18 results found (3656ms)
Airworthiness Directives; Engine Alliance Engines
Unsafe Condition: certain HPT interstage seals were manufactured from material suspected to contain iron inclusion, which may cause premature fracture and subsequent uncontained failure.
Why matched: Airworthiness Directives; Engine Alliance Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The presence of foreign material in the billet may lead to crack formations and premature failure of the HPC stage 8 rotor disk. This condition, if not addressed, could result in failure of the HPC...
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The engine fan hub assembly may have a fatigue crack originating inboard of a blade slot, which could result in an uncontained failure of the engine fan hub assembly.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The fracture of multiple LPC 1st-stage fan blades due to fatigue cracks originating on the internal surface of the convex airfoil and propagating to the point of failure.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The fracture of multiple fan blades due to cracks that originated on the internal surface of the convex airfoil and propagated to the point of failure.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: A fatigue crack originating inboard of a blade slot after the manufacturer performed a metallurgical examination of the engine fan hub that was recovered, related to the September 30, 2017 event.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The HPC interstage 5-6 seal teeth may fail due to an incorrectly installed stage 6 seal ring, leading to uncontained release of the HPC stages 2-5 spool.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: An uncontained failure of the engine fan hub assembly.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The engine fan hub assembly is subject to defects, damage, and cracks that could result in an uncontained failure.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: Failure of the HPT case could result in engine fire and damage to the airplane.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The incorrect installation of the stage 6 seal ring created a leakage path from the aft cavity to the forward cavity of the HPC stage 6 disk, which elevated the temperature in the cavity and advers...
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: The unapproved repairs reduced the material capability of these HPT cases, which requires their removal prior to reaching their published Airworthiness Limitation Section life limit. This condition...
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: An uncontained engine fan hub failure that could result in damage to the engine and airplane.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: Failure of a GP7200 fan hub, which could lead to an uncontained release of the fan hub, damage to the engine, and damage to the airplane.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: inadequate cooling of the HPT stage 1 shroud and stage 2 nozzle, leading to damage to the HPT stage 2 nozzle, burn-through of the turbine case, and in-flight shutdown
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: Reports of the installation of non-conforming honeycomb cartridges in the high-pressure compressor (HPC) adjacent to the HPC rotor stage 2 to 5 spool and stage 7 to 9 spool.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: Damage to the high-pressure compressor (HPC) stage 7-9 spool caused by failure of the baffle plate feature on affected HPC stage 6 disks.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines
Airworthiness Directives; Engine Alliance Turbofan Engines
Unsafe Condition: Inadequate cooling of the HPT stage 2 nozzle, leading to damage, burn-through of the turbine case, and engine shutdown.
Why matched: Airworthiness Directives; Engine Alliance Turbofan Engines