Users Manual

ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 6-27
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(g) PSC Temperature
(h) Other external SATCOM LRU's.
W. Loss of Cooling
(1) The complete SATCOM is capable of operating in a reduced power consumption mode,
providing a minimal set of services that allow essential operation when the SDU or Power
Amplifier enter an over-temperature condition A correctly installed system should only
enter the over-temperature condition if the cooling provided to the SDU or power
amplifier were to fail.
(2) The SDU records faults to the Historical Fault Log if the SDU enters Amplifier Loss of
Cooling mode due to the external power amplifier indicates the loss of cooling
temperature threshold has been exceeded.
(3) The SDU then proceeds to terminate Channel Card Side B services.
(4) While maintaining at a minimum ACD Safety Services.
(5) The SDU records faults to the Historical Fault Log if the SDU enters SDU Loss of Cooling
mode due to the SDU exceeds a critical temperature and continue to maintain all
services.
NOTE: The SDU internal fan will activate in this scenario to continue full operation.
X. SATCOM LRU Monitoring
(1) The SDU records faults to the Historical Fault log related to:
(a) SCM connectivity
(b) SCM operation (including USIM availability).
(2) The SDU records faults reported from:
(a) SATCOM LRUs including:
1 Antenna
2 Diplexer
3 External amplifier.
NOTES:
1 Some classes of antenna do not report faults.
2 The components listed above may be packaged in 1, 2 or 3
LRUs.
DRAFT
3rd rvw Draft as of:
29 January, 2020