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97-19-18

final rule

Airworthiness Directives; AlliedSignal Inc. TSCP700-4B and -5 Auxiliary Power Units

Unsafe Condition: First stage low pressure compressor (LPC) disk rim separation due to low cycle fatigue, which could result in an uncontained APU failure and damage to the aircraft.

Effective: Oct 27, 1997 Category: appliance Compliance: Required as indicated, unless accomplished previously.

Why matched: Airworthiness Directives; AlliedSignal Inc. TSCP700-4B and -5 Auxiliary Power Units

Technical illustration of an aircraft turbine engine assembly
Problem area Engine
View Details Official Source ↗

96-18-17

final rule

Airworthiness Directives; AlliedSignal Inc. TSCP700-4B, -4E, and -5 Auxiliary Power Units

Unsafe Condition: Material defect in certain high pressure turbine (HPT) disk forgings may result in HPT disk rupture prior to reaching the disk cyclic life limit.

Effective: Dec 9, 1996 Category: appliance Compliance: Prior to accumulating 7,500 cycles since new (CSN), or 3 years after the effective date of this A...

Why matched: Airworthiness Directives; AlliedSignal Inc. TSCP700-4B, -4E, and -5 Auxiliary Power Units

Technical illustration of an aircraft turbine engine assembly
Problem area Engine
View Details Official Source ↗