AD 2008-23-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Diamond | Aircraft Industries GmbH Model DA 42 | Airworthiness Directives; Diamond Aircraft Industries GmbH Model DA 42 Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Diamond Aircraft Industries GmbH Model DA 42 Airplanes |
Unsafe Condition
The powder coating of the rear right hand (RH) engine support bracket degrades over time, leading to reduced torque of the engine mounting bolts. In some cases, bolts have fully unscrewed and fallen into the engine cowling, potentially causing engine shutdown and reduced control of the aircraft.
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Required Actions
Inspect and correct the fastening torque of the RH rear engine support bracket mounting bolts following Diamond Aircraft Industries GmbH Mandatory Service Bulletin No. MSB-42-058 and Diamond Aircraft Industries GmbH Work Instruction WI-MSB-42-058. Replace all RH rear engine support bracket mounting bolts with wire-secured bolts, P/N D60-9071-26-01, following the same service bulletin and work instruction.
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Compliance Time
Within 100 hours time-in-service (TIS) after December 22, 2008, and repetitively thereafter at intervals not to exceed 100 hours TIS for torque inspections. Within 6 months after December 22, 2008, for bolt replacement.
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Affected Aircraft
Diamond Aircraft Industries GmbH Model DA 42 airplanes, all serial numbers, certificated in any category, with Thielert TAE125-01 engines installed, except those airplanes with engines identified by serial number in Diamond Aircraft Industries GmbH Mandatory Service Bulletin No. MSB-42-058, dated May 21, 2008, that have been installed with wedge locking washers and bonded-in bolts.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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