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reach area with higher outside air temp.).
3.
Continue to move control surfaces to
maintain their moveability.
4.
Alternate Air ON
5.
Increase RPM to avoid icing of propeller
blades (observe maximum RPM)
6.
Cabin Heat ON
DEFROST
CAUTION
IN CASE OF ICING ON THE LEADING EDGE OF THE WING, THE STALL SPEED WILL INCREASE.
CAUTION
IN CASE OF ICING ON WING LEADING EDGE, ERRONEOUS INDICATING STALL WARNING SHOULD BE EXPECTED.
4. NORMAL PROCEDURES
4.4.0. General
The “Pitot Heat” system should be operated where meteorological conditions warrant its use and where government regulations require its operation.
As part of 4.4.1. Preflight Inspection: Walk Around, check the pitot probe insulating spacer for signs of charring near the pitot probe. If signs of overheating are present maintenance action will be required prior to flight.
4.4.4. Normal Operation Checklist
Before Taxiing: The Before Taxiing Checklist has been repeated in this section to include operations with “Pitot Heat” system installed.
Before Taxiing
1.
Avionics Master Switch ON
2.
Flight Instruments and Avionics set
3.
Engine Gauges check
4.
Voltmeter check, ensure needle is in the green arc. Increase RPM to achieve or turn OFF non-flight essential electrical consumers
5.
Warning Lights, Gen, Canopy, push to test
Start, EPU (if installed)
6.
Fuel Prime Check OFF
7.
Fuel Pump Check ON
8.
Pitot Heat Switch ON
9.
Pitot Heat Monitor Light ON, operational and dimmable
10.
Pitot Heat Switch OFF
11.
Parking Brake release
NOTE
The ground test of the pitot heat should be kept to the minimum length of time required to verify normal operation (max. 10 seconds). Operation of the pitot heat system on the ground is unnecessary and will shorten the life of the heaters.
CAUTION
WARM-UP ENGINE TO A MINIMUM OIL TEMPERATURE OF 75° F AT 1000 TO 1200 RPM (ALSO POSSIBLE DURING TAXI). DO NOT OPERATE ENGINE ABOVE 1000 RPM UNTIL AN OIL TEMPERATURE INDICATION IS REGISTERED.
5. PERFORMANCE
There is no change in airplane performance associated with pitot heat operation.
6. WEIGHT AND BALANCE
The weight and balance of the aircraft is not affected by operation.
7. DESCRIPTION OF THE AIRPLANE AND ITS SYSTEMS
7.12.1. Pitot Heat
The “Pitot Heat” system consists of heating elements imbedded in the Pitot Static Probe, a 15 amp circuit breaker, a control relay, thermal limit switches (HIGH and LOW), OFF/ON switch, and a GREEN LED monitor. The control relay closes and supplies electrical current to the Pitot Static Probe heaters when the PITOT SWITCH is set to ON and the LOW thermal limit switch is CLOSED. A current monitoring sensor confirms this by activating the GREEN LED monitor light. The LOW thermal limit switch with automatic reset will cycle the control relay if the system is ON and an overheat condition exists. If the LOW temperature limit switch activates it will inhibit Pitot Static Probe heater operation and the GREEN LED monitor will go OFF until the Pitot Static Probe temperature drops below approximately 50 degrees Celsius.
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本文链接地址：钻石20系列飞机维护手册 DA 20 SERIES AIRPLANE MAINTENANCE MANUAL(87)
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