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fixes, and it does not require the participation of unaffected parties
(we don’t need Boeing to help write Airbus AD’s). Therefore, to
insist that the certification basis is adequate unless modified by an
AD is to deny the legitimacy of ATSRAC.
OWNER REMARKS: OEM P3
The OEMs agree that this issue concerns whether materials meeting
flammability requirements in place at the time of initial certification
should be considered to be flammable under present certification
standards. However, we do not agree with the comment that the
results from the IIWG review indicate that some materials should be
replaced. Identification of safety issues remains the responsibility of
the FAA. Removal of materials thought to degrade the operational
safety of an airplane is an appropriate response whereas removal of
materials meeting a different standard from that currently in place for
new airplane designs is not.
8 April 19 2002 42
4a3 ARAC/FAA Accelerate removal of flammable materials from the cockpit and
electronics bay
ARAC/FAA - Airworthiness Directives have been issued for the
metalized mylar insulation
[COMMENT 1] What about other flammable materials ?
[COMMENT 2] Given the extensive period for compliance,
prioritizing the removal of aluminized Mylar from the cockpit and
electronics bay is not an inappropriate or inconsequential
recommendation
OWNER REMARKS: FAA P3
4b1 OEM Specify accelerated removal of flammable materials. Specify
guidelines to minimize moisture intrusion into wire bundles (e.g.
specify drip shields over bundles running under lavatories). Specify
guidelines to minimize moisture accumulation on or near bundles
Boeing - Prevention of contamination, and cleaning of noted
contamination on the exterior of wiring will be included in the
Boeing SWPM. Procedures for the use of drip loops as a method of
prevention for moisture ingression into connectors is presently
outlined in the SWPM. Additional guidelines for the removal of
moisture accumulations within the airplane as a whole are contained
within the specific AMM chapter applicable to the system or zone
under review
Airbus - The results of the ongoing studies aimed at identifying and
eliminating the use of flammable materials in the flight deck and E/E
bay areas, will determine the Airbus required action. Moisture
ingression prevention is presently taken into consideration during the
design of the electrical system. Airbus will include in the ESPM
guidance and practices to maintain the design provisions for the
prevention of moisture contamination to wiring
Lockheed - Expanded requirements for the cleaning of and
prevention of contamination will be included in the revision to the
SWPM. Current SWPM guidelines address moisture ingression
prevention.
[COMMENT directed at Boeing] Why not the materials? Instead of
just contaminant
OWNER REMARKS: OEM P3
This comment is in regard to the response to the recommendation
that the OEMs specify accelerated removal of flammable materials.
The OEMs defined flammable materials as the accumulation of
contaminants over time rather than an assessment of the flammability
of the materials used in the construction of the airplane. The OEMs
support the prompt removal of flammable contaminants and
recommend both that operators do so and provide effective
procedures for doing so. However, we do not support the
identification and removal of materials that meet flammability
requirements and do not degrade the operational safety of the
airplane.
8 April 19 2002 43
4b2 OEM Specify situation-specific wiring separation and segregation
guidelines that consider loss of multiple critical functions from a
common mode failure
Boeing - Wire separation and segregation guidelines are presently
contained within the SWPM and reflect current production design
standard that account for loss of multiple or redundant systems. Any
changes to the standards will be reflected in future revisions to the
SWPM
Airbus - Production design standards specify wire separation and
segregation rules to provide system redundancy. These standards are
described within the ESPM. Any changes to the standards will be
reflected in future revisions to the ESPM
Lockheed - Current guidelines and design practices contain the
requirements for bundle separation and segregation by category.
Certification and design considerations have taken into account the
possibility of loss of multiple functions from a common mode failure
[COMMENT directed at Boeing] No change once again
OWNER REMARKS: OEM P3
An assessment of the current wiring separation and segregation
　
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