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of the briefing.
a. Trackline Search - (See DIAGRAM 1)
(i) A trackline pattern is most often used in an initial reaction.
(ii) It is very suitable for use by an aircraft available at, or near, the time of a reported
distress.
(iii) The assumptions made are that survivors will be found on, or close to, the
planned route of the missing craft, that the distressed craft is easily discernible,
or that survivors will be capable of signalling should an aircraft be seen or heard.
(iv) It provides a rapid and reasonably thorough coverage of a missing craft's planned
route, and the immediately adjacent area.
SEARCH OBJECT'S TRACK LINE
C
A
B
SEARCH OBJECT'S TRACK LINE
S B
A S
C
1/2 S
1/2 S
DIAGRAM 1 - TRACKLINE PATTERN
b. Parallel Track Search - (See DIAGRAM 2)
c. Search legs are aligned parallel to the major axis of the search area.
d. The pattern is best used in rectangular or square areas.
e. This pattern is very suitable for a search conducted over water.
MAJOR AXIS
MINOR AXIS CENTRE POINT
SEARCH AREA BOUNDARY
1/2S
S 1/2S
S
S
1/2S
DIAGRAM 2 - PARALLEL TRACK
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f. Creeping Line Search - (See DIAGRAM 3)
(i) The creeping line pattern differs from the parallel track pattern in that the search
legs are parallel to the minor axis.
NOTE : WIDTH (W) = LEG (L) + SPACING (S)
SEARCH AREA BOUNDARY
1/2 S
1/2 S
1/2 S
S L W
DIAGRAM 3 - CREEPING LINE
g. Square Search - (See DIAGRAM 4)
(i) The aircraft is flown to make good the tracks shown in the diagram.
(ii) Turns may be to the left, or right, depending upon the observer positions.
(iii) The first two tracks are flown for a distance equal to "S", the third and fourth for
a distance equal to twice "S", the fifth and sixth for 3 x S, and so on.
(iv) The final track to the start point should be the same as the initial search track.
(v) Observations should start at a distance of "S" before reaching the most probable
position to avoid leaving an unscanned portion near the start point.
(vi) Observers should be briefed to pay particular attention to the scanning of the
areas outwards of each turn to avoid leaving unscanned areas during the turns.
(vii) A square search should be planned so that ,whenever possible, the approach
to the most probable position (MPP), and the first leg, is made into wind.
MPP
5S 2S 4S 6S
5S
3S
S
4S
6S
2S
3S
DIAGRAM 4 - SQUARE SEARCH
h. Sector Search - (See DIAGRAM 5)
(i) This pattern is employed when the position of distress is known within close
limits and the area to be searched is not extensive.
(ii) It is simple to execute and provides greater navigational accuracy than a square
search.
(iii) The track spacing reduces towards the centre, resulting in a greater probability
of detection in the area where the target is most likely to be located.
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(iv) Radius of search, angular displacement and mean track spacing (MTS) are
specified with the briefing.
FINISH
DATUM
( prominent feature )
DISTANCE ALONG
CHORD IS TWICE
MTS
START MTS IS A HALF RADIUS
'MTS'
ANGULAR DISPLACEMENT
CONSTANT FOR ALL
SEARCHES
RADIUS OF
SEARCH
DIAGRAM 5 - SECTOR SEARCH
i. Contour Search - (See DIAGRAM 6 AND DIAGRAM 7)
2.2.2 This procedure requires an aircraft to be flown at selected contour levels, adjacent to the
side of the mountain, starting at the highest selective level.
DESCENDS FROM
6000 FT TO 5500 FT
DESCENDS FROM
6500 FT TO 6000 FT
DESCENDS FROM
7000 FT TO 6500 FT
BREAKS OFF ON
COMPLETION OF
SEARCH AT 5500 FT
HAVING COMPLETED
ASSIGNED TASK
STARTS SEARCH AT
7000 FT
HIGH LEVEL
NOT BEING
CONSIDERED
DIAGRAM 6 - CONTOUR SEARCH (PLAN VIEW)
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7000
6500
6000
5500
DIAGRAM 7 - CONTOUR SEARCH
2.3 Electronic Search - (See DIAGRAM 8)
IGNORE SIGNALS RECEIVED
DURING TURNS
SH
SF
COCKED HAT FORMED
BY PERPENDICULAR
BISECTORS OF
CHORDS
MAINTAIN CONSTANT ALTITUDE
SH
SF CHORD 2
DO NOT ALTER
　
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