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experienced such an event. HWG9 recommends that aircraft
manufacturers provide guidance to Operators for all such drip shields
required on each aircraft model. If inspection for the shields reveals
inadvertent removal has occurred, consideration should be given to
enhancement of maintenance documents (task cards, manuals, etc.)
with additional information to ensure compliance with drip shield
installation requirements
[COMMENT] Under the Incorporation Plan, HWG9 has
recommended that aircraft manufacturers provide guidance to
Operators for all such drip shields required on each aircraft model.
For completeness, this transfers an action to the OEMs that needs to
be covered by a supplemental OEM comment, as it is in 2.d.2.
8 April 19 2002 18
OWNER REMARKS: OEM P2
As with any component installed on the airplane, except as cited
within the Configuration Deviation List contained within the
Dispatch Deviations Procedures Guide, wiring protection shielding
and guards are required to be installed on the airplane during revenue
service. Replacement of removed shields and guards is both a
standard practice and a regulatory requirement. It is the
responsibility of each operator to ensure that the design integrity of
the airframe is properly maintained and to incorporate maintenance
and inspection programs that follow industry best maintenance
practices.
The OEM’s believe that, although there exists the possibility that
some protection may have been inadvertently omitted on airlines
undergoing extensive modification, we believe that the existing
maintenance procedures in place at the airlines would dictate that
such omissions would be rare. We also believe that the effects of
such an omission would be minor in scope but still recognizable
through normal or enhanced maintenance activities.
Operators should use the guidance provided in the forthcoming
wiring inspection programs, coupled with the guidance contained
within the OEM standard wiring practices documents to either
identify damage caused from missing drip or heat shields, or identify
the conditions that would necessitate protection. The OEMs believe
that any wiring systems training program should emphasize the
purpose and necessity of wiring protection systems.
FOLLOW UP OWNER REMARKS: WG9
WG9 concurs that there is insufficient evidence of problems related
to missing drip or heat shields to warrant a fleet wide campaign to
check for drip shield installation. Determination of type and number
of drip shields per individual aircraft configuration and post delivery
modification would be complex and considered unjustified.
2d2 OEM/WG9 Ensure that drip guard installation and maintenance are appropriately
specified
WG9 - Installation of drip shields are an OEM design issue, and
existing Zonal Inspection requirements should be adequate to detect
malfunction, degradation, or failure of a drip shield. However, it is
possible that a drip shield could inadvertently be left off after
performing maintenance in a zone and the missing shield would not
necessarily be clearly evident. While this situation could exist on any
aircraft, HWG9 concludes that older aircraft that have undergone
repetitive heavy maintenance events are more likely to have
experienced such an event. T9HWG recommends that aircraft
manufacturers provide guidance to Operators for all such drip shields
required on each aircraft model. If inspection for the shields reveals
inadvertent removal has occurred, consideration should be given to
enhancement of maintenance documents (task cards, manuals, etc.)
with additional information to ensure compliance with drip shield
installation requirements.
Airbus - Potential source of contamination of airplane wiring are
identified during the design and development of the airplane, and
appropriate protection in from of drip or heat shields are included to
minimize the effects of contamination. If in-service experience
shows that additional protection against contamination is required,
8 April 19 2002 19
then a design modification will be developed to provide additional
protection. This will be made available to operators through a service
bulletin. In the case of general protection of wiring during unrelated
maintenance, Airbus will be providing protection guidelines in an
upcoming revision to the ESPM
[COMMENT 1] Are visual inspections sufficient to give a complete
picture of whether moisture is or has been present in wiring? The
intrusive inspections showed that visual inspections do not work to
discern the majority of wiring flaws.
With this is mind it seems negligent and wrong to take the position
　
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