Systems Exam Focused Review Flashcards
What is powered by the battery master switch when it is turned on? (4)
DC Battery bus, APU battery direct boss, main battery direct boss, DC emergency bus which houses fire protection (Squibs and extinguishers)
If you turn on the DC service which, what is powered?
The APU battery direct bus powers the DC service bus (Via the secret service bus contactor)
What would cause an IDG Fault light?
HOT/LOP
When would you manually disconnect an IDG?
During a HOT/LOP condition, QRH directed
With the IDG ever automatically disconnect?
Yeah ! During severe over temperature or severe over torque
During an AC ESS XFER With normal logic, what is powering the AC essential bus?
AC bus 2
What does XFER FAIL, GEN 1, IDG 1 caution mean to us?
That there was a short circuit, and the automatic transfer was inhibited on purpose, to protect the other systems from being short circuited
If there are multiple TRU failures, what Ty will close?
The DC cross tie
When will be ADG deploy and supply power to the AC ESS BUS?
If AC BUS 1 and AC BUS 2 fail
If the ADG is deployed, What is powered?
ADG bus, hydraulic pump 3B, AC ESS BUS, ESS TRU 1, DC ESS BUS, DC BATT BUS (via ESS TIE)
If the ADG is deployed, and ESS TRU1 fails, what is the backup?
ESS TRU2 Transfer Contactor awakens, and connects the AC ESS BUS to the ESS TRU2
If the fuel pumps are on - What does that mean?
They are ARMED and monitoring for low pressure to trigger activation.
If the hydraulic ACMP B pumps are on, what does that mean?
They are operating to output 3000 psi, they are NOT automatically responsive to low pressure.
What conditions will trigger the transfer ejector pumps to activate?
If fuel is available in the center tank, & wing tank below 94% (93% or less) capacity until 97% capacity is achieved.
What condition will automatically trigger the powered crossflow pump?
A fuel balance between wing tanks of 200 pounds, automatically stops when the low tank is 50 pounds over the other tank.
When will the ACMP B pumps run in the AUTO switch position?
When it’s bus is powered, and the flaps are out of 0° (or an 8° Flaps/slats position)
AKA when you’re taxiing (;
When will the ADG deploy?
When there was a loss of all AC power
How is the APU cooled?
It has its own oil cooler
If the anti-ice wing cross bleed valve fails, what position will it be in?
It fails to the last selected position
If the Cowl anti-ice bleed fails, what position is it in?
The bleed fails open
What are the 3 exceptions to the dual loop fire system?
Cowls use pressure transducers, the last 3 feet of the wings are temperature sensors, the gear is a single loop system.
If you turn the wing anti-ice on, What change in the N2 gauge will you see it?
You will see a white arc appear. This is just a switch position indication. 
When will you see the APU AVAIL light illuminate?
When the starter has cut out, and RPM is at 99% for 2 seconds!
Means the APU is ready for electrical loading.
What does a green advisory ICE message mean?
It means that our anti-system is on, and ice is still being detected.
Where are the emergency shut offs for the APU?
Inside the APU enclosure/compartment, and the external services panel.
What is the procedure for elevator PCU runaway?
There is no procedure!
There are 3 PCU’s per elevator, if one PCU goes bad the other 2 will overpower it automatically.
you receive LOW FUEL caution, what does this mean?
There is -/= 600lbs in the left and/or right wing, there is -/= 1200 pounds total, or there is low fuel in the collector tank.
What is the maximum fuel imbalance allowed between the left and right wing tank?
On take off = 300 pounds, all other phases = 800 pounds
How does the APU oil cooler work?
Discharging RAM air into the compartment then exhausting it overboard through an EDUCTOR
Approach BIT
Landing gear down OR Flaps GREATER than 20°
Takeoff BIT
Thrust levers out of TOGA, & landing gear up & locked/WOW, & Flaps 20° or less
How many anti-ice sensing probes are there?
2 - only 1 signal is needed to generate a caution/advisory
What would “L WING A/I” caution mean? 
insufficient temperature detected
What do the anti-ice leak detection control (AILC) dual channels do?
Maintain the correct temperature on leading edges by varying bleed air amount
What position will the wing anti-ice cross bleed valve fail to?
It will fail to the last selected position
When will the wing anti-ice valves close?(4) 
- Bleed MISCONFIG
- Loss of electrical power at the valve
- DUCT failure! (Fail closed)
- Bleed air supply pressure is removed
What happens when you press START/STOP - IN for the APU? (3)
- Starter energized and start illuminates,
- start extinguishers at 50% RPM,
- 99% for 2 seconds the AVAIL illuminates in green
What happens when you press START/STOP - OUT for the APU? (3)
- SOV closes
- AVAIL light extinguished
- APU Shuts down 
Who is the APUs best friend?
ECU (One cannot live without the other)
When will a trim CLACKER activate?
After 3 seconds of trim Input/the AP senses a trim runaway
What kind of action does a warning require?
Immediate
What kind of action does a caution require? Can you box a caution message?
Prompt action. You can box a caution and it will remain boxed if others are displayed.
When is the cockpit voice recorder activated?
As soon as DC Power is established (BATT MASTER ON)
At what percentage RPM will the FADEC alternator power itself?
50%
What are you looking for on the EICAS for APU shut down?
SOV closed, DOOR closed
What is motive flow?
Ejector pump‘s use motive flow which comes from the engine driven fuel pumps. It is suction created by low pressure that moves fuel out of the tank
Under what 5 conditions will the autopilot automatically disconnect?
YD fail, FCC 1/2 fail, Windshear warning, stall warning, unusual attitude
How does fuel get to the APU during non-normal situation?
By internal bypass valve, opens if the APU pump fails.
Allows AGB pumped to draw fuel for continuous operation.
When would a generator go off-line?
An over/under voltage
If BTMS is in the green, or white range what units does this represent?
00-06, 07-14
Over 14 = red, overheat
Where does RAM AIR go? (ECS)
Mixing manifold
What valves in the ECS system maintain 45 psi +/- 3?
PRSOVs
At what temperature do the recirculating fans turn on?
Below 30°C
When do you need conditioned air?
In the aft cargo compartment when it’s colder than 15°C outside because HEAT needs to be added.
When is antiskid active?
At 35 KTS spin up and WOW for 5 seconds,
How long do you have to comply with an RA maneuver?
5 seconds, & RA REVERSAL maneuver must be initiated within 2.5 seconds for an additional RA.
What are the differences between continuous ignition conditions and no flex thrust takeoff conditions?
Continuous ignition required: contaminate a runway, moderate or greater rain/turbulence, thunderstorms in the vicinity.
No flex Thrust takeoff: contaminated runway, anti-ice bleeds in use, windshear/downdrafts forecasted, antiskid inoperative
Where is the air turbine starter?
Mounted in the AGB
What system is the operability bleed valve connected to?
FADEC. Offloads the compressors to avoid stalls and surges
What does the air turbine starter do?
Converts pneumatic energy into mechanical motion for engine starting.
Disengages when N2 is approximately 50%, or stop switch pressed.
What are the 2 levels of compressor stall protection that FADEC provides?
- Continuous ignition of both A and B igniters
2. Operability bleed valve to offload the compressor
What are the CPCP absolute limitation functions?
Cabin pressure altitude of 15,000 feet, 3000 ft./min. rate of outflow valve
What cautions/warnings would you get regarding cabin pressure altitude?
8500 feet: “CABIN ALT” caution, smoking/seatbelt signs illuminate.
10,000: “CABIN ALT” warning
8.6 PSI differential: “DIFF PRESS” warning
What are the CPAM functions?
At cabin press alt of 14,000 +/- 300 feet the passenger masks will automatically drop. Supplies 13 minutes of oxygen.
Instructions to limit cabin altitude to 14,500 +/- 500’ 
What happens when you select ENG FIRE PUSH
GIV3S
Generator off-line, ignition inhibited, 3 SOVs closed, Squibs armed (ARM PUSH TO DISCH)
What is on the DC service bus?
NAV, LAV, dome, beacon
What is on the AC service bus?
APU charger, cabin side and ceiling lighting, toilet, water system
Is one operative generator enough to power the whole Aircraft?
Yes!
What is the maximum Continuous load a TRU can have?
120 A
What does the AGB power?
3 fluids: Fuel, oil and hydraulic pumps.
2 electric: IDG & FADEC Alternator
1 pneumatic: ATS
Each engine has its own FADEC: true or false
True
How many channels does FADEC have?
2
If you have a FADEC fault message, can you be dispatched?
NoooooOoOoo
