Systems/Oral Questions Flashcards
What are the ac generators rated at
115/200 VAC 400 HZ APU
115/200 VAC 404-577 HZ ENG
What type of battery and voltage
Ni-Cad, 24 volt 27 amp hour
What do the inverters power
GPWS, FDR, CVR,
If you lose the L TRU what do you lose
Left utility bus
What happens in the DC system if a single AC gen
nothing, dc system can be supplied completely by one gen
“Batt mode only”
Loss of all TRU’s, only the batteries are powering the airplane
What powers the emergency lights
28 VDC emergency bus, if that’s also offline its powered by 3 batteries and will last for 10 min
What triggers the emergency lights to come on
Loss of the left main bus
What temp will the CRT’s be lost
110C you get a waring 115C they shutdown
When do the fuel boost pumps come on automatically
Condition lever moved to start, LH pump can be activated by the APU being started with the left engine not running, opposite engine running with crossed open.
Will losing the boost pump cause the engine to shutdown
No, the FPMU is capable of supplying the engine with sufficient fuel supply
What closes the firewall fuel valve
Condition lever to off or pulling the T handle
APU auto shut down in the air (3)
-Overspeed (108%)
-ESU Failure (electronic sequence unit)
-Failure of the speed signal
Auto Shutdown on the ground (8)
-ESU failure (electronic sequence unit)
-Loss of the speed signal
-APU fire
-Overspeed (108%)
-Over temp (712 degrees C)
-Low oil pressure
High oil temp
APU Autostart in flight
-Loss of an engine
-Powerloss -56%
Autostart on the ground (APU)
-Faulty WOW switch
-Landing gear circuit breakers being pulled
-Jacking the airplane
What type of engine is in the Saab
AE2100A
Shaft horsepower in MTOP and NTOP
MTOP: 4152
NTOP: 3738
What is APR
Automatic Power Reserve (APR), when armed will automatically increase the engine power output by approximately 11%
What is on the PMAD
FLAP
Powerplant mounted accessory drive (PMAD)
Fuel Pump Metering Unit
Lubrication pump
Air turbine starter
PMA (Permanent Magnet Alternator)
What’s on the GMAD
PEAPP
Prop high press oil pump/ovr speed
Engine driven hydraulic pump
AC Gen
PGB oil pump
PCU:(pitch control unit) non moving
Three parts of the engine
Power unit
Torque meter
PGB
Ignition System
Two igniters
PMA: powers FADEC and Exciter
Auto Relight
Shuts off engine if no light off in 8 sec
NG<56% no auto relight
Low Fuel temp
Comes on at <4 degrees at the engine
What powers FADEC
Primarily PMA, secondary 28 VDC
What does FADEC control
Fuel flow
Pitch of prop
Auto relight
ITT limiting
Overspeed protection (shutdown at 110 NG/111 NP
Communicates with opposite engine
Only one FADEC being used (A/B system)
How many FADECs
One system per engine, system has two separate boxes, dual channel
Override Switch for FADEC does what
“dumbs it down” only looks at fuel flow and NG. You would use this function if you were getting erratic uncommanded power changes
Palm Switches do what (5)
-GA/GA
-Sequences missed approach
-7-8 nose up
-Initiates TOGA (PWR mode)
-disconnects autopilot
In TOGA what probe does FADEC get temp from? Normally?
Normally TAT, in TOGA T2
Manually switching FADEC channel causes what
6% power change for 5 seconds
Autofeather
Commanded by FADEC:
-Engine speed sensor at low power
-Engine torque at high power
Tells other engine not to feather
-sends APR signal to operating engine (if apr is on)
What are the two methods of defueling
With boost pumps and suction
Just suction
At what cabin altitude do the masks auto drop
13,500
What type of hydro fluid
5606
How long can you run the landing lights without the engines running on the ground
30 seconds
How long must you leave power to the system after IRS power down to ensure they receive adequate position information
10 seconds
How much oxygen must be on board for two crew and or 3 crew
-2 is 1050
-3 is 1450
How many AOA’s to activate shaker/pusher
Shaker: 1 AOA
Pusher: 2 AOA
Tailstrike will occur at approx what nose up attitude
10 degrees nose up
Wheel sweep in turn (min pavement width
83 feet
At 31,000 feet and max dp what is the approximate cabin alt
7500 feet
Normal DP
7
How long do the Flight data recorder and voice recorders record
Flight: 25 Hours
Voice: 30 min
Prop Ground Clearance
18 inches
What are the two levels of overspeed
Overspeed: 1144 (riding the gov)
H Overspeed: 1166
What triggers the emergency lights, how are they powered, and what charges them
Emergency lights are triggered by loss of the L main DC bus, they are powered by the emergency bus (if powered) or their own batt packs. The batt packs are charged by the emergency bus.
What are some hot battery bus items
-Flight deck dome lights
-Clocks 1/2
-T handle items
-Fueling pannel
-External power control
-Extinguishing L/R shots 1/2 (squibs)
-Cargo extinguishing
-APU extinguishing
-ELT transmit indicator
-EICAS L/R DCU STBY power
-Potable water control/indication
-ACARS
-Emergency Pitch Trim
-APU starting motor
-Stair lights
-Cabin lights
-Cargo/service comp lights
What are the users of the hydraulic system
Brakes, Flaps, Nose wheel steering, Gear, Elevator, Rudder, Emergency Pitch trim
How many accumulators in the hydro system
5 total: 2 on the left, 3 on the right
What’s on the left hydro system
Outboard brakes, Emergency gear extension, left outboard elevator, right inboard elevator, Left rudder (actuator 1)
What’s on the right hydro system
Flaps, Inboard brakes, nose wheel steering, nose gear, mains, right elevator outboard, right rudder (2)
What’s the only user of the center system
Left inboard elevator
What’s a velocity fuse/SOV
Activated by a massive or rapid fluid loss, the valve closes trying to prevent total loss of fluid
If the Left SOV (velocity fuse) closed what would you lose
Potentially the emergency gear extension and outboard brakes (if the accumulator was loosing pressure
If the Right SOV (velocity fuse) closed what would you lose
Nose gear extension/ retractions, Nose wheel steering, Inboard brakes (potentially), and the flaps.
Tell me about the C/R Hydro Pump
DC powered, one motor driving two pumps Integrated hydraulic package (IHP), one pump runs the center system one pump on standby to support the right system
What kind of flaps
single slotted
What’s the blowback feature of the flaps
In an overspeed condition the flaps automatically retract to a safe setting
(Uses pressure sensor)
What is AFR
Auto flap retract (AFR) automatically retracts the flaps to 15 to help get the weight on the tires and reduce ground roll. They retract at 2x the normal rate signaled by antiskid reaching 25 kts wheel speed
What are the 5 PECU input modifications (feelings)
-Stick to gearing vs KIAS: reduces elevator travel with increase in speed
-Downspring: Elevator down command for a speed decrease and an up command for speed increase
-Bob weight: Increased stick force with increased g load
-Trim weight vs KIAS
-Flap Movement
What are the required conditions for PBIT
-<40 KIAS (if over defaults to CBIT)
-L/R gen online
-Weight on wheels
Where are the TRU’s located
Left and center are on the left side, right is on the right side
How is Wild ac converted to dc
TRUs
Battery low level waring
<16 volts
How is the landing gear retracted/extended if the right SOV is activated
The nose gear cannot be extended or retracted under this condition (emergency extension). The mains are retracted/ extended normally by a signal from the landing gear selector telling a transfer valve to open allowing normal extension and retraction of mains only
How many full brake actuations are provided by the brake accumulator
6
When will the white gear arrows change to amber
takes longer than 20 seconds for the gears to reach up and locked
What is the purpose of the nose wheel brake
nose steering brake is activated by an uncomanded deflection of the nose wheel and limits it to 20 degrees
How does antiskid work
Compares wheel speeds within the pairs, if it detects slipping it will release the brakes on the skidding tire and its counterpart (left outboard, right outboard) its inoperative below 10 kts and active at 50 kts wheel speed in 3 seconds
What supplies pax oxygen
oxygen generators (chemical reaction). pulling down the hose activates the flow, and will run for approx 30 min.
