ELECTRICAL Flashcards
- With only one generator available or if the electrical loads exceed power available (aircraft or external), ELMS automatically sheds AC loads by priority. What order of priority does ELMS use?
- Galleys first then utility busses followed by individual equipment items powered by main AC busses.
- What does an IDG power when its engine is started with the GEN CTRL switch ON?
- Its respective main bus is powered.
- The APU generator is identical to the IDG. If no other power source is available when the APU generator reaches operating speed, what does the APU generator automatically power?
- With no other power source available it connects to both main busses. If the primary external source is powering both main busses, the APU powers the left main bus. The APU and the secondary external cannot both provide power to the aircraft at the same time.
- When primary external power source voltage and frequency are within limits, and are not in use, the primary external power ___ light illuminates.
- AVAIL
- How is IDG drive disconnect accomplished?
- The IDG drive can be disconnected from the engine by pushing the respective DRIVE DISC switch. High generator drive temperature causes the IDG to disconnect automatically.
- The APU is automatically started in flight regardless of switch position when ______.
- Both AC transfer busses lose power.
- The ground handling bus is powered automatically by primary external power or APU generator. What does the bus power?
7.
Cargo Doors (except bulk cargo door)
Cargo handling system
Cargo lights
Refueling and defueling system
Potable water servicing and functionality
Lavatory servicing and functionality
- Pushing the CABIN/UTILITY power switch to OFF removes power from what items?
8.
Ground service bus (except main and APU battery chargers, and left forward fuel pump).
Utility busses
Galleys
Fluorescent cabin lighting
Beacon, logo and wing lights
Gaspen fan (200A/B, 322)
- Pushing the IFE/PASS SEAT power switch to OFF removes power from what items?
9.
IFE (all components)
WIFI
Passenger seats (including seat motor power, personal computer power outlets, and telephones)
322 Ground maneuvering cameras’
- The backup electrical system automatically powers one or both transfer busses when _______.
10.
The system is automatically tested after engine start.
Only one main AC generator available.
Power to one or both main AC busses is lost.
Approach mode (APP) is selected on the MCP.
- Each backup generator contains _____ permanent magnet generators (PMGs). The PMGs are reliable sources of electrical power and normally supply power to the ______.
- 2, flight control DC electrical system.
- The main DC electrical system uses transformer rectifier units (TRUs) to produce DC power. What normally powers TRUs?
- AC transfer busses.
- What does the standby electrical system power?
- Selected flight instruments, communications, navigation systems, and flight control system.
- The RAT can supply standby electrical power to C1 and C2 TRUs and hydraulic pressure simultaneously. If the RAT is unable to maintain RPM, what happens?
- The RAT generator electrical load is shed until RPM is satisfactory.
- How is the RAT deployed?
15.
Automatically if both AC transfer busses lose power or
Both engines are failed and center system hydraulic pressure is low or
All three hydraulic system pressures are low or
Manually using the RAM AIR TURBINE switch (hot battery or APU battery bus must be powered)
