To ensure a smoother changeover from nor-
mal (automatic) operation, the copilot should
slowly turn the MANUAL CABIN ALTI-
TUDE CONTROL knob until cabin altitude
increases slightly, then slowly select the
GROUND TEST position on the PRESSUR-
IZATION CONTROL lever. If manual control
is ineffective, use the dump valve to control
pressurization.
DUMP VALVE Lever
The DUMP VALVE lever (Figure 12-6), lo-
cated on the right side of the center control
pedestal, can be used to open or close a but-
terfly valve in a duct between the vestibule and
nose gear bay. The lever can be positioned
anywhere in between the OPEN and SHUT
positions to vary the exhausting of cabin air.
With the DUMP VALVE lever in the full OPEN
position, it operates in conjunction with the
ram-air valve to provide ventilation when the
cabin is unpressurized during flight.
OPERATION
BEFORE STARTING ENGINES
Check that the DUMP VALVE lever is shut,
and that the PRESSURIZATION CONTROL
lever is in the NORMAL flight position, and
that the MANUAL CABIN ALTITUDE CON-
TROL is in the full DECREASE position. Set
the F/DK VLV switch to CLOSE, CABIN
FLOOD switch to CLOSE, and the PRESSN
switch to AUTO. Check that both MAIN AIR
VLV switches are at CLOSE and both MAIN
AIR VALVE annunciators are extinguished.
Preset the CABIN TEMP selector to the re-
quired temperature on the AUTO scale.
If cruising at altitudes above 25,000 feet, ro-
tate the pressure controller CABIN knob to set
the inner scale of the CABIN CONTROLLER
to cruise al2,000 feet.
If cruising at altitudes below 25,000 feet, set
the cabin pointer to 2,000 feet above departure
airfield altitude.
In all cases the selected cabin altitude must be
at least 1,000 feet above airfield altitude.
Set the RATE knob at midtravel.
AFTER STARTING ENGINES
Introduce air circulation by setting both
MAIN AIR VLV switches to OPEN; check
that both MAIN AIR VALVE annunciators
are on, or APU AIR VLV to OPEN. Adjust
the temperature selector if required. The
F/DK VLV switch can be used for rapid heat-
ing of the flight deck.
12-6
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Figure 12-6. DUMP VALVE Lever
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