C. Reason There have been several cases where lift-off of a helicopter was executed with a locked cyclic stick. A locked cyclic stick may lead to a loss of controllability of the helicopter. In order to prevent an inadvertent lift-off of the helicopter with a locked cyclic stick, a modification of the cyclic stick cantilever is accomplished with this Alert Service Bulletin. After accomplishment of this modification the cyclic stick can only be centered in its neutral position. A locking of the cyclic stick is no longer possible. D. Description Remove slide and spring from cyclic stick cantilever.

# ALERT SERVICE BULLETIN EC135

EC135-67A-015 PAGE 2 of 8 2008-04-14 E. Compliance This Alert Service Bulletin must be accomplished by 31.07.2008 at the latest. F. Approval The information or instructions contained in this document refer to change no. 1311. The technical content of this document is approved under the authority of DOA No. EASA.21J.034. G. Manpower Approx. 2 man–hours. H. Weight and Balance Not applicable. I. Electrical Load Data Not applicable. J. Software Accomplishment Summary Not applicable. K. References Not applicable. L. Other Publications affected The changes to AMM EC135, AMM EC135/635 T1/T2 (CPDS), IPC EC135, IPC EC635 and FLM which are required as a result of this Alert Service Bulletin will be incorporated with one of the next revisions. M. Interchangeability of Parts Not applicable.

# ALERT SERVICE BULLETIN EC135

EC135-67A-015 PAGE 3 of 8 2008-04-14 2. Material Information A. Material – Price and Availability Information on cost and availability of required retrofit kit SB-135-67A-015-2C will be provided by ECD, Dept. Spares Order Administration on request. B. Support Information Not applicable. C. Material Necessary for Each Helicopter Retrofit kit SB-135-67A-015-2C. No. New P/N Keyword Old P/N Qty Disposition

1 L311M1038207 Rubber washer

− 1 A 2 LN91793208E Countersunk rivet

− 1 A 3 LN6504932M Washer

− 1 A 4
− Slide L670M1045208 1 B 5
− Spring L670M1045220 1 B 6

− Washer L670M1045217 2 B 7
− Washer L670M1045214 2 B 8

− Washer L670M1045211 2 B 9

− Blind rivet MBBN3013M3207 1 B 10

− Blind rivet MBBN3013M3206 1 B 11

− Dry cleaning solvent (CM 202) − a.n.* C
12

− Lacquer (CM 4012) − a.n.* C
13

− Hardener (CM 4013) − a.n.* C *a.n. = as needed Disposition: A = New, included in kit. B = Part with old P/N is discarded. Discarded parts are not taken back by ECD. C = Consumable material, to be ordered as required from the Interturbine company. CM item number i.a.w. list of consumable materials in the AMM. D. Material Necessary for Each Spare See Section 2.C.

# ALERT SERVICE BULLETIN EC135

EC135-67A-015 PAGE 4 of 8 2008-04-14 E. Reidentified Parts Not applicable. F. Special Tooling Not applicable. 

### 3. Accomplishment Instructions A. Preliminary work: (1) Remove cantilever (1, Figure 4) i.a.w. AMM, 67-11-00, 4-2. B. Modification of cantilever (1, Figure 1): (1) Using drill bit dia. 3.2 mm, drill out blind rivets (3, 4, Figure 1) from cantilever (1). Completely remove rivet remains. (2) Remove slide (5, Figure 1), spring (6) and washers (7, 8, 9) and discard. (3) Rivet pivot plate (2, Figure 1) to cantilever (1) using countersunk rivet (3) and washer (10). (4) Push rubber washer (6) over pin (3) i.a.w. Figure 2. C. Identification of the cantilever (1, Figure 3): (1) Remove all dirt and grease from the surface to be marked in the area of the part number on the inside of the cantilever (1, Figure 3) using dry cleaning solvent (CM 202). Leave the cleaned area to air. (2) Write the number of this Alert Service Bulletin onto the area near the part number on the inside of the cantilever (1, Figure 3) using a waterproof pen. (3) Protect the marking by lacquer (CM 4012, CM 4013). D. Conclusive works: (1) Install cantilever (1, Figure 4) i.a.w. AMM, 67-11-00, 4-2. (2) Fold the cantilever (1, Figure 4) towards the cyclic stick (2) and lock it to the cyclic stick by means of the rotary fastener (3). 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

EC135-67A-015 PAGE 5 of 8 2008-04-14 Modification of Cantilever Figure 1 1 Cantilever 2 Pivot plate 3 Blind rivet MBBN3013M3207 Countersunk rivet LN9179-3208E 4 Blindrivet 5 Slide 6 Spring 7 Washer 8 Washer 9 Washer 10 Washer LN65049-32M Before modification.

After modification.

Before modification. After modification. 1

2 3 4 5

6 7 8 9 8 7

2 1

3

10 

### Section 

## A–A

Section 

## B–B A A

B B

# ALERT SERVICE BULLETIN EC135

EC135-67A-015 PAGE 6 of 8 2008-04-14 Installation of Rubber Washer to Pin Figure 2 

## A

1 Cyclic stick 2 Bracket 3 Pin 4 Instrument panel 5 Cantilever 6 Rubber washer L311M1038207 Detail A 2

5 1

3

4 3

6 6

# ALERT SERVICE BULLETIN EC135

EC135-67A-015 PAGE 7 of 8 2008-04-14 Identification of Cantilever Figure 3 1 Cantilever L670M1045107 ASB EC135-67A-015

Possible P/N shown. Identification on the inside of the cantilever. Mark with the number of this Alert Service Bulletin. 1

# ALERT SERVICE BULLETIN EC135

EC135-67A-015 PAGE 8 of 8 2008-04-14 Cantilever Locking Figure 4 1 Cantilever 2 Cyclic stick 3 Rotary fastener 1 2

3