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ignition during icing conditions, in-flight restarts and/or when the aircraft approaches a
high angle of attack (stall).
Each engine has two independently controlled AC ignition systems. Each system (A
and B) consists of two ignition exciters and two igniter plugs. Ignition system A is
powered by the AC essential bus and ignition system B is powered from the battery bus
through a static inverter. Each system supplies electrical power to fire a dedicated
igniter in both engines. The ignition systems are automatically controlled by the FADEC
but if required, can be manually activated by selecting the CONT switchlight on the
Start/Ignition panel which will activate both ignition systems on both engines. The
engines are normally started using only one of the systems. Logic within the FADEC
causes the ignition system to alternate between A and B system on each successive
start.
During engine start, if the FADEC senses a failed ignitor it will automatically switch to
the other ignitor after a 15 second time delay and a L or R IGN A or B FAULT status
message will be posted on the EICAS status page.
NOTE
During start, if the throttle is selected to SHUT OFF or
the STOP switchlight is pressed before the 15 second
time delay has elapsed, the IGN FAULT status
message will not be posted on the EICAS.
In the event of an engine fire, each engine FIRE PUSH switchlight, on the glareshield,
supplies a command signal to the FADEC to disable both ignition systems on the
affected engine.
Vol. 1 20--30--3
POWER PLANT
Starting and Ignition Systems REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Starting and Ignition Systems --- Controls
Figure 20---30---2
L ENG and R ENG STOP
Used to stop engine start
sequence.
STOP (white) light indicates stop
is selected.
Engine Start/Ignition Panel
Overhead Panel
L ENG and R ENG START
Used to initiate engine start sequence.
START (white) light indicates start
is selected.
IGNITION CONT
Used to select
continuous ignition of
both ignitors on both
engines.
ON (white) light
indicates continuous
ignition is selected on.
Start Protection
On the ground, start protection functions are automatically provided by the FADEC to
prevent engine damage due to either hot or hung starts. In flight, the start protection
functions are inhibited to allow in-flight emergency engine starts.
Vol. 1 20--30--4
POWER PLANT
Starting and Ignition Systems REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Primary Page ITT Readout Scale and Pointer <1001>
Figure 20---30---3
ITT Readout, scale and
pointer (green)
Indicates temperature of
engine exhaust gasses ( C).
Readout and pointer turn red
when ITT limit is exceeded.
HOT (Icon) (red)
Displayed durind a hot start.
Primary Page
BRT
Vol. 1 20--30--5
POWER PLANT
Starting and Ignition Systems REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
L or R Start Abort and Ignition EICAS Messages <1001>
Figure 20---30---4
L START ABORT
R START ABORT
L START VALVE
R START VALVE
NO STRTR CUTOUT
L or R ENGINE START status (white)
Indicates that engine start has been
selected.
L or R START ABORT caution (amber)
Indicates a FADEC aborted start or
an aborted start due to a hot or hung
start (on ground only).
NO STRTR CUTOUT caution (amber)
Indicates that starter valve is not
closed with engine running.
L or R START VALVE caution (amber)
Indicates that respective starter valve
did not open when commanded.
L or R IGN A or B FAULT status (white)
Indicates a fault in the respective ignition
driver.
CONT IGNITION status (white)
Indicates that all ignitors have
been selected on.
L or R AUTO IGNITION advisory (green)
Indicates that FADEC has selected
ignition on. L AUTO IGNITION
R AUTO IGNITION
CONT IGNITION
L IGNAFAULT
R IGNAFAULT
L IGN B FAULT
R IGN B FAULT
L ENGINE START
R ENGINE START
BRT
Status Page
Primary Page
Vol. 1 20--30--6
POWER PLANT
Starting and Ignition Systems REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
C. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Starting Control Valves
ENG START L BATTERY
M5
ENG START R
BUS
1
M4
Ignition Igniters
ENG IGN A AC
ESSENTIAL
U7
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