AD 64-28-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2 and 269B helicopters. |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2 and 269B helicopters. |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2 and 269B helicopters. |
Unsafe Condition
Inadequate lubrication of the main rotor blade flapping hinge bearings can cause binding, resulting in overstressing and failure of one main rotor blade.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect main rotor blade flapping hinge bearings for wear/damage per specified intervals; apply MIL-G-25537 grease at 25-hour intervals and ensure grease exudes from all bearings; remove bearings or blades from service if wear exceeds 0.002 inch limits or cracks are found; follow Hughes Service Information Notices for inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated in the AD, with inspections due based on time in service: helicopters with <100 hours must inspect before 110 hours and every 400 hours thereafter; those with ≥100 hours must inspect within 10 hours and every 400 hours thereafter; grease application must occur within 10 hours after AD effective date and every 25 hours thereafter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Schweizer Aircraft Corporation Models 269A, 269A-1, 269A-2, and 269B helicopters.
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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