Learjet 60 - Page 173

Pilot's
Manual

Lea,eW
output of the associated AfIS . 7% switches on the pilot's side control
AHS I while
the switches
on the copilot's
side
control AHS 2 . The
SLAVE-FREE switch provides slaving mode selection for the associated
AHS heading output . When the switch is set to SLAVE, the associated
AFS
heading
output will be referenced to its magnetic slaving
unit and
the associated compass
cards will reflect this "slaved" alignment .
When the switch is set to FREE, the associated AHS heading output will
not be referenced to its magnetic slaving unit . The SLAVE L-R switch
provides for manual dewing of the associated compass
cards . Small
heading splits can
usually
be cleared by cycling the SLAVE-FREE
switch to FREE and then balk to SLAVE while the aircraft is in straight
nd level, unaccelerated flight .
AKS/AHS REVERSIONARY MODE
The AHS/AHS switches an to ERS CONTROL panels are used to se-
lect the
attitude
heading system
for the respective
EFIS display
and
flight director . On-side AHS is the normal selection indicated by green
annunciation on
the switch
. Reversionary (cross-side) selection is indi-
cated by an amber annunciation on the switch . AHS reversion on either
side will also cause the following armunciations : "ATT #" (# = system
supplying
attitude
data [1 or 21) on both PFDs
and "MAD #" (# = sys-
tem supplying heading data [1 or 2]) above each compass card .
STANDBY ATTITUDE INDICATOR (Aircraft 60-001 thru 60-248)
TWO-INCH INDICATOR
A standard 2-inch standby attitude indicator (figure 5-9) may be in-
called on the
center
instrument panel . The indicator will provide 92' of
climb, 78' of dive, and 360' of roll attitude information . A sky pointer
is incorporated W indicate vertical
in any roll attitude . Roll index marks
at 10', 20', 30', 60' and 90' provide measurement of angular displace-
ment from vertical as indicated with the sky pointer . Thetwo colored
pitch drum is directly linked to the spin motor of the gyro to
provide
direct reading of
aircraft
attitude in both pitch and roll . The light col-
ored area marked CLIMB represents the sky . The dark colored area
marked DIVE represents the earth . A horizontal white line divides the
colored
areas to represent the
horizon . Index marks are
incorporated
on
the drum to indicate every 5' of pitch in both CLIMB and DIVE atti-
tudes . The adjustable miniature airplane symbol indicates aircraft pitch
and roll attitude relative to the horizon . The symbol is adjustable
through 5' of pitch in both CLIMB and DIVE directions using the
PULL
TO CAGE knob, Rotating the knob moves the symbol and a pointer
that indicates symbol pitch displacement on a scale marked in 1" incre-
ments . The knob is slowly pulled out and rotated clockwise to cage the
gyro . When released, the knob will remain in the extended position . A
500
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PM-123
Change 4