MIL-F-81738 (AS)
4.3,1.2 Candle burning test (M105). The candle assembly shall be mounted on a
suitable fixture in the fireplace of the photometric tunnel in a vertical position with
the ignition end up or down, and 27 inches *3 inches below or above the photometric
axis, as applicable to the tunnel. Ignition of the candle shall be by means of a coil of
quickmatch, firecracker fuse or equivalent and an electrical squib which is placed on
the ignition composition. The squib shall be initiated from outside the tunnel to assure
safety of personnel. The candle assembly shall be rotated at a minimum of 10 to a
maximum of 15 RPM when ignited until burn out of the composition. There shall be
a minimum opening of 40 inches into the fireplace above or below the photometric
axis as applicable to tunnel. The tunnel shall have non-reflecting surfaces. The light
emitted by the burning candle shall fall upon a sensing element which generates a d.c.
voltage proportional to the light intensity. This d.c. voltage shall be applied to a
recording instrument such as an oscilloscope or oscillograph capable of recording elec-
trical output with reference to time. If an oscilloscope is used, the tracing of the
oscilloscope shall be photographed. Before testing, the equipment shall be calibrated
using a projector lamp calibrated by the National Bureau of Standards. From the
recording, determine and record the data required by the requirements of 3.3.1.2,
Defective are flares failing to meet the requirements of 3.3.1.2.
4.3.1.3 Static functionig test (C4). The flares tested shall be suspended from a
1/2 inch diameter steel rod a minimum height of 36 inches above the surface. The
rod shall allow the flare outer container a minimum of 60 inches of free movement
upon ejection. The flare is suspended on the rod with two suspension bands, Drawing
2112843-1. The flare delay time shall be set at values randomly selected. The flare
shall be initiated by a quick pull on the lanyard with an extension of sufficient length
to allow the extension to be pulled around a stake or through a pulley so personnel
will be at right angles to the longitudinal axis of the flare and at a safe distance or
behind a shield. After ejection the candle shall be mounted in a suitable fixture
designed to enable safe functioning by pulling of the cable. Do not look directly at
the burning flare. Record the ejection delay time set, ejections of 1.5 second or less
from pulling lanyard, actual ejection delay times, ignition of candle, and the burning
times of the candle. Defective are flares failing to meet the requirements of 3.3.1.3.
4.3.1.4 Flight functioning test (C5). The flares or Mk 45 drogue trays shall be
tested by launching from aircraft. Launching procedures shall have prior approval of
the procuring agency. The delay times shall be set depending upon altitudes at launch.
The observer shall records fuze separation, functioning, ejections of 1.5 seconds or
less from pulling lanyard, suspension, burning time and dumping time of parachute for
acceptance purposes. Defective are flares or Mk 45 drogue trays failing to meet the
requirements of 3.3.1.4, except those failures attributable to the launching procedures
shall be a no-test and an additional unit shall be tested for acceptance purposes. For
data purposes the observer shall record, type of launcher, type of aircraft, altitude of
aircraft and speed of aircraft at launch. (See 6.3).
4.3.2 Dupability and environmental tests.
4.3.2.1 Forty (40) foot drop test (C6). The flare shall be subjected to the forty
(40) foot drop test prescribed in Test 103 of Standard MIL-STD-331, except the flare
shall be dropped free-fall without guidance system or associated equipment. Defective
are flares failing to meet the requirements of 3.3.2.1.
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