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Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria DAI MSB 42-154 DAI MSB 42NG-101 Page 1 of 4 29-Jun-2026
MANDATORY SERVICE BULLETIN MSB 42-154 MSB 42NG-101
I TECHNICAL DETAILS I.1 Category Mandatory.
I.1 Airplanes affected Type: DA 42, DA 42 M, DA 42 NG, DA 42 M-NG Serial numbers: All I.2 Date of effectivity 29-Jun-2026 I.3 Time of Compliance
Prior to the initial inspection for airplanes with more than 1000 flight hours on 29-Jun-2026:
Flights must not include traffic pattern work (i.e. touch and goes) nor intended go - arounds with landing gear operation as part of the normal procedure.
Note: Go-arounds for safety reasons are however authorized.
Initial inspection:
For aircraft with over 4000 flight hours:
Within the next 5 flight cycles.
For all aircraft with over 1000 up to 4000 flight hours:
Within the next 50 flight cycles.
For airplanes with a Statement Of Conformity dated before and on 29-Jun-2026 with up to 1000 flight hours on 29-Jun-2026:
Within 2000 flight cycles after 29-Jun-2026.
For new airplanes manufactured after 29-Jun-2026:
Within 4000 flight cycles.
Repetitive inspection:
Latest every 4000 flight cycles (+/- 5%) after the initial or last repetitive inspection or since new.
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria DAI MSB 42-154 DAI MSB 42NG-101 Page 2 of 4 29-Jun-2026
Note: Combining the repetitive inspection with a scheduled maintenance inspection can increase aircraft availability. It is recommended to c onsider the expected flight cycles within the next scheduled maintenance interval.
I.4 Subject Inspection of nose landing gear actuator rod end.
ATA-Code: 32-30
I.5 Reason Diamond Aircraft has received a preliminary and interim accident investigation report about a failure of the rod end of the NLG hydraulic actuator. Th is failure has resulted in uncommanded deflection of the rudder to the left. In combination with a feathered LH engine this led to loss of control.
An additional case has been identified with a failed rod end of the NLG hydraulic actuator where the situation was resolved by re-extending the landing gear.
The investigation of the fracture of the rod end and identification of the final root cause is ongoing and may lead to further evaluation of this MSB. The ATSB accident investigation is also still ongoing.
In order to immediately identify rod ends with cracks, this Service Bulletin prescribes initial and recurring inspections of the rod end for cracks.
Until the initial inspection is passed certain restrictions on flights may apply.
This Service Bulletin will be mandated by an EASA Airworthiness Directive (AD).
I.6 Concurrent Documents None.
I.7 Approval The technical content of this document has been approved under the authority of the DOA ref. EASA.21J.052.
I.8 Accomplishments / Instructions See WI-MSB 42-154/WI-MSB 42NG-101, latest effective issue.
Note: Reporting of findings of cracks, deformation, corrosion or damage and available data as well as returning defect ive parts to Diamond Aircraft is considered mandatory.
II Mass (Weight) and CG No change.
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria DAI MSB 42-154 DAI MSB 42NG-101 Page 3 of 4 29-Jun-2026
II PLANNING INFORMATION II.1 Material and Availability See WI-MSB 42-154/WI-MSB 42NG-101, latest effective issue.
II.2 Special Tools See WI-MSB 42-154/WI-MSB 42NG-101, latest effective issue.
II.3 Labour Effort Approx. 4 hours.
II.4 Credit For airplanes under warranty.
II.5 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.
III REMARKS
1. All work must be done by a certified aircraft service station or a certified aircraft maintenance mechanic.
2. All work, particularly that which is 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 logbook.
4. In case of doubt contact Diamond Aircraft Industries GmbH.
5. Execution report must be sent to Diamond Aircraft Industries GmbH.
6. If any cracks or damages are found on the rod end, c ontact and send the part to Diamond Aircraft Industries GmbH.
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria DAI MSB 42-154 DAI MSB 42NG-101 Page 4 of 4 29-Jun-2026
EXECUTION REPORT TO
SERVICE BULLETIN MSB 42-154 MSB 42NG-101
AIRPLANE INFORMATION Airplane Serial Number __________________ Airplane Registration __________________ Airplane Operator __________________ Hours of operation of airplane __________________ Number of landings __________________ Hours of operation – engine LH __________________ RH __________________ Typical operation of airplane private, training, special mission, other __________________ Findings O no crack detected O crack detected: TSN rod end _________ flight cycles rod end _________ __________________________________ Date, Name, Sign Submit the execution report to Diamond Aircraft Industries GmbH.:
• Use preferably the electronic execution report via the Diamond Partner Portal.
o Login to the Diamond Partner Portal https://partners.diamondaircraft.com/.
o Search for the Aircraft (A/C):
▪ Use the search field at the top, or ▪ Navigate through the menu: Support > My Fleet, then open the A/C by clicking the link.
o In the right section "Aircraft Action," click the button "Add Execution Report".
o Choose "MSB 42-154/MSB 42NG-101".
o Either create a new execution report or select a draft you previously created.
o Save and then submit the execution report
• Alternatively send the execution report to executionreports@diamondaircraft.com.
Keep a copy of the execution report in the aircraft log.
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria
WI-MSB 42-154 WI-MSB 42NG-101 Revision 0 Page 1 of 6 29-Jun-2026
WORK INSTRUCTION WI-MSB 42-154 WI-MSB 42NG-101
I GENERAL INFORMATION I.1 Subject Inspection of nose landing gear actuator rod end.
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 airc raft maintenance mechanic.
b) All work, in particular if not described in this work instruction, must be done in accordance with the referenced maintenance manual.
c) For conversion factors between SI units and US/Imperial units refer to AMM, Chapter 02.
d) In case of doubt, contact Diamond Aircraft Industries GmbH.
II DRAWINGS, SPECIAL TOOLS & MATERIALS II.1 Drawings None.
II.2 Special Tools Thin open wrench 17mm.
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria
WI-MSB 42-154 WI-MSB 42NG-101 Revision 0 Page 2 of 6 29-Jun-2026
II.3 Material Quantity Part Number Description 2 DIN 471-10x1.0-MZP Circlip As required X11-0006-SMRCD10IRMR.7403 or X11-0006-GARSW-10RR Rod End As required D60-3223-00-33 BFW Actuator Bolzen Material is available from Diamond Aircraft Industries.
III INSTRUCTIONS WARNING:
TAKE PRECAUTIONS BY SECURING THE AREA AROUND THE AIRPLANE BEFORE YOU PERFORM MAINTENANCE ON THE LANDING GEAR. THE
LANDING GEAR RETRACTION SYSTEM CAN CAUSE SERIOUS INJURY TO PERSONS IF OPERATED ACCIDENTALLY.
1 Raise the airplane on jacks and move the wing and rear fuselage trestles into position to support the airplane. Refer to AMM section 07-10.
2 Retract the landing gear.
WARNING:
THE LANDING GEAR EXTENDS AUTOMATICALLY IF THE EMERGENCY EXTENSION IS OPERATED OR ELECTRIC POWER TO THE HYDRAULIC SYSTEM IS DISCONNECTED.
KEEP CLEAR OF THE TRAJECTORY OF THE LANDING GEAR AT ALL TIMES. REMOVE ALL OBJECTS WITHIN THE TRAJECTORY OF THE LANDING GEAR.
3 Depressurize the hydraulic system by operating the emergency extension of the landing gear.
WARNING:
SAFEGUARD THE LANDING GEAR SWITCH AND THE EMERGENCY GEAR EXTENSION LEVER AGAINST INADVERTENT OPERATION.
4 Disconnect the nose landing gear doors. Refer to AMM section 32-20.
- Remove the pins attaching the door connecting arms to the nose landing gear door.
- Move the connecting arms clear of the nose landing gear door.
CAUTION:
THE GEAR LEG SWINGS BACK WHEN THE FOLDING STAY IS DISCONNECTED AND CAN DAMAGE THE DIFFERENTIAL SWITCH.
HOLD THE NOSE LANDING GEAR LEG FIRMLY.
5 Put foam plastic in between the nose landing gear leg and the airplane fuselage to protect the differential switch from damage.
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria
WI-MSB 42-154 WI-MSB 42NG-101 Revision 0 Page 3 of 6 29-Jun-2026
WARNING:
DO NOT REMOVE THE PIN WHICH CONNECTS THE NOSE LANDING
GEAR FOLDING STAY DRAG LEVER AND THE DRAG STRUT WHEN STILL MOUNTED IN THE AIRPLANE.
WARNING:
THE NOSE LANDING GEAR FOLDING STAY IS SPRING LOADED.
IF THE FOLDING STAY IS DISCONNECTED FROM THE NLG LEG, THE FOLDING STAY SWINGS FORWARD AND CAN CAUSE SERIOUS INJURY TO PERSONS.
WARNING:
FOR THE FOLLOWING STEP SIT IN FRONT OF THE NOSE LANDING GEAR LEG FACING THE AFT. MAKE SURE TO POSITION
YOURSELF SO THAT THE NOSE LANDING GEAR FOLDING STAY CANNOT HIT YOU WHEN IT IS RELEASED.
6 Unload the tension on the nose landing gear folding stay:
- Remove the nut and washer from the nose landing gear leg which connects the folding stay to the NLG leg.
- Carefully remove the bolt with spacer while holding the folding stay firmly.
- Unload the nose landing gear folding stay slowly until the spring tension is fully released.
7 Disconnect the actuator from the nose landing gear:
- Remove the left hand (seen in flight direction) circlip which secures the pin that connects the rod end of the actuator with the NLG leg.
- Remove the pin with the second circlip.
- Remove the circlip from the pin.
- Discard both circlips.
8 Measure and record distance Y from the actuator safety washer to the center of the ball joint as indicated in the figure below.
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria
WI-MSB 42-154 WI-MSB 42NG-101 Revision 0 Page 4 of 6 29-Jun-2026
9 Remove the rod end from the NLG actuator:
- Mark the orientation of the rod end with indelible ink on the bottom side of the rod end.
- Remove the lock wire from the jam nut.
- Retain the piston of the NLG actuator against rotation with special tool II.2 and loosen the jam nut.
- Remove the rod end, jam nut and the safety washer from the actuator.
10 Visually inspect the entire rod end for cracks, deformation, corrosion and damage:
- Clean the thread to remove any dirt and grease.
NOTE: do not remove the marking done in step 9.
- Do a visual inspection of the entire thread length from all sides for cracks, deformation, corrosion and damage. Use proper lighting and a magnifying glass of minimum 20X magnifying power.
NOTE: Cracks may appear as small lines or splits at the bottom of the threads.
Check the spherical bearing for free movement.
If any cracks, deformation, corrosion or damage is found or the bearing is not moving freely, tag the part as “not airworthy” and replace it with a new part per II.3.
If no damage or cracks are found, re-install the original rod end (proceed with step 12).
11 If the rod end is rejected, send the part back to Diamond Aircraft:
Diamond Aircraft Industries GmbH Attn: Office of Airworthiness N.A. Otto-Straße 5 2700 Wiener Neustadt Austria – Europe
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria
WI-MSB 42-154 WI-MSB 42NG-101 Revision 0 Page 5 of 6 29-Jun-2026
CAUTION:
DO NOT INSTALL A ROD END WITH VISIBLE DEFECTS, CORROSION, DAMAGES OR CRACKS.
12 Install the rod end to the NLG actuator:
- Apply Rivolta F.L.A (or equivalent anti-seize suitable for corrosion resistant steel) on the thread of the rod end.
- Install the jam nut and the safety washer to the rod end.
- Install the rod end together with the safety washer and the jam nut to the piston of the NLG actuator.
- Adjust the rod end to obtain distance ‘Y’ measured in step 11.
- Tighten the jam nut to 25Nm retain the piston of the actuator with special tool acc. II.2.
13 Secure the jam nut with lock wire.
- Route the lock wire through both holes on one side of the safety washer, as shown in the picture below.
- 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 of the NLG leg.
- Rotate the piston of the actuator so that maximum clearance of the safety wire to the attachment lever of the NLG leg and surrounding structure is obtained.
NOTE: The safety wire must not face downwards or to the left (seen in flight direction).
14 Visually inspect the entire pin for deformation, corrosion and damage: Clean the pin prior inspection to remove any dirt and grease.
CAUTION:
DO NOT OVERSTRETCH THE CIRCLIPS DURING INSTALLATION AND ASSURE CORRECT FIT IN THE GROOVES OF THE PIN.
15 Reinstall the Nose Landing Gear Actuator.
- Install a new circlip per II.3 to th e pin connecting the NLG actuator rod end to the NLG leg.
- Position the NLG actuator at the attachment lever of the NLG leg.
- Install the pin connecting the NLG actuator rod end to the NLG leg from right hand side (seen in flight direction).
- Install a new circlip per II.3 to the left hand side (seen in flight direction) of the pin connecting the NLG actuator rod end to the NLG leg.
safety washer
Diamond Aircraft Industries GmbH Nikolaus-August-Otto-Straße 5 2700 Wiener Neustadt, Austria
WI-MSB 42-154 WI-MSB 42NG-101 Revision 0 Page 6 of 6 29-Jun-2026
16 Install the folding stay to the NLG leg. Refer to AMM section 32-20.
17 Make all necessary measurements and adjustments according to AMM section 32-20 18 Do a landing gear extension and retraction test. Refer to AMM section 32-30.
19 Check clearance of the NLG actuator to adjacent structure and the NLG over its whole travel.
If the check results in no positive clearance, contact Diamond Aircraft Industries GmbH.
20 Check for positive clearance between NLG actuator safety washer and actuator attachment lever at the NLG leg when the landing gear is retracted.
- If there is no positive clearance between NLG actuator safety washer and actuator attachment lever at the NLG leg, adjust the NLG actuator length (determine new value ‘Y’) according to AMM section 32-20, and redo steps 2-7, 9, 12, 13 and 15-20 of this document.
- If no positive clearance can be adjusted, contact Diamond Aircraft Industries GmbH.
21 Clean working areas, check for foreign objects.
22 Check all altered, replaced, repaired parts for proper function.
23 Test all systems in working area for function.
24 Do all necessary entries in the airplane logs.
positive clearance