Engine Starting - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

The analog scales are calibrated in pounds of
fuel per hour from 0 to 4,000. The digital dis-
plays are in pounds per hours times 10.

ENGINE STARTING

General
Engine starting is divided into ground starts,
starter-assisted airstarts, and windmilling airstarts.
Starter
The engine starter is an electrically controlled
air turbine starter (ATS). Starter output is ap-
plied through a clutch to the accessory gear
which, in turn, rotates the HP spool.
A speed sensor operated by the ATS governor
automatically terminates the starter cycle at ap-
proximately 55% N
2
cycle is less than 40 seconds. A time-delay relay
is armed when a start cycle is initiated, and, if
the ATS operation continues for more than 60
seconds, the time-delay relay will open an illu-
minate the amber STOP switchlight on the start
and ignition control panel (Figure 7-8). The
STOP switchlight may be pushed to terminate
the start sequence at any time below 55% N
ATS Air Sources
The air source for ATS operation can be (1)
APU bleed air, (2) an external air source, or
(3) cross bleed from an operating engine. The
minimum air pressure for starting is 45 psi.
(See Chapter 9, "Pneumatics.")
Ground Start (APU Air)
WARNING
Engine starting should not be attempted
until the Walkaround checklist and the
Cockpit checklist are completed.
To initiate a ground start using APU bleed air,
push the APU bleed-air switchlight (Figure 7-
13). The OPEN light will illuminate, and the left
scale of the bleed-air pressure indicator (Figure
rpm. The average start
rpm.
2
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
7-14) should show approximately 50 psi. Push
IGN A or IGN B switchlight (Figure 7-8) to
arm an ignition system, and check that the ap-
plicable green light illuminates.
Push and hold the appropriate START switch-
light for 2 seconds. The green START light will
illuminate as will the ON light in the selected
ignition switchlight. The ISOLation valve OPEN
light will also illuminate. The left and right en-
gine BLEED CLOSED lights will extinguish.
Verify engine rotation on the N
and monitor N until it reaches 20% minimum
2
and ITT below 120° C. Then move the affected
thrust lever to IDLE, check the ITT indicator for
light-off, and continue to monitor ITT, oil pres-
sure, and N rpm. Also check that N
2
creasing in relation to N
55% N rpm, the START light and the IGNition
2
ON light (Figure 7-8) will both extinguish as
should the ISOLation valve OPEN light. The left
and right engine BLEED CLOSED lights
(Figure 7-14) should both illuminate. Continue
to monitor all engine-related instruments until
the engine stabilizes at idle rpm (approximately
60–64% N ). The N
2
at idle should be within 2%.
The idle N rpm of CF34 engines au-
2
tomatically varies as a function of
compressor inlet temperature (T
In case of faulty T
FLOOR STOP is provided to prevent
N from decreasing below 56.9%.
2
L 14TH STAGE
PUSH
BLEED
ON/
CLOSED CLOSED
OFF
DUCT
FAIL
DUCT MON CKPT HEAT
LOOP A
BOTH
LOOP B
10TH STAGE
BLEED
CLOSED
OPEN
DUCT
FAIL
L ISOL
Figure 7-14. Bleed-Air Control Panel
rpm indicator
2
rpm is in-
1
. At approximately
2
variation between engines
2
NOTE
C).
2
C input, an IDLE
2
R 10TH STG
BLEED
BLEED
DUCT
AIR
100 100
FAIL
50 50
STBY
0 0
PSI
OFF
L R
NORM
PUSH
ON/
BLEED
OFF OFF OFF
CLOSED
DUCT
FAIL FAIL
FAIL
R L ACU R
CL 601-3A 7-17
L t ée
L t d.
B
A
L
I
E
R
E
D