S-TEC ST 360 ALT, Pilot Operating Handbook

2nd Ed.  Jan 15, 08

3-7

S–TEC

3.1.5 Decision Height (DH) Select

This selection activates both an audible alert and a visual alert, first when
entering and then when departing a 100 FT window about the actual decision
height.  The actual decision height does not have to be at the center of this
window.

Press the DTA switch, such that ENT is annunciated.  Then press the DH switch.
The DH annunciation will appear flashing.  The selected decision height is now
ready to be entered.  Rotate the Modifier Knob clockwise (CW) to increase the
decision height selection, or counter-clockwise (CCW) to decrease the
selection.  When the Modifier Knob is pushed-in, each detent changes the
selection by 1000 FT.  When the Modifier Knob is pulled-out, each detent
changes the selection by 100 FT.

Once the selected decision height has been entered, press the DTA switch to
make it operational, such that the ENT annunciation is extinguished and the DH
annunciation stops flashing.  The selected decision height will extinguish after
5 seconds, and be replaced by the true altitude (reference section 3.1.2).  The
selected decision height is now armed.

Suppose that the aircraft is descending, and an alert about the actual decision
height of 1160 FT is desired.  Enter a selected decision height of 1200 FT (1.2 on
display), which is the nearest 100 FT setting above the actual decision height,
and make it operational.  Once the aircraft arrives at 1250 FT, a two-tone audible
alert will sound and the DH annunciation will flash for 3 seconds.  This will occur
again once the aircraft arrives at 1150 FT.

Suppose that the aircraft is climbing, and an alert about the actual decision
height of 1160 FT is desired.  Enter a selected decision height of 1200 FT (1.2 on
display), which is the nearest 100 FT setting above the actual decision height,
and make it operational.  Once the aircraft reaches 1150 FT, a two-tone audible
alert will sound and the DH annunciation will flash for 3 seconds.  This will occur
again once the aircraft arrives at 1250 FT.

To disarm the selected decision height, press the DH switch.  The DH
annunciation will extinguish as a result.

3.1.6 Altitude Alerter (ALR) Function

This function activates both an audible alert and a visual alert, at fixed
displacement points from the selected altitude.

Enter the selected altitude, and make it operational (reference section 3.1.3).
Press the ALR switch to arm the altitude alerter function.  The ALR annunciation
will appear as a result.  Thereafter, once the aircraft arrives at 1000 FT from the
selected altitude, a two-tone audible alert will sound and the ALR annunciation
will flash for 3 seconds.  This will occur again, once the aircraft arrives at 300 FT
from the selected altitude.

Following capture of the selected altitude, should the aircraft ever happen to
deviate from it by 300 FT, there will again occur the two-tone audible alert and
flashing ALR annunciation.

To disarm the altitude alerter function, press the ALR switch.  The ALR
annunciation will extinguish as a result.