AD 2000-26-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | Deutschland GMBH Model MBB-BK 117 | Airworthiness Directives; Eurocopter Deutschland GMBH Model MBB-BK 117 Helicopters |
Unsafe Condition
Fatigue failure of a tension-torsion (TT) strap, leading to loss of a main rotor blade and subsequent loss of control of the helicopter.
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Required Actions
Remove TT straps P/N 2604067 (Bendix) or J17322-1 (Lord) from service or re-identify them as P/N 117-14110 or 117-14111. Create a component log card for each TT strap and determine its age and flight history. Remove any TT strap if its history cannot be determined. Replace TT straps P/N 117-14110 or 117-14111 that have been in service for 120 months or accumulated 25,000 flights with an airworthy strap. Revise the Airworthiness Limitations Section of the maintenance manual to establish a life limit for these TT straps.
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Compliance Time
Before further flight
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Affected Aircraft
Eurocopter Deutschland GMBH Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 helicopters, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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