Cessna 1973 172 - Cabin Heating, Ventilating and Defrosting System; Shoulder Harnesses

To retract the flaps, place the flap switch in the UP position. The
switch will remain in the UP position without manual assistance due to an
over-center design of the switch. Full flap retraction in flight requires
approximately 7 seconds. More gradual flap retraction can be accom-
plished by intermittent operation of the flap switch to the UP position.
After full retraction, the switch is normally returned to the center off
position.
CABIN HEATING, VENTILATING AND
•DEFROSTING SYSTEM.
For cabin ventilation, pull the CABIN AIR knob out. To raise the air
temperature, pull the CABIN HT knob out approximately 1/4" to 1/2" for
a small amount of cabin heat. Additional heat is available by pulling the
knob out farther; maximum heat is available with the CABIN HT knob
pulled out and the CABIN AIR knob pushed full in. When no heat is desired
in the cabin, the CABINf HT knob is pushed full in.
Front cabin heat and ventilating air is supplied by outlet holes spaced
across a cabin manifold just forward of the pilot's and copilot's feet.
Rear cabin heat and air is supplied by two ducts from the manifold, one
extending down each side of the cabin to an outlet at the front door post af
floor level. Windshield defrost air is also supplied by a duct leading from
the cabin manifold.
Separate adjustable ventilators supply additional air; one near each
upper corner of the windshield supplies air for the pilot and copilot, and
two optional ventilators in the rear cabin ceiling supply air to the rear
seat passer^ers.
SHOULDER HARNESSES.
Shoulder harnesses are provided as standard equipment for the pilot
and front seat passenger, and as optional equipment for the rear seat
passengers.
Each front seat harness is attached to a rear door post just above
window line and is stowed above the cabin door. When stowed, the har-
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