Engines & APU Flashcards
Which engine component keeps the engine within operating parameters and limits its maximum thrust?
The Electronic Engine Control (EEC)
What is the indication an EEC is operating in normal mode?
Displays ON (white) when normal control mode is selected.
With an EEC switch showing both ALTN and ON, thrust levers never having never been brought to IDLE, what mode is the EEC in?
ALTN (amber) when the EEC:
• has automatically switched to Soft Alternate Control Mode (ON light remains visible),
or
• has been selected manually to Hard Alternate Control Mode. If the Hard
Alternate Control Mode is selected by retardation of thrust lever to idle, ON will remain visible on the EEC switch.
If the Hard Alternate Control Mode is selected with the EEC switch, ON will no longer by visible.
The EECs provide redline protection(s) for which parameters?
The EEC provides N1 and N2 redline overspeed protection in both normal and alternate modes.
CAUTION! The EGT Limit must be observed by the Flight Crew because the EEC does not provide EGT Redline exceedance protection.
When do the EECs select approach idle minimum thrust?
Approach idle is selected with engine anti-ice selected ON for either engine or flaps in the landing configuration.
It is set to 72-79% N2 and will remain there until 5 seconds after landing for possible go-around, at which point ground minimum idle is selected.
What is indicated by the ENGINE CONTROL (amber) light?
The ENGINE CONTROL (amber) light illuminates when the EEC detects faults in
the Engine Control System that are not dispatchable. The light is functional when all of the conditions listed below are met:
- a no dispatch engine fault occurs
- engine is operating (N2 is greater than 50% with start lever in IDLE)
- aircraft on ground:
• groundspeed is below 80 kts prior to takeoff
• approximately 30 seconds after touchdown
What indicates an EGT exceedance after engine shutdown?
After engine shutdown on the ground, a red box will be displayed around the digital readout indicating that an in-flight exceedance has occurred
How is an EGT redline exceedance displayed?
The The EGT digital readout, box, needle, and indicator are displayed:
- red when EGT reaches or exceeds redline (Maximum Takeoff EGT, Maximum
Continuous EGT, Maximum Start EGT).
What causes the ENG FAIL (amber) alert on the EGT indicator?
An Engine Failure (ENG FAIL) Alert Indication is displayed in amber on the
EGT indicator when the respective engine is operating at a condition below sustainable idle (50% N2) and the Engine Start Lever is in the IDLE position.
How do you display the Fuel Used?
The FUEL FLOW switch (spring-loaded to center RATE position) in the USED position displays fuel used since last reset, and after 10 seconds the display will automatically revert to fuel flow
What does the OIL FILTER BYPASS light indicate?
The OIL FILTER BYPASS (amber) alert on the upper display appears when
there is an impending bypass of the Scavenge Oil Filter.
Which position(s) does a start switch need to be in for both igniters to activate in case of an engine flameout?
When the EEC detects an engine flameout, both igniters are activated
regardless of the positioning of the Ignition Select Switch.
During ground starts, which malfunction(s) do the EECs monitor for?
During ground starts, the EEC monitors engine parameters to detect:
- impending hot starts
- engine stalls
- EGT start limit exceedances, and
- wet starts
NOTE: These protection features do not function during in-flight starts.
How is an impending hot start indicated during ground starting?
If an impending hot start is detected by a rapid rise in EGT or EGT approaching the
start limit, or a compressor stall occurs, the white box surrounding the EGT digital
readout flashes white.
What are the reverse thrust indications on the Upper Display above the N1 indicators?
The REV (amber/green) indication, located on the upper display unit, illuminates amber when either reverser sleeve moves from the stowed position. As the thrust reverser
reaches the deployed position, the REV indication illuminates green and the reverse thrust lever can be raised to detent No. 2.
