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R
LP LP
HP HP
Starter
Air Valve
For Training Purposes Only
Sept 04
17-39
P I LOT T R A I N I N G GU I D E
POWER PLANT
The START message is displayed on EICAS and on the BLEED/ANTI-ICE synoptic
page.
IGNITION SYSTEM
The ignition system ignites the fuel/air mixture in the combustion chamber, as
commanded by either of the two channels of the EEC, during the start sequence and to
maintain combustion during critical phases of flight (stall).
The ignition system comprises two exciter boxes, two igniter leads and two igniter
plugs. Power is supplied from 28 VDC and is controlled from channel A or B in the
EEC.
For consecutive ground start attempts the EEC alternates channels and igniters as
follows:
• EEC channel A Igniter 1
• EEC channel B Igniter 1
• EEC channel A Igniter 2
• EEC channel B Igniter 2
The above only applies if there are no failures within the FADEC, which prevents
alternate selection.
In the event that the ground start (AUTO) has been aborted, the EEC will
automatically select the other igniter on the following ground start.
During air starts (AUTO), the EEC will select both igniter channels.
During manual ground and air starts, the EEC will select both igniters, as commanded
by the IGNITION switch.
TOTAL FUEL (LBS) 4155O
146OO 1OOOO 146OO
N2
FF (PPH)
OIL TEMP
OIL PRESS
93.4
575O
115
81
START START
ND
STAB
ITT
SYNC
–TRIMS–
NL RUDDER NR
AIL
LWD RWD
7.2
NU
1O.2
O
2O
O
235O
2O 789
GX_17_057
APU
L
OFF
45
PSI
45
PSI
R
OFF
LP
HP
LP
HP
START
START
Annunciation
START
Annunciation
Aft tank not shown
on Global 5000
17-40 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
The crew can manually select the ignition system energized continuously on the
ENGINE panel, located on the overhead panel. Upon selection of the ignition switch,
the EEC will energize the igniter unit, on an operating engine. Crew selection of
ignition is not time limited, but will reduce overall igniter life.
NOTE
There is a timed out limit (30 seconds), for igniter operation on
the ground (with engines not operating), for maintenance
purposes.
An EICAS message is displayed when IGNITION is selected ON.
ENGINE
ENG START
IGNITION
ON
AUTO
L CRANK R CRANK
GX_17_058
IGNITION Select Switch
Normal
ON
Used to select all 4 igniters
(2 per engine).
(dark) - Default
mode of operation. The EEC
controls ignition.
(illuminated) - Indicates
that the switch has been
selected ON and igniters are
firing continuously.
ENGINE START Selector
AUTO
L-R CRANK
Used to start both engines.
- Selects automatic
starts for either engine.
- Initiates
rotation of the left or right
engine for dry or wet cranking
or manual start.
L-R IGNITION ON
GX_17_059
For Training Purposes Only
Sept 04
17-41
P I LOT T R A I N I N G GU I D E
POWER PLANT
ENGINE RUN SWITCHES
The ENGINE RUN switch(es), when selected by the crew to either the ON or OFF
position, will inhibit or allow the EEC to control the engine. The switch(es)
interface(s) with both EEC and the HP Shut Off Valve (HPSOV) to:
• Manually control closing and opening of the HPSOV
• Indicate to the EEC the Engine Run switch position and perform a dual channel
reset and to close the HPSOV in the Fuel Management Unit (FMU)
The Engine Run switch controls the respective HPSOV. The switch in the ON position
enables the HPSOV open and the switch in the OFF position enables the HPSOV
closed.
The Engine Run switch in the ON position gives EEC authority to open HPSOV
during an automatic ground or air start. When the switch is set to the OFF position, the
HPSOV will close.
The Engine Run switch in the ON position will directly command the EEC to open the
HPSOV during a manual ground or air start. When the switch is set to the OFF
position, the HPSOV will close.
The EEC will override an Engine Run Switch ON command by closing the HPSOV
only for an automatic start abort or relight abort, or in the case of an overspeed.
The transition ON to OFF initiates a reset of both lanes of the EEC of the associated
engine and will also send a signal to command the starter air valve to close.
　
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