Ice and Rain Protection

AIRCRAFT ICE PROTECTION IS PROVIDED BY: Pneumatic system only. Electrical heating only. Electrical heating and pneumatic system.

ANTI ICING ELECTRICAL HEATING IS PROVIDED MAINLY BY ACW CURRENT FOR: Propeller blades, windshields and probes only. Propeller blades, windshields, probes, flight control horns. Propeller blades, windshields, probes, engine air intakes.

ON THE DE-ICING PANEL, THE AIR FRAME AIR BLEED PB: Must be IN, no OFF light, in order to operate engine and wing stabilizer boots. Can be OFF, OFF light on, in order to operate engine boots (engine de-icing selected ON). A + B are correct.

THE PURPOSE OF 'AIR FRAME AIR BLEED' IS?. To control DE ICE and ISOLATION VAL YES normal operation, PB pressed both DE ICE and ISOLATION VALVES are open. To permit a detection of an ENGINE or AIR FRAME DE ICE SYSTEM failure. A + B are correct.

BOTH, AIR FRAME AND ENGINE DE ICING SELECTED ON, THEY ARE: De iced simultaneously. De iced sequentially. Totally independent one from each other.

MODE SEL AUTO IN 'MAN' ON THE DE ICING PANEL; WHEN SHOULD THE 'MODE SEL PB' BE 'ON'?. If SAT above -20 C; causes a cycle length of 60 sec. If SAT below -20 C; causes a cycle length of 60 sec. If SAT below -20 C; causes a cycle length of 180 sec.

WITH ONE ENGINE INOPERATIVE, ARE BOTH SIDES OF THE 'AIR FRAME DE ICING SYSTEM' SUPPLIED?. No. Yes. Yes, provide that fire handle has been pulled.

AIRCRAFT IN FLIGHT, IF THE 'AAS' SYSTEM DETECTS ICE WHILE ICING 'AOA' GREEN LIGHT IS EXTINGUISHED: The amber ICING light illuminates steady, MASTER CAUTION and single chime. The amber ICING light illuminates flashing, MASTER CAUTION and single chime. The green ICING AOA illuminates.

FAULT LIGHT IN AIRFRAME AIR BLEED 'PB' ILLUMINATES AMBER AND 'CCAS' IS ACTIVATED WHEN: Air pressure downstream of the de-ice valves stays below 14 PSI, more than 10 sec., or air temperature upstream of the de-ice valves exceeds 230degrees C. Inflation sequence of AIRFRAME BOOTS A or B is not correct. A + B are correct.

DE ICING OVERRIDE 'PB' IN 'OVRD' POSITION: By-passes the MFC modules logic and a timing cycle of 60 sec is selected. It is used only when associated fault light is illuminated. A + B are correct.

MODE SEL AUTO PB IN 'MAN' POSITION: The DE ICING MODE SEL pb is inoperative, (FAST mode is automatically activated). DE ICING MODE SEL pb is operative and allows the crew to select the appropriate timing cycle, depending on SAT. Is used when ADC + MFC failure occurs, in this case the FAST mode is automatically activated.

NORMAL OPERATION, WHEN IS IT POSSIBLE TO USE PROPELLER ANTI ICING?. Only when NP are above 63%. Only when both engines are running. Only when SAT is below zero.

PROPELLER ANTI ICING MODE SELECTOR, SELECTED 'ON': Blades heating is 20 sec. long according to a cycle of 80 sec. Blades heating is 10 sec. long according to a cycle of 70 sec. Blades heating duration is the same but more frequent.

STALL ALERT THRESHOLD IS REDUCED FROM NORMAL OPERATION TO ICING OPERATION AS SOON AS: Ice accretion is detected. Propellers and horns anti icing are selected ON. At least one horn anti icing is selected ON.

WHEN DOES THE GREEN LIGHT'AOA' DISAPPEAR?. Automatically, at the end of ice accretion, ICING amber light OFF. Automatically, after horns anti ice OFF selection. Manually by depressing AOA green light PB, after it is visually confirmed that the aircraft is clear of any residual ice.

TO PREVENT THE FORMATION OF ICE ON AIR DATA SENSORS, ELECTRICAL PROBE HEATING IS PROVIDED FOR: CAPT, F/O, STBY pitot tubes (3) and static ports (6) only. CAPT, F/O, STBY pitot tubes (3) and static ports (6), CAPT and FIO angle of attack probes (2), plus TAT (total air temperature) probes (2) in flight only. B is correct, but TAT probe is heated on ground and in flight.

PITOTS, PROBES AND STATIC PORTS ARE: Heated and monitored by CCAS on ground and in flight (except static ports monitored by CCAS on ground only). Heated on ground and in flight but not monitored by CCAS. Heated and monitored in flight only.

PROBES HEATING AND WINDSHIELD HEATING PB'ON' IN HOTEL MODE OPERATION: Pitots, TAT, angle of attack, probes are heated. Windshields are heated. Static ports and STBY pitot are heated.

YOU CAN USE WINDSHIELD WIPERS: Below 180 Kt. Below 160 Kt. At any speed.

IS IT POSSIBLE TO USE PROPELLER ANTI ICING ON GROUND: Yes, only if Np > 63%. Yes, but only when both engines are running. No.

NO EXT. PWR. ENG. STOPPED, TO PRESSURIZE BRAKE ACCUMULATOR: Switch ON BAT and depress GREEN PUMP Pb. Switch ON BAT, AUX PUMP start automatically. Press AUX HUD PUMP on pedestal.