Engines and APU

Question 0

What is the primary thrust indication for the RR and PW engines?

Answer 0

EPR

Question 1

What does and amber REV indicate.

Answer 1

That a reverser is in transit.

Question 2

Where is Max EPR acquired from what is it based on and how is it indicated?

Answer 2

Max EPR is acquired from the EEC or the TMC and is based upon temp and pressure, it is indicated by dual amber radials.

Question 3

What is the “command sector” I regards to EPR?

Answer 3

Command sector is the difference between present and commanded EPR.

Question 4

How is reference EPR displayed?

Answer 4

TMC calculated reference EPR is displayed in green

FMS calculated reference EPR is displayed as magenta

Question 5

What does “bluegrass” (vvvvvvv) on the upper EICAS indicate?

Answer 5

Secondary indications should be visible on the lower EICAS screen.

Question 6

How are engine limits and Max exceedence numbers displayed?

Answer 6

Limits are displayed in RED, Max exceedence is displayed as WHITE numbers.

Question 7

How are caution ion ranges displayed?

Answer 7

Caution ranges are displayed as Amber.

Question 8

When are EGT caution ranges inhibited from display?

Answer 8

They are inhibited for 5 minutes on T/O and G/A.

Question 9

How is max continuous thrust displayed?

Answer 9

Max continuous thrust is displayed as an amber line.

Question 10

What activates EICAS COMPACT MODE?

Answer 10

COMPACT MODE is activated by loss of any one EICAS screen.

Question 11

In COMPACT MODE can you view the status page inflight?

Answer 11

NO, in COMPACT MODE you can only view the status page on the ground.

Question 12

What do the OIL PRESS lights to the left of the EICAS do?

Answer 12

They provide a cross check to the EICAS oil pressure indications. They use a sensor than the EICAS pressure sensor.

Question 13

What does BB in regards to engine vibration indicate?

Answer 13

BB on the VIB indicator means BROAD BAND.

Question 14

In regards to the VIB indicator what is required for PW engines?

Answer 14

The PW engines require the VIB indicator to be displayed for takeoff.

Question 15

The EEC on PW engines does what?

Answer 15

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.

Question 16

What does the EEC do on the RR engine?

Answer 16

It is powered by a PMA and provides EPR protection by trimming fuel.

Question 17

If the EEC fails on a RR engine what provides engine protection?

Answer 17

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.

Question 18

On a PW engine what do illumination of the ELP (engine limit protect lights) indicate?

Answer 18

You need to manually observe thrust limits.

Question 19

Does the RR engine have ELP lights?

Answer 19

No

Question 20

What are the takeoff power settings used in the 757?

Answer 20

Standard power = “de-rated” thrust achieved through using an “assumed temperature”

Max Power

Question 21

What does climb 1 and climb 2 do on a;
RR
PW

Answer 21

RR Climb 1 = 6% thrust reduction climb 2 = 12% reduction

PW climb 1 = 8% thrust reduction climb 2 = 15% reduction

Question 22

Describe the START SELECTOR positions.

Answer 22

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

Question 23

What are the engine starter duty cycles?

Answer 23

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.

Question 24

What is an abnormal start?

Answer 24

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

Question 25

When do the in-flight engine start parameters display?

Answer 25

They display with the FCS (fuel control switch) in cutoff, N3 below idle, FIRE switch not pulled, both EICAS screens working.

Question 26

When would you use the “RICH” position to start a RR engine?

Answer 26

When EGT indicates 0 degrees.

Question 27

What does Alan APU FAULT light indicate?

Answer 27

Internal APU fault, shutdown or fire.

Question 28

To what altitude are APU electrics available?

Answer 28

42,000 feet.

Question 29

To what altitude are APU pneumatics available?

Answer 29

17,000 feet

Question 30

What are the APU starter duty limits?

Answer 30

3 start attempts in 60 minutes.

Question 31

On the ground, what happens to an APU that is running if you select the main battery OFF?

Answer 31

The APU shutsdown without fire detection.