Vor Cap - Honeywell SPZ-8000 Maintenance Manual

Honeywell #i[!r.cE
3. B. (2) (i) VOR AOSS 1
and
VOR AOSS 2
When the aircraft is flying in the 0SS state, beam deviation is
continually monitored to determine when it is again useful to
include in the command signal. The AOSS monitors beam
deviation. When certain conditions are satisfied regarding
beam deviation, the AOSS will trip. There are two stages to
the AOSS. The first stage is AOSS 1, and AOSS 2 is the second
stage. AOSS 2 will not trip until AOSS 1 has tripped. These
sensors ensure that when beam deviation is again included back
into the control signal it will indeed be useable information.
VORAOSS 1 will occur when the following conditions are all
satisfied:
. VOR 0SS has occurred dependent on the active lateral mode.
. A calculated period of time has elapsed since the last
to/from transition on the EHSI in order for AOSS 1 to trip.
The period of time elapsed is calculated using true airspeed
and altitude. The higher the altitude, the longer it takes
to get through the cone of erratic radio information;
therefore the longer the time period must be. Likewise, the
lower the aircraft altitude, the smaller the cone of erratic
radio information, and the shorter the time period must be
to trip AOSS 1. The required elapsed time period is also
affected by the aircraft's true airspeed. The faster the
airspeed, the quicker the aircraft will be through the cone.'
The slower the airspeed, the longer it will take to pass
through the cone, and a longer time period is required to
trip AOSS 1.
VOR AOSS 2 will occur when the followina conditions are all
satisfied:
. VORAOSS 1 has tripped
. Beam deviation is less
Beam rate is less than
plus 3 seconds.
than 75
mV.
25
feet per
second.
Once VORAOSS 2 trips, beam deviation will again be part of the
control signal.
(j) VOR CAP
VOR
capture will occur
when the following conditions are
satisfied:
The VOR mode has been armed plus 3 seconds of elapsed time.
The lateral beam sensor (LBS) has tripped.
22-14-00
Page 298.46
Aug 15/91
Use or disclosureof intorrnation on this
page is
subject to the restrictions on the title page of this document.