Engine

Question 1

Which system regulates the engine?

Answer 1

A dual-channel Electronic Engine Control (EEC) regulates each engine. The EEC monitors autothrottle and Flight Crew inputs to automatically set engine thrust.

Question 2

What is the indication an EEC is operating in normal mode?

Answer 2

In normal mode, white ON lights are the only lights illuminated on the associated EEC switch on the engine panel.

Question 3

What are the indications of EEC hard alternate and soft alternate modes?

Answer 3

Hard alternate mode is indicated by the ALTN illuminated with the EEC ON light blanked out. Soft Alternate mode is indicated by both the ALTN light and the EEC ON light at the same time.

Question 4

The EECs provide redline overspeed protection for which engine parameters(s)?

Answer 4

The EECs provide N1 and N2 redline overspeed protection in both normal and alternate modes.

Question 5

When do the EECs select approach idle for the operating engine?

Answer 5

Approach idle improves engine acceleration time in the event of a go-around. Approach idle is selected: • with Flaps 15 or greater, or • any time the flaps are not fully retracted and engine anti-ice is on Approach idle is maintained until after touchdown, when ground minimum idle is selected.

Question 6

What does the ENGINE CONTROL light indicate and when is it armed?

Answer 6

A non-dispatchable fault in the EEC will illuminate the ENGINE CONTROL light.

The light operates when:
• the respective engine is operating, and
• the aircraft is on the ground, and
• below 80 kts prior to takeoff, or 30 seconds after touchdown.

Question 7

When is the ENG FAIL alert displayed?

Answer 7

An ENG FAIL alert is displayed on the EGT indicator when the respective engine is operating at a condition below sustainable idle and the engine start lever is in the IDLE position. The alert remains until: • the engine recovers, • the engine start lever is moved to CUTOFF, or • the fire switch is pulled.

Question 8

How are the secondary engine instruments toggled?

Answer 8

• ENG is selected on the Multi-Function Display panel (toggled) Also displays in the following situations • displays are initially powered • a secondary engine parameter exceedance occurs • in flight and an engine start lever is moved to CUTOFF • in flight and N2 is below idle RPM (ENG FAIL).

Question 9

How are EGT redline exceedances indicated?

Answer 9

• red when EGT reaches or exceeds redline (maximum takeoff EGT, maximum continuous EGT, maximum start EGT).

Question 10

How is an EGT exceedance displayed after engine shutdown?

Answer 10

The readout displays red when an operating limit is exceeded in flight. Once on the ground, after engine shutdown, a red box around the readout indicates an in-flight exceedance has occurred.

Question 11

How is the N1/SPD REF SET page displayed on the Max Display System?

Answer 11

The N1/SPD REF SET display is populated by selecting INFO on the MFD panel on the forward electronic panel. There are two sections to the INFO display function. The left side allows the manual setting of the N1 thrust target. The right side allows the manual setting of V-speeds, gross weight, and the white bug. The radio (diamond) buttons represent the various selections. When the radio button is gray, the button is enabled and can be highlighted and selected. When the radio button is cyan, the button is disabled and cannot be highlighted or selected. When the INFO display format is selected for display, a highlight will appear on the AUTO radio button on the N1 SET side of the display.

Question 12

What does the THRUST crew alert on the Engine Display indicate?

Answer 12

Illumination of THRUST indicates the associated engine thrust is more or less than the commanded thrust. THRUST alert is displayed in conjunction with the N1 command sector illuminating amber.

Question 13

What are the indications of reverse thrust on the Engine Display?

Answer 13

REV (amber) indicates the associated thrust reverser is moved from stowed position. REV (green) indicates the thrust reverser is deployed.

Question 14

What does selecting FUEL USED display?

Answer 14

Selecting USED will display fuel used since the last reset for 10 seconds, then automatically revert to fuel flow.

Question 15

What does the illumination of the FUEL FLOW crew alert indicate?

Answer 15

Illumination of FUEL FLOW (amber) indicates fuel flow is abnormally high when compared to the FMC expected fuel flow.

Question 16

What does the illumination of the OIL FILTER BYPASS light indicate?

Answer 16

Illumination of OIL FILTER BYPASS (amber) indicates the impending bypass of oil supply filter.

Question 17

Which engine start ignitor is available on standby power?

Answer 17

The right igniter plug. It receives power from the AC standby bus via the hot battery bus and the static inverter (DC from batteries to AC).

Question 18

The auto-relight function of the Engine Start System is available when the engine start switches are in which position(s)?

Answer 18

An auto-relight capability is provided for flameout protection when the start switch is in any position. When the EEC detects an engine flameout, both igniters are activated regardless of the positioning of the ignition select switch. A flameout is detected when an uncommanded rapid decrease in N2 occurs, or N2 is below idle RPM. Ignition is not limited to 30 seconds while the engine remains sub-idle.

Question 19

What does MOTORING on the N2 indicator indicate?

Answer 19

Bowed Rotor Motoring straightens the N1 and N2 rotor shafts which will bow due to thermal buildup after the engine is shut down. BRM is active for 6–90 seconds on the ground only. During BRM, MOTORING is displayed on the N2 gauge between 18% and 24% N2.

Question 20

Which start malfunction(s) do the EECs monitor for during engine start?

Answer 20

During ground starts, the EEC monitors engine parameters to detect impending hot starts, engine stalls, EGT start limit exceedances, and wet starts. These protection features do not function during in-flight starts.

Question 21

How is an impending hot start indicated during engine starting?

Answer 21

If an impending hot start is detected by 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. The EEC turns off the ignition and shuts off fuel to the engine for an impending hot start or stall. The flashing white box resets when the start lever is moved to CUTOFF.

Question 22

What does the illumination of the REVERSER LIMITED light indicate?

Answer 22

The REVERSER LIMITED light, located on the aft overhead panel, illuminates in flight when a fault in the thrust reverser system limits reverser thrust. The thrust reverser will not deploy or reverse thrust will be limited to idle if commanded. The REVERSER LIMITED light illuminates on the ground when a malfunction has occurred. Any time the REVERSER LIMITED light illuminates, the ENG System Annunciator and MASTER CAUTION lights illuminate.

Question 23

What does the illumination of the REVERSER COMMAND light indicate?

Answer 23

The illumination of the REVERSER COMMAND light indicates the reverse thrust lever is not in the down position in flight.