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practices manuals reflect those used during and certified for airplane
manufacture.
2f1 WG6 Ensure that wiring separation and segregation guidelines that
consider loss of multiple critical functions from a common mode
failure are specified.
WG6 - Task Group 6 has reviewed and discussed this item in the last
team meeting. A FAR requirement for general wiring separation is
being considered for inclusion in the new Wiring FAR section. In
addition, new Advisory Materials will also be developed.
[COMMENT] How general? See earlier comments also.
MJN - I’m assuming comments referred to are “..Need to prevent the
SWR 111 (MD-11) wiring scenario from happening again..”
OWNER REMARKS: WG6 P1
A new rule is drafted under sub-part 251705 so that under normal or
failure conditions as defined by 25.1309, it will not adversely affect
the simultaneous operation of any other system necessary for
combined safe flight, landing and egress.
Corresponding Advisory Materials is included in the new wire
AC/ACJ for EWIS
3a FAA Given the specified conditions, the occurrence of this fault could lead
to potentially critical consequences. Wire or wire bundle chafing in
the presence of flammable materials in the cockpit or electronics bay
could result in wire-to-structure or wire-to-wire shorting arcing
resulting in fire. Flammable contaminants increase the potential for
ignition. More emphasis on cleaning and prevention of fluid
contamination (e.g. drip shields) can mitigate the risks presented by
contaminants and aid in the detection of chafing conditions.
Nondestructive testing can detect wire chafing (after significant
dielectric breakdown) and aid in repair.
[COMMENT] Original statement says flammable materials or
contamination?
Clarification from commenter - The answer to the question only
deals with contamination as I read it. That is the only action
mentioned. Flammable materials, per our discussions in
Committee appears to be ignored.
MJN – since this comment (a) appears to relate to all the items in 3a ,
and due to the fact that the FAA are developing a position on this
subject, I have assigned it to the FAA for comment.
OWNER REMARKS: FAA P1
MJN - Subsequent to these comments being received the FAA has
published their position on flammability and was distributed to all
ATSRAC members by the ATSRAC Chair on March 25, 2002. The
relevant section is quoted below:
“…In summary the FAA does not require that ATSRAC address the
flammability of material adjacent to wire systems. The data
collected by ATSRAC, and the subsequent recommendations
addressed failures of wire systems and not the flammability of
8 April 19 2002 6
material adjacent to wire systems. Efforts are underway that will
reduce the presence of material that does not meet current
flammability standards. Establishing logic in the EZAP to address
flammability is not straightforward and would not consider all
possible sources of ignition. ATSRAC and EAPAS efforts will
significantly reduce the probability of ignition sources. Given the
above, and considering the current difficulties with meeting existing
tasking schedules, the FAA recommends that ATSRAC focus their
recommendations on minimization of ignition sources.
If ATSRAC determines that the EZAP logic should address
flammability of materials in a zone it is suggested that they make a
request to the FAA for new tasking to consider using the EZAP to
address flammable materials adjacent to wiring. As the flammability
aspect is outside of the current tasking and the HWGs were not
established with the appropriate specialists it would be unreasonable
to address it at this point. The FAA will continue to address the
usage of materials that exhibit unsafe flammability characteristics
under current processes…”
3a1 WG6/7 (a) Develop situation-specific guidance to ensure the proper attention
to protection and cleaning wire bundles. (b) Develop guidance on the
separation of wire bundles from non-fire-retardant materials
WG6 - New Regulatory as well as Advisory materials for Wiring
separation are being developed by the group for inclusion in
appropriate sections
[COMMENT] Progress?
Clarification - I was simply worried about the progress of the group.
I think this item is now closed for me as I have heard of the progress
they have made at their recent meeting.
OWNER REMARKS: WG6 P1
A new rule is drafted under sub-part 251705 to ensure that
appropriate separation of EWIS components exist from other
susceptible materials.
Corresponding Advisory Materials is included in the new wire
　
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