770、确保螺栓上的标记与手柄上的标记水平

553、If there are metal particles in the oil filter, examine the filter element for wear.

552、If the values are different, do this test.

551、If the Specification is used to prepare a Continuing Airworthiness Program for acceptance by an airworthiness authority other than FAA the appropriate authority and its regulations may be substituted.

550、If the pump Tis unserviceable ,replace it

549、if the probes touch each other ,they can become demagnetized

548、If the indications do not clearly show that a fastener is loose, make a red line across the head and the adjacent material.

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.