Hawker 800 XP Pilot Training Manual Download

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HAWKER 800 XP

PILOT TRAINING MANUAL

FlightSafety

international

2-23

FOR TRAINING PURPOSES ONLY

CONTROL AND OPERATION

The AC system is shown schematically in Fig-
ure 2-24. Each main inverter is controlled by
a three-position START/STOP switch. The
switch is spring loaded from START to the cen-
ter (normal running) position. No. 1 and No.
2 inverters and the distribution lines (XS1,
XS2, XE) are each provided with a FAIL an-
nunciator. With the main and standby invert-
ers off, all five annunciators are illuminated.
Any AC FAIL warning also activates the MWS
flashers.

Holding the INV 1 switch to START ener-
gizes a contactor and a relay to start the inverter
and connect its output to XS1 distribution
line. Contacts in the protection unit close to
provide a lock-on circuit for the contactor and
to extinguish the INV 1 FAIL light. The INV
switch should now be released to the center po-
sition. Energizing XS1 operates a relay to ex-
tinguish the XS1 FAIL light and connect XS1
with XE. Another relay, operated from XE, ex-
tinguishes the XE FAIL light. The XS2 FAIL
light is extinguished because XS2 is powered
via the relaxed No. 2 inverter relay. Position-
ing the control switch to STOP deenergizes the
contactor and shuts down the inverter.

The No. 2 inverter system operates similarly
but supplies XS2 and, when brought on line,
extinguishes the INV 2 FAIL and the XS2,
XS1, and XE failure lights.

In the event of failure of one main inverter, the
associated FAIL annunciator illuminates, the
MWS ELECT repeater flashes, and the ap-
plicable inverter relay changes over to connect
the output of the serviceable inverter to XE,
XS1, and XS2 lines; the contactor is deener-
gized and the failed main inverter shuts off.
With the changeover complete, the XS1, XS2,
and XE FAIL annunciators of the serviceable
inverter remain out.

If any distribution line becomes deenergized,
an associated relay opens to illuminate its
FAIL annunciator and to operate the MWS
ELECT repeater.

The STBY INV switch is set to ARM for flight.
With ARM set, the standby inverter immediately
comes into operation in the event of failure of
both main inverters. The output of the standby
inverter is connected only to the XE line. A
STBY INV ON annunciator illuminates when-
ever the standby inverter is operating.

6-Volt and 26-Volt Supplies

Two unswitched transformers convert the 115-
VAC supply from the inverters into 6 VAC and
26 VAC. These voltages are required for oper-
ation of some of the navigation equipment.

DISTRIBUTION

General

Constant-frequency AC outputs from the in-
verters are fed to certain airplane systems via
distribution terminal blocks (bus bars) XS1,
XS2, and XE, and relevant circuit breakers.
The general service AC circuit breakers are lo-
cated on a subpanel just aft of the copilot’s seat.

OPERATION

With DC power established, turn the in-
verters on and check that the MWS lights
are extinguished.

Check the inverters as follows: Before start-
ing the No. 1 and No. 2 inverters, switch off
the standby inverter and ensure that the XE
FAIL annunciator is on. Move the switch to
ARM and ensure that the XE FAIL annuncia-
tor is extinguished. Start the No. 1 inverter.
Check that the associated INV 1 FAIL, XS1
and 2 FAIL and XE FAIL annunciators are
extinguished. Start the No. 2 inverter and stop
the No.1 inverter, then check that the INV 1
FAIL annunciator comes on. Restart the No.
1 inverter and check that all AC FAIL annun-
ciators are out.

Hawker 800 XP, Pilot Training Manual

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