APU
What is the APU EGT limitation?
260-680 degrees Celsius normal (maximum continuous), 710 Maximum.
What power do generators provide? How are they cooled?
115v, 400Hz, 3-phase AC.
Engine generator - oil cooled
APU generator - air cooled
What is the bleed air pressure from the APU?
40 - 50 PSI
525F (+-25)
What valve keeps air pressure inside the aircraft or relieves aircraft internal pressure. Normally automatic but can be controlled manually.
Outflow valve.
What are the abilities of the Communication Navigation Braker Panel?
Tune radios, input navigational aids, pull and reset electronic circuit breakers.
1 minute on and 4 minutes off. No limit to the number of duty cycles.
What buses does the APU power when it is the only generator online? What does it power regardless of the on/offline condition of another generator?
Essential AC bus and Main AC bus.
Always powers the Essential AC bus.
What stages of the compressor supplies bleed air to the aircraft?
10th and 14th
What is the operation cycle of the vertical de-icing boot?
6 seconds on, 54 seconds off
What are the five modes for pressurization mode select switch?
Constant Alt, Man, Auto, No press, Aux vent.
How many radios are on the aircraft?
Seven.
How much does the APU door open on the ground, in the air, and in emergency start?
35 degrees on the ground, 15 in the air, 15 in emergency.
What component monitors each generator and allows generator power to be applied to the aircraft? How are these components turned off/reset?
Generator control units.
Engine gen - engine generator switches to OFF/RESET
APU gen - Ext/APU switch to OFF
What controls and monitors the various bleed air components and sensors throughout the aircraft?(Nacelle shutoff valves, pressure sensors, temp sensors, etc...)
Bleed air and environmental control system (BAECS)
6 minutes.
Minimum of two cycles.
What valve helps prevent is build up on the water separator/water sock on the AC pacs? And what PSID does the AC pac shutoff because of the excessive ice buildup in the water separator?
Anti-ice valve.
14 PSID.
What two systems make up an EGI?
Global Positioning System and Inertial Navigation System.
Where does the APU receive its fuel from and what do you need to do when that fuel level drops below 2,000 lbs?
#2 main tank. Turn on #2 tank boost pump (can you tell me why)
What component converts 115V, 400Hz, 3 phase AC to 28V DC? How many are there? (LAIRCM installed)
Transformer rectifier units.
Five.
Where are the pressure sensors located that sense bleed air manifold pressure? Which side gives you indication?
On each side of the divider valve.
LH sensor gives you indication.
How many engines need to be high sped to conduct the wing/emp ice protection test?
Three
When does the safety valve open to relieve excessive positive differential pressure and negative differential pressure?
Positive - 14.96 in
Negative - .76 in
What component eliminates the need for the crew to continuously monitor the HF radios?
SELCAL
What is the APU operating altitudes?
-1,000 to 20,000 feet
What component converts 28V DC to single phase 115V AC and 26V AC? How many are there?
Inverter
Two
Fire/Overheat Detection System controller.
How long is the engine anti-ice test and how long is the wing/emp ice protection test?
Wing/emp - 90 seconds
For pressurizing and depressurizing the plane, what is the normal climb rate and decent rate? What is the minimum and maximum cabin rate?
Climb - 500 fpm
Decent - 300 fpm
Min - 0 fpm
Max - 3,000 fpm
This system provides automatic identification of the aircraft when interrogated by surface or airborne radar sets using correctly coded pulse transmissions.
Identification friend or foe transponder (IFF).
If the APU does not shut down immediately after the APU control switch is placed to stop, how long after will the APU automatically shut down? What component has failed?
5 seconds.
Electronic three speed switch. Specifically, the 110 percent overspeed switch.
Name all the electrical buses.
DC - Essential, Main, Isolated, Avionics, Utility battery bus, Avionics battery bus.
Ext credit - SME DC bus
The BAECS sends a signal to what component to open and close the augmenter valve?
Pnuematic controller.
What is the key difference between Deice mode and Anti-ice mode? When do you use anti-ice mode?
The vertical tail zone anti ice valves remain open continuously.
Approach and landing
Describe the different pressurization modes.
Instructor will read the individual's answers and determine if they are correct.
VOR/ILS/MB, TACAN, UHF direction finder, Automatic direction finder (ADF), are all examples of what?
Navigational aids. NAVAIDS