The equipment cooling vent valve opens when the forward cargo heat valve closes.

Revisions are to be made consistent with the format of the specification using the provisions of FAR 21.50 as a basis.

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

To depressurize standby system, the hydraulic system A has to be depressurized to open the rudder hydraulic system selector valve, allowing hydraulic fluid flow to the lower rudder actuator.

The operational test for the HFS-900D transceivers is a BITE test which does a check of the internal functions of the HF transceiver.

The repair limits are not given because special equipment is necessary.

Adjust the potentiometer until you do not hear a hum from the loudspeaker.

If one or more blades are missing, make an entry in the engine logbook.

Electronic devices that are used in nearly all aircraft systems are the computer for system control and monitoring and the control inputs and indications in the cockpit and sensors throughout the whole aircraft.

The second method does not require pressurization of the pneumatic crossover manifold, but utilizes an external air source connected to the air charging valve manifold to pressurize the reservoirs for ground maintenance.

In some cases, the Specification is used to prepare a Continuing Airworthiness Program for acceptance by an airworthiness authority other than FAA.