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Electrical
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- 1How many zone do air conditioning packs supplyThe airplane is divided into eight temperature zones
The flight deck,
six passenger cabin zones and
the forward cargo compartment - 2Which pack supplies the flight deck? And does the recirculation air go into the flight deck if both packs operate normally?The flight deck receives 100% fresh conditioned air from the left pack. The flight deck is maintained at a slightly higher pressure than the passenger cabin to prevent smoke and objectionable odors from entering the flight deck.
- 3A3 Which altitude does the cabin altitude assume, if cruise altitude is unavailable from FMC in AUTO?IF cruise altitude is unavailable from the FMC in AUTO, the cabin altitude controllers assume a cruise altitude of 39,000 feet.
- 4A4 What is the maximum cabin altitude in cabin altitude controller cruise mode ?In cabin altitude controller cruise mode , MAX cabin altitude is 8000 ft.
- 5Is the pack still able to maintain cabin pressurization when air cycle machine failedNO
- 6What equipment does bleed air supply for B777-300ERAir Conditioning, Pressurization and Trim Air, Wing Anti-Ice, Engine Anti-Ice,
Aft and Bulk Cargo Compartment, Air Driven Hydraulic Pumps, Hydraulic Reservoir Pressurization, Potable Water Tank Pressurization, TAT Probe Aspiration, Engine and APU Start Systems - 7How is the pack outlet temperature been controlledThe temperature zone requiring the coolest temperature controls the pack outlet temperature
- 8In flight - forward system is automatically reconfigured whenSmoke is detected in the forward equipment cooling system or forward quip ventilation system
Equipment cooing switch is off
Flow low flow is dejected in flight
Fan Both supply fans fail in the forward equipment ventilation system in flight
Fire forward cargo Fire extinguishing system is armed - 9When can engine anti-ice be operated manuallyPosition EGN anti-ice switches ON or OFF (ON GND, Manual must be used)
- 10When can wing anti-icing operated manually?Position wing anti-ice switches ON or OFF, in FLT only ( Inhibited on GND, regardless of switch position )
- 11When are flight deck windows electrically heatedWith switches ON, window heat operates as soon as power is available. Thermal shock prevented by gradual in crease in heating when power is applied
- 12When are pilot-static, angle of attack, and total air temperature electrically heatedThree pilot-static probes and two angle of attack probes are electrically heated for anti-icing protection when wither engine is operating.
The total air temperature probe is electrically heated for anti-icing protection in flight. - 13How many positions do windshield wipers have3 ( INT, LOW, HIGH)
- 14What protection features do fight deck windows haveFlight deck windows are electrically heated. the forward windshields have anti-ice
Thermal shock prevented by gradual in crease in heating when power is applied - 15How do engine anti-ice and wing anti-ice activated automaticallyTwo probes ( one on each side of forward fuselage ) automatically de-iced if ice-buildup is sensed.
When either probe detects ice buildup more than once, Engine anti-ice valves automatically open. Engine cowls are de-iced.
When either probe detects ice buildup several times, Wing anti-ice valves automatically open. Six wing leading edge slats ( three per wing ) de-iced - 16Describe the flight envelope protectionThere are three forms of flight envelope protection in the autopilot:
stall protection overspeed protection roll envelope bank angle protection An AUTOPILOT caution message and roll or pitch mode failures alert the pilot if the envelope is exceeded, and the autopilot prevents further envelope violations - 17Describe A/T wake up functionhe autothrottle can support stall protection when armed and not activated. If speed decreases to near stick shaker activation, the autothrottle automatically activates in the appropriate mode (SPD or THR REF) and advances thrust to maintain minimum maneuvering speed (approximately the top of the amber band) or the speed set in the mode control speed window, whichever is greater. The EICAS message AIRSPEED LOW displays. Note: When the pitch mode is FLCH or TOGA ,or the airplane is below 400 feet above the airport on takeoff, or below 100 feet radio altitude on approach, the autothrottle will not automatically activate.
- 18How many power sources can support full electrical loadingThe entire airplane AC electrical load can be supplied by any two main AC power sources
- 19How may generators does 777-300ER haveL & R ENG integrated drive generators ( IDG)
APU Generator
2 Backup Generators ( variable speed, variable frequency generator mounted on each ENG)
RAT - 20What displays do we have if the main battery is the only remaining power source
- 21What is the normal power source for PSA and FLT CTRLVariable frequency PMG AC power is used by individual power supply assemblies (PSAs) to provide DC power to the three flight control DC busses
- 22What is the normal power source for standby electrical systemThe main SBY electrical system consists of:
the main battery
the standby inverter
the RAT generator and its associated generator control unit
the C1 and C2 TRUs - 23What will happen if both AC transfer busses are unpoweredIf no other power source is available when the APU generator becomes available, the APU generator automatically connects to both main AC busses.
In flight, when both transfer busses are unpowered, the APU start automatically, regardless of APU selector position - 24Describe the difference between converter inverter and TRConverter ( 變頻 變壓 皆可 )
Inverter ( DC to AC )
TRU is used to convert AC in to relatively smooth DC - 25How does the electrical busses been isolated during autolandthe left IDG power the left AC transfer bus, the left main DC bus, and the captain’s flight instrument bus
the right IDG powers the battery bus and AC standby bus through the main battery charger
the backup system powers the right AC transfer bus, the right DC bus, and the first officer’s flight instrument bus - 26When will the IDG disconnect automatically and what EICAS messages will displayThe DRIVE light illuminates and the EICAS message ELEC GEN DRIVE L or R displays when low oil pressure is detected in an IDG.
High drive temperature cause the IDG to disconnect automatically. - 27NGS SYSTEM Shut down forENG OUT
Equipment Cooling switch is off
Cargo Fire Arm switch is ARMED - 28—
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- Fichas sobre Electrical, creado por Wesley Lin el 11/09/2015.
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- Wesley Lin
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