7-22
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
under normal conditions, the APR control unit
electrically trims down the settings to the
lower normal ratings. When the APR is trig-
gered the control unit allows the computers to
reset to the APR ratings; normal engine re-
sponse to the throttle movement is retained.
Override Mode
When armed, to cater for an auto mode mal-
function, the system may also be triggered by
manual selection of APR override (O/RIDE).
NOTE
There is a penalty in terms of en-
gine life whenever an engine oper-
ates at APR levels—see the
Aircraft
Maintenance Schedule
for further
details. Therefore override selection
of APR should only be made when
it is essential to do so.
To cancel APR mode after override selection,
b o t h t h e A P R O / R I D E a n d A P R A R M
switches should be delatched. If only the APR
ARM switch is delatched, APR will be can-
celled, but will be triggered again as soon as
the APR ARM switch is pressed again.
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
APR O/RIDE
APR ARM
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
APR
ARMED
Figure 7-19. APR—Armed
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