Electrical Flashcards
1
Q
How many generators do we have?
A
4 engine and 1 apu
2
Q
How many amps do the engine generators provide?
A
400 amps
3
Q
How many amps does the APU generator provide?
A
400 amps up to 30k feet and 300 amps above 30k
4
Q
What’s the min battery temp to start the APU?
A
-20 degrees Celsius
5
Q
Minimum voltage to start APU off the batteries?
A
22 volts
6
Q
If battery is below 22 volts, how do you start APU?
A
Ask for a ground power unit (GPU)
7
Q
How many gens do we have to lose to lose shed bus?
A
2 or 3 gens (including APU gen)
8
Q
Does the shed bus override knob work in flight?
A
No
9
Q
When does the shed bus go online?
A
Normal electrical conditions, otherwise on the ground with at least 1 generator online.
10
Q
Shed bus knob. What do the different positions do?
A
OFF - de-energizes shed bus manually
AUTO - electrical distribution logic (EDL) controls shed bus contactors
OVRD - closes shed bus contactors provided the acft is on the ground and at least 1 generator is online.
11
Q
Essential Power button. What happens when you press it?
A
Depressed - Overrides EDL to force both Ess bus contactors to their “electrical emergency” positions and connects the batteries directly to the Ess buses. White stripe illuminates.
12
Q
QRH - Loss of all generators
A
Airspeed - Max 250 kias Altitude - MEA or 10,000 ft, whichever is higher Essential Power - ON Crew Oxygen - as required Passenger Oxygen - as required Emergency Lights - OFF Land at the nearest suitable airport ***see the rest in QRH***
13
Q
What does Essential bus power?
A
EICAS
RMUs
ISIS
14
Q
How are emergency lights powered?
A
4 dedicated batteries
15
Q
How long are emergency lights powered?
A
Approximately 15 minutes
16
Q
If electrical emergency at 37,000 ft, and emergency lights come on, what do you do?
A
Descend to 30,000 ft so you can start the APU and use its generator.
17
Q
What does turning on the red beacon light do?
A
It starts the flight data recorder on the ground.
18
Q
What does pulling the fire handle do?
A
Hydraulic shutoff valve - closes associated
Engine bleed valve - closes associated
Engine inlet anti-ice valve - closes
Fuel shutoff valve (at the wing root)- closes
19
Q
What powers the valves that fire handles closes?
A
Hydraulic shutoff - hot bus
Fuel shutoff - hot bus
Bleed valve - essential bus
Inlet anti-ice valve - DC bus
20
Q
What’s on the hot bus?
A
Fuel shutoff valve, hydraulic shutoff valve, fire extinguishers, ELT, refueling courtesy and main door lights.
21
Q
Fire test button pushed, what happens?
A
Fire bell rings, fire handle lights, bagg extg lights, Master Warning and Master Caution lights and EICAS messages appear.
22
Q
What EICAS messages appear on fire test?
A
E1-2 Fire APU Fire BAGG SMOKE E1-2 FIREDET FAIL APU FIREDET FAIL
23
Q
ENG1 FIRE message disappears and replaced by ENG1 FIREDET FAIL message.
A
Treat it as an engine fire and run the engine fire memory item.
24
Q
Memory item: Engine fire, severe damage or separation.
A
Assoc thrust lever - IDLE
Assoc Start/Stop Selector - STOP
Assoc Fire Extg Handle - PULL (DO NOT ROTATE)
25
You're taxiing out and you get APU FIRE message, the FA calls and says there is smoke in the back. The captain has passed out. What do you do?
Stop the airplane and evacuate.
26
Can fuel be transferred from one tank to the other?
NO
27
Where are the fuel pumps located?
In the collector box at the wing root.
28
When can we not have the fuel xfeed knob in xfeed?
1. ) Takeoff
2. ) Go-around
3. ) Landing
29
How is fuel moved through the wings?
From the tip to the root via gravity.
30
What keeps fuel from going back from root to tip?
One-way flapper valves.
31
What do fuel pumps do other than supply the engines?
Supplies the compressor variable geometry (CVG)? Also supplies the fuel cooled oil cooler (FCOC)?
32
How much fuel is in each wing?
5717 lbs.
33
Unusable fuel in each wing?
39 lbs.
34
Unusable fuel with one pump inop?
365 lbs.
35
At 5,000 ft, you hit turbulence. What airspeed?
200 kias
36
At 30,000 ft you hit turbulence, what airspeed?
250 kias or .63 mach whichever is lower
37
If we hit turbulence and you need to communicate to FA to take a seat, what do you do?
Press the ATTD CALL ICU button overhead twice. Signals four ding dongs.
38
For the powerplant in flight, when do we turn ON igniters instead of AUTO?
Turbulence or rain.
39
If in icing conditions and we don't tell FADEC to takeoff in icing conditions, what could that mean to us?
If you enter icing conditions and the anti-ice kicks on, you'll have a loss of thrust, which makes your takeoff data invalid and especially bad if you lose an engine.
40
On takeoff, you rotate at Vr, the elevator freezes around 10 degrees, what do you do?
Jammed elevator:
| Elevator disconnect - PULL
41
What does takeoff data assume?
Loss of an engine on takeoff.
42
In an emergency, what buttons do you press and how many times to communicate with FA?
ATTD CALL button twice and CABIN EMER once.
43
Max altitude to start the APU?
30,000'
44
EGT limitations for APU start/continous operation?
Max to start 884 deg C. Continuous ops 680 deg C (717 deg C up to 5 mins)
45
Memory item - APU fire
APU fuel shutoff valve - CLOSE
46
When do we load icing takeoff in Takeoff Data?
10 deg C or less AND visible moisture OR 10 deg C or less AND ceiling 1,500' AGL. Contaminated runway.
47
What does the FADEC do when icing takeoff selected?
Reduces takeoff thrust to allow for Anti-Ice to kick on during takeoff.
48
What conditions to turn igniters to ON? On the ground.
Turbulence and/or rain. Aircart or bottle start. Starting Cold engine AND 10 deg C or less.
49
Engine warm up.
Prior to t/o, run at low thrust or idle 4 mins for cold engine or 2 mins for warm engine. To increase N2 above 83%, engine oil min temp 40 deg C or run the engine at least 8 mins.
50
Why would we turn off the guarded hyd sys button?
Hydraulic fluid overheat.
51
Difference between engine driven and electric hydraulic pump?
Engine driven - 3000 psi piston type
| Electric driven - 2900 psi impeller type and output volume 1/10 of fluid pushed out by engine driven.
52
Difference between hyd sys 1 and hyd sys 2?
Hydraulic system 1 has a priority valve. Each one has some different component they service - i.e. inboard/outboard brakes and spoilers and landing gear and emergency brakes.
53
What does the priority valve prioritize?
Prioritizes the flight controls in case engine driven pump fails and electric pump takes over. Restricts hydraulic fluid to the landing gear during retraction. Retraction is slow.
54
How many accumulators are on each hyd system?
One accumulator per system.
55
What does the hyd accumulator do?
Accumulators keep the surges of the hydraulic pumps at a minimum and to keep 3000 psi pressure available for operations of landing gear and main door (sys #1) and the emergency parking brake (sys #2).
56
Does emergency brake have any protections?
No.
57
Does the normal brakes have any protections?
Yes.
58
If CA has his feet on toe brakes after landing, will your tires blow? What protection?
No. Touchdown protection. Wheel brakes de-activated until one of two events occur:
1. ) WOW + 3 secs OR
2. ) Wheel speed of 50 kts.
59
What other protections does brakes have?
1. ) Anti-skid - wheel speed >10kts. Average all 4 main wheels. If one falls below average, brake pressure is reduced on that wheel until speed returns to average.
2. ) Locked wheel - wheel speed >30kts. If one wheel is 30% slower than the others, then full brake release for that wheel until it recovers speed.
3. ) Touchdown - prevents wheel brakes from activating while airborne until one of two events occur (whichever is first) (a) WOW + 3 secs or (b) wheel speed of 50 kts.
60
What is rudder "hardover"?
Uncommanded move of the rudder of more than 5 degrees deflection.
61
Hardover protection?
Shuts off all hydraulic power to the rudder and reverts rudder to mechanical mode. Occurs when:
1. ) Rudder deflects more than 5 degrees.
2. ) Opposite direction pedal force of >130 lbs.
3. ) Both engines N2 above 56%
62
Ice Test procedures:
```
Engine bleeds - OPEN
APU bleed - CLOSED
PACKS - ON
Ice Detection Override Knob - ALL
Thrust levers - 83% N2
Ice Det Test Knob - 1 then 2 (not more than 15 secs)
```
Observe the following indication on both sides:
1.) OPEN inscription on ENG, WING, and STAB
2.) EICAS messages:
ICE DET 1(2) FAIL - caution
BLD 1(2) LOW TEMP - caution
ICE CONDITION - advisory
CROSS BLD OPEN (may be displayed) - advisory
Thrust levers - IDLE
Ice Det Override Knob - AUTO or ENG
Engine and APU bleeds - as required
63
Ice Detection Knob to ENG?
Opens engine inlet anti-ice valves. Above 25 kts wheel speed, WING/STAB anti-ice valves are opened if ice is detected.
64
Ice Detection Knob to ALL?
Above 25 kts, opens all pneumatic anti-ice valves. Below 25 kts, opens only the engine inlet anti-ice valve
65
Ice Detection Knob to AUTO?
Allows automatic operation of the anti-ice system.
66
Oil pressure limits:
Below and at or above 88% N2 - 110 psi
Below 88% N2, can be exceeded if oil temp is below 21 deg C and engine in IDLE until 110 psi. Also amber 111 - 115 psi time limit is 5 mins. 116 - 155 psi time limit is 2 mins. Total above 110 psi cannot exceed 5 mins.
At or above 88% N2, 111 - 115 psi time limit 5 mins. 116 - 155 psi time limit is 2 mins. Total above 110 psi cannot exceed 5 mins.
67
How many gasper fans are there?
One
68
Gasper fan on the ground?
Turned on as soon as the associated DC bus is energized.
69
Gasper fan in flight?
Overhead button in AirCond/Pneumatic panel turns on/off in flight only.
70
Aileron/Roll Trim Runaway memory item:
Quick Disconnect Button - PRESS and HOLD
| Aileron Systems 1 and 2 - OFF
71
Jammed Aileron memory item: why?
Aileron Disconnect - PULL
| Disconnects the jammed side from the free side, allowing the free side to be commanded.
72
Takeoff config: what does it look for?
Flaps - 9 degrees
Spoilers - closed
Trim - set green
Parking Brake - off
73
What powers the igniters on the engine?
PMA (Permanent Magnet Alternator) above 10% N2.
74
Other than the igniters, what else does PMA power?
1. ) FADECs at min 50% N2.
| 2. ) Thrust rating mode buttons in case of electrical emergency.
75
How many flap panels are there?
Two (double slotted) flap panels on each wing.
76
How are flaps powered?
FPDU (Flap Power and Drive Unit) with two motors drive all the flap actuators through flexible shafts.
77
What if flaps move at different rates?
Velocity sensors installed at the end of the flexible shafts detect panel assymetry. In such case, the system is disabled.
78
Elevator trim after takeoff limitation? What if it's exceeded?
Keep trimmed within the green band. If exceeded, high loads on horizontal stabilizer may stall the HSA (Horizontal Stabilizer Actuator), inducing a temporary loss of pitch command.
79
Which speed brake panel open in flight?
Outboard panels
80
When can speed brakes open?
TLA (thrust lever angle) of both engines below 50 deg
81
Jammed elevator memory item:
Elevator disconnect - PULL
82
When is takeoff alternate required?
If the departure airport's weather is below Cat I landing minimums.
83
How far (or close) does the takeoff alternate be?
Must not be more than one (1) hour from the departure airport at normal cruising speed in still air with one (1) engine inoperative. (For Emb-145 it is about 250 nm).
84
When is a destination alternate required?
Forecasted WX one hour before and one hour after your ETA is less than 2,000' ceiling OR less than 3 miles visibility.
85
What are mins for these alternates?
Derived alternate mins for TSA:
Add 400 ft to MDA or DA and 1 sm to visibility for airports with at least 1 operational nav facility for straight-in non-prec app, or Cat I prec app, or when applicable, a circling app.
Add 200 to DA or MDA to higher of the two approaches and 1/2 sm visibility for airports with at least 2 operational nav facilities each providing straight in app to different suitable runways.
86
How do I know alternate airport is approved for use?
Listed in OPS SPEC C070 and authorized for that particular operation.
87
What is min fuel comprised of?
Burn (t/o to touchdown) + Alternate (200 lbs for Missed App) + Reserve + Holding fuels
88
What is DD?
Driftdown
89
What is DP?
Depresurization
90
Are we Method 1 or Method 2 for OFP?
Method 1 - Captain initiated Operational Flight Plan (OFP). Method 2 is dispatcher initiated.
91
Why are there two landing limitations listed in the OFP for each runway at destination?
One for flaps 22 and one for flaps 45.
92
What are the thrust rating mode buttons on the center pedestal? - AOM II page 564
It defines the available engine thrust at the existing ambient conditions.
CON - Max Continuous available when PA is above 300' above t/o altitude and no landing gear down and locked or PA is >1700' above t/o altitude. Inhibited on ground.
CLB and CRZ - available when PA is >500' above t/o altitude and no landing gear down and locked signal. Or when PA is >1700' above t/o alt and no OEI signal. Inhibited on the ground.
93
Minimum voltage for GPU to start the APU?
19 volts
