Hawker Beechcraft Hawker 800XP, Руководство по эксплуатации для пилотов

Страница: 99 / 923

Page 2-22
Pilot’s Operating Manual
Revision A1: Nov, 2002
Sub-section 2
ENGINES
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
IGNITION
Each engine has an independent ignition system that consists of:
• Ignition Unit
• Igniter Plugs and Leads
• 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, capacitor discharge,
radio noise-suppressed, intermittent sparking type unit that uses a 10 to 30 VDC power supply. The
ignition system receives 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 micro switch on each HP fuel lever provides ignition unit activation once
the engine reaches 10% N
2
.
Once the engine reaches self-sustaining speed, the relays de-energize to remove power from the
ignition units. Manual operation of the ignition unit is through the ENG IGNITION switch in the ON
position. If required, the unit can be operated continuously.
Igniter Plugs and Leads
The igniter plugs, on the annular combustion chamber at the six and seven o’clock positions, 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 ignition
unit.
Ignition Switches
Each engine has a two-position (ON/OFF) ENG IGNITION switch on the flight compartment overhead
roof panel. In the ON position, the switch will illuminate an IGN ON annunciator on the flight
compartment overhead roof panel 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 power is available to the ignition unit. 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 2
OFF
ON
IGN ON
Overhead Roof Panel