SusiAir PILATUS PORTER PC6, Maintenance Program

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Form ASI-PC6 Sudden Propeller Stoppage Inspection
Reissued: 2
Revision: 1
Date: July 2020 Page 3 of 4
NO. DESCRIPTION TASK NO. MECH. ENG. RII
b. Inspect remainder of the engine
1. Remove and examine the main oil filter (Ref. 79-20-02, OIL
FILTER, HOUSING AND CHECK VALVE - MAINTENANCE
PRACTICES). If metallic debris is found, refer to FAULT
ISOLATION.
79-20-02 N/A
2. Examine for cracks or distortion at all the engine casings and
housings, especially at or near the flanges. Remove the starter-
generator, then do a check for all AGB pads and AGB-mounted
engine and airframe components (Ref. 72-60-00, ACCESSORY
GEARBOX ASSEMBLY - MAINTENANCE PRACTICES).
Examine for shearing, cracks, distortion or mis-alignment, and
loose/pulled fasteners. Similarly, examine all engine mounts (Ref.
72-30-04, GAS GENERATOR CASE - MAINTENANCE
PRACTICES).
72-60-00,
72-30-04
N/A
3. Examine the fireseals for warping or buckling (Ref. 72-30-01,
CENTER FIRESEAL MOUNT RING - MAINTENANCE
PRACTICE and 72-30-02, REAR FIRESEAL MOUNT RING -
MAINTENANCE PRACTICES) and all external tubes for damage
and/or fluid leaks (Ref. 70-00-00, STANDARD PRACTICES -
INSPECTION) or replace as necessary.
72-30-01,
72-30-02,
70-00-00
N/A
4. Do a check for all the airframe/engine connections, including fuel
inlet and oil cooler lines, air system, electrical, ignition and
indicating systems, control linkages, and drains (Ref. AMM).
AMM N/A
5. For propeller strike on a power line (power utility line does not
include guide/support wires, telephone or telecommunications
lines), examine for evidence of electrical discharge (local burn
marks) at the Flange C or at the compressor turbine.
N/A
6. Turn the compressor by hand and listen for rubbing, scraping,
interference of rotating components with stationary parts, or
fast/sudden deceleration. Examine for rear accessory case
mounted accessory drag. Examine for the compressor turbine tip
rub (Ref. 72-50-02, COMPRESSOR TURBINE - MAINTENANCE
PRACTICES).
72-50-02 N/A
7. As given above, for casing or accessories damage, sign of
electrical discharge, unusual noises that could show damage to
the gears, bearings, seals or rotors, slow compressor acceleration
on start or sudden deceleration on shutdown, remove the
complete engine from service and send it to an approved P&WC
overhaul facility for light overhaul with an applicable document
that show the reason for sudden propeller stoppage and extent of
engine damage.
N/A
8. After installation of a repaired/replaced power section on the
serviceable gas generator, run at 80% take-off power for 10
minutes. Remove and examine the main oil filter (Ref. 79-20-02,
OIL FILTER, HOUSING AND CHECK VALVE - MAINTENANCE
PRACTICES). If no metallic debris is found, return the engine to
service.
79-20-02 N/A
9. Examine the main oil filter after one week (25 hours minimum, 65
hours maximum). If no metallic debris is found, return to standard
inspection schedule.
N/A
4
Propeller strike causes minor blade damage (not structural), or propeller strike with engine at or below FLIGHT-
IDLE power (Ng at or below 82 %) or while engine shutdown.
NOTE : Blade damage is considered minor or not structural, when:
−
The propeller blade spar is not bent
− The damage shell does not slow the spar
−
The blade tip bent is small
− The blade indentation
−
The blade delamination (composite blade)
− The blade tip missing material equal or below 1 in. (composite blade) and
− No vibrations reported by the operator (Ref. AMM)