AD 87-15-05 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-B4TN-5 | HARTZELL PROPELLER, INC. Models HC-B4TN-5( )L/LT10574(B,K), LT1O574A(B,K), and LT1O574A(S)(B,K) Propellers |
Unsafe Condition
Propeller mid-blade failure which could result in engine separation from the aircraft.
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Required Actions
Visually check blades daily except when required to inspect every 4 flight days. Inspections must follow Hartzell SB No. 140C. Replace cracked blades and all blades in affected propeller assembly with Model LT1O574A(B,K) or LT1O574A(S)(B,K) blades before further flight. Conduct inspections within 100 hours time in service and repeat every 100 hours. Replace Model LT1O574(B,K) blades during next propeller overhaul.
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Compliance Time
After the effective date (December 2, 1987), with specific actions required following last flight of each day, every 4 flight days, within 100 hours time in service, and at next propeller overhaul.
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Affected Aircraft
Hartzell Propeller, Inc. Models HC-B4TN-5( )L/LT10574(B,K), LT1O574A(B,K), and LT1O574A(S)(B,K) propellers installed on Dornier Model 228-100 and -200 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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