AD 95-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; Schweizer Aircraft Corporation and Hughes Helicopters, Inc. Model 269A, 269A-1, 269B, 269C, and TH-55A Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; Schweizer Aircraft Corporation and Hughes Helicopters, Inc. Model 269A, 269A-1, 269B, 269C, and TH-55A Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; Schweizer Aircraft Corporation and Hughes Helicopters, Inc. Model 269A, 269A-1, 269B, 269C, and TH-55A Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269C | Airworthiness Directives; Schweizer Aircraft Corporation and Hughes Helicopters, Inc. Model 269A, 269A-1, 269B, 269C, and TH-55A Helicopters |
Unsafe Condition
Structural failure of the main rotor (M/R) drive shaft, separation of the M/R from the helicopter, and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the main rotor drive shaft for cracks, distortion, corrosion, or other surface damage using radiographic or other non-destructive inspection procedures from Schweizer Service Bulletin B-255.1. Inspections must be conducted at specified time intervals or upon certain conditions, including within 25 hours time-in-service for newer serial numbers, or before further flight if uncorrectable vibrations occur. Replace unairworthy shafts before further flight.
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Compliance Time
Required as indicated, unless accomplished previously.
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Affected Aircraft
Schweizer Aircraft Corporation and Hughes Helicopters, Inc. Model 269A, 269A-1, 269B, 269C, and TH-55A helicopters with main rotor drive shaft part numbers 269A5305-3 or 269A5305-11 installed, excluding those with serial numbers prefixed 'SZ' or 'ZS'.
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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