BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 208

d. APR
e. Test (will remain on as long as TEST
is held)
4. If any faults are detected , the amber
APR light will illuminate.
Dynamic Test
The dynamic test is done just prior to flight. It is
automatically performed for both engines by the
APR controller and verifies that the APR system
is operational. To perform the test, the APR
switch is armed. Advance both thrust levers to
obtain an indicated N
READY light came on at 79% N
controller samples the fan rpm continuously to
determine if they are stable; that is, fan rpm does
not vary more than a predetermined amount. The
dynamic test initiates an APR trigger to both
APR amplifiers which causes both engines to
accelerate slightly. If the test is valid, the TEST
light will momentarily flash. If outside the
permissible limit, the amber APR light will
illuminate, accompanied by the MASTER
CAUTION light.
Operation
Before takeoff, the static and dynamic tests are
performed and determined as valid, both en-
gine speed control switches are on, and the
APR switch is at ARM. The green READY
light will illuminate after 79% N
APR light and the green L. ON and R. ON
lights and the TEST light are extinguished.
Figure 7-21 illustrates an APR trigger. Both
fuel control amplifiers (FCUs) are receiving N
N , T , and power lever angle (PLA). The right
2 2
engine N1 has decreased below N
trol (79% N ) and has reached the APR "trig-
1
ger" speed (approximately 68% N
controller sends a signal to both amplifiers to
increase N . The left engine responds since it
1
above 83% (note the
1
). The APR
1
. The amber
1
speed con-
1
). The APR
1
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CL-600-2B16 PILOT TRAINING MANUAL
is still on N speed control (above 79% N
1
illuminates the green L. ON legend when it has
increased the required amount (approximately
2% N ). The right engine does not respond
1
since it is not on N
,
1
1
speed control.
1
CL 601-3A 7-23
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L t d.
) and