Hawker 800 XP, Pilot Training Manual

Page: 364 / 504

Warning System
A warning horn sounds if the landing gear is
not down and locked and either of the fol-
lowing conditions exist:
• The flaps are extended to the approach
or landing position.
• Either throttle is closed to obtain be-
tween 60 and 70% N
1
rpm (nominal)
with IAS below 150 kt. The audible
warning is repeated if the second throt-
tle is closed after a previous warning
being cancelled and not reinstated.
NOTE
The warning horn also sounds if the
landing gear is down and locked, but
the LANDING GEAR selector lever
is out of the down position, and the
START PWR switch is selected to the
PWR ON position.
OPERATION
General
The main gear side stays and the nose gear drag
brace (Figures 14-1 and 14-3) incorporate in-
tegral locking mechanisms which lock the
gear in both the extended and retracted posi-
tions. Initial movement of the actuator re-
leases the locks; they are engaged by final
movement of the actuators. Main gear inboard
doors are sequenced to the closed position
when the gear is in either the extended or the
retracted position. Nose gear doors are me-
chanically operated by gear movement. The
forward doors are closed with the gear ex-
tended; the aft door remains open.
Normal Retraction
Placing the LANDING GEAR lever up me-
chanically positions the gear selector valve to
direct main system pressure to open the main
14-8
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP PILOT TRAINING MANUAL
FlightSafety
international
PE BUSBAR
GEAR
WARN
CTL
LEFT THRUST LEVER < 70% N
1
, > 60% N
1
RIGHT THRUST LEVER > 70% N
1
, < 60% N
1
FLAPS 25 (SELECTED)
FLAPS 45 (NOT SELECTED)
IAS < 150 KTS
GEAR POSITION SWITCH
(MADE WHEN GEAR
IS NOT LOCKED DOWN)
HORN
Figure 14-7. Gear Warning Horn Circuit Schematic