Cabin Heat Firewall Shutoff Knob; Vent Air Control Knobs - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

SECTION 7
AIRPLANE AND SYSTEMS DESCRIPTION
CABIN HEATING, VENTILATING AND DEFROSTING
SYSTEM
(Continued)

CABIN HEAT FIREWALL SHUTOFF KNOB

A push-pull shutoff knob, labeled CABIN HEAT FIREWALL SHUTOFF,
PULL OFF, is located on the lower right side of the control pedestal.
When pulled out, the knob actuates two firewall shutoff valves, one in
the bleed air supply line to the cabin heating system and one in the
cabin return air line, to the off position. This knob should normally be
pushed in unless a fire is suspected in the engine compartment.
Do not place the CABIN HEAT FIREWALL SHUTOFF
knob in the OFF position when the MIXING AIR control
is in the GRD position because a compressor stall will
occur at low power settings when the compressor bleed
valve is open. The engine must be shut down to relieve
back pressure on the valves prior to opening the
valves.

VENT AIR CONTROL KNOBS

Two vent air control knobs, labeled VENT AIR, are located on the
overhead console. The knobs control the operation of the shutoff valves
in each wing which control the flow of ventilating air to the cabin. The
knob on the right side of the console controls the right wing shutoff
valve and similarly, the knob on the left side controls the left wing
shutoff valve. When the VENT AIR control knobs are rotated to the
CLOSE position, the wing shutoff valves are closed; rotating the knobs
to the OPEN position progressively opens the wing shutoff valves.
When the optional cabin ventilation fans are installed, rotating the
knobs to the full OPEN position also turns on the ventilation fans.
7-112
U.S.
CAUTION
CESSNA
MODEL 208B 867 SHP
GARMIN G1000
208BPHCUS-00