# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 1 of 10 2008-05-13 REVISION 1, 2013-01-28 

## Auto Flight System -- Longitudinal, Lateral and Yaw Actuator -- Check **SEMA/control rod for correct attachment hardware 1. Planning Information**  **A. Effectivity** (1) Helicopters affected: EC135/EC635, all models. (2) Components affected: Control rod L221M1041101 L221M1041102 L221M1041104 Control rod with actuator L221M1046101 L221M1046102 YAW-actuator L672M2005101 L672M2005102 L672M2005103 L672M2005104 Dual YAW-actuator L221M1047101 L221M1047102 L221M1047103 L221M1047104 (3) Spare parts affected: Not applicable. **B. Concurrent Requirements** Not applicable. **C. Reason** During the installation work on a helicopter, it has been detected that it was not possible to establish attachment hardware on a threaded blind borehole between SEMA (Smart Electro Mechanical Actuator) and the control rod without play. The reason for this loose attachment hardware was an unfavourable adding of the tolerances of the attachment hardware elements. The result of this was that the screw first pushed against the bottom of the threaded blind borehole on the SEMA so that no clamping effect on the screw head could be achieved. Therefore, this Alert Service Bulletin prescribes the check of the affected SEMAs for attachment hardware that is connected to the respective control rod without play and, if necessary, the establishment of a connection that is free from play. **D. Description** Check attachment hardware between SEMAs and control rods. If necessary, loosen attachment hardware and establish attachment hardware that is free from play.
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# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 2 of 10 REVISION 1, 2013-01-28 2008-05-13 **E. Compliance** (1) The check and the possibly required correction of the attachment hardware connection i.a.w. Section 3 must be accomplished within the next 50 fh after receipt of this Alert Service Bulletin. (2) If SEMAs and control rods must be screwed together in future, it must be ensured that the attachment hardware connections must be established without play i.a.w. Section 3 of this Alert Service Bulletin. **F. Approval** The technical content of this document is approved under the authority of DOA No. EASA.21J.034. **G. Manpower** Approx. 2 man--hours for check of attachment hardware. **H. Weight and Balance** Not applicable. **I. Electrical Load Data** Not applicable. **J. Software Accomplishment Summary** Not applicable. **K. References** AMM EC135 and AMM EC135/635. **L. Other publications affected** The changes to IPC EC135, IPC EC635 will be incorporated with one of the next revisions. **M. Interchangeability of Parts** Not applicable.

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 3 of 10 2008-05-13 REVISION 1, 2013-01-28 **2. Material Information A. Material -- Price and Availability**  The possibly necessary washers EN2139-05016 and screws ISO4762-M5X16-A2-70 must seperately ordered by ECD. **B. Support Information** Not applicable. **C. Material Necessary for Each Helicopter** Not applicable. **D. Material Necessary for Each Spare** Not applicable. **E. Reidentified Parts** Not applicable. **F. Special Tooling** Not applicable.

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 4 of 10 REVISION 1, 2013-01-28 2008-05-13 **3. Accomplishment Instructions**

List of contents: A. Installation locations of the actuators. B. Check of longitudinal actuator. C. Check of lateral actuator. D. Check of yaw actuator. E. Conclusive work. A. Installation locations of the actuators: (1) Figure 1 describes the installation locations of the actuators. B. Longitudinal actuator (1, Figure 1): (1) Remove front roof panelling i.a.w. AMM, 25-20-00, 4-1. (2) Check attachment hardware between SEMA (3, Figure 2) and control rod (2): (a) Check manually or with a suitable aid, whether the washers (4, , Detail A, Figure 2) can be moved. 1 If the two washers (4, ) cannot be moved, install front roof panelling i.a.w. AMM, 25-20-00, 4-1. 2 If one or both washers (4, ) can be moved, remove **all four** screws (5) and discard. Store all four washers (4) for reuse and proceed as follows: a Connect SEMA (3, Detail B, Figure 2) and control rod (2) with four **new** screws (5), the old four washers (4) and **two** additional washers (6, ). Torque--tighten screws to 5--6 Nm. b Install front roof panelling i.a.w. AMM, 25-20-00, 4-1. C. Lateral actuator (2, Figure 1): (1) Remove transmission fairings i.a.w. AMM, 71-11-00, 4-4. (2) Check attachment hardware between SEMA (1, Figure 2) and control rod (2). (a) Check manually or with a suitable aid, whether the washers (4, , Detail A, Figure 2) can be moved. 1 If both washers (4, ) cannot be moved, install transmission fairing i.a.w. AMM, 71-11-00, 4-4. 2 If one or both washers (4, ) can be moved, remove **all four** screws (5) and discard. Store all four washers (4) for reuse and proceed as follows: a Connect SEMA (1, Detail B, Figure 2) and control rod (2) with four **new** screws (5), the old four washers (4) and **two** additional washers (6, ). Torque--tighten screws (5) to 5--6 Nm. b Install transmission fairing i.a.w. AMM, 71-11-00. 4-4.

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 5 of 10 2008-05-13 REVISION 1, 2013-01-28 D. Yaw actuator (3, Figure 1): (1) If installed, remove Fenestron transmission cover i.a.w. AMM, 52-40-00, 4-6. (2) Remove lower cover from Fenestron structure i.a.w. AMM, 52-40-00, 4-6. (3) Check attachment hardware between SEMA (1, Figure 3 or 4) and control rod (2): (a) Check manually or with a suitable aid, whether washers (3, , Detail A, Figure 3 or 4) can be moved. 1 If the two washers(3, ) cannot be moved, install lower cover on Fenestron structure i.a.w. AMM, 52-40-00, 4-6 and install Fenestron transmission cover i.a.w. AMM, 52-40-00, 4-6. 2 If one or both washers (3, ) can be moved, remove all four screws (5) and discard. Store all four washers (3) for reuse and proceed as follows: a Connect SEMA (1, Detail B, Figure 3 or 4) and control rod (2) with four **new** screws (5), the old four washers (3) and **two** additional washers (4, ). Torque--tighten screws (5) to 5--6 Nm. b Install lower cover on Fenestron structure i.a.w. AMM, 52-40-00, 4-6. c If removed, install Fenestron transmission cover i.a.w. AMM, 52-40-00, 4-6. E. Conclusive work: (1) Confirm accomplishment of this Alert Service Bulletin by an entry in the historical record of the helicopter. (2) If loose washers are detected, copy reply form sheet on page 10, fill out and send to ECD customer support. 

### 4. Appendix Not applicable.

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 6 of 10 REVISION 1, 2013-01-28 2008-05-13 Installation Locations of Actuators

Figure 1 1 Longitudinal actuator 2 Lateral actuator 3 Yaw actuator 1 2

3 3

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 7 of 10 2008-05-13 REVISION 1, 2013-01-28 Longitudinal and Lateral Actuator Figure 2 1 SEMA (lateral actuator) 2 Control rod 3 SEMA (longitudinal actuator) 4 Washer LN29932-05 5 Screw ISO4762-M5X16-A2-70 6 Washer EN2139-05016 Check, whether the two washers can be moved. If necessary, install one addtional washer (6) on each of these two screws. 

## A **A**

Detail 

## A

Detail 

## B (with additional washers) 1 2 2 3 FLIGHT DIRECTION

1,3 4 4 1,3

6 5--6 Nm 5X4 2

2 4 4

6

5X4 4X4

@@

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 8 of 10 REVISION 1, 2013-01-28 2008-05-13 Yaw Actuator (with AFCS)

Figure 3 1 SEMA (yaw actuator) 2 Control rod 3 Washer LN29932-05 4 Washer EN2139-05016 5 Screw ISO4762-M5X16-A2-70 Check, whether the two washers can be moved. If necessary, install one additional washer (4) on each of these two screws. FLIGHT DIRECTION 1

1 2 

### Detail 

## A

Detail 

## B (with additional washers)
1 3 1 3X4 4

5X4 5--6 Nm 

## A
**A** 2

2 5X4 3 3

4

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 9 of 10 2008-05-13 REVISION 1, 2013-01-28 Yaw Actuator (without AFCS) Figure 4 1 SEMA (yaw actuator) 2 Control rod 3 Washer LN29932-05 4 Washer EN2139-05016 5 Screw ISO4762-M5X16-A2-70 Check, whether the two washerrs can be moved. If necessary, install one additional washer (4) on each of these two screws. FLIGHT DIRECTION



### Detail 

## A

Detail 

## B (with additional washers) 

## A

3 1 2 1

1

3X4 4

5X4 5--6 Nm 2

2 5X4

4

# ALERT SERVICE BULLETIN **EC135**

**EC135-22A-015** PAGE 10 of 10 REVISION 1, 2013-01-28 2008-05-13 

# Telefax

Longitudinal actuator Helicopter S/N: **Actuator affected**

**Please copy page! Original page remains in the Alert Service Bulletin!** Lateral actuator Yaw actuator **Reply form sheet for ASB EC135-22A-015 ”Check SEMA/control rod for correct attachment hardware”**  Please completely fill out reply form sheet and send to the given FAX No. To Eurocopter Deutschland GmbH Customer Support FAX 0049 906 714111 Address of operator:

Disposition:

Date:__________ Signature:___________________