REQUIREMENTSREQUIREMENTS

REQUIREMENTS

The PT6A engine maintenance program shall be carried out in accordance with approved maintenance data and detailed in a system of maintenance approved under Civil Aviation Regulation (CAR 1988) 42M. The system of maintenance shall include, but need not be limited to, the following requirements.

PT6A engines not previously maintained in accordance with a maintenance program reflecting the intent of the maintenance requirements detailed in this Appendix and with engine hours in service greater than 75% of the Pratt and Whitney Canada published Time Between Overhaul (TBO) period at the time of introduction, shall be subject to a pro-rata TBO period based on the Pratt and Whitney Canada published TBO period; and

2. The engine shall be on an Engine Condition Trend Monitoring (ECTM) program, including data collection, analysis and follow up actions. This program shall be in accordance with the Pratt and Whitney Canada ECTM Users Guide and Reference Manual (PWC P/N 3031900) or WebECTM per PWC SIL PT6A-122 and include requirements for qualification and training for personnel conducting ECTM; and

3. Hot section inspections shall be carried out at intervals not to exceed:

(a) 1250 hours time in service; or

(b) 1760 hours time in service subject to a boroscope inspection of the engine hot section for evidence of cracks, distortion, burning and coating loss at intervals not to exceed 610 hours time in service; and

4. All fuel nozzles shall be cleaned and flow checked at intervals not to exceed 460 hours time in service; and

5. The engine oil filter element shall be inspected for contamination at intervals not to exceed 220 hours time in service; and

6. The reduction gearbox chip detector shall be inspected for contamination, or continuity, at intervals not to exceed 220 hours time in service; and

7. Engines with an annual utilisation of less than 500 hours per annum, an engine oil change shall be carried out at intervals not to exceed 12 calendar months time in service; and

8. An inspection of the 1st stage compressor for evidence of Foreign Object damage (FOD), corrosion and contamination shall be carried out at intervals not to exceed 220 hours time in service; and