AD 79-23-03 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; Hughes Model 269A, 269A-1, 269B, 269C, and TH-55A |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; Hughes Model 269A, 269A-1, 269B, 269C, and TH-55A |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; Hughes Model 269A, 269A-1, 269B, 269C, and TH-55A |
| aircraft | Schweizer Aircraft Corporation | 269C | Airworthiness Directives; Hughes Model 269A, 269A-1, 269B, 269C, and TH-55A |
Unsafe Condition
Corrosion, cracks, pitting, and other defects in tail rotor blades could result in blade failure, leading to loss of tail rotor control.
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Required Actions
Inspect tail rotor blades using visual or X-ray methods per specified Hughes Service Information Notices (SIN N-130 for Group I, SIN N-162 for Group II). Replace or rework blades as required. Perform hardness tests on specific blades (P/N 269A6035-17/-19) per SIN Part XI. Repeat inspections every 12 months. Mark or destroy non-compliant blades.
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Compliance Time
Within the next 100 hours time in service or 6 calendar months from November 19, 1979, whichever comes first for blades with ≥500 hours. For blades with <500 hours, inspect before reaching 600 hours or within 6 calendar months. Subsequent inspections every 12 months.
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Affected Aircraft
Schweizer Aircraft Corporation Models 269A, 269A-1, 269B, 269C, and TH-55A with tail rotor blades in Group I or II as listed (e.g., P/N 269A6124, 269A6035 series with specific serial numbers).
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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