User's Guide

DRAFT
Page 4-7
17 Mar 2016
23-15-87
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
© Honeywell International Inc. Do not copy without express permission of Honeywell.
(b) BITE
If equipment connected to the A781-500 system provides wrong information or does not
provide a signal to the A781-500 SDU, the SDU cannot function properly.
The SATCOM BITE menu provides information about the results from BITE for various
parts of the A781-500 system.
To check the BITE status, follow the steps in Table 4-.
(3) Post Test
When testing is completed, follow the steps in Table 4-9.
3.0 Check the status of the front panel LEDs. Verify that the green LED flashes for 60
seconds and then turns off. Verify that the red LED is not illuminated. For more
information about the LED signals, refer to "LEDs" on page 1-9.
4.0 Follow the BITE test procedure in "BITE" on page 4-7.
Table 4-8 Power-On Test Procedure
Step Action
1.0 Using the TCP, navigate to the SATCOM BITE page. See "Viewing BITE Information"
on page 2-15.
2.0 Confirm that the following report a status of OK:
•SDU
• Sub System Health
•SCM
• SYS BUS
• Sub System BUS
•RF Path
3.0 If BITE fails the SDU or SCM, remove the component from service and return it to
RC—see "Maintenance and Repair" on page 5-1. Return the UUT along with a
hardcopy printout of the recorded (captured) log file of the test results. Indicate the
date of the test and the serial number of the UUT on the test documentation.
4.0 If BITE fails a component other than the A781-500 SDU or SCM, verify the operation
of that component and test the satellite communication system again. See
"Troubleshooting and Fault Isolation" on page 4-8
5.0 If the Unit Under Test (UUT) PASSED the test, the unit is ready for service.
6.0 Follow the procedures in "Post Test" on page 4-7.
Table 4-7 Power-On Test Procedure (Continued)
Step Action
DRAFT as of
4 Mar 2016