User's Guide

DRAFT
Page 2-12
17 Mar 2016
23-15-87
© Honeywell International Inc. Do not copy without express permission of Honeywell.
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
On the TCP, press the button next to ANSWER to answer the call or press the button
next to REJECT to reject the call.
(d) Ending Calls
To end a call:
• On the TCP on the menu, press the button next to END CALL.
OR
On the ACP, assert the Place/End switch.
(2) Call Priority
The A781-500 system has four priority settings for calls:
• 1 EMERGENCY (EMG)—highest
• 2 OP-HIGH (HGH)
• 3 OP-LOW (LOW)
• 4 PUBLIC (PUB)—lowest.
(a) Setting the Call Priority
You can set the priority for an air-to-ground four-wire Classic call before making the call.
This priority setting allows for preemption of existing lower priority Aero H+ calls if
insufficient satellite resources exist to establish an independent call, and for preemption
of calls and services within the cabin.
If the four-wire Classic call is the same priority as an existing call, the established call
will be retained and the new call will be queued.
Cockpit calls over SBB are Public priority calls. You can not change the priority.
All calls made from the interfaces other than the cockpit four-wire phones or ACARS
CMU are Public priority calls.
(b) Receiving a Priority Call
If a cockpit call is in progress and a higher priority ground-to-air call is received, the
higher priority incoming call will preempt the existing call. The preemption is automatic,
and the caller in the cockpit has no option to choose between calls.
(3) Saving Telephone Numbers in the Telephone Directory
You can save telephone numbers to the TCP’s telephone directory to use later, and you can
dial telephone numbers from the telephone directory.
NOTE: Saving telephone numbers in the directory may be inhibited by ORT options.
To save telephone numbers to the telephone directory:
DRAFT as of
4 Mar 2016