User Guide

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Below the battery switches are the switches and warning
lights for the generators; to their right are two ammeters, one for
each generator, plus a voltmeter which can be switched to read
the voltage on the various electrical system “busses.” The items
you really don’t want to do without are powered by the “essential
bus,” and will remain available (at least for a while) with both
generators offline and the battery switch in EMERG. (In addition,
the standby gyro horizon and a couple of key avionics systems
have their own little emergency battery packs.) Further right, more
switches and another voltmeter keep tabs on the airplane’s “tame
AC” system, which uses electronic devices called inverters to pro-
vide frequency-stable 115-volt 400-Hz AC to the avionics pack-
age. Why “tame AC?” Because each engine also has an alternator
providing 208-volt “wild AC,” whose frequency varies with
engine speed; it’s used only for windshield and side window anti-
ice heat.
Running all the way across the bottom of the right half of the
roof panel are the environmental controls. The most important
thing to remember about these is the two rightmost switches,
which control the flow of bleed air from each engine to the pres-
surization and air conditioning systems. They must be OFF for
takeoff and landing to ensure full engine performance, but you
should turn them ON as soon after takeoff as possible. Savvy
Hawker drivers turn them on one at a time, with several seconds’
pause between them, to minimize “ear bumps” as the pressuriza-
tion system comes online.
Finally, just above the windshield, a smaller subpanel has all
the exterior lights on its left side, while the red-painted right side
has the fire extinguisher switches for each engine. There are two
“shots” available; each can be used for either engine, and you can
use both on one side if you have a persistent fire.
MAIN INSTRUMENT PANEL
There’s lots going on here, too. At the same time, however,
you may notice that the panel appears a bit “sparse,” due to the
fact that a number of instruments you’d expect to see are
replaced, instead, by the two large CRT screens directly in front of
each pilot. The one at the top is called the Primary Flight Display
(PFD) and incorporates the functions of the gyro horizon/attitude
director indicator (ADI) as well as an airspeed/mach indicator
(AMI). The lower screen, the nav display, incorporates the func-
tions of an HSI, but includes many other advanced functions.
Pilot’s Audio
Digital Clock
AOA Indicator
#1 Mode Selector Panel (Flight Director)
#1 Radio Tuning
Primary Flight Display (PFD)
Navigation Display
Altimeter & VSI
Brake Pressure
Standby Attitude Indicator
Standby Altimeter
Standby Airspeed
Autopilot
Controller
Thrust Reversers
Fuel
N1 RPM
ITT
N2 RPM
Primary
Annunciator
Dump Valve
FMS1 Control/FMS2 Control
#2 Radio Tuning
Flap Position Indicator
C.P. Navigation
Display
C.P. Primary Flight Display
#2 Mode Selector Panel (Flight Director)
Altimeter & VSI
Cabin Pressure
Secondary Mode Select
C.P. Secondary Mode Select
Co-Pilot’s Audio
Hawker 800XP Main Instrument Panel
Panel Lights
Multi-Function Display (MFD)
Oil Pressure/Temp
Flight Instruction
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Flight Instruction
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