MIL-DTL-25866C
The test unit shall not suffer damage or subsequently fail to provide the performance specified by
the detail specification.
4.5.2.11 Underwater operation. When mounted on a suitable bracket and with new
batteries installed, the light shall be turned on manually and then submerged to a depth of 3.5
feet in a tank containing a salt-water solution (3.5 percent sodium chloride by weight). While
immersed, the light shall operate satisfactorily for a period of 10 minutes. For lights that are
considered watertight, satisfactory operation may be construed as meaning that the light
produces a visible beam and an inspection shows that no appreciable leakage occurred during the
10 minute period. For lights that are not considered watertight, the voltage at the lamp socket
shall be measured continuously during the 10 minute period. If the test specimen provides a
visible beam of light and the voltage does not fall below 2 volts during the immersion, the
operation shall be considered satisfactory.
4.5.3 Illumination (photometric). The light shall be subjected to a photometric test to
determine compliance with the light distribution specified in 3.5.1. The test shall be conducted
with the lamp operated at rated voltage and with the light mounted in normal operating position.
The candlepower distribution in a random plane passing through the axis of symmetry of the
lamp shall be determined. The test shall then be repeated in order to obtain light distribution
data in a plane that intersects the first data plane at an angle of 90 degrees and also passes
through the axis of the lamp.
4.5.4 Portability. The light, in operating condition, shall be mounted on a bracket and
oriented in the same manner as it would be over a normal exit in the aircraft. The device holding
the light in its mounted position shall be checked to determine that the light can be easily and
quickly removed. The disconnect on the terminal box shall operate properly. The light shall be
operable after separation occurs.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible packaging
activity to ascertain packaging requirements. Packaging requirements are maintained by the
Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
6. NOTES
6.1 Intended use. The LEU-l/A light covered by this specification is intended for use in
automatically illuminating the exits of cargo-type aircraft immediately after a crash landing.
11
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business