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.

This document is available on the internet: www.eurocopter.com/techpub
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

5--6 Nm 5X4

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

5--6 Nm 5X4

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:___________________