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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
Search Pattern Construction
Search pattern legs and radials are constructed with TF legs (great
circle track to a fix over the ground) using the pattern definition
attributes specified on the search pattern definition page.
The SAR waypoints are defined and inserted in the active flight plan
according to the type of SAR waypoint and are as follows:
Search pattern approach waypoints are named *SPAPx.
D
The initial fix or start position waypoint is named *SPSTx. On the
D
MCDU active flight plan page and MFD, the FMS designates the
start of the search with SPSTx rather than the original name of the
waypoint used to define the start of the search pattern.
The last waypoint (exit point) in the search pattern is named
D
*SPEXx.
Waypoints in between SPSTx and SPEXx are consecutively
D
numbered (000, 001, 002, and so on) and named *SPxxx, where xxx
is the number of the search pattern waypoint after the start waypoint
to the end of the search pattern.
All search pattern waypoints except the search pattern entry and
D
exit waypoints (SPAPx, SPSTx, SPEXx) are displayed on the MFD
with the waypoint number only (for example, SP005 is displayed as
005).
A discontinuity is appended to the end of the search pattern and
inserted immediately before the waypoint at which *SEARCH* was
entered.
All flight plan waypoints beginning with the waypoint at which
*SEARCH* was placed is retained and shifted down.
Search Pattern Operation and Guidance
When a search pattern becomes active, the FMS provides guidance to
transition the aircraft onto the search pattern beginning at the pattern
start position or approach waypoint and continues until the search
pattern exit point.
A CHECK SAR SPEED scratchpad message is displayed when the
FMS determines the helicopter is not able to achieve the SAR speed
target before reaching the start of the search pattern. The SAR speed
target is the predicted speed for SAR approach waypoints and SAR
waypoints.
A28- - 1146- - 181
REV 3 Mar 2009
Honeywell International Inc. Do not copy without express permission of Honeywell.
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