30
COMMUNICATIONS
With engines operating, the C-130 is loud both on the outside and interior. When approaching
the aircraft with the engines or APU operating, wear foam ear plugs. All flight deck
communications are conducted using headsets and the interphone. If you are not wearing a noise
cancelling headset, recommend wearing moldable ear plugs (E-A-R or MAX brand) under the
headset and turning up the interphone radio volume. This provides the best signal-to-noise ratio
for the interphone/radios and some protection from ambient noise. The C-130 uses a low-
impedence, single plug military style headset.
There are two interphone systems, a flight interphone (labeled INT on the intercom panel), and a
HOT MIC interphone system.
Operation of the flight interphone:
To listen, pull up the INT switch
To talk, use the IPH push-to-talk switch on the yoke
Operation of the HOT MIC:
To listen, pull up the LISTEN switch
To talk, pull up on the HOT MIC TALK switch. The headset microphone is “hot,”
transmitting the pilot’s speech without operation of push to talk switch:
If there is an emergency and you need to speak, press the CALL button and you will transmit on
the interphone to all interphone panels regardless of how they are set. When the CALL button is
released, you return to your original settings
.
