AD 98-26-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269D | Airworthiness Directives; Schweizer Aircraft Corporation Model 269D Helicopters |
Unsafe Condition
Cracking in the main rotor drive shaft caused by loss of clamping torque on the hub and shaft assembly due to grease between the hub and shaft, leading to potential shaft failure and loss of control.
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Required Actions
Remove and inspect the shaft for cracks using a 10-power magnifying glass and bright light. If no cracks are found, perform magnetic particle inspection per ASTM E1444. Replace cracked shafts with airworthy ones. Periodically verify hub bolt torque.
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Compliance Time
Prior to 200 hours time-in-service since hub/shaft assembly, and thereafter every 100 hours TIS.
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Affected Aircraft
Schweizer Model 269D helicopters with large diameter main rotor hub (P/N 269A1002-11) and main rotor drive shaft (P/N 269A5305-139, -143, -145, or -147).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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