S-TEC System 55X, Руководство по эксплуатации

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4-8 2nd Ed: May 31, 2002
SYS FIFTY FIVE X POH
During the intercept sequence, the system operates in maxium gain and
sensitivity to needle position and motion and can command the aircraft
at 90% of the standard rate turn. When the selected course is intercepted,
and the needle is centered, indicating course capture, initiation of the
tracking gain program is automatic.
If the aircraft is equipped with an
optional remote annunciator, the
gain level will be indicated. NAV
and CAP (Capture) Modes will be
annunciated.
The high sensitivity level (CAP) is maintained for about 15 seconds while
the wind correction angle is established. After 15 seconds, the maximum
turn rate is then reduced to 45% of the standard rate turn (CAP, SOFT).
The optional remote annunciator
will indicate NAV, CAP, and SOFT.
Approximately 60 seconds later, the turn rate maximum is reduced to
15%standard rate and the lowest level of sensitivity is acheived (SOFT).
At this point, the optional remote
annunciator will indicate NAV and
SOFT. The CAP annunciator will
extinguish.
If the course pointer, on an HSI or HDG bug on a DG, is within 5
!
of center
and needle deflection is less than 10%, the computer will immediately
establish this lowest sensitivity when NAV is selected.
This condition provides low activity levels during station passage when
VOR signals are erratic. In other words, it ignores short-term needle
excursions.
The system includes a course deviation monitor. If the aircraft strays off
course or LOC centerline by 50% needle deflection, the NAV annunciator
flashes a warning. It flashes at station passage because of short-term
needle excursion, and because the NAV signal is inadequate. It also
flashes when the NAV flag is displayed. When this occurs, the FAIL
annunciator will illuminate.