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materials. The FAA took ownership of this question at the January,
2002, ATSRAC meeting and in March, 2002, published it’s position
that ATSRAC tasking did not include consideration of the
flammability characteristics of uncontaminated materials, nor was
ATSRAC tasked to address the “gap” that is perceived to exist
between current certification standards vs. those used to certify
earlier designs. The FAA concluded that the material flammability
issue will be best addressed by the outcome of R&D and other efforts
currently underway within FAA. T9WG maintains that use of EZAP
to address flammability characteristics of uncontaminated materials
will require the development of an industry agreed upon list of
materials that do not meet current standards.
Boeing - (b) Spatial separation of wiring from structure, systems
components, or other wiring is accounted for in the design of the
wiring system. The guidelines used to design the wiring system are
contained within the Standard Wiring Practices Manual
Airbus - (b) The rules for the separation of wiring from structure,
systems components, or other wiring is accounted for in the design of
the wiring system. These separation guidelines are contained within
the ESPM
Lockheed - (b) LMCO design specifications and the SWPM contain
specific bundle category and segregation distances.
[COMMENT1] But not adequately, ref SWR111 and MD11
[COMMENT 2] Is the spatial separation of wiring in the wiring
system design sufficient in the light of today’s knowledge? What is
the point of conducting inspections if we do not reevaluate designs
using the information gleaned from those inspections? On what is the
ATSRAC to base our acceptance of Boeing’s claim that the wiring
system design guidelines fully address what was discovered in the
intrusive inspection report?
OWNER REMARKS: WG6/OEM P1
WG 6 - Boeing’s wiring system separation design adequately covers
most of the situations, however, it may be necessary to review certain
specific situations for the separation distances from airplane
structures and other components. These situations are covered by the
new AC/ACJ for EWIS.
OEM - The OEMs do not understand the reference to SWR111 and
MD-11, and how that relates to the spatial separation of OEM wiring
systems. Additional clarification is desired.
8 April 19 2002 9
With regard to comment 2, the OEM replies to the IIWG7
recommendation addressed whether guidance needed to be
developed to address separation of wiring from non-fire retardant
materials. Our replies indicated that this aspect of separation was
accounted for during airplane design. The IIWG report did not
indicate that changes to wire separation guidelines were needed to
assure wire integrity.
Please note that the OEMs reviewed the results of the intrusive and
non-intrusive inspections, reviewed our procedures, limitations and
guidelines with those results in mind, and believe that proper use of
the existing recommendations would have prevented or mitigated the
effects of wiring damage found during the inspections. The results of
this review was presented and accepted by the FAA members
participating in the inspections.
In addition to the above, any new requirements which may arise from
HWG6 Sub-tasks 6.7 (Wire Separation Requirements), 6.6 (Wire
System Safety Assessment Requirements) and 6.8 (Wiring
Identification Requirements) will be analyzed and applicable
documentation updated accordingly.
3c1 WG7 (a) Specify guidelines to ensure the proper attention to protection and
cleaning wire bundles
WG7 - (a) General and conditional wiring protection and cleaning
procedures will be included in the SWPM/ESPM minimum content.
[COMMENT] Has there been a review of wire attachments that look
specifically at the areas where the intrusive inspection discovered
problems with loose or missing connections? Have these situations
been incorporated into the SWPM?
OWNER REMARKS: WG7 P1
HWG7 did not conduct such a review of the OEM-specified wire
attachment procedures. Wire attachment and interconnect
information is considered to be minimum content for the electrical
systems standard wiring practices manual.
3g1 WG9 Specify more detailed inspection and testing to ensure potential
chafing problems are spotted and corrected.
WG9 - MSG3 Rev 2001.1 EZAP logic includes a detailed listing of
"Details of Zone", where installed equipment, wire bundles, possible
combustible materials present, L/HIRF protection features, etc., are
determined as a prerequisite to conducting Zonal Analysis of a zone.
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