INSTALLATION MANUAL
CMA-5024 GLSSU
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without prior written permission by CMC Electronics Inc.
Page C.15
November 21, 2008
Commentary: The FMS will understand that RAIM will not be available if the GLSSU flags critical
faults via the operational mode bits in ARINC label 273 (set to Fault mode), or if the
GLSSU is in Self-Test mode or initialization mode. The GLSSU indicates problems with
the RF section via bit 26 of ARINC label 355 (connector, cable or antenna failure). The
RF antenna is classified as a non-critical fault; therefore, the mode bits in ARINC label
273 will not be set to Fault mode if these conditions exist. However, it may be an
indication to the FMS that the GLSSU is unable to update its almanac if it has expired.
1.24 Label 170 - Satellite Deselect #2 - Input
ARINC BIT DESCRIPTION SETTING
32 Parity Odd
31-30 Sign Status Matrix
(SSM)
Normal Operation = 00
No Computed Data = 01
Functional Test = 10
Not Used = 11
29 SVID 17 De-select =1
Enable =0
28 SVID 18 De-select =1
Enable =0
27 SVID 19 De-select =1
Enable =0
26 SVID 20 De-select =1
Enable =0
25 SVID 21 De-select =1
Enable =0
24 SVID 22 De-select =1
Enable =0
23 SVID 23 De-select =1
Enable =0
22 SVID 24 De-select =1
Enable =0
21 SVID 25 De-select =1
Enable =0
20 SVID 26 De-select =1
Enable =0
19 SVID 27 De-select =1
Enable =0
18 SVID 28 De-select =1
Enable =0
17 SVID 29 De-select =1
Enable =0
16 SVID 30 De-select =1
Enable =0
15
SVID 31 De-select =1
Enable =0
14 SVID 32 De-select =1
Enable =0
13-12 Reserved
11 De-selection type Destination Predictive RAIM =0
Alternate Predictive RAIM =1
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