Limit/Life Testing - is conducted to measure actual hardware and
software configuration items performance for compliance with
performance/design specifications, software requirements and interface
||9.1 Qualification testing is conducted
to measure system
hardware compliance with performance and design
9.2 Accelerated life testing has been
conducted to estimate the life of an item under normal operating
conditions, by identifying potentially
9.3 Step stress testing/accelerated
life testing has been conducted to determine short-term failure
mechanisms by identifying load/stress
to determine design margins.
for Testing/Built-In-Test (BIT) - objectives are to achieve the
required performance monitoring, fault detection and fault isolation
capabilities at the appropriate maintenance levels with the optimum mix of
BIT, semi-automatic test and general purpose manual test equipment.
||10.1 The testability/BIT concept is
defined with the operation concept
and the maintenance concept for all levels of
10.2 Testability analyses have been
conducted concurrently with design at
all hardware and all maintenance
10.3 Fault tree analysis, dependency
modeling and analysis, and failure modes, effects and criticality
analysis has been used to determine
test point requirements and fault ambiguity
10.4 The level of repair analysis is
completed for each configuration item for each maintenance level to
identify optimum mix of BIT,
semi-automatic test equipment and general
purpose test equipment.
10.5 Optimized BIT meets operational
maintainability requirements and typically provides as a
- 98% detection of all failures
Isolation to the lowest
replaceable unit. - Less than 1% false
10.6 Other automatic test equipment and
BIT are compatible.
10.7 Preliminary BIT/testability
analysis is completed by preliminary
10.8 Detailed BIT/testability analysis
is completed by critical design review.
Effectiveness of BIT is validated with
Failure of the BIT circuitry does not precipitate
10.12 Built-In-Test filtering is
applied to minimize false alarms.
10.13 System anomalies and
intermittents are analyzed for possible
changes to the BIT
design, thresholds/tolerances and/or filtering.
Software can be revised
independently and without change to
the operating software.