AD 80-18-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; HUGHES HELICOPTERS Model 269A, and TH-55A, 269A-1, 269B and 269C Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; HUGHES HELICOPTERS Model 269A, and TH-55A, 269A-1, 269B and 269C Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; HUGHES HELICOPTERS Model 269A, and TH-55A, 269A-1, 269B and 269C Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269C | Airworthiness Directives; HUGHES HELICOPTERS Model 269A, and TH-55A, 269A-1, 269B and 269C Helicopters |
Unsafe Condition
Fracture of main transmission pinion shaft due to scratches, tooling marks, corrosion, or other surface defects in areas such as the fillet radii and threaded area forward of the bearing journal.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and disassemble main transmission assembly. Inspect pinion for defects using 10X glass; polish defects with approved methods. Perform magnetic particle inspection; mark unserviceable pinions if cracks or unremovable indications. Treat polished areas with zinc chromate and paint white dot on gear box ID plate.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 50 hours' time in service from the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Schweizer Aircraft Corporation Models 269A, TH-55A, 269A-1, 269B, 269C with main transmission P/N 269A5175-7 or 269A5175-9, serial numbers listed in the AD (e.g., 5743 through 5804, 5903 through 5908, etc.).
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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