Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

Austria

DAI MSB 42-099/1

DAI MSB 42NG-035/1

Page 1 of 4

3-May-2013

MANDATORY SERVICE BULLETIN

MSB 42-099/1

MSB 42NG-035/1

supersedes MSB 42-099 & MSB 42NG-035

I TECHNICAL DETAILS

I.1 Category

Mandatory.

I.2 Airplanes affected

Type: DA 42, DA 42 M, DA 42 NG, DA 42 M-NG

Serial numbers: all

I.3 Date of effectivity

1-May-2013

I.4 Time of Compliance

Within 100 flight hours from the date of effectivity, but not later than 31-Dez-2013.

I.5 Subject

Inspection / replacement of spherical rod end bearing and safety washer of nose landing

gear (NLG) actuator, P/N X11-0006/2 with S/N 0155 and below. ATA-Code: 32-30

I.6 Reason

The safety washer at the NLG actuator s spherical rod end bearing originally installed on

actuators up to S/N 0155 might cause interference between safety washer and actuator

attachment lever at the NLG leg when the landing gear is retracted which bent the rod end

and in one case led to failure of the rod end due to cyclic loading. Two more rod ends with

an initiating crack at the threaded part were found. Due to the nearby steering linkage, a

failed rod end bearing with the LDG-switch in retracted position may cause interference with

the rudder control.

This Service Bulletin describes the work necessary to replace the spherical rod end bearing

and to replace the safety washer with one of the new design with reduced diameter in case

a safety washer of the old design was installed to the NLG actuator. 

I.7 Concurrent Documents

None.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

Austria

DAI MSB 42-099/1

DAI MSB 42NG-035/1

Page 2 of 4

3-May-2013

I.8 Approval

The technical content of this document has been approved under the authority of DOA ref. EASA.21J.052.

I.9 Accomplishments / Instructions

Identify and if required modify the NLG-actuator by complying with WI-MSB 42-099 / WI-MSB 42NG-035, latest effective issue. Do not install a NLG-actuator, P/N X11-0006/2 with S/N 0155 or below as a replacement

part unless modified in accordance with WI-MSB 42-099 / WI-MSB 42NG-035, latest

effective issue.

I.10 Mass (Weight) and CG

The change in mass and CG is negligible.

II PLANNING INFORMATION

II.1 Material and Availability

See WI-MSB 42-099 / WI-MSB 42NG-035, latest effective issue.

Materials are available from Diamond Aircraft Industries.

II.2 Special Tools

None.

II.3 Labour Effort

Inspection only: 0.5 hours

Replacement: approx. 2.5 hours

II.4 Credit

After performing the work and if replacement of safety washer or rod end bearing was

necessary:

Required material according to WI-MSB 42-099 / WI-MSB 42NG-035, latest effective issue.

II.5 Reference Documents

DA 42 Series Airplane Maintenance Manual, Doc. No. 7.01.01, latest effective issue.

DA 42 NG Airplane Maintenance Manual, Doc. No. 7.01.15, latest effective issue.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

Austria

DAI MSB 42-099/1

DAI MSB 42NG-035/1

Page 3 of 4

3-May-2013

III REMARKS

1. All work must be done by a certified aircraft service station or a certified aircraft

maintenance mechanic.

2. All work, particular those that are not especially described in this Service Bulletin, must

be done in accordance with the referenced Maintenance Manual.

3. Completion of all work must be recorded in the log book.

4. If material and/or labor hours are subject to be credited through Diamond Aircraft

Industries, the Service Bulletin must be performed by an authorized Diamond Service

Center within the time of compliance. The Warranty Application incl. Work Report must

be sent no later than 30 days after the performance of this Service Bulletin. 5. In case of doubt contact Diamond Aircraft Industries GmbH.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

Austria

DAI MSB 42-099/1

DAI MSB 42NG-035/1

Page 4 of 4

3-May-2013

EXECUTION REPORT TO

SERVICE BULLETIN

MSB 42-099/1

MSB 42NG-035/1

AIRPLANE DATA

Airplane Serial Number: _________________ Airplane Registration: _________________ Airplane Operator: _________________ Hours of operation of airplane: _________________ No. of landings: _________________ Hours of operation-engine: LH _________________ RH _________________ Typical operation of airplane: private, club, training, other ______________

Last maintenance: date & airplane TSN _________________ NLG-Actuator S/N installed: _________________

__________________________________ Date, Name, Sign

Please fax the completed form to Fax No. +43-2622-26700-1369 or e-mail to 

airworthiness@diamond-air.at
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-099

WI-MSB 42NG-035

Revision 1

Page 1 of 6

3-May-2013

WORK INSTRUCTION

WI-MSB 42-099

WI-MSB 42NG-035

I GENERAL INFORMATION

I.1 Subject

Inspection / replacement of spherical rod end bearing and safety washer of nose 

landing gear (NLG) actuator.

I.2 Reference Documents

DA 42 Series Airplane Maintenance Manual, Doc. No. 7.02.01, latest effective issue.

DA 42 NG Airplane Maintenance Manual, Doc. No. 7.02.15, latest effective issue.

I.3 Remarks

a) All work must be done by a certified aircraft service station or a certified aircraft

maintenance mechanic. 

b) All work, particular those that are not especially described in this work instruction, must be done in accordance with the referenced maintenance manual.

c) For conversion factors between SI and US/Imperial units refer to AMM Chapter 02.

d) It is recommended to print this Work Instruction in color.

e) In case of doubt, contact Diamond Aircraft Industries GmbH.

II DRAWINGS, SPECIAL TOOLS & MATERIALS

II.1 Drawings

None.

II.2 Special Tools

None.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-099

WI-MSB 42NG-035

Revision 1

Page 2 of 6

3-May-2013

II.3 Material

Quantity Part No. Description

1 X11-0006-SMRCD10IRMR.7403

or

X11-0006-GARSW-10RR (hls/fluro)

spherical rod end bearing

a. r. X11-0006-00-00.02, Rev B safety washer (diameter 24 mm)

1 X11-0006-00-00.98 modification sticker & protection foil

Materials are available from Diamond Aircraft Industries.

II.4 Consumables

Quantity Part No. Description

a. r. - Stainless steel safety wire - Ø 0,032 inch

a. r. - zinc chromate primer

a. r. - lacquer

a. r. i.a.w. AMM, section 12-30 anti corrosion coating

Consumables may be procured locally or from Diamond Aircraft Industries

III INSTRUCTIONS

1

Identify part number (P/N) and serial number (S/N) of nose landing gear (NLG) actuator (use inspection mirror). NOTE: NLG actuators with P/N X11-0006/2A are not affected by this Service Bulletin.

 safety washer

rod end bearing
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-099

WI-MSB 42NG-035

Revision 1

Page 3 of 6

3-May-2013

2 If NLG actuator has P/N X11-0006/2 and S/N is 0156 or higher, proceed with item 12. 3

If NLG actuator has P/N X11-0006/2 and S/N is 0155 or lower remove NLG actuator

from the aircraft in accordance with AMM, section 32-20.

NOTE: It is not necessary to remove the actuator completely from the aircraft. The following work can be done with the actuator remaining connected

to the NLG brace assembly and to the hydraulic system.

4 Remove spherical rod end bearing from the NLG actuator piston in accordance with

AMM, section 32-30. Discard spherical rod end bearing.

5

Measure diameter of safety washer. Possible diameters are: - 27 mm (old design, picture on the left)

- 24 mm (P/N X11-0006-00-00.02, Rev B, new design, picture on the right).

 6

If diameter of safety washer is 27 mm replace it with one of the new design with 4 holes 

for lock wire and with reduced diameter of 24 mm, P/N X11-0006-00-00.02, Rev B. 7 Re-assemble NLG actuator with a new spherical rod end bearing, in accordance with

AMM, section 32-30.

old design new design

27 mm 24 mm
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-099

WI-MSB 42NG-035

Revision 1

Page 4 of 6

3-May-2013

8

Secure the counter nut with lock wire. Route the lock wire through both holes on one

side of the safety washer, as shown in the picture. Lock wire must not be routed over

the circumferential edges of the safety washer as lock wire might reduce clearance

between safety washer and actuator attachment lever at the NLG leg.

9

Complete information on sticker with date and name of maintenance organization. 

Clean area of the sticker s size on the NLG actuator with clean and fresh acetone and

apply it to the NLG actuator. Cover sticker with transparent protection foil.

 10 Reinstall NLG actuator in accordance with AMM, section 32-30. 11 Apply anti-corrosion coating on actuator connections in accordance with AMM, section 12-30.

modified acc. to

MSB 42-099 / MSB 42NG-035

Safety Washer replaced by

P/N X11-0006-00-00.02, Rev B

Date: ______________

Name: ______________

safety washer
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-099

WI-MSB 42NG-035

Revision 1

Page 5 of 6

3-May-2013

12

Examine actuator attachment lever at the NLG leg. In case marks originating from

interference with the safety washer are found, apply zinc chromate primer to the

interference marks and seal with appropriate lacquer, refer to manufacturer s 

specifications.

 13 Clean working area and check for foreign objects.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-099

WI-MSB 42NG-035

Revision 1

Page 6 of 6

3-May-2013

14

Carry out a landing gear extension and retraction test in accordance with AMM, section

32-30 and check for positive clearance between NLG actuator safety washer and

actuator attachment lever at the NLG leg when the landing gear is retracted (use

inspection mirror).

If there is no positive clearance between NLG actuator safety washer and actuator

attachment lever at the NLG leg, check adjustment of NLG actuator length according to 

AMM, section 32-20. In case no positive clearance can be adjusted, contact Diamond

Aircraft Industries GmbH. 15 Perform functional check of altered, repaired and new parts.

16 Test all systems in working area for function.

17 Make necessary entries into aircraft logs. 18 Fill in execution report and send it to Diamond Aircraft Industries via Fax 

to +43-2622-26700-1369 or email to airworthiness@diamond-air.at. positive clearance