Study Guide Questions Flashcards
APU guaranteed Start up
39,000 ft
(May start up to 43,000 ft,
Max Operating ALT 45,000 ft)
What design features help guarantee an APU Airstart
1) Heated Oil Sump
2) Bleed Air Augmentation Valve
(Delays start for 15 sec when above 35,000 ft)
When does the APU generator come “online”
Once Reaching 99% RPM for 2 sec
When is APU bleed air available?
After reaching 100% for 1 min
APU bleed air for T/O is usable up to
1,500 ft AGL
What is the shutdown sequence for the APU below 20,000 ft?
1) It load-sheds Immediately
2) It Slowly winds down to 70% RPM over 1 min, then shuts-down
What is the shutdown sequence for the APU above 20,000 ft?
1) It load-sheds Immediately
2) Stays at 100% RPM for 1 min, then shuts-down
APU Max TGT for start
1050 C
APU Started cuts out at
46% RPM
APU fuel comes from
Left Tank
Can you start the APU with external DC power?
Yes (but multiple start attempts require 15 min between starts)
How many MAUs (Modular Avionics Unit) do we have
3 (16 Cards per MAU)
What do AGMs (Advanced Graphics Modules) do?
They take Data and create the images you see on the DUs (Display Units 1-4)
Where do the DUs get their power from
DU1 - Left ESS DC
DU2 - Left Main DC
DU3 - Right Main DC
DU4 - Right ESS DC
DUs 1 & 4 can be powered by
HMG if you have dual gen and APU gen failure
What is the Color of your Track (on Moving Map) until you reach the waypoint?
Magenta
What is the dotted Magenta Line?
Aircraft IRS track
On the PFD, speed and altitude have a “trend vector.” that gives a __ forecast.
6 sec
What is needed for In-Flight alignment?
1 GPS
Water tank capacity
30 gal
What is needed for a No-Break Power Transfer
An IDE must be part of the transfer
(An
Using the HMU (hydraulic Motor Generator)
Use other Hydro systems/controls slowly (speed brake - 3 sec to open or close)
When airborne, where does the GSB (ground service Bus) get its power
Right Main DC Bus
What do the TRUs do?
Convert AC power to DC
(there are 5 of them
L ESS
L Main
Aux TRU
R Main
R ESS)
What buses are powered immediately when you put the HMG on?
L and R Standby AC buses
Main Batteries
24 VDC, 53 Amp, NICAD
If you select the L Main TRU where does it get power from?
The R Main AC Bus
What do the GCUs (Generator Control Unit) do?
The monitor volts, freqs, and loads for over and under conditions and faults
How do you Reset the GCU?
Use the associated Gen switch on the overhead panel
What do the BPCUs (Bus Power Control Unit - two of them) do?
Provide electrical power distribution and protection. It will prioritize the Aux TRU - ESS before Main, Left before Right
How to reset the BPCUs?
Reset (AC/DC) button on the overhead panel
What is the battery charger capacity in AMPS if using the AUX TRU?
50 Amps
Battery chargers will not charge the batteries if they are below.
7 VDC
Min Battery Volts for DC Start
22 VDC
Which bus powers the Avionics E-Batts?
L / R Standby AC Buses
If the grounds service bus light is illuminated
The GSB gets power from the Right Main Battery or the External DC power chart.
When do the battery lights come on?
1) When powering an APU START
2) When the Aux Pump is running
3) When powering the L and R ESS DC Bus
How many temperature zones are there in the aircraft?
3 zones. (Cockpit, Forward cabin, aft cabin)
Manual temp mode range
35 F - 230 F
Auto temp mode range
60 F - 90 F
