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|  MIL-C-45975B(AR)
APPENDIX B
40.6.3 Degraded modes of operation. A certain amount of performance degradation
must take place before a reliability failure can be assumed, If the system ceases
to function, performance becomes unacceptable (i.e., non-existent); however, if
performance-is only degraded, then some threshold must be extablished to define
where reliability failures begin. Allowable degradation thresholds have been
established for the various performance parameters. Performance beyond these
thresholds constitutes a reliability failure. As long as performance remains
above the threshold or is returned above the threshold within five minute
maintenance period, no reliability failure is charged.
3 rounds/rein
a. Rate of Fire - maximum
1 round/1.5 min
b. Rate of Fire - sustained
40.6.4 Failure exclusions. Based on 14 November 1973, Scoring Conferences:
Training and Doctrine Command (TRADOC) representatives did not wish to have
obturator pad and split rings replaced on a scheduled basis. The TRADOC preferred
approach is to leave parts in until no longer serviceable to get maximum service
from each part, but not count these part replacements as reliability failures.
TRADOC wants expected obturator life data in TM's to supplement the explanation of
conditions requiring replacement, however, there should not be a prescribed
replacement schedule in the TM's. ARRCOM concurs.
40.6.5 Failure scoring procedure. The following scheme provides the instructions
for the use of the failure definition (see 50.4) for assessing reliability
requirements of the Cannon, 155MM Howitzer: M199 (see 30.1). These instructions
assume that an incident or malfunction has occurred during test, and a record has
been prepared against this action to the extent where it is necessary to determine
the chargeability of the action. Incidents where the identification of a
reliability failure is in doubt will be deferred to a user/developer/tester
Scoring Conference. The step-by-step instructions for using the failure
definition are as follows:
Step 1. Board the incidnet information whenn a malfunction of the cannon
occurs or is detected (rounds on test item and system, description of incident,
nature of maintenance action required, maintenance time in hours, maintenance
manhours, etc.). proceed to the next step answeing the question posted and takng
action according to the answer given.
Step 2. Is this a scheduled replacement of parts before failure? If yes, do
not charge a failure; if no, proceed to Step 3.
Step 3. Is this a malfunction resulting from not following the prescribed
operational or maintenance procedures or schedule dictated by the equipment
manuals? If yes, do not charge a failure; if no, proceed to Step 4.
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