AD 77-10-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 205A-1 | Airworthiness Directives; Bell Model 205A-1 Helicopters |
Unsafe Condition
Failure of the engine-to-transmission drive couplings due to excessive angularity under high loading conditions.
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Required Actions
Adjust the engine-to-transmission alignment by removing the driveshaft assembly, reindexing target plate scales to 8.0 and 35.6, setting angularity with dial indicators, shimming engine support fittings, and modifying firewall if interference occurs. Reinstall components per manuals.
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Compliance Time
Within the next 100 hours cumulative time in service involving external load combinations or 300 hours total time in service, whichever comes first, after May 18, 1977 for Part 133 helicopters. Standard category helicopters not approved for external loads must comply within 300 hours time in service after May 18, 1977.
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 205A-1 helicopters, serial numbers 30001 through 30232.
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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