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abort a valid approach.
Since the OSS and LCS sensors are automatically deselected when
ARM APPR is selected on the FMS, this action may cause a
premature POS UNCERTAIN situation with an ILS frequency tuned
and few DMEs in the area. For this reason, the ARM APPR action
should be delayed as long as possible with ILS, LOC and BC
approaches, unless in a terminal area with good DME coverage.
(This will not be necessary if an approved GPS is interfaced, since it
will not be deselected).
In some cases, the pilot may wish to only ARM the approach and not
press ACT APPR. In this case, the FMS will continue to fly all legs
and waypoints that make up the transition to the approach. This
may include procedure turns or DME arcs. When the FMS proceeds
to the inbound leg and sequences the approach label (*ILS 11L* for
instance), then the approach will be automatically activated just as if
he had pressed ACT APPR. This sequence will send the
appropriate logic signals to the EFIS/FGS so that the automatic
transition to the raw ILS signals will occur.
Section V
Operations
2423sv602 5-105
Change 1
In the event that the FMS has a slight position error that causes the
aircraft to fly parallel to the ILS inbound course without LOC capture,
the FMS will advise the crew with the message "FMS-FLOC DIFF
WARN". The pilot should use FMS HDG mode to steer the aircraft
to intercept the ILS.
ILS Approaches When Aircraft is Not Equipped with
Collins Advanced EFIS and APS-85
ILS, LOC and BC approaches may be linked into the flight plan using
normal procedures. However, when 50 nm from the destination, the
ARM APPR option will not appear, and the approach cannot ever be
activated. If the waypoints are flown in sequence, including
transitions, the FMS will provide roll steering to each waypoint, but
all navigation will be predicated upon whatever short range and long
range sensors are being used at the time. Localizer and glideslope
signals will not be available to display on the ADI/HSI nor to couple
to the flight director/autopilot.
All other approach types (VOR, RNAV, GPS, NDB, TACAN and
VFR) will work normally.
Section V
Operations
5-106 2423sv602
Change 1
Procedure Turns
The FMS can fly two different types of procedure turns: the standard
procedure turn and the teardrop procedure turn.
Standard Procedure Turn
The standard procedure turn is defined per ARINC 424 (called a PI
leg type). When proceeding outbound, the aircraft will cross the FAF
and continue for one minute (or less depending upon turn boundary
and groundspeed) before turning to the 45° reversal leg. On ARINC
429 Multifunction Displays the notation (PR-TRN) will be displayed
at the beginning and end of the 45° outbound leg as shown above.
When groundspeed is high, thus causing the aircraft to violate the
procedure turn boundary limit (typically 10nm), then the one minute
outbound leg will be shortened accordingly.
Section V
Operations
2423sv602 5-107
Change 1
Teardrop Procedure Turn
Some approaches are coded such that a teardrop is used to
accomplish course reversal for the initial approach transition. In
these cases the aircraft will proceed outbound from the Navaid using
a “Course-from-Fix-to-DME” type leg that is 15 to 30° from the
inbound leg, then will turn to capture the Course-to-Fix leg inbound
to the IAF or FAF. During the turn, the FMS will command the
correct bank angle, typically in the order of 10 - 20°, in order to
cause an intercept at or outside of the IAF.
NOTE: The limited bank angle algorithm will only be flown if
crosstrack deviation is less than 6 nm at the time of
transition from the outbound to the inbound leg. If
crosstrack is greater than 6 nm, the FMS will command
maximum bank angle (typically 25°) to capture the
inbound leg. This is normally not a problem, as these
types of approaches are defined such that initial
crosstrack deviation is in the order of 3 to 5 nm.
Missed Approach Procedure
When the Go-Around button (certain configurations only) or MSSD
APPR line select key is pressed by the pilot, the current approach
will be canceled. The *EOA* gap will be removed from the
approach, therefore allowing normal leg sequencing after passing
the missed approach waypoint (usually MAxx or RWxx). Lateral
deviation will revert to ±1.0 nm scaling and vertical dev will flag.
NOTE: Pressing the Go-Around button causes the FGS to enter
GA mode. NAV mode should be selected to couple FMS
lateral missed approach guidance.
Section V
　
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