AD Amdt-39-10194
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer | Various | Airworthiness Directives; Schweizer Aircraft Corporation Model 269A, A-1, B, and C, and TH-55A Helicopters |
Unsafe Condition
Failure of the main rotor transmission ring gear due to single tooth distress caused by improper gear tooth spacing during manufacturing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the ring gear teeth for surface deterioration including pitting, excessive wearing, cracking, or corrosion. Replace the ring gear if deterioration is found. Create a main rotor transmission component log card if none exists and document any ring gear changes on the log card.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Schweizer Aircraft Corporation Model 269A, A-1, B, and C, and TH-55A helicopters with a certain main rotor transmission ring gear installed.
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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