AD 2000-08-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta | Model A109A, A109AII, and A109C | Airworthiness Directives; Agusta Model A109A, A109AII, and A109C Helicopters |
Unsafe Condition
Failure of the main transmission due to a cracked Gleason crown, leading to loss of rotor drive 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 transmission to determine if a Gleason crown, part number 109-0403-07, is installed. If the Gleason crown is listed in Table 1, replace it with an airworthy Gleason crown, part number 109-0403-07-103, serial number B58264 or subsequent, except B58271. Mark the nomenclature 'S.M. 109254' on the additional nameplate, part number MS27253-2, and update the main transmission assembly historical record with the part number and serial number of the installed Gleason crown. If not previously bonded, bond the additional nameplate with adhesive EA934NA below the main transmission nameplate.
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Compliance Time
Before further flight
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Affected Aircraft
Agusta Model A109A, A109AII, and A109C helicopters, serial numbers 7630, 7633, 7654, 7667, 7671, 7672, 7676, or 7677, with main transmission part numbers 109-0400-02-5 or 109-0400-03-105, and Gleason crown part number 109-0403-07 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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