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737 Systems > Engines > Flashcards

Engines Flashcards

1
Q

N1 or N2 redline

A

Operating limit

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2
Q

N1/N2 red display

A

Operating limit exceeded

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3
Q

EGT amber band

A

Lower end of band = max continuous limit

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4
Q

EGT amber display

A

Max continuous limit exceeded

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5
Q

EGT redline

A

Takeoff limit (additional redline displayed for start limit)

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6
Q

EGT red display

A

Max takeoff or start limit exceeded

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7
Q

What is indicated by a LOW OIL PRESSURE Alert?

A

Oil pressure at or below redline

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8
Q

What is minimum oil quantity for dispatch?

A

12 quarts

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9
Q

What conditions cause the ENG FAIL Alert to display?

A

Start Lever IDLE and N2

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10
Q

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

A

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

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11
Q

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

A
  • Left igniter Associated AC Transfer Bus

* Right igniter AC Standby Bus

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12
Q

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

A

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

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13
Q

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

A

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

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14
Q

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?

A

When N2 drops below idle

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15
Q

Which igniters are activated with ENGINE START Switch in FLT?

A

With Start Lever in IDLE, both igniters are activated

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16
Q

When must ENGINE START Switch be selected to CONT?

A
  • Heavy rain

* Emergency descent

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17
Q

When must ENGINE START Switch be selected to FLT?

A
  • Volcanic ash
  • Severe turbulence
  • High engine vibration
  • Loss of thrust on both engines
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18
Q

What normally occurs when thrust reversers are deployed?

A
  • Electro-mechanical lock releases

* Isolation valve opens (if on ground or

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19
Q

When are thrust reversers enabled for deployment?

A

On the ground or

20
Q

What normally occurs when thrust reversers are deployed?

A
  • Electro-mechanical lock releases

* Isolation valve opens (if on ground or

21
Q

What normally occurs when thrust reversers are stowed?

A
  • 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)
22
Q

When is the auto-restow circuit activated?

A

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

23
Q

What happens when the auto-restow circuit is activated?

A

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

24
Q

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

A
  • 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
25
Q

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

A

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.

26
Q

Describe idle modes selected by the EECs:

A

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.

27
Q

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

A

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

28
Q

What is indicated by the ENGINE CONTROL Lights?

A

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

29
Q

Describe idle modes selected by the EECs:

A

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.

30
Q

Describe EEC Normal mode of operation:

A

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.

31
Q

Describe EEC Soft Alternate mode of operation:

A

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.

32
Q

Describe EEC Hard Alternate mode of operation:

A

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).

33
Q

What limitations apply for takeoff with EECs in Alternate mode?

A
  • 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
34
Q

What structural protection is provided by the EECs?

A

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

35
Q

What abnormal start protection is provided by the EECs?

A
  • 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)
36
Q

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

A

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

37
Q

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

A

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

38
Q

What are the starter duty cycle limits?

A

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

39
Q

Engine Start Abort conditions:

A
  • 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)
40
Q

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

A

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

41
Q

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

A

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

42
Q

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

A

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

43
Q

EGT rapidly approaching or exceeding start limit actions:

A

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

44
Q

No oil pressure indication (by stabilized idle) actions:

A

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

45
Q

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

A

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

46
Q

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

A

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

737 Systems (12 decks)

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