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25 Cards in this Set
- Front
- Back
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The AC system is primarily supplied by
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AC generators (alternators) producing 3-phase 115v at 400Hz up to 30kVA
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Each Generator is controlled by
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A Generator Control Unit (GCU) in conjunction with the related GEN switch
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AC bus 1 and AC bus 2 power supply priority is
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Onside generator, APU generator, offside generator, AC external power
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Illumination of the AC ESS XFER switchlight indicates
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Alternate power supply to the AC essential bus
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The AVAIL caption illuminates in the EXT. POWER AC switchlight indicates
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The external AC power applied to the aircraft is within limits and available for use
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Selecting the OFF/RESET position on a GEN switch
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Turns the generator off and resets the related generator control unit (GCU) after a protective generator shutdown
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The EMER PWR ONLY warning EICAS message means
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The ADG is deployed and producing power and AC bus 1 and AC bus 2 are not powered
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The ADG is deployed
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Automatically if both AC bus 1 and AC bus 2 become unpowered while airborne
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Pulling back the ADG handle
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Opens the ADG uplock via a cable
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Pushing the PWR TXFR OVERRIDE button on the ADG panel transfers
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The AC essential bus and hydraulic pump 3B to he operating APU or IDG
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Illumination of the amber FAIL caption in the left AUTOXFER switchlight indicates
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Due to AC bus 1 overload, power from the left generator is shut down and supply from the right generator is inhibited(AC bus 1 is isolated/unpowered)
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The AC utility buses are automatically loadshed when
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Operating on one generator and the flaps are extended while on the ground
One IDG generator is offline while airborne |
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The generator symbol on the AC ELECTRICAL synoptic page is
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White when the related engine is not running
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After ADG deployment
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The ADG cannot be retracted
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CBP 2 contains circuit breakers that protect components supplied from
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AC bus 2, DC bus 2, DC utility bus 2, AC utility bus 2 and battery bus
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The aircraft batteries are
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24V NICAD-type and are reated at 17 amp/hr(main) and 43 amp/hr(apu)
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DC external power
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Essentially substitutes for the APU battery
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In normal electrical system operation, the batteries
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Are isolated except for charging
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What buses are powered with only the BATT MASTER switch selected ON while on the ground(no generators or external power in use)
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Battery bus and emergency bus
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What buses are supplied by the batteries if power from all generators fails while airborne(including the ADG)
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Battery bus, DC essential bus, and the emergency bus
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Pushing the MAIN BUS TIE switchlight
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Allows DC bus 1 and DC bus 2 to recieve power from TRU 1 and/or TRU 2
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Failure of essential TRU 1 is indicated by
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The ESS TRU 1 FAIL status EICAS message
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Power to the EICAS displays and the engine and APU start control circuits is supplied from
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The battery bus
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The DC utility buses are loadshed
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When the DC BUS TIE swithclight is pushed on
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A hot APU battery is indicated by
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The APU BATT CHGR FAIL status EICAS message and the CHGR OFF annunciation on the DC ELECTRICAL synoptic page
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