AD 2001-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom | Helicopter Corporation Model TH-28 and 480 | Airworthiness Directives; Enstrom Helicopter Corporation Model TH-28 and 480 Helicopters |
Unsafe Condition
Failure of a hub plate, loss of control of the main rotor, 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
Create a component history card or equivalent record for upper and lower hub plates (P/N 28-14280-1 and 28-14281-1). Determine and record total hours time-in-service (TIS). Replace hub plates with P/N 28-14280-3/28-14281-3 or P/N 28-14280-5/28-14281-5 depending on main rotor damper part numbers. Revise maintenance manual to establish 5000-hour TIS life limit.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days after the effective date (January 15, 2002).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Enstrom Helicopter Corporation Model TH-28 and 480 helicopters with upper hub plate P/N 28-14280-1 and lower hub plate P/N 28-14281-1 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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