737 Engines Flashcards
Explain what is indicated by a REV indication above the N1 indicator.
Amber REV means the reverser is in transit
Green REV means the reverser is deployed
Describe Engine Abnormal Start Protection (ground starts only)
EEC monitors all starts. It will shut down start for:
1. HOT starts
2. EGT exceedance
3. Wet Start
What is meant by the amber reverser light on the overhead panel?
Illuminates when the reverser is commanded to stow and extinguishes 10 seconds later when the isolation valve closes. If it stays illuminated for more than 12 seconds a malfunction has occurred and a MASTER CAUTION and ENG system annunciator will light up.
Explain meaning of the following APU panel lights:
LOW OIL PRESSURE (amber light)
MAINT (blue light)
FAULT (amber light)
OVERSPEED (amber)
LOW OIL PRESSURE (amber light) - obvious
MAINT (blue light) - contact maintenance but APU can still be operated
FAULT (amber light) - malfunction causing auto shutdown
OVERSPEED (amber) - RPM limit exceedance or the overspeed protection feature self test has failed during a shutdown.
What do the EEC switches do?
ON indicates normal EEC (computer) control of engines
ALTN (amber) - engine has switched to alternate control mode or this mode has been selected manually. If automatically switched the mode will initially be “soft mode” which will be indicated by both the ON and ALTN lights being on at the same time
Explain meaning of amber ENG FAIL alert
Displayed on EGT indicators when engine is operating below 50% N2 - AND - the engine start lever is in the idle position.
What is the meaning of the red framed boxes around the N1, N2 or EGT indicators?
On the ground after engine shutdown this indicates that an exceedance has occurred.
When should the engine start lever (ESL) be placed in the IDLE position during engine start?
When N2 reaches maximum motoring speed of at least 25% N2 and N1 rotation is observed.
When does ENGINE START switch automatically move from GRD to OFF?
automatically at 56% N2 RPM. If not, then pilot must position switch to off.
What causes the APU to automatically shut down?
FIRE
LOW OIL PRESSURE
OVER SPEED
FAULT
When is APU ready to accept bleed air or electrical load?
When the blue APU GEN OFF BUS light illuminates.
A two minute stabilization period is recommended before turning on the bleed air.
Describe function of N1 SET knobs. Inner and outer knobs.
AUTO
BOTH
1 or 2
Outer knob:
AUTO allow N1 bug to be set automatically by the FMC limit page
BOTH - both engine N1s can be set manually
1 and 2 can be set individually
Inner Knob - is spring loaded to center and is used to set the actual N1 speed
How is are the engine EECs switched from the soft to the hard alternate mode?
- reducing thrust lever to idle or
- manually selecting ALTN with the EEC switches.
How long will the APU continue to run after it is shut off?
One minute
What are the altitude parameters of the engine restart envelope
An engine can be restarted anywhere from sea level to 24,000 ft pressure altitude.
What is the speed envelope for a Cross Bleed start?
How about for a Windmill start
Cross Bleed - Roughly 140 to 300 knots
Windmill - 300 kts up to Max speed
(Both envelopes start to change at 15,000 ft) see QRH 7.11
