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13 Cards in this Set
- Front
- Back
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LE Hot Light |
PC: the wing leading edge skin temperature has exceeded 110°c. One of the six modulating valves is either stuck open or improperly modulating. ACTION: close all bleed air valves. Locate defective area with temperature selector. Open all modulating valves. When necessary, de-ice the entire wing using the bleed air valves. |
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Emp De-ice light |
PC: Parting strip power relay deenergized, cycling power relay deenergized, control relay deenergized, timer motor failure, empennage overheat condition. Open control power circuit breaker. ACTION: Turn switch off then on. If light remains on, turn switch to off, increase airspeed above 200 KIAS; vacate icing area. If light does not come back on, a temporary overheat exists. Continue operation. |
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Anti-icing light on with ctrl switch on |
PC: Fourteenth stage air of sufficient temperature to melt ice has entered the torquemeter shroud and the inlet scoop. |
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Anti-icing light off with ctrl switch on |
NO ANTI-ICING LIGHT: one or both areas of system may not be receiving air. ACTION: A. Check for horsepower drop. If normal continue operation. B. If less than normal: (1) check for ice buildup on air inlet scoop. If excessive, execute the emergency shutdown procedure. (2) If no ice buildup on air inlet scoop is observed, monitor shp, TIT, and fuel flow. Initial indications may be a gradual power loss followed by erratic operations. If either of these indications is observed, execute the emergency shutdown procedure. |
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Anti-icing light on and ctrl switch off |
A. Abnormal heat in the area. B. Loss of electrical power to the solenoid valve. ACTION: on deck, investigate, secure engine, and return to the line. In flight, turn on Anti-icing ctrl switch. A. If a shp drop is observed, execute the emergency shutdown procedure. B. If no shp drop is observed, continue engine operation. |
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Anti-icing light remains on after system utilization. |
PC: Failure of one or both thermal switches and/or anti-icing valves. ACTION: Allow sufficient time for thermal switch cooling prior to investigting. If no other abnormal indications exist, engine operation may be continued for the remainder of the flight. |
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Windshield heat Cycling light |
PC: Indicates that electrical power is being supplied to the windshield panels. When lights are out, electrical power is cycled off. ACTION: If unable to start cycling on a cold windshield, use override switch. |
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Side windshield heat FAIL light |
PC: Windshield power relay and/or overheat control relay stuck in energized position when control switch off. ACTION: Pull side windshield heat power circuit breaker on main AC Bus A. |
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L or R HTR OUT pitot heat out light |
PC: Indicates electrical current flow to the pitot heater element has been interrupted, or current flow detector is inoperative. ACTION: Check respective circuit breaker and bus. Monitor equipment for proper operation. |
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Bomb Bay Cold light |
PC: Temperature below desired level in bomb bay. ACTION: Turn Bombay Heat switch on (autocycling), open No.3 or No.4 engine bleed air valve. |
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Bomb Bay Hot light |
PC: Temperature above desired level, not cycling. ACTION: Turn Bombay Bay Heat switch off until light goes out, then heat bomb bay with switch in OVRD position. Monitor for proper operation. |
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Icing light |
PC: Indicates the ice detector probe is accumulating ice. The frequency of the light cycling indicates the amount of ice buildup. Long "off" period indicates a slow buildup. Light may illuminate at high angles of attack. ACTION: Anticipate icing conditions. |
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Master De-icing light |
PC: Alert or fault in de-icing system or bomb bay heating system (L or R Wing Hot, LE Hot, Emp De-ice, L or R pitot heater, or Bombay Hot or Cold). ACTION: Look for cause in de-icing systems on overhead Anti-icing control panel. Activate system or secure if necessary. Reset for continued warning protection. Get out of icing area if system is critical and inoperative. |
