Design Interface - continued
Reporting, Analysis and Corrective Action System (FRACAS) - is
developed and implemented with the objective of documenting failures,
analyze their cause, determining corrective actions and disseminating the
All failures are reported in the FRACAS.
Performed on engineering development models, pre-production
and production units.
7.3 All failures and
related information are reported in the system database.
Built-in-test indications and false alarms are analyzed for
7.5 Software trouble reports
are analyzed for corrective actions.
and Materials Selection - utilizes a disciplined design process
including adherence to specific derating guidelines and the use of
Qualified Manufacturers Lists to standardize parts selection.
||8.1 Guidance and/or requirements should
be documented in a parts and materials design guide before the start
of design, addressing parts selection, derating and testability
factors. Adherence to the
guidelines should be verified at
8.2 The order of precedence for parts
selection emphasizes the use of Qualified Manufacturers Lists parts,
particularly for applications
requiring extended temperature ranges.
8.3 Parts and materials selected are
qualified to the worst case Design Reference Mission Profile and
detail design environments. Uprating
or upscreening of
parts is not a best practice and should not be performed.
8.4 Parts derating is required for all
electronic/electrical components. Electrical parameters of parts are
characterized to requirements derived from the Design Reference
Mission Profile to ensure that all
selected parts are reliable for the proposed application.
8.5 A Preferred
Parts List is required prior to detailed design.
8.6 Highly integrated parts (e.g.,
application specific integrated circuits )
are used to reduce:
- The number of individual discrete parts/chips.
The number of interconnections.
- Size, power consumption and cooling
- Failure rates.
A parts obsolescence and technology insertion plan has been
developed and implemented.
8.8 A parts review board is implemented to
assure proper selection and application of parts and materials to
meet performance and
Design Reference Mission Profile requirements.
8.9 The Critical Items
List must include:
- Any item of high technical risk with no
with schedule/delivery risk.
- Sole source items.
- High failure
- Safety of flight items.