Download AWAC CL-65 Recurrent Study Guide: Aircraft Electrical Systems and more Exams Aviation in PDF only on Docsity!
AWAC CL-65 Recurrent Study Guide 100% Verified!!
What are the sources of AC electrical power for the CL-65 - ANSWER 2 IDG's, APU generator, ADG (Air driven generator), External AC power.
What is the normal frequency, phase, and voltage of AC power? - ANSWER 115 volts, 400 Hz, 3 phase
What components make up the IDG? - ANSWER Constant speed drive and a generator
At what RPM does the constant speed drive rotate? - ANSWER 12,000 RPM
What is the load limitation of the IDG's? Altitudes? - ANSWER 0 - FL350 = 30 KVA
FL350+ = 25 KVA
What is the load limit on the APU GEN? To what Alt? - ANSWER 30 KVA to FL
What is the normal source of power for AC BUS 1? - ANSWER GEN 1
If GEN 1 fails, what sources of power does AC BUS 1 look for, in order? - ANSWER APU GEN, GEN 2, External AC power.
(On-side, APU, Off-side, External)
What is the normal source of power for AC ESS BUSS? - ANSWER AC BUS 1
When will the AC ESS XFER light illuminate? - ANSWER When AC ESS BUS is not powered by AC BUS 1
What does a FAULT light symbolize on an IDG disconnect push switch? - ANSWER HOT LOP
High oil temp (>160*), Low oil pressure
When will the IDG DISC push button illuminate DISC in white? - ANSWER When the IDG has been manually disconnected, over temp (>179*), or over torque (> 3,300 lbs of force)
If an IDG is diconnected can it be reconnected in flight? - ANSWER No - its a MX function.
(There is a reset ring that has to be put into position on the IDG)
What would cause the AC BUS 1 AUTOXFER push button to illuminate yellow FAIL? ANSWER A short on AC BUS 1 that creates an over current situation on the generator. This causes the AC bus 1 switching logic to fail allowing the shorted bus to not be powered by the other generators and for them not to be taken offline as well as preventing a possible electrical fire.
If the following electrical caution messages appear on ED 1, AC 1 AUTOXFER, GEN 1 OFF, AC BUS 1, which QRH should be called for? - ANSWER AC 1 AUTOXFER - It is the only QRH that infers that the bus has shorted and needs to remain off. The first step of the other two QRH's is to turn GEN 1 to OFF RESET and back on which will repower the shorted bus.
When would an AUTOXFER push button be selected to OFF? - ANSWER If the associated AC bus is suspected to be the source of smoke when running the SMOKE / FUMES REMOVAL QRH.
If AC BUS 1 shorts and AC 1 AUTOXFER failure, which lights will light on the electrical power services panel? - ANSWER AC 1 AUTOXFER FAIL (AMBER), AC ESS ALTN (WHITE), TIE 1 CLOSED (WHITE)
Speed limit if flying Wet style ADG? - ANSWER Below 250 KIAS - None
250- 330 KIAS -12 min
331 -335 KIAS -4 min
During what conditions, if any do the AC UTILITY buses load shed?-ANSWER Single generator ops in flight or on the g/d with the main passenger foor closed and the flaps greater than 0 degrees.
What does the AC ESS XFER ALTN push button do? - ANSWER Shuts off AC BUS 1 from powering AC ESS BUSS if a generator is brought back online.
What does the power transfer override switch do? - ANSWER Shuts off ADG from powering AC ESS BUS if a generator is brought back online.
How long will the aircraft remain powered in flight on battery power only? - ANSWER 30 min
What are the sources of DC electrical power on the aircraft? - ANSWER 5 TRU's, APU battery, Main bettery, DC external power.
What are the limitations of the TRUs? - ANSWER 100 Amps each.
What are the nominal voltages of the DC electrical system? - ANSWER 28 volts generated by the TRUs and 24 volts stored in the battery.
If DC external power is connected, what buses are power? - ANSWER APU BATT DIR BUS and MAIN BATT DIR BUS.
What does the battery master switch on do? - ANSWER Ties the APU BATT DIR bus and the MAIN BATT DIR buss together to power the DC BATTERY BUS
What are the DC EMER BUS power sources? - ANSWER APU BATT DIR BUS and the DC BATTERY BUS
What will load shed a DC Utility bus? - ANSWER The closing of the associated tie.
Are the DC ties automatic or manual? - ANSWER TIE 1 and 2 are both, ESS TIE is manual only.
When the ties are closed what is now powering the failed TRUs bus? - ANSWER The SERV TRU
How many amps are stored in the batteries? - ANSWER APU - 43 amps
Main - 17 amp
What is the function of the fire warn test? - ANSWER Tests for continuity in the loops. If there is a break in a loop a fire warning message will not be generated.
What does indicate a test failed? - ANSWER Fire warn message does not appear or the system generates a fire fail message.
What kind of warning messages does the FMS generates in case of the fire warn test? - ANSWER APU FIRE
L ENG FIRE
R ENG FIRE
L JETPIPE OVHT
R JETPIPE OVHT
After 10 second during the fire warn test what caution messages appear, 4 or 5? - ANSWER HYD SOV 1 OPEN
What happens when an engine fire push switch is selected? - ANSWER BA - Bleed Air SOV closes
F - Fuel SOV closes
I - IDG trips offline
S - Squibs are armed
H - Hydraulic SOV closes
(continuous ignition for the engine is inhibited)
If both engine fire push switches are selected and a bottle is discharged, where does the halon go? - ANSWER To both engine nacelles
If an engine fire push switch is deselected will all of the actions performed by selecting the engine fire push switch be reversed? - ANSWER All of the SOVs will be reopened, continuous ignition will function again, the squibs will no longer be armed, but the generators will not come back online. The generator must be turned to OFF / RESET and back on.
How long will the slow discharge bottle in the cargo discharge halon for? - ANSWER 45 min
Why do we select select both the normal and standby cargo smoke push switches and discharge both sets of squibs in the event of a SMOKE CARGO warning? - ANSWER For redundancy purposes and to ensure reliable discharge of the bottles. We don't see a cargo bottle lo message until the slow release bottle has mostly discharged. That takes about 20 min.
How do you verify that the cargo bottle squibs have fired after activated? - ANSWER Operating the cargo bottle test. Test 1 will illuminate a CARGO SQUIB 1 advisory message if both normal squibs have not fired and test 2 will illuminate CARGO SQUIB 2 advisory if the standby squibs have not fired.
What happens automatically if smoke is detected in the cargo bin? - ANSWER The
cargo bin intake SOV closes, Exhaust SOV closes. cargo fan shuts off, SMOKE cargowarning message, aural SMOKE message, master warning flash, CARGO FIREX NORMAL and STANDBY CARGO SMOKE PUSH switches illuminate.
What composes the main landing gear bay overheat detection work? - ANSWER A dual channel single loop installation in each main landing gear wheel well.
How does the lavatory fire extinguisher work? - ANSWER A temperature sensitive plug in the extinguisher allows the extinguisher to discharge halon 1211 when a fire is present. (The tip melts)
Why does the battery master have to be left on when leaving the aircraft unattended with the APU running? - ANSWER The fire detection loops are powered be the left battery bus. If a fire is detected in the APU it will automatically shutdown. If the battery master is turned off nothing will tell the APU bottle squibs to fire.
Where are the engine fuel feed SOVs located? - ANSWER On top of the center tank
When we move the thrust lever to shut off, does it close the same SOV as selecting the engine fire push switch? - ANSWER No, the engine fire push switch closes the fuel feed SOV on top of the center tank and the thrust lever closes the SOV on the fuel control unit (FCU)
What happens when the EMER DEPRESS is selected? - ANSWER If below 14,250' the cabin fully depressurizes. Above 14,250' cabin altitude maintained at 14,250' +/- 750' by altitude limiters (CPAM)
What does an illuminated pack FAULT light on the air conditioning panel indicate? - ANSWER High temp (85* or greater)
High oressure (>51 PSI)
If a L PACK HI PRESS caution message is displayed on ED 1 and the pack is automatically shutdown, will the pack automatically restart once the pressure has been
At what altitude will the pax oxygen masks deploy? - ANSWER 14,000' cabin alt
What is the max pressure differential in flight? - ANSWER 8.7 PSID
What is the max negative pressure differential in flight? - ANSWER -0.5 PSID
What is the max pressure differential during taxi, takeoff, and landing? - ANSWER 0. PSID
What occurs during flight abort mode for pressurization control? - ANSWER If an altitude of 6,000' or less is maintained after departure for less then 10 minutes and a descent is initiated at 1,000 FPM or greater the landing field elevation from the departure airport will be entered automatically
What is the max single pack altitude? - ANSWER FL
What is normal pack pressure? - ANSWER 30PSI
Single pack pressure? - ANSWER 41PSI
When does the cargo fan automatically shut off? - ANSWER Fan exceeds a temperature of 35*C or smoke is detected by either smoke detector in the cargo bin.
What happens automatically if smoke is detected in the cargo bin? - ANSWER Intake and exhaust SOV close, and the fan shuts off.
Where does the cargo bin get its source of air? - ANSWER Recirculated cabin air.
How many fans are installed on the aircraft for display cooling? - ANSWER 3 (fan 1, fan 2, standby)
When do the fans automatically switch over? - ANSWER WOW
What does selecting FLT ALTN for the display fan on the lower pedestal do? - ANSWER Allows continued operation of fan 2 after WOW
When must the RAM AIR valve be selected open? - ANSWER T/O and landing with wing or cowl selected on and APU INOP
What is accomplished by opening the RAM AIR valve? - ANSWER Supplies the left supply system with RAM AIR in flight for flight deck cooling and limited air to the cabin through to distribution manifold.
