Hawker 800 XP Pilot Training Manual Download

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This activity is normal and indicative of good
magnetic heading data. In turns, the display
may show a steady dot or cross. Following re-
turn to straight and level flight, the indica-
tor will return to the “centered” condition
within 2 minutes.

In the DG mode, without a SLAVE fail indica-
tion on the AHRS controller, the system may
be manually cleared using the DG SLEW knob
and the Slave Error Indicator. This is performed
by turning the SLEW control knob in the ap-
propriate direction to cause the Slave Error In-
dicator to center between the cross and dot.

The verticality of the AHRS may be checked or
corrected during unaccelerated flight by acti-
vating and holding the VG ERECT pushbutton
on the AHRS controller for a minimum of 10 sec-
onds. The ATT flag will be displayed on the
EADI while the VG/ERECT pushbutton is held.
FAST annunciator on the AHRS controller will
illuminate to indicate entry into the “FAST
ERECT” mode of operation. Upon releasing the
VG/ERECT pushbutton, the ATT flag will clear
and roll attitude will become active, and the
FAST annunciator will extinguish.

System Test

The AHRS is equipped with automatic self
test which is performed when power is first ap-
plied. The test lasts 5 seconds and provides the
following visual outputs on the EFIS:

• 10 degrees pitch up

• 20 degrees right wing down

• North heading, turning at 3 degrees per

second toward East

• BASIC annunciator ON

• ATT flag Valid for 2.5 seconds, then in-

valid

• HDG flag Valid for 2.5 seconds, then in-

valid.

• Rate of Turn Indicator standard rate (3

deg/sec) right turn

NOTE

When EFIS is powered up simulta-
neously with AHRS, the self test on
AHRS will not be visible due to the
warm up time of the display heads.

The flags will remain invalid until initializa-
tion is complete.

The AHRS system requires approximately 3
minutes to initialize following application of
power. The initialization is complete when the
ATT and HDG flags clear on the ADI and HSI.
During the initialization, the aircraft must re-
main stationary. Wind gusts and aircraft buf-
feting are not limiting in this respect. Similarly,
all normal preflight operations, including en-
gine starts and passenger loading, may be car-
ried out while the AHRS is initializing. If the
initialization requires more than 3 minutes,
the AHRS may have detected excessive aircraft
motion. If aircraft movement has occurred dur-
ing the initialization, the AHRS will recycle
and a new initialization will commence.

NORMAL OPERATION

Ground Initialization

The aircraft shall remain stationary on the
ground until the attitude, and heading, flags
are pulled out of view. Normal passenger and
cargo loading, engine start, and engine run-up
procedures may be performed during the ini-
tialization. Wind buffeting is not limiting in
this respect. Taxiing or towing the aircraft
during AHRS iniation is prohibited.

Check that 3 minutes following power con-
nection to the DC buses (#1 AHRS P.E. and #2
AHRS PS-2) the attitude, and heading flags are
out of view.

If the flags do not pull after 5 minutes, the
AHRS is not serviceable. This time may be
greater at higher latitudes.

Prior to flight, verify proper AHRS and dis-
play functions by observing the AHRS test se-
q u e n c e . P r o p e r d i s p l a y m o v e m e n t , f l a g

Hawker 800 XP, Pilot Training Manual

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