737 Systems: Engines/APU

Question 1

Which engine component keep the engine within operating parameters and limits its maximum thrust?

Answer 1

EEC (Electronic Engine Control)

Question 2

What is the indication and EEC is operating in Normal Mode?

Answer 2

The white ON light is illuminated.

Question 3

With an EEC switch showing BOTH ALTN and ON, thrust levers NEVER having been brought to IDLE, what mode is the EEC in?

Answer 3

Soft Alternate

Question 4

The EECs provide redline protections for which parameters?

Answer 4

N1 and N2 in both Normal and Alternate modes

Question 5

When do EECs select approach idle minimum thrust?

Answer 5

Anti-Ice ON and/or Flaps in Landing configuration

Question 6

What is indicated by the ENGINE CONTROL (amber) light?

Answer 6

An EEC fault detected that is NON-DISPATCHABLE (Aircraft must be on the ground)

Question 7

What indicates an EGT exceedance AFTER engine shut down?

Answer 7

A red box will be displayed around the digital readout.

Question 8

What causes the ENG FAIL (amber)

Answer 8

If N2 falls below a sustainable idle (50% N2) WITH the Engine Start Lever is in the IDLE position

Question 9

How is an EGT exceedance displayed?

Answer 9

The digital readout, box, needle, and indicator turn red.

Question 10

How do you display the fuel used?

Answer 10

By moving the FUEL FLOW switch to the USED position. It is displayed for 10 seconds on the engine display under FF

Question 11

What does the OIL FILTER BYPASS light indicate?

Answer 11

There is an IMPENDING bypass of the Scavenge Oil Filter.

Question 12

Which positions does a start switch need to be in for BOTH igniters to activate in case of an engine flameout?

Answer 12

Any position.

Question 13

During ground starts, which malfunctions do the EEC monitor for?

Answer 13

-Impending Hot Starts
-Wet Start (No Lightoff)
-Engine Stalls (Hung Start)
-EGT start limit exceedances

(These DO NOT function in-flight)

Question 14

How is an impending hot start indicated during ground starting?

Answer 14

If there is 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.

Question 15

What are the reverse thrust indications on the Upper Display above the N1 indicators?

Answer 15

-Amber REV: reverser moving from the stowed position
-Green REV: reverser reaches deployed position

Question 16

What causes a REVERSER (amber) light on the Engine Panel?

Answer 16

When the thrust reverser is COMMANDED to stow.

Question 17

What does the APU provide?

Answer 17

• AUX AC power
  -Bleed air for engine starting and air conditioning

Question 18

What will cause the automatic shutdown of the APU?

Answer 18

-Fire
-HOTLOP
-Fault
-Overspeed
-Fuel Control Unit failure
-EGT Exceedance

Question 19

Will the APU operate with the Battery Master OFF?

Answer 19

No.

Question 20

How long should the APU operate AFTER illumination of the APU GEN OFF BUS light before using it as a Bleed Air Source?

Answer 20

2 minutes

Question 21

How long should you wait after turning off the APU switch OFF before turning the Battery Master OFF?

Answer 21

2 minutes