AUXILIARY AVIATION TRAINING MANUAL(111)

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G.4.  Sweep Width Variances
 It is evident that the sweep width can vary for the same situation depending on the POD that is desired.  For Auxiliary application, the SMC may provide a detailed calculation such as that shown in the U.S. Coast Guard Addendum to the United States National Search and Rescue Supplement (NSS) to the International Aeronautical and Maritime Search and Rescue Manual (IAMSAR), COMDTINST M16130.2 (series).
For simplicity, sweep widths based upon a single sweep POD can be used.  When the meteorological visibility is from 3 to 5 nautical miles, the sweep widths given in Table 11-2 should be reduced by two-thirds for large objects and one-half for small objects.  In addition, the sweep widths must be reduced by 30 to 50% for small objects when the winds are in the 20- to 25-knot range and for large objects when the wind is in the 30- to 35- knot range.
The chance for detection of small targets decreases when the wind is above 25 knots and for detection of boats when the wind is above 35 knots.  Winds above 35 knots create considerable turbulence at search altitudes causing rapid crew fatigue and generally make operations by light aircraft difficult.  The turbulence associated with high wind velocities is generally less when operating over open water offshore.
Sweep width estimates for daylight detection aids are given in Table 11-3.
 
G.5.  Uncorrected Sweep Widths
 Table 11-2 presents uncorrected sweep width data for various types of targets for aircraft at various altitudes and visibility conditions.  To determine the suggested sweep width, find the column for the appropriate altitude and visibility.  Read down this column to the target type that most closely describes the search object.  The value is the uncorrected sweep width, which should be interpolated as necessary.
 
G.5.a.  Search Altitudes Below 500 Feet
 For search altitudes up to 500 feet only, the values given for sweep width for a person in the water may be increased by a factor of four, if it is known that the person is wearing a PFD.
 
G.5.b.  Search Altitudes Above 3000 Feet
 Visual searches are seldom conducted from altitudes above 3000 feet; however, for altitudes up to 5000 feet, where visibility exceeds 3NM and target size exceeds 25 feet, the sweep widths given for 3000 feet remain applicable.
 
G.5.c.  Surface Wind Above 25 Knots
 Reduce sweep width by one-half when meteorological visibility is less than 10 nautical miles or when surface wind is above 25 knots.
 
G.6.  Search Aircraft Speed
 Table 11-4 provides values to calculate the sweep width correction based on search aircraft speed.
Select the aircraft’s indicated airspeed, shown across the top of the table then read down the column to the search object line.  This value is the correction to be applied to the uncorrected sweep width factor..
　
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