2. Set the temperature control lever to the desired temperature setting. This controls the duct switch.
— Note —
If this control is set for ground operating comfort, it may be necessary to reposition it
after being airborne, since ram air will increase the ventilating airflow and heater
output.
3. To stop the heater operation, turn the heater switch to the “FAN” position. The heater will shut off and the
ventilating air blower will continue to operate. Allow the blower to operate for two minutes, this will cool
down the heater before turning the heater switch off and closing the air intake valve. Turn off master
switch.
MAINTENANCE SERVICE.
Instructions contained in this section consist of periodic inspection, adjustment, and minor corrections required
at normal designated intervals for the purpose of maintaining the heating system in peak operating condition.
These inspections assume that a heating system includes accessory components mentioned in preceding
paragraphs.
INSPECTION OF HEATER AND HEATER COMPONENTS.
PREFLIGHT AND/OR DAILY INSPECTION.
1. Inspect the ventilating air inlet, combustion air inlet, exhaust outlet and fuel drains for possible
obstructions. Make sure that all of these openings are clear of any restrictions and that no damage has
occurred to the exhaust, cold or hot fuel drains, water drain or fuel line drain.
2. Perform the HEATER SWITCH in the ON (or HEAT) position. The ventilating air blower and
combustion air blower should operate. Operate both combustion and ventilating air blowers and check
each for unusual current draw, noise or vibration.
—Note —
Proceed with the Heater System Operational Check in accordance with paragraph
titled “Operating Procedure”.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2 1 - 4 3 - 0 2
Page 21-14
Revised: May 15, 1989
1F5
PIPER AIRCRAFT
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