AD 2021-10-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH |
| aircraft | Bell | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH |
Unsafe Condition
Reports of a lower clamp found missing from the bellows and damaging the swashplate bearing ring before becoming detached. An investigation showed that over-torqueing can damage the clamp, which may have caused the clamp to become loose and detach.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Removing the affected bellows from the swashplate, cleaning and inspecting the support tube for scratches, and depending on the inspection results reworking the cylindrical area. Inspecting the clamp for corrosion, damage, and incorrect installation, and depending on the inspection results, removing the clamp from service or reinstalling the clamp correctly and applying a torque. Inspecting each ball bearing for corrosion, and depending on the inspection results, removing each ball bearing from service. Inspecting the deflection ring for foreign objects by removing the lockwire, screws, and the outer deflection ring and removing any foreign objects. Inspecting the swashplate for foreign objects and excessive bearing rolling friction within 400 hours TIS. Replacing a corroded or damaged clamp, and repairing a scratched support tube.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service, and within 400 hours TIS
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Affected Aircraft
Airbus Helicopters Model BO-105A, BO-105C, BO-105S, BO105LS A-3, MBB-BK 117A-1, MBB-BK 117A-3, MBB-BK 117A-4, MBB-BK 117B-1, MBB-BK 117B-2, MBB-BK 117C-1, MBB-BK 117C-2, and MBB-BK 117D-2 helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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