This document provides warnings and procedures for connecting a plane to a ground conditioned air supply. It warns that using ground air can cause positive cabin pressure buildup, and that doors opening uncontrolled due to this pressure could cause injury. It instructs to fully open the forward outflow valve and leave the cargo door cracked slightly to prevent cabin pressurization before connecting the ground air supply.

2. WARNING: THE USE OF GROUND
CONDITIONED AIR, WILL CAUSE A POSITIVE
CABIN PRESSURE DIFFERENTIAL. AN
UNCONTROLLED RATE OF DOOR OPENING
CAUSED BY A POSITIVE CABIN PRESSURE
DIFFERENTIAL MAY CAUSE BODILY HARM.
CAUTION: BEFORE CONNECTING GROUND
AIR CONNECTOR ENSURE THAT THE
FORWARD OUTFLOW VALVE ON THE FRONT
PRESSURE BULKHEAD IS FULLY OPEN TO
ALLOW CABIN PRESSURE TO RELIEVE WITH
THE AIR STAIR DOOR CLOASED.

3. PROCEDURES
• Turn FWD OUTFLOW VALVE selector, located on the copilot's
side console. To the OPEN position.
•On the appropriate side of the aircraft (depends on if the
aircraft has an APU) unlatch the air conditioning door to gain
access to the ground service air inlet.
•Connect the ground air connector to the ground service inlet,
ensuring that the lugs on the ground air connector engage with
the slots in the ground air inlet.
•Rotate the ground air connector clockwise until locked into
position.
• Repeat this process, in reverse order, to terminate the use of

5. Ground Conditioned Air
The use of ground conditioned air, (especially warm air),
will cause pressure buildup in a sealed cabin. An
uncontrolled rate of opening of the cabin door caused by
this pressure buildup can cause bodily harm.
Before connecting
ground air connector,
ensure ensure that
the cargo hold door is
left cracked to avoid
cabin pressurization.