Engines, APU Flashcards
Identify the conditions that would lead to an aborted engine start and accomplishment of the Aborted Engine Start checklist.
- Oil pressure rise does not occur.
- Fuel flow is abnormally high or fluctuating.
- EGT does not increase by 20 seconds after the FUEL CONTROL switch is positioned to RUN.
- N1 fails to increase after EGT rise
- EGT quickly nears or exceeds the start limit.
- Oil pressure indication is not normal by the time the engine is stabilized at idle
Recall the required engine warm up period prior to the application of T/O thrust.
• Required warm up time is 3 minutes.
• Target warm up time is 5 minutes.
Note: Do not delay takeoff after 3 minute warm-up period.
Recall the engine cool down recommendations prior to engine shutdown.
- Run the engine for at least 3 minutes.
* Shutdown may be accomplished earlier for gate arrival
Describe when the FUEL CONTROL switch should be placed to RUN during an engine start.
- Verify oil pressure increase and N2 rotation
- When N2 is at 25%, or if 25% N2 is not possible at maximum motoring speed, attempt the start at a minimum of 18% N2 (757) or 15% N2 (767).
A magenta bug (fuel on command bug) appears at:
18% N2 on the 757
15% N2 on the 767
Recall the APU starter duty cycle.
The starter duty cycle is a maximum of 3 consecutive starts or attempts within a 60 minute period.
Recall the maximum altitude to use APU Electrics.
Electrical power is available throughout the entire airplane operating envelope
Recall the maximum altitude to use APU Pneumatics.
• In flight, APU bleed air is available up to approximately 17,000 feet
Recall the EEC’s provide overboost, N1 and N2 overspeed protection, but no ________ over temperature protection.
EGT
Recall the primary indication for setting thrust on PW engines.
EPR
Recall the primary indication for setting thrust on GE engines.
N1
Explain how to cancel the APU shutdown sequence if OFF is selected and the RUN light is still illuminated.
• Momentarily move the APU selector to the START position.
Recall the meaning of an illuminated APU RUN light.
• The APU is at operating speed
Recall the meaning of an illuminated APU FAULT light.
APU FAULT light
• Illuminated (amber):
- The APU has automatically shut down.
- The APU fuel valve disagrees with the commanded position.
- A fault is sensed.
Note: The FAULT light momentarily illuminates during an APU start because the APU fuel valve initially disagrees with the commanded position.
Recall the engine starter duty cycle.
- Continuous for 5 minutes
* Cool for 30 seconds per minute of operation
Recall the meaning of an illuminated L or R ENG OIL PRESS light.
- The respective oil pressure is at or below the minimum value.
- The oil pressure switch has malfunctioned.
Recall the oil quantity requirements.
- 17 quarts recommended for start.
- If oil quantity is less than 17 quarts, verify 8 quarts following engine warm-up with engine at idle.
- If oil quantity is less than 8 quarts following engine warm-up, Dispatcher Approval is required.
Understand the controls and indicators on the Thrust Mode Select Panel (TMSP).
- Pushing a switch on the TMSP manually selects a desired thrust reference mode.
- Verification of the selected mode being active is displayed above the primary thrust reference (N1 or EPR as appropriate).
- Rotating the TEMP SEL knob is a means of selecting an assumed temperature in lieu of using the FMS to enter an assumed temperature.
- If an assumed temperature has been entered and normal thrust (takeoff power) is desired, selecting TO/GA on the TMSP will eliminate the assumed temperature and select normal thrust (takeoff power).
Recall the meaning of a TAI indication on the upper EICAS display.
- Displayed (green) - engine anti–ice is on
* Displayed (amber) - engine anti–ice is on, but N1 is too low
Know where the EICAS TAT is displayed.
• Upper EICAS
Note: On the ground, TAT approximates Outside Air Temperature
Understand how engine exceedances are displayed on the EICAS.
- The current exceedance is displayed in red
* The max exceedance attained is displayed by a white number below the boxed number.
Recall the function of the ENG START selectors.
• GND (push-in and rotate) –
- Opens the start valve to supply starter air.
- Arms the selected igniter(s).
- The selector is magnetically held in the GND position until 50% N2 RPM.
• AUTO –
- The selector releases to AUTO at 50% N2 RPM.
- Closes the start valve and terminates ignition.
- The selected igniter(s) operate continuously with the L.E. slats extended or engine anti-ice on.
• OFF –
- No ignition.
• CONT –
- The selected igniter(s) operate continuously.
- There is no operating time limit.
• FLT –
- Both igniters operate continuously regardless of the ignition selector position
- There is no operating time limit.
Recall the function of the L/R FUEL CONTROL switches.
FUEL CONTROL switches • RUN – - The normal position for engine operation - Opens the engine and spar fuel valves - Activates the selected igniter(s). • CUT OFF – - Closes the engine and spar fuel valves - Terminates ignition.
Recall the indications for the Thrust Reverser System
• REV (amber)
- When the reverser is unlocked or in transit.
• REV (green)
- The reverser is fully deployed
