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40 Cards in this Set
- Front
- Back
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Describe the Battery Feeder Fail Scenario:
BATTERY FDR FAIL: |
BATTERY FDR FAIL:
Battery feeder protection unit has failed or the c/b is popped. |
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What type and number of batteries we have in T-1?
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3 batteries: 24V/40 AMP lead acid as Main Battery, 24 V AHRS, 24 V Standby battery
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How long does the stby battery last for?
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30 minutes
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What is main difference between having Stby power and Emergency power?
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Pitch trim and gear position indications. Also, on stby you don’t have intercom, annunciators, flt deck lighting.
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What components are powered by the standby bus?
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(CRUISSE)
Co-pilot instrument lights, engine EFC start, left ITT, RTU 1, stby instruments, UHF radio CRUISSE (Copilot instrument lights, RTU 1,UHF 1 radio, ITT #1,Standby Altimeter Vibrator, Standby Attitude indicator, EFC (start)) |
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What components are powered by the emergency bus?
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SLEEVES
Selected left hand instruments, Landing Gear position, Engine ignition and Control (left engine only), Emergency Pitch Trim, VHF Nav 1,Engine Fire detection (fire bell only – not the warning lights), Standby Bus The major ones are: gear position indicators, emergency pitch trim, fire bell, left N1 and N2, nav 1, engine fire extinguishing capability. |
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What are the functions of the GCU?
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Ground fault protection, over voltage protection; reverse current protection and equalization circuit load
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What is the maximum generator load for one generator up to 32,500 ft, 32500-41000?
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400 Amps; 32,500-41-000 280 amps both operating 280 Amps per generator
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What do you lose when you lose all AC power?
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26V primary – pitch trim position; 115V primary- GPWS; 26V Primary shed-flap position, flap asymmetry detection/protection, LH& RH oil pressure, 115V primary shed is not used; 26V secondary-not used, 115V secondary-GRE.
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What causes the AC bus shed light to come on?
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Emergency bus powering #2 inverter and #1 inverter failed.
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What do you lose when you lose a generator?
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Nothing if the other generator is working.
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Initially, what do you lose when you lose both generators?
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Transfer fuel pumps, aux cool.
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What is the power source for non-GPU engine starts on the ground?
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First engine – battery; second engine - generator.
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What is the power source for starter assisted air starts?
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Battery.
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Where are the starter/generators located
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on in each engine's accessory drive gear(container)
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What is the minimum N2 to provide rated generator power output
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58%
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What ensures equalization of the system's load?
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The generator control unit (GCU), it also provide reverse-current protection and fault protection from over-voltage conditions and ground faults
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Battery
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24 volt, 40 ampere-hour lead-acid located in the aft fuselage compartment
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Placing the Battery switch to the EMER position
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disengages the battery relay and battery tie-in relay. . . the battery then supplies dc power through the emergency bus power relay to the emergency bus
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Battery feeder protection unit
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detects a ground fault that may occur in the battery and external power feeder and ground lines
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DC standby battery power
Items: |
CRUISE
Located in the nose, powers: copilot instrument light, RTU1, UHF radio ITT1, standby attitude indicator, standby altimeter vibrator, EFC |
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AHRS battery power
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24-vdc, lead-acid aux battery. Supplies 11min of power to either AHRS computer if the load bus power falls below a preset limit
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In the event of electrical system failure, excluding the aircraft battery placing the Battery switch to the EMER position
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causes the battery to power the emergency bus, standby bus, and standby battery
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26V AC primary shed bus
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Flap Position
LH Oil pressure RH Oil pressure |
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26V AC primary bus
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Pitch Trim Position
(26VAC Shed bus) |
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115V AC Primary Bus
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GPWS
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LH Load Bus (NO RAISE)
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LH Load Bus (NO RAISE)
Nonessentials (L) Overhead Panel Radio Masters (L) AHRS Inverter #1 Standby Bus Emergency Bus |
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RH Load Bus (IRON G)
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Inverter #2
Radio Masters (R) Overhead Panel Nonessentials (R) Galley Bus (R main) |
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Standby Bus
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Standby Bus (CRUISE)
Copilot Inst Lts RTU#1 UHF ITT (L) Stby att/alt EFC Eng Start |
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Emergency Bus
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(SLEEVES)
Selected left hand inst Landing gear lights Engine Fire bell/Cabin smoke Emergency Pitch Trim VHF (NAV1) Engine Ignition and Control Standby Bus |
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Describe the Battery Feeder Fail Scenario
BATTERY FDR FAIL + EMER BUS FDR FAIL + BATT CUTOFF: |
BATTERY FDR FAIL + EMER BUS FDR FAIL + BATT CUTOFF:
Battery fault caused it to be disconnected from emergency bus and DC power system |
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Describe the Battery Feeder Fail Scenario
BATTERY FDR FAIL + EMER BUS FDR FAIL: |
BATTERY FDR FAIL + EMER BUS FDR FAIL: Emergency bus feed line failed (c/b may be popped.) Battery connected to system but battery feeder protection unit lost power and Emergency bus is powered now from LH load bus only.
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While on emergency and/or standby power, the following hydraulic powered systems will not be functional:
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Normal landing gear extension
Flaps Speed brakes Anti-skid system |
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When the RH load bus loses power and the NO 1 inverter has also failed, ___
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A load shedding circuit is activated which cause the emergency bus to power the NO 2 inverter
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Illumination of the AC BUS SHED annunciator is advisory only and idicates a combination inverter/load bus malfunction that will ___
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will result in the loss of the flap position indicator and both oil pressure indicators.
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Do not reset popped ___ circuit breakers
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BUS FDR
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Electrical Fire
If it has not or cannot be visibly verified that the fire is extinguished, ___ |
land as soon as possible
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When both generator master switches are placed on EMER and the battery selected OFF, ___
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all electrical power except DC standby power is lost.
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L or R GEN OFF
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Left/Right Generator Inoperative
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BATT CUT OFF
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Battery Relay Open
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