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basis following prolonged exposure to the fuel tank environment.
4.6.7 Other Items
BAE SYSTEMS included an inspection of fuel tank access covers in its programme. Results of
these inspections show no discrepancies and indicate that lightning protection is being maintained
with routine tank entry activities.
4.7 Summary
BAE SYSTEMS, in cooperation with a wide cross section of their operators, have inspected a
large number of aircraft. The results have been positive with few findings of significance reported.
This result is believed to reflect the relative simplicity of the fuel systems, and the use of good
design practice as promoted through existing airworthiness requirements. As the type design
authority, BAE SYSTEMS is working with the UK CAA on the findings highlighted in the
preceding report. In many cases, individual courses of action have already been agreed and
enhancements have been implemented.
Data gathered during the AFSSP inspection programme will be used as part of BAE SYSTEMS’
ongoing aging aircraft programme. This fuel systems knowledge will be used to help validate such
aspects as maintenance schedules and inspection techniques.
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August 4, 2000 Industry AFFSP Report Page 39
5.0 BOEING WORKING GROUP REPORT
5.1 Introduction
At the inception of the Aircraft Fuel System Safety Program (AFSSP), each airframe manufacturer
formed its own airplane working group (AWG) to address the airplanes in their respective fleets.
In August 1997, The Boeing Company and McDonnell Douglas merged. The designations Boeing
Puget Sound and Boeing Long Beach today denote these two major commercial airplane centers.
Boeing currently produces the single-aisle 717 (which began as the MD-95), Next-Generation 737
(third generation of the 737 family), and 757. On the twin-aisle front, Boeing produces the 767,
777, and 747-400 (current generation of the 747). Boeing continues to support the 707, 727,
earlier-model 737s and 747s, DC-8, DC-9, MD-80 / -90, DC-10, and MD-11.
5.2 Scope
The Boeing Working Group reviewed requirements, drawings, and manufacturing processes and
performed inspections of fleet aircraft. Boeing conducted extensive requirements, drawing, and
manufacturing reviews. The inspection portion of the program was a cooperative effort between
Boeing and participating airlines to develop inspection instructions, conduct inspections, and make
recommendations. The following details this effort and its results.
5.3 Additional Activities
The industry AFSSP is one of many efforts to investigate and enhance fuel system safety.
Examples of other recent activities that have resulted in fuel system safety findings and
enhancements are National Transportation Safety Board (NTSB) accident investigations, the
Federal Aviation Administration’s (FAA) Notice of Public Rulemaking (NPRM) and Special
Federal Aviation Regulation (SFAR) on Fuel Systems, the Aviation Rulemaking Advisory
Committee (ARAC) on Fuel Tank Flammability Reduction, and various government and industry
research and test programs. There is also an established and active safety process within Boeing to
review, assess, and implement safety-related changes regardless of other activities internal or
external to Boeing.
As such, there have been a number of fuel system modifications and enhancements implemented
on Boeing airplanes as a result of governmental, regulatory, and Boeing initiatives that were
outside the scope of the AFSSP or the Boeing AWG. Some of the more significant items on
Boeing products that were addressed outside of the AFSSP were the FAA-mandated inspection
and / or addition of protective sleeving on fuel pump wiring, the FAA airworthiness directives
(AD) on the 737 and 747 Classic airplanes requiring separation and shielding of fuel quantity
indication system (FQIS) wiring, an AD for MD-80-series wing heater blankets, and the NTSB
recommendation and FAA AD on the 747 Classic to remove specific fuel probe terminal blocks
and inspect/replace FQIS wiring. In addition to these specific findings, there are additional
research activities underway to assess potential issues and develop solutions that would further
5.0 Boeing Working Group Report (continued)
Page 40 Industry AFFSP Report August 4, 2000
enhance fuel systems safety, which are also outside the scope of this program and therefore not
included in this report.
5.4 Working Group Teams
The working group established to address the Boeing airplane family was split into three teams.
One team addressed the Boeing Puget Sound single-aisle airplanes, the 707, 727, 737, and 757.
Another addressed the Boeing Puget Sound twin-aisle airplanes, the 747, 767, 777. A third team
　
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