In the description of the airplane＇s Vacuum or Pneumatic System, how the system can be checked shall be explained.

During the APU operation, examine the oil temperature sensor for signs of oil leakage.

The system must be deactivated in order to prevent the thrust reverser from operating accidentally.

Make sure the girt bar is not engaged in the floor-mounted escape slide brackets.

He removed the access panel to see the corroded tube.

It is a must to check the relevant pump when metal chips are found.

The ignition unit is cooled by the air taken from the fan duct.

Drains let fuel in the vent system return to the tanks.

The microprocessor cards are interchangeable.

To obey the regulations is very important for aircraft maintenance activity.

The system to be tested operated abnormally during last flight leg.