Ice & Rain Protection Flashcards
AIRCRAFT PROTECTION IS PROVIDED BY:
ELECTRICAL HEATING AND PNEUMATIC SYSTEM
ANTI ICING ELECTRICAL HEATING IS PROVIDED MAINLY BY ACW CURRENT FOR:
PROPELLER BLADES, WINDSHIELDS, PROBES, FLIGHT CONTROL HORNS
ON THE DE-ICING PANEL, THE AIRFRAME 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)
THE PURPOSE OF “AIRFRAME AIR BLEED” IS:
TO CONTROL DE-ICE AND ISOLATION VALVES FOR NORMAL OPERATION. PB PRESSED
BOTH DE-ICE AND ISOLATION VALVES ARE OPEN
TO PERMIT A DETECTION OF AN ENGINE OR AIRFRAME DE-ICE SYSTEM FAILURE
TO PERMIT A DETECTION OF AIRFRAME DE-ICE SYSTEM FAILURE
BOTH, AIRFRAME AND ENGINE DE-ICING SELECTED ON, THEY ARE:
DE-ICED SEQUENTIALLY
DE-ICING LIGHT ILLUMINATES ON MEMO PANEL WHEN:
AIRFRAME DE-ICING IS SELECTED ON
MODE SEL AUTO IN “MAN” ON THE DE-ICING PANEL, WHEN SHOULD THE “MODE SEL PB” BE
“ON”:
IF SAT BELOW -20°C; CAUSES A CYCLE LENGTH OF 180 SEC
CAN YOU USE THE “PNEUMATIC DE-ICING SYSTEM” WITH BOTH ENGINE BLEED VALVES
“OFF”, ENGINES RUNNING?
YES
WITH ONE ENGINE INOPERATIVE, ARE BOTH SIDES OF THE “AIRFRAME DE-ICING SYSTEM”
SUPPLIED:
YES
AIRCRAFT IN FLIGHT, IF THE “AAS” SYSTEM DETECTS ICE WHILE ICING “AOA” GREEN LIGHT IS
EXTINGUISHED:
THE AMBER ICING LIGHT ILLUMINATES FLASHING, MASTER CAUTION AND SINGLE CHIME
AIRCRAFT IN FLIGHT, IF THE “AAS” SYSTEM DETECTS ICE, “AOA” GREEN LIGHT IS
ILLUMINATED:
THE AMBER ICING LIGHT ILLUMINATES STEADY, MASTER CAUTION AND SINGLE CHIME
AIRCRAFT IN FLIGHT, WE NOTICE THE BLUE LIGHT “DE-ICING” FLASHES ON MEMO PANEL:
THE AIRFRAME DE-ICING SYSTEM IS STILL “ON” FIVE MINUTES AFTER THE LAST ICE
ACCRETION IS DETECTED BY THE AAS SYSTEM
DE-ICING OVERRIDE “PB” IN “OVRD” POSITION:
BYPASSES THE MFC MODULES LOGIC AND A TIMING CYCLE OF 60 SEC IS SELECTED
IT IS USED ONLY WHEN ASSOCIATED FAULT LIGHT IS ILLUMINATED
MODE SEL AUTO PB IN “MAN” POSITION:
DE-ICING MODE SEL PB IS OPERATIVE AND ALLOWS THE CREW TO SELECT THE
APPROPRIATE TIMING CYCLE, DEPENDING ON SAT
NORMAL OPERATION, WHEN IS IT POSSIBLE TO USE PROPELLER ANTI-ICING:
ONLY WHEN NP ARE ABOVE 63%
PROPELLER ANTI-ICING MODE SELECTOR SELECTED “ON”:
BLADES HEATING IS 20 SEC LONG ACCORDING TO A CYCLE OF 80 SEC
STALL ALERT THRESHOLD IS REDUCED FROM NORMAL OPERATION TO ICING OPERATION AS
SOON AS:
AT LEAST ONE HORN ANTI-ICING IS SELECTED ON
WHEN DOES THE GREEN LIGHT “AOA” DISAPPEAR?
MANUALLY BY DEPRESSING AOA GREEN LIGHT PB, AFTER IT IS VISUALLY CONFIRMED
THAT HE AIRCRAFT IS CLEAR OF ANY RESIDUAL ICE
TO PREVENT FORMATION OF ICE ON AIR DATA SENSORS, ELECTRICAL PROBE HEATING IS
PROVIDED FOR:
CAPT, F/O, STBY PITOT TUBES (3) AND STATIC PORTS (6), CAPT AND F/O ANGLE OF
ATTACK PROBES (2), PLUS TAT (TOTAL AIR TEMPERATURE) PROBES (2) IN FLIGHT ONLY
PROBES HEATING AND WINDSHIELD HEATING PB “ON” IN HOTEL MODE OPERATION:
STATIC PORTS AND STBY PITOT ARE HEATED
YOU CAN USE WINDSHIELD WIPERS:
BELOW 160 KTS
