Max Engine Flashcards
Which system regulates the engine?
EEC - Electronic engine Control
A dual-channel Electronic Engine Control (EEC) regulates each engine.
The EEC monitors autothrottle and Flight Crew inputs to automatically set engine thrust.
What is the indication an EEC is operating in normal mode?
White ON light
In normal mode, white ON lights are the only lights illuminated on the associated EEC switch on the engine panel.
What are the indications of EEC hard alternate and soft alternate modes?
White ON
Soft Mode - the ALTN switch illuminates and the ON indication remains visible.
Hard Mode - If hard alternate mode is entered by reducing the thrust lever to idle while in soft alternate mode (pictured on EEC 1), the ALTN switch remains illuminated and the ON indication remains visible. When ALTN is selected manually, the ON indication is blanked (pictured on EEC 2).
The EECs provide redline overspeed protection for which engine parameters(s)?
N1 and N2
The EECs provide N1 and N2 redline overspeed protection in both normal and alternate modes.
When do the EECs select approach idle for the operating engine?
Approach idle is selected:
* with Flaps 15 or greater, or
* any time the flaps are not fully retracted and engine anti-ice is on
Approach idle improves engine acceleration time in the event of a go-around.
Approach idle is maintained until after touchdown, when ground minimum idle is selected.
In flight, if a fault prevents the EEC from receiving flap or anti-ice signals, approach idle schedule begins below 19,000 ft MSL.
What does the ENGINE CONTROL light indicate and when is it armed?
non-dispatchable fault in the EEC
The light operates when:
* the respective engine is operating, and
* the aircraft is on the ground, and
* below 80 kts prior to takeoff, or 30 seconds after touchdown
When is the ENG FAIL alert displayed?
Engine is operating at a condition below sustainable idle (62%) and the engine start lever is in the IDLE position.
The alert remains until:
* the engine recovers,
* the engine start lever is moved to CUTOFF, or
* the fire switch is pulled
How are the secondary engine instruments toggled?
When ENG is selected on the Multi-Function Display panel (toggled)
How are EGT redline exceedances indicated?
Indicated by red lines.
The digit readout, box, needle, and indicator change color to red or amber.
How is an EGT exceedance displayed after engine shutdown?
On the ground, after engine shutdown, a box the color of the exceedance (red or amber) displays around the digital readout where the exceedance occurred.
How is the N1/SPD REF SET page displayed on the Max Display System?
Selecting INFO on the MFD panel on the forward electronic panel.
What does the THRUST crew alert on the Engine Display indicate?
Thrust is more or less than the commanded thrust.
THRUST alert is displayed in conjunction with the N1 command sector illuminating amber.
What are the indications of reverse thrust on the Engine Display?
REV (amber) - thrust reverser is moved from stowed position.
REV (green) - reverser is deployed.
What does selecting FUEL USED display?
Fuel used since the last reset for 10 seconds, then
automatically revert to fuel flow.
What does the illumination of the FUEL FLOW crew alert indicate?
Fuel flow is abnormally high when compared to the FMC expected fuel flow.
What does the illumination of the OIL FILTER BYPASS light indicate?
Impending bypass of oil supply filter.
Which engine start ignitor is available on standby power?
The right igniter plug receives power from the AC standby bus.
(FYI - Which is why we start the day on IGN R, to verify the standby AC bus is properly supplying power to the ignitor)
The auto-relight function of the Engine Start System is available when the engine start switches are in which position(s)?
Start switch is in any position.
What does MOTORING on the N2 indicator indicate?
Bowed Rotor Motoring (BRM) straightens the N1 and N2 rotor shafts which will bow due to thermal buildup after the engine is shut down.
BRM is active for 6-90 seconds on the ground only. During BRM, MOTORING is displayed on the N2 gauge between 18% and 24% N2.
Which start malfunction(s) do the EECs monitor for during engine start?
During ground starts:
Hot starts
Engine stalls
EGT start limit exceedances
Wet starts.
These protection features do not function during in-flight starts.
How is an impending hot start indicated during engine starting?
For a hot start, start limit, or stall:
White box surrounding the EGT digital readout flashes white.
The EEC turns off the ignition and shuts off fuel to the engine for an impending hot start or stall.
The flashing white box resets when the start lever is moved to CUTOFF.
What does the illumination of the REVERSER LIMITED light indicate?
Fault in the thrust reverser system limits reverser thrust. The thrust reverser will not deploy or reverse thrust will be limited to idle if commanded.
The REVERSER LIMITED light, located on the aft overhead panel
What does the illumination of the REVERSER COMMAND light indicate?
Reverse thrust lever is not in the down position in flight.
What does the APU provide?
Bleed air for engine starting or air conditioning.
An AC electrical generator on the APU provides an auxiliary AC power source.
Does the APU require the BAT switch to be on to operate?
Yes
APU requires the following:
* APU fire switch on the overheat/fire panel must be IN
* APU fire control handle on the APU ground control panel must be IN
* BAT switch must be ON
How long should the APU run after illumination of the APU GEN OFF BUS light before opening the APU bleed valve?
2 minutes
Operate the APU for two full minutes before using it as a bleed air source. This two-minute stabilization is recommended to extend the service life of the APU.
How long should a pilot wait after the APU switch is selected OFF before selecting the BAT switch OFF?
3 minutes
To allow adequate time for the APU inlet door
to fully close.
What will cause the automatic shutdown of the APU?
Automatic shutdown protection is provided for:
* RPM overspeed conditions
* low oil pressure
* high oil temperature
* APU fire
* Fuel Control Unit failure
* EGT exceedance, and
* other system faults monitored by the ECU
