3.12.2 Search Patterns. Prede.ned search patterns (Figure 3-18) are available for use in a .ight plan, or on their own. These search patterns are creeping line, expand-ing square and sector search. A diagram of each appears on the CDU setup screen in order to illustrate the pilot entered values. All search patterns share a common trigger way-point, so changing the waypoint on one search pattern page will change the display for all three. The last displayed search pattern will be considered the selected one, and will be armed if the trigger point is either the TO waypoint or is contained within the next eight waypoints of the .ight plan. When the trigger point becomes the TO waypoint of a .ight plan, the .ight plan will be suspended, and the search pat-tern will be automatically engaged. Steering will continue direct to the trigger point and then through the pattern. Pattern setup screens are as follows:
3.12.2.1 Creepline Search Pattern. The suggested distance on this pattern generated from the FIND screen is limited to the along track (D-2). DIR sets the direction the pattern will expand towards. The controls and functions of the expanding square search pattern are as follows:
CONTROL/ FUNCTION INDICATOR
CREEPLINE Title of screen.
gSTART AT Selects trigger waypoint number and name for edit.
gDIR Enter direction of .rst leg.
3-48 Change 3
CONTROL/ INDICATOR FUNCTION
gORIENT Toggles direction of .rst between LFT and RGT. turn
Change 3 3-48.1/(3-48.2 Blank)
TM 1-1520-253-10
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SK.5 SK.1
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AB0655
SA
CONTROL/ INDICATOR FUNCTION
sENGAGE Activates the pattern immediately. If a trigger waypoint is speci.ed, helicopter will .y a 9direct-to9 leg to the waypoint, and start the pattern. If 0 is entered as trigger waypoint, the pattern will start immediately. When pattern is active, ENGAGE is displayed in reverse video.
DIST-1s Enter cross track (D-1) distance in NM of pattern.
DIST-2s Enter along track (D-2) distance in NM of pattern.
FINDg Access FIND screen.
ARMg Arms pattern, for activation when trigger waypoint becomes the TO waypoint in an active .ight pattern.
RTNg Return to previous displayed
screen.
3.12.2.2 Expanding Square Search Pattern. The controls and functions of the expanding square search pat-tern are as follows:
CONTROL/ FUNCTION INDICATOR
EXPAND-SQR Title of screen.
gSTART AT Selects trigger waypoint number and name for edit.
gDIR Enters direction of .rst leg.
gORIENT Toggles direction of turn to give a clockwise or counter clockwise (CW or CCW) pattern orientation.
sENGAGE Activates the pattern immediately. If a trigger waypoint is speci.ed, helicopter will .y a 9direct-to9 leg to the waypoint, and start the pattern. If 0 is entered as trigger waypoint, the pattern will start immediately. When pattern is active, ENGAGE is displayed in inverse video.
CONTROL/ FUNCTION
INDICATOR
DIST-1s Enter inter track (D-1) pattern
spacing in NM.
FINDg Access FIND screen.
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