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.
