AD 78-17-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 212 | Airworthiness Directives; Bell Model 212 Helicopter |
Unsafe Condition
Failure of the input spiral bevel gear, P/N 204-040-701-3, used in the main transmission of Bell Helicopter Textron Model 212 helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours time in service after the effective date, inspect all 62 teeth of the main spiral bevel gear per Service Bulletin 212-78-8, replace any non-compliant gear, install a decal stating 'ROTOR BRAKE INOPERATIVE', and perform subsequent inspections every 25 hours. Compliance includes removing rotor brake quill assembly or cover plate, inspecting gear teeth, replacing gears as needed, and following service bulletin procedures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours time in service after the effective date of this Airworthiness Directive (AD), and thereafter at intervals not to exceed 25 hours time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Model 212 helicopters equipped with main transmission spiral bevel gear, P/N 204-040-701-3.
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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