MIL-PRF-83755B
4.6.5 Mounting bracket. The flight check list holder shall be fully assembled with an eight-foot
scroll check list mounted in the flight check list holder. The mounting bracket shall be anchored
by the mounting screws to a flat, horizontal surface. The flight check list holder shall be attached
to the mounting bracket. With the flight check list holder case in the 90° position (end of the case
parallel to the mounting bracket), a 10-lb force shall be applied to the upper center of the face of
the flight check list holder case (above the lens). The flight checklist holder shall not move when
the force is applied. In the same position, a 10-lb force shall be applied to the center of the back
of the case. The flight check list holder shall not move when the force is applied. This test shall
be repeated for the 0° position (shown in figure 1), for the intermediate position between 0° and
90° in which the mounting bracket is designed to hold the flight check list holder, and for any
other intermediate positions. When these tests are complete, the opposite end of flight check list
holder shall be attached to the mounting bracket and these tests shall be repeated.
4.7 Sampling tests. Samples shall be selected from each production lot in accordance with
ANSI/ASQC Z1.4 and subjected to the tests below.
4.7.1 Lens. The lens shall be conditioned for four hours at 70 to 85°F. At the end of the four-
hour conditioning period, the lens shall be placed in a wood and steel frame in a horizontal plane,
as specified in ANSI Z26.1. A 0.5 lb ± 1 ounce (oz) solid, smooth, steel sphere shall be dropped
30 feet ± 2 inches, once, freely, and from rest, striking the lens within one-half inch of its center.
The ball shall be allowed to make only one impact with the lens. No cracks or chips in the lens
shall be visible after the test.
4.7.2 Case. The flight check list holder case with the lens and light removed shall be placed lens-
side down on a level horizontal surface. A 1.0 lb ± 1 oz solid, smooth, steel sphere shall be
dropped 30 feet ± 2 inches, once, freely, and from rest, striking the back side of the flight check
list holder case within 1 inch of its center. The ball shall be allowed to make only one impact with
each case. No cracks, chips, or deformation of the case shall be visible after the test.
4.7.3 Lens replacement. The flight check list holder case shall be opened, the lens shall be
removed and reinserted, and the case shall be closed. This test shall take a maximum of two
minutes.
4.7.4 Light replacement. The light shall be removed from the flight check list holder and replaced
within one minute.
4.7.5 Light. The flight check list holder light shall be connected to a 28 Vdc source. The light
shall be energized at rated voltage and remain energized for a burn-in period of four hours. The
light output shall be measured. The spherical candlepower of the light shall be 0.4 ± 0.02.
4.7.6 Salt fog. The flight check list holder and all associated components shall be subjected to
the salt fog test in ASTM B117 for 50 hours.
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