Hawker 800 XP, Pilot Training Manual

Page: 471 / 504

STANDBY INSTRUMENTS
Standby Attitude Indicator
General
An electrically driven standby attitude indica-
tor is located on the left instrument panel (Fig-
u r e 1 6 - 2 9 ) . I n a d d i t i o n t o p i t c h a n d r o l l
information, glide-slope and localizer pointers
and flags are provided which are driven by the
No. 1 NAV receiver when a localizer frequency
is tuned. The glide-slope and localizer pointers
and flags are out of view when the No. 1 NAV
receiver is not tuned to a localizer frequency. In
the event of a power failure, a flag comes into
view. A PULL TO CAGE knob is provided.
Operation
The standby horizon UNARMED/E BAT ON
switchlight is located on the pilot’s instrument
panel. The top half of the switchlight capsule
will illuminate UNARMED when power is first
applied to the aircraft and the standby horizon
will show red OFF flag.
Depressing the switchlight capsule to the armed
E BAT ON position will extinguish the UN-
ARMED annunciator and the standby horizon
is powered from the aircraft’s normal power sys-
tem (28 VDC PS1 radio bus). The OFF flag will
go out of view and the horizon will erect, pro-
vided that it is not caged.
NOTE
Leave the standby horizon caged for
two minutes after ships power is on.
In the event of a power loss of the 28 VDC PS1
radio bus, the No. 3 battery will be automat-
ically applied to the standby horizon to main-
tain the attitude display and internal lighting
on the standby horizon. The E BAT ON an-
nunciator on the bottom half of the standby
horizon switchlight capsule will illuminate
and an aural warning will sound. The aural
warning may be canceled by depressing the
horizon warn cancel pushbutton adjacent to the
standby horizon.
In addition to the above, the standby altime-
ter and airspeed indicators will have their in-
ternal lighting provided by the No. 3 battery,
and the No. 1 N
1
indicator will be powered by
the No. 4 battery.
If normal power is restored to the aircraft, all
systems will revert to the 28 VDC PS1 radio bus
and the system will revert to an armed state.
The aural warning will also sound on the ground
if power is removed from the aircraft and the
standby horizon UNARMED/E BAT ON switch-
light has been left in the ARMED position.
Standby Altimeter
A standby altimeter is provided on the center
instrument panel. Altitude is displayed in the
range of-1,000 to 50,000 feet by a single
pointer read against a dial and a digital counter
(Figure 16-30). The pointer makes one revo-
lution of the dial per 1,000 feet. Gradations in
20-foot increments are numbered at 100-foot
intervals. The counter shows ten-thousands
and thousands of feet. A knob is provided to
set the barascale counter, which simultane-
ously corrects the setting of the pointer and
Revision 1 16A-47
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP PILOT TRAINING MANUAL
FlightSafety
international
Figure 16A-29. Standby Attitude Indicator
(Typical)