AD 78-25-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; Hughes Model 269A, TH-55A, 269A-1, 269B and 269C Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; Hughes Model 269A, TH-55A, 269A-1, 269B and 269C Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; Hughes Model 269A, TH-55A, 269A-1, 269B and 269C Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269C | Airworthiness Directives; Hughes Model 269A, TH-55A, 269A-1, 269B and 269C Helicopters |
Unsafe Condition
Fatigue crack propagation in the main transmission input pinion assembly could cause failure.
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Required Actions
Perform a magnetic particle inspection of input pinions (Part No. 269A5103-9) for cracks per Hughes Service Information Notice N-151.2. Reinspect pinions with less than 250 hours total time in service between 450 and 500 total hours time in service. Remove and mark assemblies showing cracks.
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Compliance Time
Within the next 50 hours additional time in service or 60 calendar days, whichever occurs first after the effective date of this AD for affected serial numbers in Table A. For other pinions, within 100 hours additional time in service after the effective date.
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Affected Aircraft
Schweizer Aircraft Corporation Model 269A, TH-55A, 269A-1, 269B, and 269C helicopters equipped with part number 269A5103-9 pinion assemblies, Hughes Tool Company, Serial Nos. 001 through 5101.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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