AD 77-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | A109A | Airworthiness Directives; Agusta Model A-109A Helicopters |
Unsafe Condition
Premature failure of main rotor hub flap hinge bearings P/N SJ7355/IR7355 could cause improper operation of the main rotor flaps.
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Required Actions
Replace bearings per Part I of Agusta Technical Bulletin 109-3 within specified time limits. Inspect and replace bearings as needed per Part II of the same bulletin at intervals not exceeding 100 hours time in service or upon abnormal oil leaks.
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Compliance Time
Within the next 10 or 25 hours time in service after July 15, 1977, depending on serial number, and recurring intervals not exceeding 100 hours time in service or upon abnormal oil leaks.
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Affected Aircraft
Agusta Model A-109A helicopters with serial numbers up to and including S/N 7120 (except S/N 7119) and S/N 7119, S/N 7121 and up, equipped with main rotor hub flap hinge bearings P/N SJ7355/IR7355.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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