AD 88-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | MBB-BK 117 A-1 | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM (MBB) Model BK-117A-1, BK-117A-3, and BK-117A-4 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | MBB-BK 117 A-3 | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM (MBB) Model BK-117A-1, BK-117A-3, and BK-117A-4 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | MBB-BK 117 A-4 | Airworthiness Directives; MESSERSCHMITT-BOLKOW-BLOHM (MBB) Model BK-117A-1, BK-117A-3, and BK-117A-4 Helicopters |
Unsafe Condition
The flightcrew lacks emergency engine shut down instructions to be followed in the event of an impending engine turbine burst.
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Required Actions
Insert updates (or forthcoming permanent equivalent revisions) into the applicable FAA-approved flight manual for Model BK-117A-1 and BK-117A-3 helicopters, and insert Temporary Revision 1 into the Rotorcraft Flight Manual for Model BK-117A-4 helicopters. Alternate means of compliance may be used if approved by the FAA.
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Compliance Time
within the next 50 hours' time in service after the effective date of this AD
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Affected Aircraft
MESSERSCHMITT-BOLKOW-BLOHM (MBB) Model BK-117A-1, BK-117A-3, and BK-117A-4 helicopters, all serial numbers, equipped with Lycoming Model LTS-101 series engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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