Engines

Question 1

N1 or N2 redline

Answer 1

Operating limit

Question 2

N1/N2 red display

Answer 2

Operating limit exceeded

Question 3

EGT amber band

Answer 3

Lower end of band = max continuous limit

Question 4

EGT amber display

Answer 4

Max continuous limit exceeded

Question 5

EGT redline

Answer 5

Takeoff limit (additional redline displayed for start limit)

Question 6

EGT red display

Answer 6

Max takeoff or start limit exceeded

Question 7

What is indicated by a LOW OIL PRESSURE Alert?

Answer 7

Oil pressure at or below redline

Question 8

What is minimum oil quantity for dispatch?

Answer 8

12 quarts

Question 9

What conditions cause the ENG FAIL Alert to display?

Answer 9

Start Lever IDLE and N2

Question 10

What is indicated by the A/T LIM (Autothrottle Limit) annunciation above the N1 indicators?

Answer 10

FMC not providing valid N1 limit values – when this happens, A/T computer calculates a degraded N1 limit

Question 11

Each engine has two igniter plugs. Which buses are they powered by?

Answer 11

• Left igniter Associated AC Transfer Bus

* Right igniter AC Standby Bus

Question 12

With ENGINE START Switch in AUTO, when is ignition provided?

Answer 12

Ignition to selected igniter when engine running and
• Flaps extended below 18,000’, or
• Engine anti-ice on

Ignition to both igniters with Start Lever IDLE and
• Uncommanded rapid decrease in N2, or
• N2 below idle RPM

Question 13

Which igniters are normally activated with ENGINE START Switch in CONT?

Answer 13

With engine operating and Start Lever in IDLE, the selected igniters are activated

Question 14

With Start Lever in IDLE and ENGINE START Switch in CONT, when is ignition from both igniters automatically provided, regardless of position of Ignition Select Switch?

Answer 14

When N2 drops below idle

Question 15

Which igniters are activated with ENGINE START Switch in FLT?

Answer 15

With Start Lever in IDLE, both igniters are activated

Question 16

When must ENGINE START Switch be selected to CONT?

Answer 16

• Heavy rain

* Emergency descent

Question 17

When must ENGINE START Switch be selected to FLT?

Answer 17

• Volcanic ash
• Severe turbulence
• High engine vibration
• Loss of thrust on both engines

Question 18

What normally occurs when thrust reversers are deployed?

Answer 18

• Electro-mechanical lock releases

* Isolation valve opens (if on ground or

Question 19

When are thrust reversers enabled for deployment?

Answer 19

On the ground or

Question 20

What normally occurs when thrust reversers are deployed?

Answer 20

• Electro-mechanical lock releases

* Isolation valve opens (if on ground or

Question 21

What normally occurs when thrust reversers are stowed?

Answer 21

• Idle reverse selected when Reverser Lever lowered to Detent No. 1
• Allow RPM to decelerate to idle reverse, then move Reverser Levers full down (do not pause between Detent No. 1 and stow position)
• Thrust reverser control valve moves to stowed position when Reverser Lever lowered to stow position
• Amber REV displayed above N1 indicators (as hydraulic pressure moves translating sleeves forward)
• Amber REV extinguishes (as isolation valve closes and electro-mechanical lock engages)

Question 22

When is the auto-restow circuit activated?

Answer 22

When actual reverser sleeve position disagrees with commanded position (incomplete stowage or uncommanded movement toward deployed position)

Question 23

What happens when the auto-restow circuit is activated?

Answer 23

It opens the isolation valve and holds the thrust reverser control valve in the stowed position until the reverser is commanded to deploy or maintenance action is taken

Question 24

What is indicated by the REVERSER Light on the aft overhead panel?

Answer 24

• Auto-restow circuit activated
• Thrust reverser control valve not in commanded position
• Isolation valve not in commanded position
• Sleeve(s) not in commanded position
• Synchronization shaft lock circuitry failure

Question 25

Will the REVERSER Light illuminate during normal operation of the thrust reversers?

Answer 25

Yes, it will normally be on when reverser is commanded to stow. Light should go out within 10 seconds, when isolation valve closes – if on more than 12 seconds, a malfunction has occurred and M/C + ENG Sys Ann Lt will illuminate.

Question 26

Describe idle modes selected by the EECs:

Answer 26

Ground Idle Used for all ground operations Flight Idle Used for most flight operations Approach idle Used in flight if: • Flaps in landing configuration, or • Engine anti-ice on If flap/anti-ice signals unavailable, approach idle automatically selected below 15,000’. Approach idle automatically reverts to ground idle 5 seconds (3LC> 2 seconds) after touchdown.

Question 27

Each EEC has two independent channels. Can they be manually selected?

Answer 27

No, the EEC automatically alternates between channels with each start attempt or if the operating channel fails

Question 28

What is indicated by the ENGINE CONTROL Lights?

Answer 28

“No go” fault in engine control system (light operates on ground only – it is inhibited from 80K during takeoff to 30 seconds after touchdown)

Question 29

Describe idle modes selected by the EECs:

Answer 29

Ground Idle Used for all ground operations Flight Idle Used for most flight operations Approach idle Used in flight if: • Flaps in landing configuration, or • Engine anti-ice on If flap/anti-ice signals unavailable, approach idle automatically selected below 15,000’. Approach idle automatically reverts to ground idle 5 seconds (3LC> 2 seconds) after touchdown.

Question 30

Describe EEC Normal mode of operation:

Answer 30

Indicated by white ON in view on EEC Switch EEC uses sensed flight conditions and bleed air demand to calculate N1; compares commanded to actual N1 and adjusts fuel flow to achieve commanded N1.

Question 31

Describe EEC Soft Alternate mode of operation:

Answer 31

Indicated by white ON and amber ALTN on EEC Switch EEC automatically switches to this mode when required signals unavailable; uses last valid flight conditions to define parameters – no immediate change in thrust occurs, but as conditions change, thrust rating may be too high/low.

Question 32

Describe EEC Hard Alternate mode of operation:

Answer 32

Indicated by amber ALTN in view on EEC Switch Automatically reverts from soft alternate to hard alternate if thrust levers retarded to idle (no change in indication when this occurs); or, hard alternate mode can be manually selected by pushing EEC Switch (blanking ON indication). In hard alternate mode, EEC reverts to alternate thrust schedule (≥ normal mode thrust for same thrust lever position).

Question 33

What limitations apply for takeoff with EECs in Alternate mode?

Answer 33

* Both EECs must be in ALTN * Use 26K max thrust (27K max, if planned) * Do not use FMC takeoff N1 or QRH V-Speeds * Do not use autothrottle for takeoff

Question 34

What structural protection is provided by the EECs?

Answer 34

N1 and N2 redline overspeed protection – EECs do not provide normal EGT redline exceedance protection

Question 35

What abnormal start protection is provided by the EECs?

Answer 35

* Impending hot start (rapid EGT rise or EGT approaching start limit; indicated by flashing white box around EGT digital indication; no automatic shutdown) * EGT start limit exceeded (indicated by red EGT box and dial; EEC shuts off fuel and ignition; display turns white when temp drops below start limit; after both engines shutdown, box again turns red to remind crew of exceedance) * Wet start (no EGT rise within 15 seconds after Start Lever IDLE; EEC shuts off fuel and ignition)

Question 36

During a normal engine start, what are the indications that the start valve has closed?

Answer 36

ENGINE START Switch returns to AUTO (at 56% N2) and START VALVE OPEN Alert extinguishes

Question 37

What are the stabilized idle indications (ISA, @ S.L.)?

Answer 37

N1 20% EGT 410°C (320–520°C) N2 59% FF 600pph

Question 38

What are the starter duty cycle limits?

Answer 38

Maximum of 2 minutes on per start attempt, with minimum of 10 seconds between attempts

Question 39

Engine Start Abort conditions:

Answer 39

* No N1 rotation (before start lever raised to idle) * No EGT rise (within 10 sec ground/30 sec flight, after Start Lever IDLE) * No, or very slow increase in N1/N2 (after EGT rise) * EGT rapidly approaching or exceeding start limit * No oil pressure indication (by stabilized idle)

Question 40

No N1 rotation (before start lever raised to idle) actions:

Answer 40

ENGINE START Switch................................................................AUTO

Question 41

No EGT rise (within 10 sec ground/30 sec flight, after Start Lever IDLE) actions:

Answer 41

Start Lever........................................................CUTOFF Motor 60 seconds, then ENGINE START Switch................................................................AUTO

Question 42

No, or very slow increase in N1/N2 (after EGT rise) actions:

Answer 42

Start Lever........................................................CUTOFF Motor 60 seconds, then ENGINE START Switch................................................................AUTO

Question 43

EGT rapidly approaching or exceeding start limit actions:

Answer 43

Start Lever........................................................CUTOFF Motor 60 seconds, then ENGINE START Switch................................................................AUTO

Question 44

No oil pressure indication (by stabilized idle) actions:

Answer 44

Start Lever........................................................CUTOFF Motor 60 seconds, then ENGINE START Switch................................................................AUTO

Question 45

What actions do you take if any Engine Start Abort conditions occur after starter cutout?

Answer 45

Re-engage starter at 20% N2 by selecting ENGINE START Switch to GRD, then motor 60 seconds

Question 46

What actions are required if an engine fails to shutdown normally (e.g., EGT and fuel flow do not decrease)?

Answer 46

Pull the Fire Switch to shut off fuel (make AML entry)