776、如果过滤器发生堵塞,应送去实验室分析污染情况

547、If the circuit breaker opens, de-energize circuit.

546、If the airplane has a built in auxiliary power unit, describe it and explain how it fits in with the electrical system.

545、If the airplane experiences repeated failures of ta pump at one location, there may be debris in the case drain line, case drain hose or case drain hose quick disconnect that cannot be flushed by accomplishing this procedure.

544、If the air intake flap is not serviceable, do the deactivation procedure of the air inlet valve.

543、If one or more blades are missing make an entry in the engine logbook

542、If it is possible that the temperature values will be more than the permitted limits, decrease the power.

541、If either of these devices is installed explain whether it is required equipment.

540、If an engine fire detection system is available.describe, give principle of operation, and explain how to use it.

539、If a supply shutoff valve was closed for less than five minutes no maintenance is required and shutoff periods are not accumulative.

538、If a company publication style manual is used, the format and layout should follow this Specification to the extent practicable