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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 the paragraph titled “Operating Procedure”.
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100 HOUR INSPECTION.
The mandatory 100 Hour Inspection shall be conducted on new heaters or overhauled heaters with a new combustion tube assembly upon accumulation of 500 heater operating hours or twenty four months, whichever occurs first, and thereafter at intervals not to exceed 100 heater operating hours or twenty four months, whichever comes first. If an hourmeter is used on the heater assembly, it should be connected across terminals number 2 and 5 on the heater terminal strip. If an hourmeter is not used, count one heater operating hour for each two flight hours for normal aircraft operation. Consideration should be given for any excessive ground operation of the heating system.
— Note —
The 100 Hour Inspection consists of the functional check and inspection listed below and the Pressure Decay Test.
1.
Inspect the ventilating air and combustion air inlets and exhaust outlet for restrictions and security at the airplane skin line.
2.
Inspect the drain line to make sure it is free of obstructions. Run a wire through it if necessary to clear obstructions.
3.
Check all fuel lines for security at joints and shrouds, making sure that no evidence of leaks exists. Also check for security of attachment of fuel lines at the various attaching points in the airplane.
4.
Inspect electrical wiring at the heater terminal block and components for loose connections, possible chafing of insulation and security of attachment points.
5.
Inspect the high voltage cable connection at the spark plug to make sure it is tight. Examine the cable sheath for any possible indications of arcing, which would be evidenced by burning or discoloration of the sheath.
6.
Inspect the combustion air blower assembly for security of mounting, connecting tubing and wiring. Tighten any loose electrical terminals and air tube connections.
7.
Operate both the combustion and ventilating air blowers and check for unusual noise or vibrations.
8.
It is recommended that the condition of the spark plug be checked for operation as described in paragraph titled “Spark Plugs”.
9.
Evaluate the condition of the combustion chamber by performing a “Pressure Decay Test” as described in Janitrol Maintenance and Overhaul Manual P/N 24E25-l (Revision dated October 1981).
10.
Following the 100 hour inspection, perform the “Preflight and/or Daily Inspection”.
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