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Revision 1
7-9
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Oil Warning Annunciators
Pressure switches in each engine’s oil supply
line operate the red OIL 1 LO PRESS and OIL
2 LO PRESS annunciators on the MWS (see
Figure 7-6).
Normally, engine oil pressure holds the switches
open. If the pressure drops below 23 psi, the
switch will close to complete a circuit which
will cause the respective annunciator to be-
come lit. Once the pressure exceeds 25 psi the
switch will open and break the circuit which will
cause the annunciator to become unlit.
IGNITION
Each engine has an independent ignition sys-
tem that consists of:
• Ignition Unit
• Igniter Leads
• Igniter Plugs
• ENG IGNITION Switches
• IGN ON Annunciators.
Ignition Unit
An ignition unit on the upper left side of the
fan bypass housing is a high voltage, capaci-
tor discharge, radio noise-suppressed, inter-
mittent sparking type unit that use a 10 to 30
VDC power supply. The ignition system re-
ceives power from the PE busbar. Each unit
provides separate and independent outputs of
18,000 to 24,000 volts to the igniter plugs.
During the engine start cycle, a microswitch
on each HP fuel/lever provides ignition unit
activation. Once the engine reaches self-sus-
taining speed, the relays deenergize to remove
power from the ignition units.
M a n u a l o p e r a t i o n o f t h e i g n i t i o n u n i t i s
through the ENG IGNITION switch in the
ON position. If required, the unit can be op-
erated continuously.
Igniter Plugs
The igniter plugs, on the annular combus-
tion chamber at the six and seven o’clock po-
sition, operate independently of each other.
Each receives power from the ignition unit
through separate high-tension leads. Each
plug fires at a rate of approximately two
sparks per second when triggered by the ig-
nition unit.
Ignition Switches
Each engine has a two-position (ON/OFF)
ENG IGNITION switch on the cockpit over-
head panel (see Figure 7-7).
In the ON position, the switch will cause the
IGN ON annunciator to become lit and will
supply the ignition unit with 28 VDC from the
PE busbar through the No. 2 start auxiliary
relay. The annunciator only indicates that
p ow e r i s a va i l a b l e t o t h e i g n i t i o n u n i t .
Verification of the igniter firing requires the
ENG IGNITION switch to be turned to the
ON position and listening for two distinct
snaps in the engine area.
ENG IGNITION
1 ON 2
OFF
Figure 7-7. Engine Ignition Switches
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