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Atlas Air B747 April 2022 > Engine (Start/Ignition) *** > Flashcards

Engine (Start/Ignition) *** Flashcards

*22 Questions *

1
Q

What 2 ENG indications are displayed full time on EICAS?

A
  • N1

- EGT

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2
Q

What happens when you pull start switch w/AUTOSTART ON?

A
  • Arms the start valve

- Opens ENG bleed air valve

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3
Q

What happens when you pull start switch w/AUTOSTART OFF?

A
  • Opens start valve
  • Opens ENG bleed air valve
  • Start Light Illuminates
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4
Q

What happens at 50% N2 during ENG start?

A

Start Cutoff

  • Start valve closes
  • ENG bleed air valve closes
  • Start light extinguishes
  • Ignition discontinues

Starter cutoff!!!!!!!!!!!!

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5
Q

IGNITION – AUTO Switch in the SINGLE position?

A
  • EEC alternates igniter 1 and igniter 2 for each ground start
  • EEC selects both igniters for in-flight start or flameout
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6
Q

STBY IGNITION Selector in NORM?

A
  • AC power system supplies power to selected igniters.
  • Standby power system supplies power continuously to all igniters if AC power system is not powered.
  • 1 or 2 – standby power system supplies power continuously to the related igniter regardless of Auto ignition selector position or EEC.
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7
Q

What happens when you turn CON IGNITION turned on?

A
  • Selected igniters operate continuously

* Commands approach idle minimum

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8
Q

When is ignition selected for each engine individually?

A

• During manual start with the related start switch is out, and the fuel
control switch to RUN.
• During autostart, when commanded by the EEC.
• Nacelle anti-ice is on
• Flameout is detected

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9
Q

When is ignition selected for all engines?

A
  • Trailing edge flaps are out of the up position

* Continuous ignition switch is ON

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10
Q

What color does the EGT change to if the EGT start limit is exceeded?

A

RED

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11
Q

In flight Selected igniter(s) AUTOMATICALLY operate continuously for what conditions?

A
  • ENG start w/N2
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12
Q

X-BLD mean w/displayed next to N2 when ENG shutdown?

A
  • Crossbleed air is necessary for start
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13
Q

How many igniters for ground/air start?

A
  • One ground

- Two air

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14
Q

ENG start seq with AUTOSTART ON?

A
  • Start Switch out arms start valve
  • Start Switch out opens bleed valve
  • Fuel control switch RUN initiates start seq
  • EEC opens start valve/start light illumes
  • At N2, EEC opens fuel metering valve/energized IGN
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15
Q

3 malfunctions monitored for aborted start by EEC?

A
  • Hot Start
  • Hung Start
  • No EGT Rise
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16
Q

How does EEC protect against hot/hung start?

A
  • Cuts off fuel
  • Adjust fuel sched
  • Reapplies fuel for another attempt (Max 3 attempts)
  • fuel and ignitions cut off
  • The engine motors for 30 seconds
17
Q

How does EEC protect against no EGT rise during start?

A
  • Cuts fuel and IGN
  • ENG motors for 30 sec
  • Applies fuel + IGN (both) for another attempt (Max 3)
  • if aborting it motor the engine for 30 sec
18
Q

What EGT limit does EEC abort in-flight start during AUTOSTART?

A

The takeoff limit

19
Q

How is engine oil cooled?

A

fuel/oil heat exchanger

20
Q

How is ENG thrust reverse actuated?

A

Pneumatically actuated

21
Q

What protect aircraft from THR REV deploy in flight?

A

Bleed air applied to stow and lock the THR REV.

22
Q

What is broadband vibration and how is it displayed?

A 
AVG vibration (fan, LPT, or N2)
BB displays on secondary EICAS
23
Q

Normal power source for IGN?

A

AC PWR

24
Q

Backup power source for IGN?

A

MAIN STANDBY BUS

25
Q

Placing STBY IGNITION selector in 1 or 2 position does what?

A

Tells standby power system to supply power continuously only to that specific igniter regardless Auto Ignition selector position or EEC selection.

26
Q

How many times will EEC attempt an AUTOSTART in flight?

A

No max number. Will be done continuously until successful start is achieved.

27
Q

What parameters do we monitor during an engine start?

A
  • No N1 by idle N2
  • Non Normal OIL PRESS indication by idle N2

** GE idle N2 approx 62-67%

28
Q

When must CONT IGN be selected ON?

A
  • MOD/SVR Turb
  • MOD/HVY Rain
  • Hail/Sleet
  • Volcanic Ash
  • Contaminated RWY
29
Q

What will AUTOSTART not protect you from?

A
  • NO OIL PRESS
  • NO N1 Rotation
  • Tail Pipe Fire

Atlas Air B747 April 2022 (41 decks)

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