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At starter cutout speed, the SAV is closed, the turbine loses speed and this disengages the sprag clutch.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
Air Turbine Starter (ATS) (Cont’d)
The START message is displayed on EICAS and on the BLEED/ANTI-ICE synoptic page.
START
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 28VDC 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.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
Ignition System (Cont’d)
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 arm the igniter unit for start and energize the igniter unit on the operating engine. Crew selection of ignition is not time limited, but will reduce overall igniter life.
IGNITION Select Switch
Used to select all 4 igniters
(2 per engine).
Normal (dark) . Default
mode of operation. The EEC
controls ignition.
ON (illuminated) . Indicates
that the switch has been
selected ON and igniters are
firing continuously.
Used to start both engines. AUTO . Selects automatic starts for either engine
L.R CRANK . Initiates rotation of the left or right engine for dry or wet cranking or manual start.
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.
GF1810_078 GF1810_077
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) interfaces with both EEC and the HP Fuel Shut-Off (HPSOV) to:
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