MIL-PRF-62488A(AT)
3.2.5 Metal parts. All ferrous metal parts shall be of corrosion resistant type or treated to
provide corrosion protection and coating adherence equal to or exceeding that provided by hot
dip galvanized 1010 steel with a minimum coating thickness of 50 micrometers (2 mils) on steel
sheet less than 1.6 millimeters (mm) [0.0625 inches (in.)] thick, 64 micrometers (2.5 mils) on steel
sheet greater than 1.6 mm (0.0625 in.) thick or 19 micrometers (0.75 mils) on pregalvanized steel
sheet 1.6 mm (0.0625 in.) thick or less. A material sample shall be capable of meeting or
exceeding the corrosion resistance provided by a galvanized sample (as described above) when
subjected to the mandrel bend test of ASTM D522. Suitable protection against dissimilar metals
and galvanic corrosion shall be provided. Magnesium shall not be used unless specifically
authorized (see 4.5.1).
3.2.6 Non-metallic parts. Non-metallic parts shall be designed to minimize deterioration
caused by exposure to sunlight, sand particles, microorganisms, moisture, temperature extremes,
fuel, hydraulic and lubricating oil, grease, and salt degradation associated with abrasion, load, or
exposure-induced deterioration that can endanger or jeopardize the function of the system
(see 4.5.1).
3.3 Design and construction. The distribution unit shall be fabricated and assembled in
accordance with the manufacturer's design and construction for distribution units, except for
envelope dimensions, mounting dimensions and locations, and electrical mounting interfaces as
shown in Drawing 12310227 and as specified herein (see 4.4.2, 4.5.1, and 4.5.2).
3.3.1 Size and weight. The distribution unit shall be 24.8 centimeters (cm) (9.75 in.) long
by 14.6 cm (5.75 in.) wide by 9.5 cm (3.75 in.) deep. The weight of the distribution unit shall not
exceed 3.6 kilograms (kg) [8 pounds (lbs)] (see 4.5.2 and 4.5.3).
3.3.2 Controls and interfaces.
3.3.2.1 Interface description. The distribution unit shall interface with a variety of audio
accessories, radio sets (receive-transmit), receivers (radio receive only), and field wire line.
Primary interface details shall be as specified in figure 1. When radio sets are used with the
intercom, they are connected to the distribution unit through J501, J503, J509 and J511
receptacles. All four radio sets may be of the receive-transmit type. The retransmission function
requires that two radio sets be connected to receptacles J501 and J503. This function serves as a
radio relay to increase the range between these two external radio sets. When radio sets
(receive-transmit) are not used, direct current (dc) power for the intercom is supplied through
receptacle J508. The radio output of an auxiliary receiver may be connected to the audio input
binding posts to enable monitoring. This monitoring cannot be disabled by intercom controls.
Field wire lines may be connected from a local battery telephone to the line binding posts to
enable two-way communication between any crew member within reach of the distribution unit's
LINE/PRESS TO TALK pushbutton switch. Monitoring field wire line communications is
automatic and cannot be disabled by intercom controls (see 4.5.3).
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business