Engine (Start/Ignition) *** Flashcards
*22 Questions *
What 2 ENG indications are displayed full time on EICAS?
- N1
- EGT
What happens when you pull start switch w/AUTOSTART ON?
- Arms the start valve
- Opens ENG bleed air valve
What happens when you pull start switch w/AUTOSTART OFF?
- Opens start valve
- Opens ENG bleed air valve
- Start Light Illuminates
What happens at 50% N2 during ENG start?
Start Cutoff
- Start valve closes
- ENG bleed air valve closes
- Start light extinguishes
- Ignition discontinues
Starter cutoff!!!!!!!!!!!!
IGNITION – AUTO Switch in the SINGLE position?
- EEC alternates igniter 1 and igniter 2 for each ground start
- EEC selects both igniters for in-flight start or flameout
STBY IGNITION Selector in NORM?
- 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.
What happens when you turn CON IGNITION turned on?
- Selected igniters operate continuously
* Commands approach idle minimum
When is ignition selected for each engine individually?
• 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
When is ignition selected for all engines?
- Trailing edge flaps are out of the up position
* Continuous ignition switch is ON
What color does the EGT change to if the EGT start limit is exceeded?
RED
In flight Selected igniter(s) AUTOMATICALLY operate continuously for what conditions?
- ENG start w/N2
X-BLD mean w/displayed next to N2 when ENG shutdown?
- Crossbleed air is necessary for start
How many igniters for ground/air start?
- One ground
- Two air
ENG start seq with AUTOSTART ON?
- 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
3 malfunctions monitored for aborted start by EEC?
- Hot Start
- Hung Start
- No EGT Rise
How does EEC protect against hot/hung start?
- 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
How does EEC protect against no EGT rise during start?
- 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
What EGT limit does EEC abort in-flight start during AUTOSTART?
The takeoff limit
How is engine oil cooled?
fuel/oil heat exchanger
How is ENG thrust reverse actuated?
Pneumatically actuated
What protect aircraft from THR REV deploy in flight?
Bleed air applied to stow and lock the THR REV.
What is broadband vibration and how is it displayed?
AVG vibration (fan, LPT, or N2) BB displays on secondary EICAS
Normal power source for IGN?
AC PWR
Backup power source for IGN?
MAIN STANDBY BUS
Placing STBY IGNITION selector in 1 or 2 position does what?
Tells standby power system to supply power continuously only to that specific igniter regardless Auto Ignition selector position or EEC selection.
How many times will EEC attempt an AUTOSTART in flight?
No max number. Will be done continuously until successful start is achieved.
What parameters do we monitor during an engine start?
- No N1 by idle N2
- Non Normal OIL PRESS indication by idle N2
** GE idle N2 approx 62-67%
When must CONT IGN be selected ON?
- MOD/SVR Turb
- MOD/HVY Rain
- Hail/Sleet
- Volcanic Ash
- Contaminated RWY
What will AUTOSTART not protect you from?
- NO OIL PRESS
- NO N1 Rotation
- Tail Pipe Fire
