Honeywell SPZ-8000 Maintenance Manual page 536

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3. B.
(2) (n) LOC Track 1 and BC Track 1
Localizer track 1 and back course track 1 signify the aircraft
being on beam center and the roll rate limit being decreased
from 7.5 deglsec during the capture phase
down to 5.5 degjsec
in the track submode. At the track submode occurrence, the
course error is eliminated from the control signal, leaving
beam deviation and lateral acceleration from the IRS to
maintain the aircraft on beam center. The track 1 phase will
occur when the following conditions are all satisfied:
LOC CAP 2 plus 30 seconds.
Estimated beam rate less than 30 feet/second.
Localizer beam deviation less than 20 mV.
Aircraft bank angle less than 6 degrees.
There is no visual indication in the cockpit that the LOC
track 1 submode has occurred.
(o) LOC Track 2 and BC Track 2
The track 2 submode will occur only after track 1 has been
satisfied. There is no visual indication to the pilot that the
track 2 mode has been activated. Radio altitude, distance to
the transmitter, and a vertical velocity indicating the
aircraft is descending are the factors involved in determining
the track 2 condition. When these conditions reach certain
levels, track 2 is tripped so as to provide tighter control
during the final stages of
an
approach.
The track 2 phase will occur when the following conditions are
all satisfied:
LOC track 1 has been tripped.
The aircraft is descending at a vertical speed which would
indicate a runway approach.
c Either of the following conditions has occurred:
- ~i;;~a~e to the transmitter isless than approximately
.
.
- Radio altitude less than 1200 feet with the radio
altimeter valid.
22-14-00
Page 298.48
Aug 15/91
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