Chapter 11. Interphone Communications
Section 1. General
a. The procedures and phraseologies contained in
this chapter apply to interfacility and intrafacility
telephone communications conducted from any
position of operation.
b. Interphone use is restricted to authorized
official business only.
c. Monitor interphones continuously. At facilities
without ringers, keep speaker volume at a level
sufficient to hear all transmissions. In the event of
interphone failure, use authorized backup
procedures; for example, commercial telephone,
aircraft radio relay.
d. Use the words or phrases in interphone
communications as contained in the Pilot/Controller
11-1-2. INTERPHONE TRANSMISSION
Give priority to interphone transmissions as follows:
a. First priority. Emergency messages including
essential information on aircraft accidents or
suspected accidents. After actual emergency has
passed, give a lower priority to messages relating to
b. Second priority. Clearance and control
c. Third priority. Movement and control messages
using the following order of precedence when
1. Progress reports.
2. Departure or arrival reports.
3. Flight plans.
d. Fourth priority. Movement messages on VFR
e. Fifth priority. NOTAM coordination.
f. Sixth priority. Administrative messages; for
11-1-3. PRIORITY INTERRUPTION
Use the words “emergency” or “control” for
interrupting lower priority messages when you have
an emergency or control message to transmit.
11-1-4. MESSAGE INITIATION
Initiate interphone messages as follows:
a. Assure line is not in use.
b. If line is not in use, establish contact with the
desired facility and/or position.
Manual signaling (Ring Line):
FSS(Calls Center via DA/IA Line).
Center “Anchorage Center” or “Sector D5.”
FSS “Kenai radio. Kenai progress Apache One Two
Center “Go ahead”
FSS “Over Kenai...etc.” “LH”
Voice signaling (Shout Line):
FSS “Fort Worth Center, Fort Worth Radio, Clearance
Center “Fort Worth Center, Go Ahead.”
FSS “Request Clearance, Army ......etc.”
c. When calling or replying on an interphone line
which connects only two facilities, you may omit the
“Radio, inbound estimate.”
1. Inflight position. State the name of the
FSS/sector followed by the word “RADIO” and
position, if appropriate.
2. Flight Watch position. State the name of the
associated ARTCC followed by the words “FLIGHT
“Indianapolis Flight Watch.”
11-1-5. MESSAGE TERMINATION
Terminate interphone messages with your operating