ENGINE

Question 1

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

Answer 1

N1, EGT

Question 2

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

Answer 2

Pulling start switch out arms the start valve and opens the engine bleed air valve. Moving fuel control switch to RUN initiates start; EEC opens start valve- start light illuminates. Predetermined N2 EEC opens fuel metering valve and energies the selected igniter (one on ground/ two in air). Starter cutout at 50% N2

Question 3

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

Answer 3

Pulling the starter switch out opens the start and engine bleed air valves, start light illuminates. When N2 reaches fuel on indicactor the fuel control switch is moved to RUN- the spar, fuel metering and engine fuel valves open and selected ignitor energizes. Started cutout occurs at 50% N2.

Question 4

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

Answer 4

Start and Engine bleed air valves.

Question 5

What is the function of the AUTO Ignition Selector in the SINGLE position?

Answer 5

EEC alternates igniter 1 or 2 on each ground start.
Selected igniters operate during start with N2<50%, Trailing edge flaps out of up.
NAI on.
Engine flameout.

Question 6

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

Answer 6

AC power system supplies power to selected igniters. Standby power system supplied power continuously to all igniters if AC power system not powered.

Question 7

What happens when you turn the Continuous (CON) IGNITION Switch ON?

Answer 7

Selected ignitors operate continuously, commands approach min idle.

Question 8

When is ignition selected for each engine individual?

Answer 8

During start N2<50%, NAI on, engine flameout

Question 9

When is ignition selected for all engines?

Answer 9

trailing edge out of up, Continuous ignition switch on

Question 10

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

Answer 10

Red

Question 11

What does “X-BLD” mean when displayed next to the N1 indication when an engine is shut down?

Answer 11

Xbleed air start required

Question 12

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

Answer 12

One/two.

Question 13

Describe the engine start sequence with the AUTOSTART Switch is ON

Answer 13

Pulling start switch out arms the start valve and opens the engine bleed air valve. Moving fuel control switch to RUN initiates start; EEC opens start valve- start light illuminates. Predetermined N2 EEC opens fuel metering valve and energies the selected igniter (one on ground/ two in air). Starter cutout at 50% N2

Question 14

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

Answer 14

Hung start, hot start, no EGT rise

Question 15

Which two parameters does the autostart system not monitor?

Answer 15

Oil pressure or N1 rotation.

Question 16

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

Answer 16

If the EEC detects no EGT rise it cuts off fuel and ignition. Engine motors for 30 seconds. EEC tries again, both ignitors. EEC makes three attempts before aborting start sequence. If theres an EGT rise but EEC detects impending hot/hung start before starter cutout is cuts off the fuel, adjusts the fuel schedule, then reapplies fuel. Makes three attempts before aborting autostart sequence. In all scenarios engine motors for 30 seconds before start and bleed valve close.

Question 17

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

Answer 17

Take off limit.

Question 18

How is the engine cooled?

Answer 18

Oil system.

Question 19

How is the engine thrust reverser actuated?

Answer 19

Pneumatically.

Question 20

What protects the thrust reversers from deploying inadvertently in flight?

Answer 20

Interlock to prevent simultaneous movement of Forward and reverse levers.

Question 21

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

Answer 21

Average vibration detected. BB.