User Manual

AFIRS 228S Iridium
Global Communications System Installation Manual
16 July 2014 L-3 Aviation Recorders Proprietary Appendix
165E5733-00 Rev. 03 Page 1
Formatted: Right: -0.19"
Appendix C – System Faults
Iridium SATCOM Built-In-Tests (BIT)
Most of the checks are run as part of the Power-On Self-Test (POST) functionality or the Continuous Built-In Test (C-BIT) functionality.
- POST checks are run when the system is in Initialization Mode
- C-BIT checks are run at regular intervals during Operational Mode and Maintenance Mode
As BIT Checks are performed, the system will identify any "Raise Fault/Failure" conditions (system errors) that will affect functionality.
Sometimes an error can cleared immediately, and there will be no record of it in the fault log. If a system error cannot be resolved immediately,
a Failure, Fault, or Status Message will be recorded and tagged with the specific Date, Time, Position (DTP), and the value will be stored as the
ORT Aircraft ICAO Address parameter.
During the next periodic Continuous tests the system will determine if a recorded system error is still affecting functionality. If it is not, the
Failure, Fault, or Status Message may be cleared. In the event that a condition is cleared, the system will record it as cleared, and tag it with the
specific Date, Time, Position and the value of the associated ORT Aircraft ICAO Address parameter.
Data Area Checks: Ensures that the various data areas utilized by the Iridium SATCOM system are accessible
Power Checks: Monitors voltage inputs to the Iridium SATCOM system and internal voltage rails of the power supply
Temperature Checks: Responds to system critical temperatures reported by the temperature sensors built into the SDU
Internal Interface Checks: Monitors communication with system devices, including the Internal GPS, ISVM, ISDM, the SCM
External Interface Checks: Monitors communication between the Iridium SATCOM system and external systems
Satellite Link Checks: Monitors the availability of the GPS and Iridium satellite links
Formatted Table