ENGINE Flashcards
What two engine indications are displayed full time on the EICAS?
- N1
- EGTFCOM, VOL 2; 7.10.1
State the sequence of events that occur when you pull a start switch with the AUTOSTART Switch ON?
- Arms the start valve
- Opens engine bleed air valve.FCOM, VOL 2; 7.13.4
State the sequence of events that occur when you pull a start switch with the AUTOSTART Switch OFF.
- Opens start valve
- Opens engine bleed air valve.FCOM, VOL 2; 7.13.4
What two valves close at 50% N2 RPM during engine start?
- Start valve
- Engine bleed air valve.FCOM, VOL 2; 7.13.4
What is the function of the AUTO Ignition Selector in the SINGLE position?
- The EEC alternates igniter 1 and igniter 2 for each ground start.
- The EEC selects both igniters for in-flight start or flameout.FCOM, VOL 2; 7.13.5
What is the function of the Standby (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 or EEC
FCOM, VOL 2; 7.13.4/7.20.8.
What happens when you turn the Continuous (CON) IGNITION Switch ON?
- Selected igniters operate continuously
- Commands approach idle minimum.FCOM, VOL 2; 7.13.4
When is ignition selected for each engine individually?
- Related start switch is out, or
- Nacelle anti-ice is on, or
- Flameout is detectedFCOM, VOL 2; 7.20.8
When is ignition selected for all engines?
- Trailing edge flaps are out of the up position
- Continuous ignition switch is ON.FCOM, VOL 2; 7.20.8
What color does the EGT change to if the EGT start limit is exceeded?
• Red
FCOM, VOL 2; 7.20.6
What does “X-BLD” mean when displayed next to the N2 indication when an engine is shut down?
• The current flight level for engine start envelope is greater than
the maximum start altitude.(Windmilling start)
• Crossbleed air is recommended for in- flight start.
FCOM, VOL 2; 7.20.6/7.11.6
How many igniters are selected for ground start, and how many for inflight start?
- One igniter for ground start.
- Two for inflight start.FCOM, VOL 2; 7.20.6
With the AUTOSTART Switch ON, describe the engine start sequence?
• Pulling the start switch out arms the start valve,and
opens the engine bleed valve.
• Moving the fuel control switch to run initiates the start
sequence.
• 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, and the start switch is released
to the in position.
• Start/Engine bleed valves close.
• Start light extinguishes and the ignition is discontinued.
FCOM VOL 2 7.20.6
What three malfunctions are monitored and results in an aborted start by the EEC?
- Hot start
- Hung start
- No EGT riseFCOM, VOL 2; 7.20.7
How does the EEC protect against an impending hot start, hung start, or no EGT rise?
• With an EGT rise but the EEC detects an impending hot or hung start
before starter cutout, it cuts off fuel, adjusts the fuel schedule,
and then reapplies fuel for another attempt. It makes 3 attempts before
aborting the autostart sequence. Fuel and ignition are cut off. The engine
motors for 30 seconds before the start and bleed air valves close.
• For no EGT rise, it cuts fuel and ignition. The engine motors for 30 seconds.
The EEC applies fuel and ignition to both igniters for another attempt.
It makes 3 attempts before aborting the autostart sequence.
(Same motoring as above)
FCOM, VOL 2; 7.20.7
