S-TEC System 55X, Руководство по эксплуатации

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4-34 2nd Ed: May 31, 2002
SYS FIFTY FIVE X POH
4.3.10 Localizer Back-Course Intercept and Tracking (Optional HSI)
With the appropriate localizer frequency selected, set the course pointer
to the INBOUND Localizer FRONT Course and engage the REV Mode to
track the localizer back course inbound or front course outbound.
When a localizer is channeled and REV Mode is selected, the System
Fifty Five X will automatically execute high sensitivity gain for the
approach and automatically activate the APR Mode. APR and REV will
be annunciated.
If the course needle is at full-scale deviation, the autopilot will establish
a 45
!
intercept angle. As the aircraft approaches the localizer course,
the autopilot senses the closure rate and gradually shallows the
intercept angle. The point at which this turn begins is variable
depending on the aircraft position and closure rate to the course.
However, the turn will always begin between 100% (full-scale) needle
deflection and 20% of full-scale.
During the intercept sequence, the system operates in maximum gain
and sensitivity to needle position and motion and can command the
aircraft to 90% of the standard rate turn. When the localizer course
is intercepted and the needle is centered (indicating course capture),
initiation of the tracking gain program is automatic.
If equipped with the optional remote
annunciator, the APR, REV, and CAP
modes will be annunciated.
The high sensitivity level is maintained for about 15 seconds while
wind correction angle is established. Turn rate maximum is then
reduced to 45% of standard rate.
The optional remote annunciator
will indicate APR, REV, CAP, and
SOFT.