Oral Study Questions Flashcards
When doing the walk around what is the pressure gauge under the right wing displaying?
The gauge under the right wing is showing accumulator pressure. This is maintained by nitrogen gas keeping pressure within the system. This is not the same pressure as what is shown in the cockpit as the accumulator can lose its pressure (bleed out) while the parking brake maintains what is indicated in the cockpit.
If the pressure gauge under the wing does not meet the 500/1000psi requirements MX must be called to recharge the system.
How do you check the parking brake pressure?
The only accurate indication is located on the FO’s MFD.
When doing the walk around you notice the gauge under the right is below 500psi. Can you charge the system by using the manual pump located in the #2 nacelle?
No. The gauge under the wing is only showing the pressure in the accumulator which is maintained by a nitrogen charge. If the pressure is low MX must be called to recharge the system (add nitrogen).
Describe the batteries of the aircraft
Three 24v 40amp/hr batteries. You have your main, aux, and standby.
When I flip the battery master switch on what does it do?
It directly connects all three batteries to the Essential DC buses
What happens when I select the main, aux, and standby switches on?
The main connects the main battery to the right main bus.
The aux connects the aux battery to the left main bus.
The standby connects the standby battery to the left main bus allowing a “one-way” power flow for battery recharging only.
When you go to start an engine what batteries are providing power?
The main and aux batteries assist with engine starts. The standby battery provides DC power to the HOT battery bus.
When looking in the nose compartments which batteries are which?
The main and aux batteries are located on the bottom. The forward battery is the main with the aux behind it.
The standby is located on the top.
Describe the generators on the aircraft
There’s five located on the aircraft. Each engine has a DC and AC gen. The APU has a DC gen. Each generator is capable of supplying 400amps of output.
How are the DC and AC gens cooled?
The DC gens are air cooled. The AC gens are oil cooled.
Describe how the DC gens work
The engine driven DC gens are driven by the accessory gearbox and monitored by the generator control unit (GCU). They act as starter-generators. During engine start when Nh reaches 50% the GCU converts from the starting to the generating mode. They then supply power to their associated main DC bus.
How do the AC gens work?
The AC generators provide 115v AC power to the aircraft through the left and right variable AC buses. The AC generators come online once the engines are operating over 440rpms.
What do the AC gens power?
The AC gens provide power to the de-ice/anti-ice systems (except pitot static tube #3), your standby hydraulic pump (hyd sys 1), your two TRUs, both of your aux fuel pumps, and your galley loads.
Can your AC system provide support for an engine start?
AC power will not support engine starts.
How many TRUs are there and what they?
There are two TRUs on the aircraft. They convert AC to DC power. The TRUs can output 300 amps each and will allow the AC gens to power the DC systems in the event of failures.
Describe the fuel tanks on this aircraft
There are two tanks and each has three sections. The surge bay, main tank, and collector bay.
The surge bay is used for tank venting through two NCAA vents. One vent allows for fuel overflow while the other provides positive pressure within the tank. Any fuel that flows into the surge bay in flight is siphoned back into the main tanks.
The main tank simply stores the bulk of the fuel and delivers that fuel to the collector bay.
The collector bay provides a steady supply of fuel to the engines.
How much fuel does each tank hold?
5862 lbs of fuel per tank.
When will you get a “tank fuel low” light?
When the level of fuel drops below 305lbs
What’s the temp limitations for the fuel gauge?
0 to 71 degrees C
What pumps provide fuel to the engines?
Your primary pumps are your engine driven fuel pumps with AC powered auxiliary pumps.
Which tank does the APU pull from?
The left tank
If your fuel is imbalanced can you cross feed your engines to burn fuel from the other tank?
No. Cross feeding engines isn’t possibly you can only transfer fuel from tank to tank.
How many fire loops does each engine have?
There’s three. The PEZ, LEZ, and MWW
( Primary edge zone, Leading edge zone, and Main Wheel Well)
PEZ–>LEZ–>MWW
What does it mean when you get a Fault A indication?
That either the PEZ or LEZ loop has failed.
What does it tell you if you receive both FAULT A and fire indications?
That you still have a fire. The PEZ loop runs through the LEZ loop so it’s possible to have a fault in the PEZ and the LEZ still detect a fire.
PEZ–>LEZ–>MWW
What does a FAULT B indication mean?
That there’s a failure in the MWW loop.
Is it possible to have a fire with a FAULT A indication and not receive a fire indication?
Yes. If there is a FAULT A then we know there is a fault in the LEZ or PEZ loops. Since the PEZ loop connects through the LEZ loop it’s possible for there to be a fire in the PEZ and due to the LEZ having failed you’d receive no fire indications.
Pez–>LEZ–>MWW
Does the APU have fire detection?
Yes, it has it’s own fire detection loop. If a fire is detected the APU will shut down and the fire extinguishing agent will be released after 7 seconds.
If there’s a failure in the APU’s loop it will be indicated in the cockpit by the simultaneous illumination of the Master Warning, Check Fire Detect, and the Fault advisory light (Amber) on the APU section of the fire protection panel.
How many fire bottles does this plane have?
There are seven.
Two in the left wing root for the engines.
Two in the aft baggage (fast and slow rate)
One in the forward baggage.
One for the APU.
One in the lav.
What happens if I press the fire extinguishing switch for the forward baggage compartment?
The forward compartment has it’s own fast rate discharge and shares the slow rate bottle from the aft compartment. When you press the fire ext switch both bottles discharge at the same time however the aft slow charge takes approx 7minutes to reach the front after which continuous suppression is provided for approx 45 min.
When doing the engine test what am I checking for?
The 3-1-3 rule for lights
3 on the overhead-Pull fuel/hyd, Fault A, Fault B
1 on the CWP-Check Fire Detect
3 on the glareshield-Master Warning on Capt side, Engine fire on each side.
All fires also have an aural warning tone associated with them.
When doing the APU fire test what am I looking for?
5-1-2-2 rule for lights
5 on the overhead panel-APU FUEL CLOSED, BTL ARM, EXT, FIRE, FAULT
1 on the APU control-FAIL
2 on the CWP-APU, CHECK FIRE DET
2 on the glareshield-Master Warning, Master Caut.
All fires also have an aural warning tone associated with them.
What am I looking for when I perform the FWD baggage test?
2-1-1 rule for the lights
2 on overhead panel-SMOKE/EXTG, FIRE BOTTLE
1 on the CWP-SMOKE
1 on the glareshield-Master Warning
All fires also have an aural warning tone associated with them.
When I perform the aft baggage test what am I looking for?
4-1-1 rule for the lights
4 on overhead panel-SMOKE/EXT, FIRE BOTTLE, VENT INTL CLSD, VENT OUTLET CLSD
1 on the CWP-SMOKE
1 on the glareshield-Master Warning
All fires have an aural warning tone associated with them
What causes the APU to automatically shutdown?
Over speed Under speed Start failure Over temp High oil pressure Low oil pressure Failed sensors Internal failure
What’s on the #1 hydraulic system?
Flaps Inboard spoilers Brakes Rudder (lower pcu) Anti-skid PTU Elevator (outboard pcu)
What’s on the #2 hydraulic system?
Landing gear Outboard spoiler Nose wheel steering Emergency Brake Rudder (upper pcu) Elevator (center pcu)
How many hydraulic systems does this aircraft have and what are their quantities? How much is required for dispatch?
There are four hydraulic systems. Their quantities are 8, 12, 2.6, and 1.2 quarts respectively. A minimum of 40% is required for dispatch.
What does the #3 hydraulic system do?
Provides hydraulic power to the #3 pcu (innermost) for the left and right elevators.
What does the #4 hydraulic system do?
The #4 system is used to manually extend the main gear. There is no quantity indication in the cockpit.
What are the backups to power the #1 and 2 system? When are they activated?
The #1 system has an electric AC backup pump. The #2 system has a PTU. The PTU is a pump connected to the #1 system so when needed the #1 system’s fluid can be used to turn the PTU thus creating pressure in the #2 system.
They are activated anytime the respective side has an engine failure, when the flaps are selected to a position greater than zero (with the brake off), or when selected on the control panel.
If pressure starts dropping on the #1 system what happens?
If losing pressure (below 2100psi) the priority valve will close shutting off hydraulic power to the flaps and PTU.
What happens if you lose hydraulic fluid in the #1 system?
If loss of hydraulic fluid detected in the system the HYD ISO valve will close. This will only allow fluid to the PTU, Rudder, Elevators, and Flaps.
(Pref)
You’d PREFer not to lose fluid.
Does the #2 system have a priority valve? What happens if it loses fluid?
The #2 system does not have a priority valve. If pressure starts dropping the PTU will be powered by the #1 system to increase system pressure (manually activated).
If the #2 system loses fluid the hyd ISO valve closes so that fluid is preserved for the Rudder and elevator.
Will the #3 hydraulic system automatically activate? What happens if it’s activated while the #1/2 systems are operating normally?
The #3 hydraulic system will automatically activate when a failure is detected in the #1/2 system to supply hyd pressure to the left and right ailerons through the #3 PCU.
If the #3 system is activated with the #1/2 systems operating you will receive the ELEVATOR PRESS caution light on the CWP.
What happens when you open the alternate gear door above the FO’s seat?
When the door is opened the landing gear is no longer being powered by the #2 hyd system. Moving the gear selector will no cause the main gear to move.
