2025 05 ACTS: APU / Engines Flashcards
(19 cards)
Engine panel:
What are the primary differences between an automatic and manual start
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Automatic Start
The FADEC provides:
* full monitoring during start
* In the event of a start fault will provide appropriate ECAM cautions and procedures.
Manual Start:
The FADEC makes a pssive survey of the engine during the start sequence and the flight crew is made aware of an abnormal start by an ECAM warning. The FADEC does not have the authority to abort the start, the flight crew must accomplish. (except if EGT limit is exceeded prior to 50% N2 on the ground)
Manual Start items not available:
* Automatic start interruption
* auto-crank
Engine:
When would you use a manual start?
FCOM-PRO-SUP-ENG
- When starting a cold engine after being shut down 4 hours or more and OAT<10*.
- After aborting a start because of:
- Engine stall
- Engine EGT overlimit
- Low start air pressure
- When expecting a start abort because of:
- Degraded bleed performance due to hot conditions or at high altitude airports
- An engine with a reduced EGT margin in hot conditions or at high altitude airports
- Marginal performance of the external pneumatic power group
Engine/thrust levers:
What controls the engines in all operating regimes?
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FADECs
Engine/thrust levers:
What functions does the FADEC control?
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- Start sequencing
- Fuel metering
- Engine limits based on thrust lever angle
- Provides engine indications and thrust limit displays on the E/WD
Engine/thrust levers:
What redundancy does the FADEC have?
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Dual Channel redundancy – one channel is active while the other is standby.
Engine/thrust levers:
When does continuous ignition automatically operate?
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º flameout detection
º Engine Interface Unit (EIU) failure
º Ignitiion delay during start
Engine/thrust levers:
How many igniters fire on manual or in-flight starts?
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Both A and B
Engine/thrust levers:
What is the power source for the FADEC?
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º its own alternator making it independent of the aircraft electrical system when N2 is above a set value.
º If this alternator fails the FADEC automatically switches to aircraft electrical power.
Engine/thrust levers:
When will the FADEC abort a start?
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º Hot start
º Stalled start
º No ignition
Engine/thrust levers:
If the FADEC detects a fault during automatic start, is any crew intervention required?
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No. The FADEC will discontinue the start, clear the engine, and attempt a restart (if warranted)
automatically
Engine/thrust levers:
When does the FADEC command a higher engine idle speed?
FCOM-DSC-70-40-40, FCOM-DSC-70-40-50
º Bleed demands
º Approach Configuration
º High engine or IDG temperatures
Engine/thrust levers:
What determines the maximum thrust the A/THR system will be able to command?
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The position detent of the thrust lever
Engine/thrust levers:
What controls the engine LP fuel valves?
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º Engine MASTER switch
º ENGINE FIRE pushbutton
Engine/thrust levers:
What does a fault light on the ENG panel indicate?
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º Auto start abort
º Switch disagreement between HP valve and its commanded position
APU:
What does the green AVAIL light on the APU START pushbutton indicate?
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APU N is above 99.5% or 2 secs after N reaches 95%
APU:
With the APU green AVAIL light ON and the EXT PWR green AVAIL light on, which system is powering the
aircraft?
FCOM-DSC-24-10-30-10, FCOM-DSC-24-20
APU
AAA: Avail, Avail, APU
APU:
What does an amber FAULT light in the APU MASTER SW pushbutton indicate?
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The Electronic Control Box (ECB) commanded an auto shutdown of the APU
APU:
How long should you wait to push the APU START pushbutton after engaging the APU MASTER switch?
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3 sec
APU:
What does an amber FAULT light in the APU BLEED pushbutton indicate?
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An APU bleed leak
