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anomalies. After completion of the manual start sequence, the crew select IGNITION to Normal
and may then return the START SELECT switch to AUTO.
Engine Shut Down
The normal engine shut down sequence is as follows:
· Place thrust lever in IDLE position.
GF1810_090
THRUST
REV
MAX
MAX REV
IDLE
· Place ENGINE RUN switch to the OFF position, when engine has stabilized at Idle.
GF1810_091
L ENG SHUTDOWN
ENGINE
L RUN R
OFF OFF
The EEC will reset (in preparation for the next engine start) after ENGINE RUN switch has been
selected to OFF.
POWER PLANT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
18−10−61
STARTING AND IGNITION (CONT'D)
Dry Cranking
Dry cranking of the engine is accomplished as follows:
· Ensure ENGINE RUN switch is selected to OFF.
· Ensure IGNITION switch is Normal (the EEC will inhibit IGNITION when CRANK is selected,
unless IGNITION has been selected to ON).
· Select START SELECTOR to L CRANK or R CRANK.
GF1810_092
ENGINE
L RUN R
OFF OFF
ENGINE
IGNITION L CRANK L CRANK
AUTO
ENG START
The EEC will open the SAV and activate the starter motor (if N2 below starter reengagement
speed). The EEC will keep the starter motor operating as long as the N2 is below starter
disengagement speed (approximately 45% N2), for 3 minutes maximum.
The crew can stop cranking by selecting START SELECTOR to AUTO.
Wet Cranking
Wet cranking is normally performed by maintenance personnel.
Wet cranking of the engine is accomplished as follows:
· Ensure IGNITION switch is Normal (the EEC will inhibit IGNITION when CRANK is selected,
unless IGNITION has been selected to ON).
· Select START SELECTOR to L CRANK or R CRANK.
· Select ENGINE RUN switch to ON (HPSOV opens allowing fuel to the engine burners).
GF1810_093
ENGINE
L RUN R
OFF OFF
ENGINE
IGNITION L CRANK L CRANK
AUTO
ENG START
The EEC will open the SAV and activate the starter motor (if N2 below starter reengagement
speed). The EEC will keep the starter motor operating as long as the N2 is below starter
disengagement speed (approximately 45% N2), for 3 minutes maximum.
POWER PLANT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
18−10−62
STARTING AND IGNITION (CONT'D)
Starting Anomalies
Automatic Ground Start Abort
Any of the following events will result in an automatic ground start abort:
· Crew selecting ENGINE RUN switch to OFF.
· N2 speed not greater than or equal to 15% (120 seconds from ENGINE RUN switch ON).
· Idle speed not achieved (120 seconds from HPSOV open).
· Starter cutout not being reached within starter duty timer (180 seconds from SAV open).
· ITT exceeding the ground start limit (700°C) after lightoff
and during acceleration to Idle.
Manual Ground Start Abort
Any of the following events will result in a manual ground start abort:
· Crew selecting ENGINE RUN switch to OFF.
· Crew selecting the START SELECTOR switch to AUTO.
· Crew selecting the IGNITION switch to Normal.
Automatic Air Start Abort
Any of the following events will result in an automatic air start abort:
· Crew selecting ENGINE RUN switch to OFF.
· N2 speed not greater than or equal to 8% (60 seconds from ENGINE RUN switch ON).
· Idle speed not achieved (600 seconds from HPSOV open).
· Starter cutout not being reached within inflight starter duty timer (180 seconds from SAV
open).
POWER PLANT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
18−10−63
STARTING AND IGNITION (CONT'D)
AutoRelight
The EEC provides an AutoRelight
function to detect and recover an engine flameout.
The AutoRelight
function is enabled when the engine is at or above Idle and the ENGINE RUN
switch is ON.
Two methods are used to detect a flameout at all engine speeds at or above Idle:
· By monitoring the rate of change of N2. The threshold for the rate of change is calculated as
a function of HP compressor pressure exit (P30) and altitude. A flameout is assumed to
have occurred if N2 decelerates at a rate greater than this threshold.
· By monitoring the difference between commanded Idle N2 and actual N2. If the difference is
greater than a preset threshold, a flameout is assumed to have occurred. This method is
suppressed for 15 seconds, following a transition from low idle to high idle.
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