AD 75-22-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | 280 | Airworthiness Directives; Enstrom Model F-28A and 280 Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28A | Airworthiness Directives; Enstrom Model F-28A and 280 Helicopters |
Unsafe Condition
The unsafe condition is related to the potential for the tail rotor drive shaft to separate during flight, which could result in loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct an inspection of the tail rotor drive shaft assembly for damage or wear, and replace the shaft if necessary. Revise the maintenance manual to include inspection procedures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before the accumulation of 50 flight hours since the effective date of this AD, or at the next scheduled maintenance, whichever occurs first.
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Affected Aircraft
Enstrom Model F-28A and 280 helicopters with certain serial numbers as specified in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Hub Lock Washer
Applicability Source Text
Show captured applicability text from the source AD
Skip to main content (Press Enter). United States Department of Transportation About DOTOur ActivitiesAreas of Focus FAA Dynamic Regulatory System A Comprehensive Knowledge Center of Regulatory and Guidance Material from the Office of Aviation Safety and other Services and Offices Welcome, Guest Sign In Search What's New DRS Feedback Home Technical issue with the system There is a technical issue with the system. Please try again later. U.S. Department of Transportation Federal Aviation Administration 800 Independence Avenue, SW Washington, DC 20591 (866) TELL-FAA | (866) 835-5322 Privacy Policy Accessibility
Document Text
Show stored source text (verify against official source)
Skip to main content (Press Enter). United States Department of Transportation About DOTOur ActivitiesAreas of Focus FAA Dynamic Regulatory System A Comprehensive Knowledge Center of Regulatory and Guidance Material from the Office of Aviation Safety and other Services and Offices Welcome, Guest Sign In Search What's New DRS Feedback Home Technical issue with the system There is a technical issue with the system. Please try again later. U.S. Department of Transportation Federal Aviation Administration 800 Independence Avenue, SW Washington, DC 20591 (866) TELL-FAA | (866) 835-5322 Privacy Policy Accessibility
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2018-02-01 Recurring
final ruleAirworthiness Directives; The Enstrom Helicopter Corporation Helicopters
Unsafe Condition: Cracks in the main rotor spindle, which could result in loss of a main rotor blade and subsequent loss of control of the helicopter.
2017-26-03
final ruleAirworthiness Directives; The Enstrom Helicopter Corporation Helicopters
Unsafe Condition: Failure of a rod end bearing assembly may result in the loss of a main rotor blade.
2012-11-05
final ruleAirworthiness Directives; Enstrom Helicopter Corporation Helicopters
Unsafe Condition: Failure of the cyclic trim system, which may lead to reduced controllability and subsequent loss of control of the helicopter.
2007-11-02
final ruleAirworthiness Directives; Enstrom Helicopter Corporation Model F-28A, F-28C, F-28F, TH-28, 280, 280C, 280F, 280FX, 480, and 480B Helicopters
Unsafe Condition: Corrosion in the main rotor push-pull control rods (push-pull rods) can lead to pitting, internal moisture, or failure, potentially causing severe in-flight vibration and loss of control.