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51 Cards in this Set
- Front
- Back
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AC power is provided by? |
2 IDG's APU generator External power
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How does the system get DC power? |
2 TRU's (transformer rectifier units) convert AC power to DC. |
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EXT Power Avail:
Light |
External power is plugged in, and all parameters are met for external power to power the aircraft. |
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IDG Drive:
Light |
High oil temp Low oil pressure |
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Gen Control Off:
Light |
Generator control breaker is open. |
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If APU is supplying power & another source such as external power is connected, what happens? |
The other source has priority, and the APU will not power the buses. |
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If the APU comes on line while one IDG is operating, how is the power distributed? |
The operating engine gen bus tie opens isolating the engine gen. The APU supplies the other side. |
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APU Gen:
Light |
APU is operating & the APU generator control breaker is open due to a fault - or - APU gen is selected off. |
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Bus Off:
Light |
Illuminates when the respective AC bus is unpowered. |
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Main bus powering priority? |
IDG APU gen Opposite IDG |
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What does the ground handling bus do? |
Powers components that are only necessary during ground operations. |
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How is the ground handling bus powered? |
It can be powered by the APU gen, or external power
If external power is connected, but not selected on, the ground handling bus will be powered.
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What does the ground service bus do? |
It is powered on the ground, or in flight. It powers both battery chargers plus other cabin and system loads. |
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How is the ground service bus powered? |
Powered from the right main AC bus.
Can be powered by the APU gen, or external power. |
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What do the Utility, and galley buses power? |
Ovens Hot plates Coffee makers Galley lighting |
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How are the utility buses powered, and controlled? |
They are powered by their respective buses, and controlled by the utility bus switches. |
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What else does do the utility bus switches control? |
Galley buses. |
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Utility Bus Off:
Light |
Utility, and galley buses are unpowered. |
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How can the galley buses be reset? |
By recycling the utility bus switches. |
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What is the purpose of the bus tie breakers? |
They ensure that no bus is powered by more than 1 source. |
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Bus Tie ISLN:
Light |
Bus tie is isolated, or bus tie breaker is open due to a fault. |
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When does load shedding occur? |
When the electrical system detects loads that exceed the power available. |
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Load shedding occurs in what sequence? |
Galley buses Utility buses Individual items powered by the main AC bus |
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When do utility buses shed? |
When a single source is powering the system. |
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What will shed when external power, or the APU are the only source of power? |
C HYD 2 pump |
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During first engine start, which buses automatically shed? |
The utility, and galley buses. |
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When will reset when? |
When the generator breaker closes, or the start selector switch trips from GND to AUTO. |
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During the 2nd engine start, does anything shed? |
The utility, and galley buses on the respective side. |
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How many batteries are on the 767? |
There are 2, a main battery, and APU battery. |
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Where are the batteries located? |
Main battery is in the FWD equipment bay. APU battery is in the AFT equipment bay. |
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Main, and APU batteries are paralleled to provide standby power of what duration? |
90 minutes. |
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Both the main, and APU batteries power which bus/buses? |
Hot battery bus. |
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The hot battery bus powers what? |
Fire extinguisher bottles Fuel shutoff valves Clocks RAT manual deployment Parking brake valve |
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When is the battery bus powered? |
It is powered at all times unless the battery is the only source of power, and battery switch is off. |
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Main Batt DISCH:
Light |
Illuminates when the main battery is supplying power to a DC bus, and the bus is not being charged. |
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Batt Off:
Light |
Illuminates if the battery switch is off after electrical power is established. |
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What else happens when AC power is supplied to the GND service bus? |
Both battery chargers operate. |
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Which bus does the main battery charger supply power to, and why? |
Hot battery bus in order to prevent depletion of the main battery. |
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If the aircraft has no AC power, and the battery switch is selected on, the main and APU batteries will power which buses? |
Hot battery bus Battery bus Standby buses |
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If the Battery switch is selected off once AC power is available, what happens with the hot battery bus? |
The hot battery bus is isolated from the rest of the system. |
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The BATT/STBY system can supply DC & AC power to critical systems in the event of a loss of normal DC & AC power. The system uses battery power to supply which buses? |
Hot battery bus Battery bus Standby DC bus Standby AC bus |
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What is used to convert DC power to AC power with the standby system? |
1 static inverter. |
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STBY Power Selector:
Off |
Standby buses are not powered. |
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STBY Power Selector:
Auto |
If AC power is lost, standby buses are powered by battery power. |
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STBY Power Selector:
Batt |
Standby buses are powered by main & APU batteries. Battery charger is no longer charging the battery. |
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STBY Power Bus Off:
Light
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Illuminates when either the AC or DC standby bus is not powered. |
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During autoland, the power source for the center buses will transfer to the inverter & hot battery bus when? |
One AP is engaged Other 2 AP's are armed At least 2 generators are operating |
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The CA & FO flight instrument transfer buses supply power to what? |
ADI/HSI Altimeter/Radar altimeter VSI/ASI/ILS Inst panel lights EFIS control panel L,R, and C symbol gens
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What does the HDG (Hydraulic driven generator) do? |
It operates in the event of a loss of both main AC buses. After a short time delay, power from the battery bus drives the HDG shutoff valve to open. Center hydraulic pressure then powers the HDG. |
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The HDG provides AC power to? |
L & R AC transfer bus Standby AC bus CA flight instrument bus |
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The HDG provides DC power to? |
Hot battery bus Battery bus Standby DC bus |
