Engines

Question 1

What type of engines does the 737NG have? Rated thrust?

Answer 1

2x CFM56-7 engines.

27,300 pounds depending.

Question 2

What is the N1 rotor consisted of?

Answer 2

Fan, low pressure compressor and low pressure turbine.

Question 3

What is the N2 rotor consisted of?

Answer 3

High pressure compressor and high pressure turbine. All engine gearboxes are powered off the N2 rotor including accessory gearbox and a bleed air starter drives the N2 rotor for engine start.

Question 4

How many ignitor plugs per engine?

Answer 4

2 congrolled through the IGN switch.

Question 5

T/F: The dual channel EECs ensure reliablity through automatic transfer in the event of a _______.

Answer 5

single channel failure.

Question 6

What are the two modes for the EECs?

Answer 6

Normal or Alternate (alternate has hard and soft mode).

Question 7

T/F: Max thrust is always available at the forward stop

Answer 7

true

Question 8

____ and ____ overspeed protection is provided by the EECs in both normal and alternate mode.

Answer 8

N1, N2

Question 9

T/F: The EECs provide EGT exceedance protection in normal.

Answer 9

false

Question 10

How do you get to alternate mode in the EEC?

Answer 10

EEC automatically goes to soft alternate when signals for normal are lost. This will be indicated by both the ON and ALTN lights in EEC switch.

Question 11

Going from Normal to Soft Alternate shouldn’t have any immediate effect on engine thrust since this mode does what?

Answer 11

uses last valid flight conditions to control parameters.

Question 12

How do you get to Hard Alternate for the EECs?

Answer 12

retarding thrust levers to idle or manually selecting ALTN via EEC switch.

Question 13

For a given thrust lever position, Hard alternate will _______.

Answer 13

Always provide thrust equal to or greater than that provided in Normal.

Question 14

What is the difference between ground min idle and flight min idle?

Answer 14

ground: selected during taxi out and after touchdown
flight: selected in flight unless approach idle is active.

Question 15

How is approach idle selected?

Answer 15

flaps are in landing configuration or anytime engine anti-ice is selected ON for either engine. Approach idle allows for better engine acceleration in event of go around.

Question 16

An AC power source is generally preferred but the engine can be started using ______only

Answer 16

battery

Question 17

What are the power sources for IGN L and IGN R?

Answer 17

IGN L: associated AC XFR BUS

IGN R: AC STBY BUS.

Question 18

Which ignition must be used for a battery start?

Answer 18

IGN R

Question 19

How do the EECs provide auto-relight capability?

Answer 19

In event of flameout both ignites are activated automatically when N2 RPM is below idle or a rapid uncommanded decrease in N2 RPM occurs.

Question 20

What does a magenta X-BLD mean?

Answer 20

ambient flight conditions require a crossbled start.

Question 21

______and _______ engine starts are available in flight however the abnormal start protections _________.

Answer 21

Windmill; crossbled; are not available.

Question 22

The _____ meters fuel through the ______ to control required engine thrust.

Answer 22

EEC; HMU (hydro-mechanical Unit)

Question 23

How many engine fuel pumps are there?

Answer 23

2; 1st stage is after spar fuel shutoff valve; 2nd is after fuel filter and goes to HMU.

Question 24

SPAR VALVE CLOSED and ENG VALVE CLOSED (blue ) indicate what?

Answer 24

position of the valves.

Question 25

Where is the fuel flow readings taken from?

Answer 25

just after the Engine Shutoff valve

Question 26

Oil from the engine driven oil pump is used for what?

Answer 26

lubricate the engine bearings and accessory gearbox.

Question 27

When does LOW OIL PRESSURE display?

Answer 27

oil pressure is at or below red line.

Question 28

Reverser operation will be at a _________ and some thrust asymmetry can be expected when using standby hydraulic pressure.

Answer 28

slower rate.

Question 29

The reverse thrust levers are mechanically restricted from operating until at _______.

Answer 29

IDLE. Also, reverse thrust can only be deployed when either RA is reading below 10' or ground mode is sensed through Air and Ground safety sensor.

Question 30

Movement of either reverser sleeve from the stowed position will illuminate an _________ indication.

Answer 30

amber REV.

Question 31

The green REV displays when?

Answer 31

once the reverser has reached the deployed position and the reverse thrust lever can no go to the second detent.

Question 32

If you get a MC light and the REVERSER amber light is on what has happened?

Answer 32

The reverser light has stayed on for more than 12 seconds. A mulfunction exists.

Question 33

Once a reverser is stowed, motion is inhibited by an ________ lock and a ________ operated locking actuator until extension is selected.

Answer 33

electro-mechanical lock; hydraulically

Question 34

Which engine indications are considered primary?

Answer 34

N1 & EGT

Question 35

The N1 redline always indicates the N1% RPM ?

Answer 35

operating limit

Question 36

After shutdown, a red box around a digital readout indicates what?

Answer 36

Upgrade To Pro | Inflight exceedance has occured.

Question 37

With AUTO selected, ref N1 readouts are replaced with ______ should the FMC source info become invalid.

Answer 37

dashes

Question 38

Where are thrust mode display annunciations shown?

Answer 38

Next to TAT on the Primary Eng DU

Question 39

When does Autothrottle limit indication show up?

Answer 39

FMC is not providing the AT system with N1 limit values. AT are essentially using degraded N1 thrust limit by EEC.

Question 40

Where is stabilized idle for start?

Answer 40

approx. 59% N2.

Question 41

How is max continuous EGT line displayed?

Answer 41

amber line at EGT

Question 42

A white flashing box of the EGT means what?

Answer 42

impending hot start or compressor stall.

Question 43

What does an amber ENG FAIL light mean on the EGT gauge?

Answer 43

Start lever is in IDLE and engine is operating below 50% N2. It remains until the engine recovers, the FIRE switch is pulled or the start lever is moved to CUTOFF.

Question 44

Fuel flow readouts can be adjusted to show?

Answer 44

Present FF or F used.