What about the “Out of Phase” Maintenance Items?

CAR 625 Appendix “C” lists the “out of phase items” that don’t form part of the aircraft’s annual inspection. O-M aircraft are required to comply with the requirements of this appendix. Most of the items are fairly straightforward and within the capabilities of most pilot/owners, but some items require specialized equipment. Pilot/owners may want to contract out that work to specialty shops.

A review of CAR 625 Appendix “C” is a good idea to plan your maintenance requirements and ensure that you don’t miss anything. You can find the documents at http://www.tc.gc.ca/aviation/regserv/carac/CARS/cars/a625ce.htm
Here are some of the key items that may require outside assistance to complete the requirements:

  1. Variable Pitch Propellers – to be overhauled every ten years
  2. Tachometers – to be calibrated annually – this will require a “tach check” or other calibration device.
  3. Compass calibration – every 12 months – requires a compass rose or ground compass system and an assistant to complete.
  4. ELT – must be bench-tested annually in accordance with Appendix G of Chapter 571 of the Airworthiness Manual. This involves a bench-test of power output and frequency stability and generally cannot be completed by the pilot/owner
  5. Altimeters used for IFR flight or VFR in Class “B” airspace – calibrated every 24 months
  6. Transponders and Mode “C” encoders (when installed) – calibrated every 24 months in accordance with Appendix F of Chapter 571 of the Airworthiness Manual. This involves a bench test and also generally cannot be completed by the pilot/owner unless you have access to specialized equipment.


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