AD 2016-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Bell Helicopter Textron Helicopters |
Unsafe Condition
A bolt remaining in service beyond its fatigue life could result in failure of a bolt, failure of the main rotor hub, and subsequent loss of control of a helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Airworthiness Limitations section to establish a life limit of 5,000 hours TIS for each bolt P/N MS21250-08083. Determine the number of hours TIS for each bolt and update historical records. Remove from service each bolt that has reached or exceeded its life limit.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours time-in-service (TIS)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Model 430 helicopters, serial number 49001 through 49129, with main rotor head attachment bolt part number P/N MS21250-08083 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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