EICAS, Power, plant APU, Air Conditioning & Pressurization Flashcards
APU;
What is indicated by the illumination of the PUMP FAIL light?
APU fuel pump failed to energize
APU;
What happens when you push the PWR FUEL swichlight
When pressed in: APU fuel pump is energized ECU powers up APU IN BITE status message appears on ED2 APU and RPM gages appear on ED2 The door open on the ground APU shut off valve opens
APU;
What is indicated by the illumination of the SOV FAIL light?
APU fuel shut off valve is not in the commanded position
APU;
What happens when the START/STOP switchlight is pressed in?
In flight the APU door will modulate open as needed
The starter motor is energized
White start light illuminates
At 40-60% RPM the START light extinguishes
At 99% RPM plus 2 seconds the green AVAIL light illuminates
APU;
When the START/STOP switchlight is pressed out what happens
Fuel shut off valve closes
APU shuts down
The green AVAIL light extinguishes
The inlet door closes
What is the primary function of the APU
To provide electrical power
How many VAC does the APU generate
115 VAC
Where is the APU fuel pump and how many volts DC is it
In the left collector tank
28 VDC
What would cause the APU to shut down in flight or on the ground
Overspeed >106%RPM Loss of OVERSPEED protection Loss of speed sensor signals No APU rotation No APU light off Slow start No acceleration Speed fallback APU fire/emergency Loss of air inlet APU door failure Uncommanded door closure ECU internal failure Loss of DC power
Will the APU shut down on the ground due to high oil temp or low oil pressure
Yes
Will the APU shut down in flight due to high oil temp or low oil pressure
No
If the APU shuts down due to fire on the ground will the bottles fire
Yes
At what altitude will the surge control valve open
17000
The APU will not start if the RPM is rotating above what speed on the ground and in flight
5% on ground
12% in flight
If the APU door is open or the door position is unknown with the APU shut down what is the limitations
Flight restricted to 220 KIAS
Why is the APU door restricted to 220 KIAS while shut down
To prevent APU from windmilling without proper lubrication
To insure RPM stays below 12% in the event the APU becomes necessary to start in flight
Is there a way around the 220 KIAS restriction with the APU door open
Yes, normal speed may be used if APU is running
If the APU fuel pump fails will the APU continue running
Yes, but cannot be restarted without the pump
What is the purpose of the load control valve (LCV)
The LCV varies pneumatic load to ensure electrical power and 45psi in the manifold
Can APU bleed air be used for anti-ice
No
What is the minimum battery voltage for the APU
22 volts
What powers the APU door, and what powers the ECU
APU battery provides power to the door and is secondary for the ECU. the main battery is the primary power source for the ECU
If the APU is left unattended can the ground crew shut it down
Yes, APU shut off switch on the forward nose or in the APU compartment
What do the following EICAS display color codes mean:
Red, amber, green and white
Warning, caution, advisory, status
What powers the two EICAS screens
The battery bus
Are the two EICAS cooling fans powered by the battery bus
No
What gathers data for EICAS displays
(DCU) Data Concentrator Unit
How many chimes for CAUTION message at a WARNING message
One chime
Three chimes respectively
Name a few other aural warnings that the DCU’s can generate
Fire bell for fire
warbler for stall
Clacker for an overspeed
Siren for windshear and terrain
Which aural warnings will the DCU audio warning inhibit switch not cancel
Windshear, EGPWS and TCAS
When will the oil pressure gauges be present on the EICAS primary display in addition to the digital readout
With the engines shut down, or with low oil pressure
When will the N1 vibration gauge replace the oil gauges
With the engines running and normal oil pressure
How is N2 vibration monitored
The system monitors N2 vibration independently without display.
If N2 vibration exceeds a predetermined amount, VIB will be displayed inside the N2 gauge
When will the flap gauge disappear
With the wheel brake temps in normal range and the gear, slats and flaps retracted
When will the wheel brake temps indicators disappear
With the wheel brake temps in the normal range, and the hear, slats and flaps retracted
When can you box caution messages and how
Pressing the CAS button with both engines running. New message will appear above the boxed MSG icon
When are caution messages inhibited on take off
Short answer: Thrust lever advancement to 400 feet
Long answer: With the power greater than 79% N1 to 100 KIAS some messages will be inhibited; when the speed is greater than 100 KIAS UP TO 400 feet on the radar altimeter most messages will be inhibited
When are certain caution messages inhibited on landing
400 feet AGL to WOW plus 30 sec. Or when climbing above 400 feet
What happens if ED1 fails
Primary page will display automatically on ED2
If ED1 fails the primary page will revert to ED2 how can the Synoptics page be viewed
Select EICAS on the MFD reversionary panel and use the ECP (EICAS Control Panel) to cycle through synoptic page or select ED2 on the source select panel to un-inhibit the ECP then select the desired Synoptics page
Name several conditions that must be satisfied for the TAKOFF CONFIG OK advisory message to be displayed
Parking brake off Flight spoilers stowed Flaps between 8 and 20 Stabilizer trim inside green takeoff band Rudder trim inside takeoff range Aileron trim inside takeoff range Autopilot off
What does the FADEC do
Controls engine starting, fuel flow, compressor airflow and ignition automatically
Describe the engine fuel system
Fuel is drawn from the collector tanks through motive flow, and supplied to the engine fuel pumps and fuel metering unit (FMU). Metered fuel is then supplied to the fuel injectors where it is sprayed into the engine combustion chamber directed by the FADEC
What happens when pushing the START switchlight
The isolation and start valves open and the Air Turbine Starter (ATS) will engage illuminating the START switchlight and the appropriate L or R START status message on ED2
When will the CONT switchlight illuminate and the igniters fire automatically
FADEC senses a flameout, prior to stick shaker during a stall, or when airflow is disrupted in the engine
What drives the accessory gear box
The N2 Compressor, which is driven by the high pressure turbine
What items are in the accessory gear box
(HOFFAI)
H ydrolic pump O il pump F ADEC alternator F uel pump A ir turbine starter I ntergrated drive generator
What are the three interconnected fuel pumps within the accessory gear box
Low pressure pump
High pressure pump
Motive flow pump
What are the rated thrust outputs of the engines
Normal is 12,670
APR is 13,790
What drives the N1 fan
Low pressure turbine
How many stages is the low pressure turbine
Four
What comprises an engine stage
A set of staters and rotors.
How much thrust is provided by the N1 fan
80%
What powers the variable geometry vanes (VG)
Fuel pressure directed by the FADEC
What is the operability valve
The operability valve works in conjunction with the VG vanes to remove internal air pressure from the compressor section of the engine reducing the risk of a compressor stall
What powers the operability valve
Fuel pressure directed by the FADEC
How is fuel heated prior to combustion
Fuel/oil heat exchanger
How many channels does the FADEC have and when do they change channels
Two handles A and B, channels change when N2 RPM falls below 7% on EVERY engine shutdown
How many FADEC channels are in use at once
One channel commands the engine while the other channel monitors the controlling channel and is in standby in case the commanding channel fails
Is there a time both FADEC channels will command the engine simultaneously
In an engine OVERSPEED situation both channels will command the fuel valves to close to bring the speed into normal range
What happens if both FADEC channels fail or FADEC loses power
The engine will fail
Can the left engine FADEC control the right engine
No
Do the left and right engine FADEC cross talk with each other
Yes, they compare engine speed and thrust reverser position information
While cross talking, when will one engine’s FADEC assume the other engine’s FADEC has failed
Difference of 15% N1
When an engine fails, what will the operative engine’s FADEC automatically command
APR in the TOGA detent, MCT in the climb detent, and a power increase in the cruise range
What will the FADEC command if a thrust reverser deploys in flight
It will reduce that engines thrust to idle
At what speed does the FADEC lock in the final N1computation during takeoff
65 KIAS
What powers the FADEC
Aircraft electrical power with an N2 of less 50% and the FADEC alternator with N2 of greater than 50%
When will the L or R OOL LEVEL LO status message
appear
Below 57% with the engine running and below 80% with the engine stopped
What must the pilot verify on takeoff using FLEX takeoff
Computed thrust display on primary display is equal or greater than that required in the QRH
What powers the igniters
Igniter A is powered by the AC essential bus and igniter B is powered by the aircrafts battery and an inverter
Max altitude for engine relight
FL210
What are the five different engine idles
Flight idle Approach idle Landing idle Reverse idle Ground idle
When is APR armed on takeoff
Within 8% of target thrust
What does the blue circle indicate on the N1 gauge during cruise flight
Max thrust setting for cruise
How is the aft cargo bay receive conditioned air
Mixing manifold by recirculating fan and supplemental heat is provided by an electrical heater
Bleed valve rotary selector:
AUTO
CLSD
MANUAL
AUTO-The ACSC’s automatically control all bleed air
CLSD-Closes bleed air from the engine PRSOV’s and APU
MANUAL-Enables the ISOL switch and BLEED SOURCE rotary selector for manual operation
BLEED AIR panel;
ISOL switch
Divides or connects the left and right pneumatic systems
What happens when the L or R PACK switchlight pushed out
The pack flow control valve closes and the white OFF light illuminates
What happens when L or R PACK switchlight is pushed in
The pack flow valve opens and the white OFF light extinguishes
AIR-CONDITIONING
What does the amber FAULT light mean
Pack has failed in both auto and manual mode due to an over temp or over pressure condition
AIR-CONDITIONING
RAM-AIR guarded switchlight what happens when pushed in.
The ram air valve will open and the white OPEN light illuminates along with the white status message on ED2
AIR-CONDITIONING; CARGO switch explain all three positions OFF AIR COND AIR
OFF- Ventilation to the aft cargo bay is shut off
AIR-The intake and exhaust valves open and conditioned air is provided to the aft cargo bay from the mixing manifold
COND AIR-Supplemental electrical heater is armed for automatic operations
How is the bleed air from both engines kept separate
Isolation valve
What does the cabin pressure controller do
Independently acquires and monitors cabin pressure, outside air pressure, differential pressure and rate of change information also commands the outflow valve to move based on information
What does the CPAM do ( Cabin Pressure Acquisition Module)
First it acquires cabin pressure and rate of change information displayed on ED2. In the event of CPC failure it will let you know how to operate the outflow valve. Second it will command the passenger oxygen mask to deploy and the seat belt no smoking signs to illuminate if cabin altitude exceeds 14,000 feet
During automatic mode when the CPC’s are in control, how many operational phases are there
Seven
Name the CPC’s operational phases (Cabin pressure controllers)
Ground Takeoff Flight abort Climb/cruise Descent Landing Touch and go
What does the flight abort phase do
It will assume dept elevation is landing elevation until airplane climbs through 6000 feet or ten mins pass
Will the cabin fully depressurization while flying 41000 feet
No, up 14,500 feet plus or minus 500 feet
What does the ground valve do
Insures depressurization on the ground and increases air flow to avionics
When does the ground valve close and open
Cabin door closes and when WOW
What does the OVBD COOL FAIL status message
Ground valve did not open on landing
Which pack cools the cockpit, cabin
Left pack cools cockpit and right cools cabin
What protects the airplane from over pressure or negative pressure situation
Two safety valves one for over pressure and one for negative pressure
When does the bleed air switch from The APU to the engine after takeoff
TOGA detent with gear up and flaps 20 or less
When does bleed air switch from engine to APU on approach
Gear extended or flaps 20 or greater with thrust levers out of TOGA
Is the external ground air connector displayed on ECS page
No, however a digital air pressure readout will indicate air is being provided
What emergency requires the RAM-AIR switchlight to be pressed
Emergency ventilation of the cabin is required
Where does ram air come from
A scoop at the base of the vertical stabilizer
When does the CABIN PRESSURE aural warning sound
Cabin altitude exceeds 10000 feet or pressure differential exceeds 8.7 psi
What is the water extracted from the packs used for
It is sprayed across the pack heat exchangers in the ram air duct
Which hydronic systems are cooled by the ram air
System 1 and 2
What does the amber CAUTION ALT caution message indicate
Cabin altitude is between 8500-10000 feet
What is the function of the pressure regulating shutoff valve (PRSOV)
Modulates as commanded by the air conditioning system controller to maintain approx 45 psi in the bleed air manifold
Briefly describe the Air Cycle Machine(ACM)
Cycles hot air into cold by compression then expansion
Hat is the function of the packs hot air shut off valve
Opens at high altitudes to supply pre-cooled air to the pack’s flow control valve
Describe the flow of air through the pack compartment
Precooler Heat exchanger Compressor Heat exchanger Reheater Condenser Water extractor Turbine
