AD 97-20-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | MD900 | Airworthiness Directives; McDonnell Douglas Helicopter Systems Model MD-900 Helicopters |
Unsafe Condition
The outer bearing race rotating relative to the swashplate assembly, evidenced by wear marks, could cause heat accumulation and damage to the bearing, leading to degraded helicopter response to pilot control input and possible loss of control.
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Required Actions
Inspect the main rotor swashplate bearing (P/N 900C3010100-101) to determine if it has one of the specified serial numbers (S/N 059150-E0019 to E0030). If installed, remove and replace the bearing with an airworthy one before further flight.
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Compliance Time
before further flight
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Affected Aircraft
McDonnell Douglas Helicopter Systems Model MD-900 helicopters, certificated in any category
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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