Users Manual

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EFFECTIVITY
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Page 6-1
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
SECTION 6 – MAINTENANCE PRACTICES
1. Records: (TASK 23-15-49)
A. Historical Logs and Records
(1) Historical Logs are provided for manufacturing, product support and maintenance
purposes.
(2) Corruption of a Historical Log such that it cannot perform its function:
(a) Does not inhibit any other SDU function
(b) Causes the corrupted log to be archived (for later inspection in the shop)
(c) Causes a new log to be created for ongoing usage.
(3) The ACD stores the distinct types of Historical Logs in separate structures within non-
volatile memory.
(4) The ACD stores the following information in all Historical Records:
(a) LRU Ticks since power up (32 bits)
(b) LRU Real Time Clock (when available)
(c) UTC Time (when available)
(d) LRU Power on Count (0-65535)
(e) Flight Phase
(f) Aircraft Position and Ground Speed
(g) Antenna pointing information (when available)
(h) Temperature
(i) Transmit power and constellation information
(j) Receive C/No
(k) Beam ID.
B. Historical Usage Log and Records
(1) The ACD maintains a Historical Usage Log that:
(a) Is clearable by user maintenance or factory maintenance action;
(b) Supports a minimum of 15000 Historical Usage Records pertaining to all aspects
of the SDU;
(c) Stores the most recent Historical Usage Records should the capacity be
exceeded.
NOTE: When the Historical Usage Log is full it is acceptable to "age out" a
significant block of the oldest records (e.g. 1500), rather than doing
this one record at a time, if this provides a substantial overall saving in
CPU processing time.
C. Historical Security Log and Records
(1) The ACD maintains a Historical Security Log that:
(a) Is clearable only by Factory maintenance action;
DRAFT
3rd rvw Draft as of:
29 January, 2020