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MIL-DTL-38449 Signal And Signal/Intercommunication Amplifiers, Universal, Aerial RefuelingThis specification covers the requirements for universal aerial refueling signal and signal/intercommunication amplifiers for use on tanker and receiver aircraft utilizing the flying boom aerial refueling system.

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MIL-DTL-38449D
c. Switch S3 shall be closed for approximately 2 seconds during which time L1 shall
oscillate, the amplifier shall not advance, and DS1 shall remain lighted.
d. Switch S4 (momentary) shall be closed; the amplifier shall advance to the CONTACT
position, DS1 shall be extinguished, and DS2 shall be lighted.
e. Switch S3 shall be closed for approximately 2 seconds during which time L1 shall
oscillate, the amplifier shall not advance, and DS2 shall remain lighted.
4.4.6.3 Intercommunication amplifier tests (classes 3 and 4 only).
4.4.6.3.1 Transmit gain and attack level. The unit shall be tested as follows (reference Figure4):
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