INSTALLATION MANUAL
CMA-5024 GLSSU
This document includes Proprietary Information and shall not be reproduced or communicated to third party
without prior written permission by CMC Electronics Inc.
Page D.4
November 21, 2008
BITS DESCRIPTION SETTING DIAGNOSTIC ACTION
Fail = 1 Cannot isolate the
fault; could be internal
or external
First check APD Select
Discrete Inputs (if GLSSU in
Fault mode), all ARINC 429
outputs, antenna, RF cable,
look for abnormally strong RF
interference; then replace
GLSSU;
Normal Op = 0 No action 24 IRS/FMS Bus No. 1
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 23 IRS/FMS Bus No. 2
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 22 FMS/DADS Bus No. 1
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 21 FMS/DADS Bus No. 2
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 20 GP/DIFF Bus No. 1
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 19 GP/DIFF Bus No. 2
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 18 OMS Bus
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 17 ILS #1 Bus
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 16 ILS #2 Bus
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 15 DME #1 Bus
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 14 DME #2 Bus
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 13 Freq/Function Data
Source Bus **
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 12 X-Talk Bus No. 1
Fail = 1 Input bus is inactive* Check bus activity
Normal Op = 0 No action 11 X-Talk Bus No. 2
Fail = 1 Input bus is inactive* Check bus activity
* The condition is irrelevant if the input bus is not connected (not used) actually in the aircraft. The fault
may be internal or external. Additional troubleshooting information follows in paragraph 1.3 below.
** Input #1 when Freq/Function Data Source Select Discrete Input pin is grounded; input #2 otherwise.
1.3 Checking ARINC 429 input bus activity
The following procedure should be used to isolate the location of the failure when a GLSSU input bus
seems inactive or faulty. It is assumed that the data source equipment is connected to the bus and is
functional.
Use an ARINC 429 bus tester and a breakout box to verify that the following ARINC 429/419 data word
labels are actually received at the GLSSU J1 or J3 cable connector end, or if desired at any point along
the bus wiring for tracing up to the data source. Refer to Section II for the connector pin-out
information. The data update (retransmission) rate ranges from about 100 msec to 1 second. Except
The document reference is online, please check the correspondence between the online documentation and the printed version.
To Next Page
Loading...
Need help?
General
