S-TEC System 55X, Руководство по эксплуатации

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2nd Ed: May 31, 2002 4-25
SYS FIFTY FIVE X POH
4.3.5 Straight-In Localizer Intercept and Tracking (Optional HSI)
With the appropriate localizer frequency selected, set the course selector
to the INBOUND localizer course and engage the NAV Mode to track the
localizer front course inbound or back course outbound.
When a localizer is channeled and NAV Mode is selected, the system will
automatically execute high sensitivity gain for the approach and activate
the APR Mode with NAV and APR being annunciated.
If the course needle is at full-scale deviaton, 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 that 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 at 90% of the standard rate turn. When the localizer is intercepted
and the needle is centered (indicating course capture), initiation of the
tracking gain program is automatic.
If the aircraft is equipped with the
optional remote annunciator the
NAV, APR, 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 NAV, APR, CAP, and
SOFT.