7-21
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
The O/RIDE switch has an APR green an-
nunciator which will become lit when the sys-
t e m i s a r m e d a n d t r i g g e r e d , e i t h e r
automatically by N
2
difference or manually by
pressing and latching the O/RIDE switch.
OPERATION
See Figures 7-18 through 7-20.
When armed, APR is triggered automatically
if the engine N
2
signals (received from the
synchronizer and compared by the APR con-
troller), differ by more than 5% N
2
.
Increase in thrust is obtained by allowing the
engines to be run at higher operating limits; the
N
2
rotor speed increasing approximately 0.75%
(max) and the interstage turbine temperature
(ITT) rising approximately 18° C (max).
Automatic Mode
In auto mode the system functions in con-
junction with the engine synchronizer system.
When armed, APR will be triggered auto-
matically if the engine N
2
speed signals re-
ceived from the synchronizer and compared by
the APR control unit differ by more than 5%
N
2
(approximately 12% N
1
).
Both engine fuel computers limit maximum
takeoff power to the APR rating although
5% DETECTOR
5% DETECTOR
SPEED TRIM
TEMP TRIM
SPEED TRIM
TEMP TRIM
LEFT ENG
COMPUTER
RIGHT ENG
COMPUTER
POWER SUPPLY
NO. 1
DIGITAL
COMPARATOR
POWER SUPPLY
NO. 2
SYNCHRONIZER
NETWORK
POWER SUPPLY
{
{
LEFT ENGINE
RIGHT ENGINE
ENG SYNC
N
1
OFF
N
2
N
2
N
2
N
1
N
1
SYNCHRONIZER
APR CONTROL
NO. 2 SLAVE
SIGNALS FROM
COMPUTER MANUAL
MODE SOLENOIDS
TO RIGHT
ENG TRIM
28 VDC
APR O/RIDE
APR ARM
APR
APR
ARMED
Figure 7-18. APR—OFF SYNC—N
2
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