MIL-DTL-38449D
3.4.1 Metals. Metals (other than current-carrying parts) shall be of the corrosion-resistant type.
The use of any protective coating that will crack or scale with age or extremes of climatic and
environmental conditions shall be avoided. Metals shall be inspected in accordance with
ASTM-B-117. The use of magnesium or any alloy thereof shall be prohibited.
3.4.1.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar
metals shall not be used in intimate contact with each other. Dissimilar metals shall be as
defined in MIL-STD-889.
3.5 Design. Each class of amplifier shall perform as an electronically settable three-position
switch that advances one position each time an input signal of characteristics specified herein is
received and returns to a READY position when power is removed. The three positions are: (1)
READY, (2) CONTACT, and (3) DISCONNECT. For each position, electrical circuits of the
unit shall provide output power to pin connections as specified in Table I. Valid input signals
which advance the unit from READY to CONTACT or CONTACT to DISCONNECT maybe
generated by either aircraft. When a valid signal condition occurs, the signal must pass from one
aircraft to the other by means of the mated aerial refueling hardware, which contains an electrical
link of induction coils and associated air gap. The induction coils transform the electrical signal
to a characteristic time voltage function as defined herein. The class 3 and 4 units shall also
provide half-duplex voice intercommunication capability between the tanker and receiver aircraft
over the same 2-wire circuit used to transmit or receive the READY, CONTACT, and
DISCONNECT signals, on a mutually non-interfering basis.
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