AD 88-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | F-28 | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F28 Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28A | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F28 Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F28 Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C-2 | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F28 Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C-2R | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F28 Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28F | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F28 Series Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28F-R | Airworthiness Directives; THE ENSTROM HELICOPTER CORPORATION Model F28 Series Helicopters |
Unsafe Condition
Cracks in the horizontal stabilizer attachments could result in failure and loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct daily pre-flight checks applying a 3 lb load to stabilizer tips, inspect for deflection or looseness. Every 100 hours' time in service, remove and inspect stabilizer assemblies for burrs, fretting, cracks, corrosion; replace cracked or corroded parts. Measure spar wall thickness, repair or replace if less than 0.044 inch. Use magnetic particle or dye penetrant inspection methods with 10x magnification. Reinstall spar correctly and update weight and balance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours' time in service after May 31, 1988, and thereafter every 100 hours' time in service.
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Affected Aircraft
Enstrom Helicopter Corporation Model F28 series helicopters with horizontal stabilizer center spar P/N 28-11222.
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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