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B747 > Engines > Flashcards

Engines Flashcards

1
Q

Which two engine indications are displayed full time on the EICAS?

A

N1 & EGT

FCOM 2 7.10.1

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2
Q

State the sequence of events that occur when you pull a start switch with the AUTOSTART switch ON

A

It arms the start valve and opens the engine bleed air valve.

FCOM 2 7.20.6

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3
Q

State the sequence of events that occur when you pull a start switch with the AUTOSTART switch OFF

A

It opens the start and engine bleed air valves only.

FCOM 2 7.20.8

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4
Q

Which two valves close at 50% N2 RPM during engine start?

A

The start and engine bleed air valves close at 50% N2

FCOM 2 7.20.6

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5
Q

What is the function of the AUTO ignition selectors in the SINGLE position?

A

Only one igniter will be energised per engine during start on the ground, it alternates automatically between igniters on successive starts.

FCOM 2 7.13.15

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6
Q

What is the function of Standby (STBY) IGNITION selector in NORM?

A

AC power system supplies power to selected igniters backed up by the standby power system to both igniters if AC power is lost.

FCOM 2 7.13.4 / 7.20.8

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7
Q

What happens when you turn the continuous (CON) IGNITION switch ON?

A

The selected igniters operate continuously

It commands approach idle minimum

FCOM 2 7.13.4

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8
Q

When is ignition selected for each engine individual?

A

When the start switch is out
Nacelle anti ice is on
A flameout is detected.

FCOM 2 7.20.8

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9
Q

When is ignition selected for all engines?

A

When trailing edge flaps are out of the up position or CONT IGN switch is ON

FCOM 2 7.20.8

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10
Q

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

A

Red

FCOM 2 7.10.8

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11
Q

What does “X-BLD” mean when displayed next to the N2 indication when an engine is shut down?

A

X-BLD displays next to N2 if crossbleed air is necessary for start

FCOM 2 7.20.6

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12
Q

How many igniters are selected for ground start, and how many for inflight start?

A

One for ground start, two for inflight start

FCOM 2 7.20.6

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13
Q

Describe the engine start sequence with the AUTOSTART switch ON

A

The EEC opens the start valve and the start light illuminates
At a predetermined N2, the EEC opens the fuel metering valve and energises the selected igniter.
Starter cutout occurs at 50% N2
At cutout, the start switch is released to the in position
The start and bleed air valves close
The start light extinguishes
Ignition discontinues

FCOM 2 7.20.7

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14
Q

During an engine start, the AUTOSTART system can abort the start for which three malfunctions?

A

Hung start
Hot start
No EGT rise

FCOM 2 7.20.7

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15
Q

Which two parameters does the AUTOSTART system not monitor?

A

Oil pressure & N1 rotation

FCOM 2 7.20.7

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16
Q

How does the EEC protect against an impending hot start, hung start, or no EGT rise?

A

It cuts off fuel, adjusts the fuel schedule, then reapplies fuel for another attempt.

The EEC makes 3 attempts before aborting. The engine will motor for another 30 seconds after fuel and ignition are cut off.

FCOM 2 7.20.7

17
Q

At what EGT limit does the EEC abort an inflight start through the AUTOSTART system?

A

Red line?

18
Q

How is the engine cooled?

A

By the engine oil system.

Oil is cooled in the fuel/oil heat exchanger

FCOM 2 7.20.12

19
Q

How is the engine thrust reverser actuated?

A

Pneumatically from its own engine bleed source.

FCOM 2 7.20.15

20
Q

What protects the thrust reversers from deploying inadvertently in flight?

A

Thrust reversers are protected against deploying inadvertently. If a reverser unlocks and deploys inadvertently, the reverser system applies bleed air to stow and lock the reverser.

FCOM 2 7.20.15

21
Q

What is broadband vibration in the airborne vibration monitoring system, and how is it displayed?

A

It is vibration whose source cannot be otherwise determined, it is displayed next to the BB indication and is the average vibration detected.

FCOM 2 7.20.16

B747 (7 decks)

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