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

8 7 8 9

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