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

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.
Control and Indication
A three-position switch (Figure 7-20) with
p o s i t i o n s l a b e l e d "A R M ," " O F F," a n d
"TEST/RESET" is located on the APR control
panel. When this switch is at the ARM posi-
tion, the system is armed provided that three
conditions exist:
1. Both engine speed control switches on
2. Both engines above 79% N
3. No faults sensed by the integral mon-
itoring system
Selecting the APR switch off deactivates
the system. The TEST/RESET position is
spring-loaded to the off position and is used
for testing.
A split legend green light labeled "L.ON" and
"R. ON" will illuminate following an APR
trigger (activating) to confirm proper response
(N increase) on the serviceable engine.
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CL-600-2B16 PILOT TRAINING MANUAL
1
A green light labeled "READY" forms the
upper part of a dual legend light which illu-
minates to confirm APR readiness above 79%
N
trigger occurs, the READY light will extin-
guish as the L. ON or R. ON light illuminates.
An amber APR light and MASTER CAUTION
lights will illuminate as a crew warning that
either (1) the APR system is not armed for
takeoff or (2) that the APR system has failed
for one or more of the following reasons:
1
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
Figure 7-20. APR Control Panel
if the system is armed. If a subsequent APR
1
• Either the static or dynamic test is not valid.
• The serviceable engine's response to an
APR trigger produces less than 2% N
rpm increase within 2 seconds.
• The ECU input voltages are outside ac-
ceptable limits.
• The monitoring system detects failure
of the microcomputer or the two inter-
nal power supplies.
• Either or both N
1
of limits.
• Battery input voltage fails.
• The two WOW inputs disagree.
• A unwarranted APR command is triggered.
Lt é e
Lt d.
1
input signals are out
CL 601-3R 7-21