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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
MCS--4200/7200 Multi--Channel SATCOM System
2
When the 2R key is pushed on the SATCOM MAINTENANCE (i.e., SAT--N)
page, the SDU initiates a PAST and the page display temporarily goes to the
TEST page where TEST IN PROGRESS 60S is displayed. However, the
SCDU eventually times out the SATCOM subsystem and takes back control
of the display. This is due to the fact that for SCDU-accessed maintenance
pages, the SDU interfaces directly with the SCDU (as opposed to going
through the CFDIU) and is unable to maintain proper bus activity (which the
CFDIU normally does) during initial execution of the PAST.
3
To display the test results, the user must reselect the SATCOM system by
pushing the LS key adjacent to the <SAT prompt on the SCDU MAIN MENU
page, where the initial page shown is the TEST page. If the user does not
reselect the SATCOM system on the SCDU MAIN MENU page after 5
minutes of completion of PAST, the page hierarchy resets to its original
structure as shown in Figure 6-2.
4
The TEST IN PROGRESS 60S message during the POST/PAST Results
Delay period is required to prevent the display of premature test results, i.e.,
to permit continuous monitoring sufficient time to add its contribution to the
POST/PAST results.
(4) TEST Menu Page
(a) General
1
Access to this page is from the SAT--N (i.e., SATCOM MAINTENANCE)
page by pushing LS key 2R. The purpose of this page is to initiate a PAST,
to enable/disable a voice loopback on a selected (physical) channel, to
enable/disable a test of the cockpit voice call light for a selected (logical)
channel, and activation of the cockpit voice go-ahead chime test. See
Figure 6-6 for example pages.
(b) Data Fields
1
Line 3
a
This line displays SELF-TEST beginning in column 1. The asterisk
prompt is not displayed if the aircraft is airborne.
b
If the LS key 1L is pushed when the SELF-TEST asterisk prompt is
shown, the system activates a PAST.
2
Line 4
a
This line displays MP2ABCD VOICE LOOPBACK beginning in column
2. Pushing LS key 2l configures the SATCOM system to perform an
audio loopback test of flight deck channel 1.
Honeywell International Inc. Do not copy without express permission of Honeywell.
23- -20- -35
Page 6--35
15 Jul 2006
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