AD 81-17-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; HUGHES HELICOPTERS Model 269 Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; HUGHES HELICOPTERS Model 269 Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; HUGHES HELICOPTERS Model 269 Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269C | Airworthiness Directives; HUGHES HELICOPTERS Model 269 Helicopters |
Unsafe Condition
Failure of the main transmission due to cracks, fretting, or other stress risers in the main rotor ring gear drive shaft assemblies with P/Ns 269A5179, 269A5179-3, or unmodified P/N 269A5179.
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Required Actions
Inspect shaft and coupling assembly lower bearing bore and fasteners for cracks, fretting, or stress risers per Hughes Service Notice N-179. Replace with P/N 269A5194 assembly reworked per N-142.1 if issues found. Perform recurring inspections at specified intervals or replace assemblies with P/N 269A5194 within specified compliance times.
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Compliance Time
Within 100 hours' additional time in service from the effective date or 600 hours total time in service, whichever occurs later (for paragraph (a)(1)), or within 100 hours' additional time in service from the effective date or 2,000/2,500 hours total time in service depending on model (for paragraph (a)(2)), or within 25 hours' additional time in service after the effective date, 400 hours' total time, or 300 hours since last inspection (for paragraph (b)), with subsequent intervals not exceeding 300 or 500 hours as specified.
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Affected Aircraft
Schweizer Aircraft Corporation Model 269A, 269A-1, 269B, 269C helicopters and TH-55s with P/Ns 269A5179, 269A5179-3 Drive Shaft Coupling Assemblies or unmodified P/N 269A5179 Ring Gear Carrier Assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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