17.7 Propeller Storage Flashcards
What must be done to propellers taken out of service?
They need to be protected against corrosion, moisture, and foreign debris ingress.
Where can you find preservation procedures for installed propellers?
In the Aircraft Maintenance Manual (AMM).
Where can you find preservation procedures for uninstalled propellers?
In the Propeller Maintenance Manual (PMM).
What are the typical storage periods for propellers?
Up to 3 months - short-term, 6 months - long-term, 12 months - long-term, 3 years - long-term.
What is required for installed wooden propellers during short-term storage?
They must be kept clean, inspected regularly, and stored horizontally.
What is the ideal temperature range for storing wooden propellers?
Between 10°C (50°F) and 20°C (68°F).
What must be done to metal fixed pitch propellers during short-term storage?
They require regular corrosion inspections.
What should be done to the pitch change mechanism of variable pitch propellers before engine shutdown?
It needs to be exercised to circulate the oil.
What treatment is required for external parts of propellers stored over 3 months?
They must be treated with lanolin or an approved anti-corrosive treatment.
What is the procedure for wooden propellers during long-term storage up to six months?
The procedure remains the same as for short-term storage.
What must be done to variable pitch propellers with pre-loaded bearings during long-term storage?
The blades must be rotated to prevent brinelling.
What is required for propellers stored for over twelve months?
Each year, the blades require exercising and inspection.
What is the procedure for uninstalled, dismantled propellers during long-term storage?
They do not require re-inhibiting every twelve months if in original packing.
What must be done to the exposed hub bore and splines of dismantled propellers?
They must be cleaned and treated with a corrosion inhibitor.
What should be done with all electrical connections and slip rings?
They must be cleaned and coated in petroleum jelly.
