MIL-DTL-25707F
4.5.7.6 Salt fog (see 3.5.7). Method 509 of MIL-STD-810, in accordance with test apparatus and procedures detailed in
method 509, section II, including Procedure I. The following details shall be specified in the equipment specification:
a.
Pretest data required.
b.
Failure criteria.
c.
Applicable salt solution, if other than 5 percent.
d.
Salt fog exposure period, if other than 48 hours.
e.
Drying period, if other than 48 hours.
f.
Inspection and operation after 24 hours of salt fog exposure where buildup of salt deposits are critical to the proper
operation of the test item.
g.
If operation of electrical system is required.
4.5.7.7 High temperature (see 3.5.1). The sample antennas shall be placed within a chamber and the internal temperature shall
be raised to the temperature specified in accordance with the applicable specification sheet (see 3.1). The antenna will be placed
in the chamber with the radome cover upwards. No retaining screws or devices will be placed on the antenna. The antenna shall
remain in this environment for two hours; at the end of which time, the antenna shall be removed from the chamber, visually
inspected and immediately tested: The antenna shall meet the electrical requirements of 3.6.2, 3.6.3, and 3.6.4.
4.6 Seal test (see 3.4.3). All samples shall be subjected to a seal test by the altitude chamber method. The antennas shall be
fully submerged in a water-filled, transparent container. The test antenna connectors may be covered with a mating cap simulating
the mating connection. The chamber shall be evacuated to a pressure of 1.06 inches of mercury simulating an altitude of
75,000 feet and remain there for a minimum of five minutes. The chamber pressure shall then be raised to 2.5 inches of mercury
simulating an altitude of 57,000 feet and maintained at that condition for a minimum of ten minutes. The chamber pressure shall
then be raised to standard atmospheric pressure for a minimum of one hour. The antennas, upon completion of the seal test, shall
be removed and all excess moisture wiped from the antenna. Any evidence of leakage either by a flow of bubbles during
evacuation or subsequent entrance of water shall be considered a failure. Immediately after the examination, the VSWR and
attenuation tests shall be made.
4.7 Resistance to solvents (see 3.4.4). Place the sample antenna, completely immersed, in the test liquid for a minimum of
24 hours. Upon removal, shake or wipe excess surface liquid from the antenna and test VSWR in accordance with 4.5.2. The
above procedure shall be performed with each of the following test liquids: JP-4 fuel (MIL-DTL-5624) and hydraulic fluid
(MIL-PRF-5606).
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 requisite 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 antenna is a radiation element having an essentially omnidirectional, vertically polarized, radiation pattern
intended for use with airborne identification beacon and TACAN sets. The antenna is military unique since it must survive and
meet performance requirements while mounted on military aircraft, throughout mission, lifecycle, worldwide environments.
6.2 Ordering data. Acquisition documents must specify the following:
a.
Title, number, and date of this specification.
b.
Title, number, and date of the applicable specification sheet and the complete PIN (see 3.1 and 1.3).
First article samples and tests.
c.
(1)
Number of first article samples and combination of antennas, if applicable.
(2)
Point of inspection.
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