AD 88-02-02
Unsafe Condition
Damage to the drive pinion gears on the spindle motor that operates the engine extension/retraction mechanism, which could result in the inability to obtain power in flight.
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Required Actions
Replace pages in the aircraft handbook Flight and Maintenance Manuals in accordance with Procedure 1. Check the engine extension time in accordance with Procedures 2 and 3. If extension time exceeds 13 seconds, replace the gas strut with Type 10-02-250-600/1200-N within 25 hours time in service or 90 days, whichever comes first. Modify the spindle drive in accordance with Procedure 4 of Glaser-Dirks Technical Note TN 826/18 within 25 hours time in service or 90 days, regardless of gas strut replacement. Allow ferrying under FAR Sections 21.197 and 21.199. Approve equivalent compliance methods or adjust compliance time with FAA approval.
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Compliance Time
Within the next 10 hours' time in service after the effective date of this AD for initial actions. Subsequent actions (gas strut replacement and spindle drive modification) must be done within 25 hours time in service or 90 days, whichever comes first.
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Affected Aircraft
GLASER-DIRKS FLUGZEUGBAU GmbH Model DG-400 motor gliders, work numbers 4-1 thru 4-188.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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