Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

Austria

DAI MSB 42-095

DAI MSB 42NG-026

Page 1 of 4

11-Nov-2011

MANDATORY SERVICE BULLETIN

MSB 42-095

MSB 42NG-026

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: 42.004 through 42.321, 42.324 through 42.347,

42.349, 42.351, 42.353 through 42.357, 

42.359 through 42.386, 42.388, 42.389, 42.391, 

42.394, 42.396, 42.399, 42.405 through 42.409, 

42.412 through 42.416, 42.427,

42.AC001 through 42.AC152,

42.M001 through 42.M011, 42.M015 through 42.M019,

42.M021, 42.M022,

42.N001 through 42.N011, 42.N013, 42.N018, 42.N019, 

42.N023 through 42.N028,

42MN001 through 42.MN008

provided that damper D60-3277-10-00_01 has NOT been installed

on both MLG legs

I.3 Date of effectivity

11-Nov-2011

I.4 Time of Compliance

Within 200 flight hours, but not later than 31-Dec-2012.

I.5 Subject

Replacement of MLG damper nut.

ATA-Code: 32-10

I.6 Reason

In one case the nut in the MLG damper has loosened itself during operation. This might lead 

to the MLG leg getting jammed in the gear bay. This Service Bulletin describes the work 

necessary to secure the nut in the MLG damper.

Note: Diamond Aircraft Industries recommends doing RSB 42-089 / RSB 42NG-017. The 

measures prescribed by this service bulletin are included in RSB 42-089 / RSB 

42NG-017.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

Austria

DAI MSB 42-095

DAI MSB 42NG-026

Page 2 of 4

11-Nov-2011

I.7 Concurrent Documents

None.

I.8 Approval

The technical information or instructions contained in this document relate to the Design 

Change Advisory No. MÄM 42-434, which has been approved under the authority of EASA 

Design Organization Approval ref. EASA.21J.052.

The technical content of this document has been approved under the authority of DOA ref. 

EASA.21J.052.

I.9 Accomplishments / Instructions

If RSB 42-089 / RSB 42NG-017 has been done on both MLG dampers:

Record MSB 42-095 / MSB 42NG-026 as performed.

Note: Doing RSB 42-089 / RSB 42NG-017 on both MLG dampers is included in Work 

Instruction “Conversion to DA 42 NG / M-NG” Rev. 7 and later.

If RSB 42-089 / RSB 42NG-017 has not been done on both MLG dampers:

Comply with WI-MSB 42-095 / MSB 42NG-026, latest effective issue.

Note: WI-MSB 42-095 / MSB 42NG-026 is attached to this document.

Note: Diamond Aircraft Industries recommends to do RSB 42-089 / RSB 42NG-017 on 

both MLG dampers. The measures prescribed by this service bulletin are included 

in RSB 42-089 / RSB 42NG-017.

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 42-095 / MSB 42NG-026, latest effective issue.

Materials including drawings are available from Diamond Aircraft Industries.

II.2 Special Tools

None.

II.3 Labour Effort

Approx. 2 hours.

II.4 Credit

For all AC within warranty period:

2 man hours of work.

Material according to WI-MSB 42-095 / MSB 42NG-026, latest effective issue.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

Austria

DAI MSB 42-095

DAI MSB 42NG-026

Page 3 of 4

11-Nov-2011

II.5 Reference Documents

Diamond Aircraft DA 42 Series Airplane Maintenance Manual, Doc. No. 7.01.01, latest 

effective issue.

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

issue.

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 carried out by an authorized Diamond Service 

Center and the Warranty Application incl. Work Report must be sent not later than 30 

days after the end of time of compliance.

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 42-095

DAI MSB 42NG-026

Page 4 of 4

11-Nov-2011

EXECUTION REPORT TO

SERVICE BULLETIN

MSB 42-095

MSB 42NG-026

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 ______________

__________________________________

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 42-095

WI-MSB 42NG-026

Revision 0

Page 1 of 4

11-Nov-2011

WORK INSTRUCTION

WI-MSB 42-095 / WI-MSB 42NG-026

Replacement of self-locking nut in MLG damper

I GENERAL INFORMATION

I.1 Subject

Replacement of nut in MLG damper

I.2 Reference Documents

Diamond Aircraft DA 42 Series Airplane Maintenance Manual, Doc. No. 7.02.01, latest 

effective issue.

Diamond Aircraft 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

D60-3277-10-00_01

II.2 Special Tools

Spacer X00-W027-00-00.02 Rev."-"
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-095

WI-MSB 42NG-026

Revision 0

Page 2 of 4

11-Nov-2011

II.3 Material

Quantity Part No. Description

2 ORAR00227-N7083 O-Ring 

2 MS 28775-010 O-Ring

2 LN 9348-08 Hexagon nut

2 LN 9348-06 Hexagon nut

100ml 1U-9891 or equivalent Additiv 1U-9891 Caterpillar Inc.

Materials including special tools are available from Diamond Aircraft Industries.

II.4 Consumables

Quantity Part No. Description

Approx. 2 l 3627020L Aero Shell Fluid 41

a. r. Royoco 81MS Grease Royoco 81MS

a. r. 135376 Loctite 262

Consumables may be procured locally or from Diamond Aircraft Industries

III INSTRUCTIONS

1

Make sure AMM-TR-MÄM-42-368 and AMM-TR-MÄM-42-447 are incorporated into the 

AMM.

2 Remove the LH Main Landing Gear Damper acc. to AMM section 32-10.

3

Release nitrogen and oil from the damper.

WARNING: Do not spill Fluid 41 on your skin or on your clothes. Fluid 41 is 

harmful and can cause skin disease and damage to clothes.

WARNING: Always wear safety glasses. The damper is gas loaded. 

 Install the adapter with drain hose onto the charging 

valve of the damper and release the pressure into 

the suitable container acc. to picture 1.

 Wait until the nitrogen is fully released.

 Push in the damper to minimum position to drain 

the oil.

Picture 1

4 Remove the charging valve from damper and install spacer.
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-095

WI-MSB 42NG-026

Revision 0

Page 3 of 4

11-Nov-2011

5

Remove the bottom cap:

 Remove the bolt holding the bottom cap.

 Pull the bottom cap from the damper assembly.

WARNING: Do not spill Fluid 41 on your skin or on your clothes. Fluid 41 is 

harmful and can cause skin disease and damage to clothes.

Note: Catch the residual oil into a suitable container.

 Clean the cap with acetone.

 Replace the O-Ring from the cap by new O-Ring ORAR00227-N7083 and apply 

a coat of Additive 1U-9891 on the new O-Ring.

Caution: Do not use steel tools when removing the O-Ring.

Do not scratch the surfaces of the groove.

6 Remove the nut on the piston end plate.

7

Install nut LN 9348-08 on the piston end plate. Secure the connection with Loctite 262

i.a.w. drawing D60-3277-10-00_01.

Picture 2

8 Allow Loctite to cure before filling (Minimum cure time 12 hours).

9 Install the bottom cap with the bolt, washer and nut.

10 Remove the spacer from piston tube.

11 Install the charging valve with a new O-Ring MS 28775-010.

12

Adjust the direction of the piston tube to the cylinder tube acc. to picture 3.

Note: The charging valve must be aligned with the nut from the bolt holding the 

bottom cap. 

Piston end plate

Nut

Spacer
Diamond Aircraft Industries GmbH

N. A. Otto-Straße 5

A-2700 Wiener Neustadt

WI-MSB 42-095

WI-MSB 42NG-026

Revision 0

Page 4 of 4

11-Nov-2011

Picture 3

13 Fill and charge the Damper acc. to AMM Section 32-10. 

14 Install the Damper to the MLG acc. to AMM Section 32-10.

15 Perform steps 2 through 14 on the RH MLG damper.

16 Clean working area and check for foreign objects.

17 Do a landing gear extension and retraction test and check clearance between MLG 

wheel and wheel bay i.a.w. AMM Section 32-10. 

18 Apply anti-corrosion coating on damper connections i.a.w. AMM Section 12-30.

19 Perform functional check of altered, repaired and new parts.

20 Test all systems in working area for function.

21 Make necessary entries into aircraft logs.