Engines and APU Flashcards
What is the primary thrust indication for the RR and PW engines?
EPR
What does and amber REV indicate.
That a reverser is in transit.
Where is Max EPR acquired from what is it based on and how is it indicated?
Max EPR is acquired from the EEC or the TMC and is based upon temp and pressure, it is indicated by dual amber radials.
What is the “command sector” I regards to EPR?
Command sector is the difference between present and commanded EPR.
How is reference EPR displayed?
TMC calculated reference EPR is displayed in green
FMS calculated reference EPR is displayed as magenta
What does “bluegrass” (vvvvvvv) on the upper EICAS indicate?
Secondary indications should be visible on the lower EICAS screen.
How are engine limits and Max exceedence numbers displayed?
Limits are displayed in RED, Max exceedence is displayed as WHITE numbers.
How are caution ion ranges displayed?
Caution ranges are displayed as Amber.
When are EGT caution ranges inhibited from display?
They are inhibited for 5 minutes on T/O and G/A.
How is max continuous thrust displayed?
Max continuous thrust is displayed as an amber line.
What activates EICAS COMPACT MODE?
COMPACT MODE is activated by loss of any one EICAS screen.
In COMPACT MODE can you view the status page inflight?
NO, in COMPACT MODE you can only view the status page on the ground.
What do the OIL PRESS lights to the left of the EICAS do?
They provide a cross check to the EICAS oil pressure indications. They use a sensor than the EICAS pressure sensor.
What does BB in regards to engine vibration indicate?
BB on the VIB indicator means BROAD BAND.
In regards to the VIB indicator what is required for PW engines?
The PW engines require the VIB indicator to be displayed for takeoff.
The EEC on PW engines does what?
It is powered by a PMA and limits EPR by trimming fuel.
If EPR input fails it controls N1. If both EPR and N1 inputs fail it controls by limiting N2.
What does the EEC do on the RR engine?
It is powered by a PMA and provides EPR protection by trimming fuel.
If the EEC fails on a RR engine what provides engine protection?
When the EEC fails on the RR engine the ELC (engine limit controller) provides N1 protection by trimming fuel.
If the EEC and ELC fail observe engine limits.
On a PW engine what do illumination of the ELP (engine limit protect lights) indicate?
You need to manually observe thrust limits.
Does the RR engine have ELP lights?
No
What are the takeoff power settings used in the 757?
Standard power = “de-rated” thrust achieved through using an “assumed temperature”
Max Power
What does climb 1 and climb 2 do on a;
RR
PW
RR Climb 1 = 6% thrust reduction climb 2 = 12% reduction
PW climb 1 = 8% thrust reduction climb 2 = 15% reduction
Describe the START SELECTOR positions.
GND-opens the start valve, arms selected igniters, held until idle
AUTO-closes start valve,disarms ignition, provides automatic ignition when slats or anti-ice are selected.
CONT-operates selected igniters continuously
FLT-operates both igniters continuously
What are the engine starter duty cycles?
2 mins on then N3/2 back to 0, repeat X 2 then a 15 min cooling period.
RR only - one 4 minute cycle then 15 min cooling period.
What is an abnormal start?
No EGT within 20 secs. of selecting run or rich
EGT quickly nears or exceeds start limit
Oil pressure not normal at idle
Additional PW indications:
No N1 increase when EGT increases
N2 not at idle within 2 mins
When do the in-flight engine start parameters display?
They display with the FCS (fuel control switch) in cutoff, N3 below idle, FIRE switch not pulled, both EICAS screens working.
When would you use the “RICH” position to start a RR engine?
When EGT indicates 0 degrees.
What does Alan APU FAULT light indicate?
Internal APU fault, shutdown or fire.
To what altitude are APU electrics available?
42,000 feet.
To what altitude are APU pneumatics available?
17,000 feet
What are the APU starter duty limits?
3 start attempts in 60 minutes.
On the ground, what happens to an APU that is running if you select the main battery OFF?
The APU shutsdown without fire detection.
