Electrical System Flashcards
There are __ DC buses
15
There are __ AC buses
6`
The main aircraft battery is a __-volt, ___-____ battery
24-volt, lead-acid
Ops limits for GPU (volts & amps)
28-28.5 V, 1,000 to 1,500 amps
Generators provide __ volts and ___ amps.
28 V, 400 amps
Location of the main aircraft battery
Aft fuselage compartment
Location of the standby battery
Aircraft nose
With the Master L and R GEN switches in EMER, you will be down to…
… standby power only
Each inverter converts DC power to __ and ___-volt, ___ Hz AC power
26 and 115-volt, 400 Hz
What type of power (AC or DC) is used for most T-1A systems?
DC
Where are the generators located?
Engine accessory gearbox (lower front portion of engine)
Each generator has a ___ that controls starting & generating modes of operation
Generator Control Unit
How many inverters does the T-1A have?
2
What’s the visual cue that a push-pull circuit breaker has popped?
A white ring shows around the CB.
What are the 3 sources of DC power?
acft battery, external power, starter-generators
Starter-generator requires __% N2 to produce the rated power output
58%
The GCUs work together to ____ the load between the generators
equalize
GCU removes power from the starter at approximately….
35-40% N2
GCUs are located in the upper portion of the…
aft fuselage compartment
The aircraft battery is rated at __ ampere-hours
40
How many feeder lines are on each side of the aircraft?
3
How many feeder lines are normally active?
2
What causes L or R BUS FDR FAIL to illuminate?
The third (standby) feeder line has become active.
How many times can you reset BUS FDR circuit breakers?
0
Battery switch, in ON, power 3 relays:
Battery relay, Battery tie-in relay, Emergency bus power relay
On the Before Exterior Inspection, battery voltage should be…
22 to 24 volts
Don’t start 2nd engine until 1st generator load is below…
150 amps
Prestart, engine starting, and emergency power is provided by the aircraft…
…battery
External power receptacle is located…
… on lower left side of fuselage
The ____ provides ground fault protection & voltage regulation for generators.
GCU
The ___ provides a connection for all DC power
battery charge bus
The LH and RH bus-tie RCCBs tie the LH and RH ___ buses to the ___ bus
main; battery charge
What are the 2 primary buses for secondary power distribution?
load buses
Placing battery switch to EMER isolates the ___, & connects the battery to the ____bus
start bus; emergency bus
What’s the max operating load for 1 generator at FL200?
400 amps
What’s the max load for each generator on the ground?
280 amps
With 2 generators operating, what’s the max load for each?
280 amps
With only one generator operating in flight, up to 32,500 ft, what’s the max load?
400 amps
With only one generator operating in flight, above 32,500 ft, what’s the max load?
280 amps
Standby bus powers:
CP instrument lights; RTU #1, UHF radio, ITT #1, Stby altimeter vibrator, Stby ADI, EFC sys (CRUISSE)
Standby battery voltage:
24 volts
Standby bus is normally powered by…
… LH Load Bus
Standby power switch & indicator lights are on the ___ panel
right instrument
What buses can be powered by the standby battery?
Standby bus only
On the standby power switchlight, what does ON mean?
Standby battery is the only source powering standby bus
If the right load bus loses power, #2 inverter can be powered by…
…the emergency bus
Primary Shed buses disconnect when:
1 inverter isn’t supplying 115-v AC, #2 inverter is on, and #2 inverter is powered by emergency bus
During normal ops, leave the rotary AC voltmeter switch in ___ position
NO 1 INV - 115V
The #1 inverter is normally powered by what bus?
LH Load bus
Voltage & freq of the #2 inverter is regulated by the ___.
2 inverter internal circuitry
Normally, the secondary AC buses are powered by the ___.
2 inverter
The inverter selector switch has what 3 positions?
NO 1, AUTO, NO 2
What’s the color and location of the navigation lights?
2x red - left wingtip; 2x green - right wingtip, 1 white - back of vert stab
After gear retraction, how would you extend landing lights?
recycle switches: RET/OFF then EXT/ON
Max airspeed/altitude for the landing lights
200 KIAS / FL200
When should cabin general area floodlights automatically extinguish?
When aircraft is airborne, or when general area fluorescent lights illuminate
To arm instrument floodlights…
place integral switch to INTEG
Where is the anti-collision beacon? What color?
Top of vertical stabilizer. Red.
What are first indications of right generator failure?
MASTER CAUTION & R GEN OFF annunciators
With RH generator failure, what voltage should the voltmeter read for RH GEN position?
0
If you can’t reset a generator, maintain a minimum of __ N2 on the other engine
58%
What are the indicators of #2 Inverter failure?
MASTER CAUTION, INV 2 FAIL, and 0 volts for #2 positions on AC voltmeter
If smoke or fumes are present with an electrical fire, what’s the first step?
OXYGEN MASKS - DON/100%
On Elec. Fire checklist, after master gen switches -> EMER, batt -> OFF, what’s powered?
Stby bus only
