Engine Speed Control And Apr Systems - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

Airstarts
Airstarts are divided into starter-assisted and
windmilling airstarts.
Starter-assisted Airstarts
The procedure for starter-assisted airstarts
(cross bleed starts) are identical with those ex-
plained previously for cross bleed starts.
All in-flight starts must be performed within
the airstart envelope (Figure 7-19).
The thrust lever should not be moved to IDLE
during airstarts unless ITT is less than 90°C.
Windmilling Airstart
Windmilling airstarts are obtained at the fol-
lowing airspeeds:
Below 10,000 feet......................... 300 KIAS
10,000 to 21,000 feet ..... 300 KIAS to V
N must be stable or increasing.
2
AIRSTART ALTITUDE LIMIT
21
10
0
0 12 13
Figure 7-19. Airstart Envelope
WARNING
Airstarts, windmilling or starter-
assisted, should not be attempted if
the flameout or shutdown is ac-
c o m p a n i e d b y u n u s u a l n o i s e o r
other indications that mechanical
damage may exist.
MO
WINDMILL START
10,000–21,000 FT
STARTER ASSIST
BELOW 21,000 FT
WINDMILL START
BELOW 10,000 FT
N % RPM
2
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
Prior to initiating a windmilling airstart, all
checklist items affecting the start must be
completed. Then push the appropriate IN
FLighT START switchlight. The green light
and the IGN A and B ON lights will illuminate.
Advance the thrust lever to IDLE and moni-
tor all engine-related instruments until the en-
gine is stabilized. Then push the IN FLighT
START switchlight again. The green light and
the IGN A and B ON lights will extinguish,
then complete the After Start checklist.
ENGINE SPEED CONTROL
AND APR SYSTEMS
General
The automatic performance reserve (APR) is
a solid-state system which constantly moni-
tors the thrust of both engines during takeoff.
If significant power loss occurs in either en-
gine, it will instantaneously command an N
(thrust) increase.
Components
The APR system components include an APR
control panel (Figure 7-20), an APR controller,
and an N speed selector switch for each en-
1
gine. In addition, the APR system utilizes the
torque motors (discussed earlier in Engine
Fuel System) and the amplifiers (ECUs) as-
sociated with the FCUs.
55
Figure 7-20. APR Control Panel
L t ée
L t d.
1
CL 601-3A 7-21