Engine Start/Ignition

Question 1

What 2 ENG indications are displayed full time on EICAS?

Answer 1

N1 and EGT

Question 2

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

Answer 2

• Arms the start valve

- Opens ENG bleed air valve

Question 3

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

Answer 3

• Opens start valve
• Opens ENG bleed air valve
• Start Light Illumes

Question 4

What happens at 50% N2 during ENG start?

Answer 4

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

Question 5

IGNITION – AUTO Switch in the SINGLE position?

Answer 5

• EEC alternates after every 2nd ground start
• BUT -
• EEC still selects both for in-flight start/flameout

Question 6

STBY IGNITION Selector in NORM?

Answer 6

AC PWR system supplies power to igniter(s) selected with the AUTO IGNITION selector. If AC system is not powered, the STBY PWR SYS supplies power continuously to both ignitors.

Question 7

What happens when CON IGNITION turned on?

Answer 7

• Selected IGN operates continuously

- Command approach idle minimum

Question 8

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

Answer 8

• ENG start w/N2

Question 9

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

Answer 9

• Current flight level for ENG start envelope exceeded

- Crossbleed air is necessary for start

Question 10

How many igniters for ground/air start?

Answer 10

• One ground

- Two air

Question 11

ENG start seq with AUTOSTART ON?

Answer 11

• SS out arms start valve
• SS 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

Question 12

3 malfunctions monitored for aborted start by EEC?

Answer 12

• Hot Start
• Hung Start
• No EGT Rise

Question 13

How does EEC protect against hot/hung start?

Answer 13

• Cuts off fuel
• Adjust fuel sched
• Reapplies fuel for another attempt (Max 3)

Question 14

How does EEC protect against no EGT rise during start?

Answer 14

• Cuts fuel and IGN
• ENG motors for 30 sec
• Applies fuel + IGN for another attempt (Max 3)

Question 15

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

Answer 15

The takeoff limit

Question 16

How is engine oil cooled?

Answer 16

fuel/oil heat exchanger

Question 17

How is ENG thrust reverse actuated?

Answer 17

Pneumatically actuated fan air

Question 18

What protect aircraft from THR REV deploy in flight?

Answer 18

Bleed air applied to stow and lock the THR REV.

Question 19

What is broadband vibration and how is it displayed?

Answer 19

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

Question 20

Normal power source for IGN?

Answer 20

AC PWR

Question 21

Backup power source for IGN?

Answer 21

MAIN STANDBY BUS

Question 22

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

Answer 22

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

Question 23

How many times will EEC attempt an AUTOSTART in flight?

Answer 23

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

Question 24

What parameters do we monitor during an engine start?

Answer 24

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

** GE idle N2 approx 62-65%

Question 25

When must CONT IGN be selected ON?

Answer 25

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

Question 26

What will AUTOSTART not protect you from?

Answer 26

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