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A general inspection of the integral fuel tanks including wing skins, spars, ribs, stingers, and
access covers indicated no signs of degradation or corrosion with the exception of the contact
interface between magnetic dipstick and external wing skin. In general, the fuel tanks were found
to be in excellent condition.
6.7 Summary
Close inspection of the CRJ fanjet and Dash turboprop series aircraft fuel systems has revealed
that they are in excellent condition. Minimal aging effects were encountered; aircraft of various
ages were inspected with similar results. As well as a cross section of airplane ages, airplanes from
different environments were inspected with no variances found in tank condition.
The few anomalies discovered have led to, or may lead to, changes or additions to maintenance
programs, build practices, and design philosophy that enhance the aircraft airworthiness. The
inspection program has heightened the awareness among operators and their maintenance
personnel in particular, of the importance of fuel system condition and bonding.
The CRJ inspection program has identified an area of additional activity: long-term sampling and
monitoring of wire in conduit installations. The intent is to confirm and calibrate the single finding
of chafing for development of appropriate future inspection and/or maintenance actions.
For the Dash 8 (DHC-8) turboprop fleet, the discrepancies identified in the inspection program are
being rectified through a one-time inspection, and the existing aircraft maintenance program for
fuel systems will be updated to incorporate the findings. These findings will also be applied to the
small number of DHC-8 long-range fuel tanks that are in service. Having completed the Dash-8
inspections, Bombardier will carry out a fuel system inspection program for the four-engine
Dash-7 (DHC-7), which is no longer in production. This Dash-7 inspection program is expected to
begin in the fourth quarter of 2000.
The DHC-8 fuel system inspections have identified two areas of additional activity. Bombardier
will undertake to review possible improvements to the bonding-jumper specifications used on
DHC-8 products as well as a lightning test program to understand the effects of increased
bonding-jumper resistance with respect to lightning protection.
In light of an industrywide lack of available information, Bombardier has initiated a parallel
research and development program in conjunction with the support of Lightning Technologies to
determine the detailed effects at the component level of lightning strikes on aircraft. This test
activity commenced in July 1999 and is ongoing. When completed, the resultant data will be used
to validate and improve build techniques and margins for aging aircraft concerns and other inservice
issues.
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August 4, 2000 Industry AFFSP Report Page 65
7.0 FOKKER WORKING GROUP REPORT
Fokker Aircraft b.v. of The Netherlands, a manufacturer of airliners since 1919, produced the
Fokker F27, F28, F50, F60, F70, and F100 turbine-powered transport airplanes. Production of
these jet and turboprop models ceased sometime following the company’s bankruptcy on March
15, 1996, and no additional Fokker aircraft have been produced since then. Today, Fokker
Services b.v. is part of the Dutch Stork Group and the type certificate (TC) holder for these aircraft
models and continues to provide certified inspection, repair, and modification services.
It should be noted that an additional 205 FH27 and FH227 aircraft were produced in the United
States by Fairchild Hiller aircraft under license to Fokker Aircraft. Manufactured between 1956
and 1972, these U.S.-built aircraft do not fall under the TC purview of Fokker Services b.v.
7.1 Scope
Fokker Services b.v. joined the AFSSP in November 1997. Since that time, Fokker has actively
participated in this voluntary industry program’s meetings and its sampling inspection of the world
turbine-powered commercial airliner fleet.
7.2 Working Group Approach
In 1997, Fokker Services implemented an internal fuel systems safety working group. Although
this Fokker Working Group did not include direct airline participation, it kept customers who fly
Fokker aircraft fully informed about the inspection program and actions taken through
! Customer conferences.
! Technical focus group meetings.
! The normal Fokker Services publications.
Fokker Services feels that this approach has been sufficient to meet the needs of Fokker operators.
7.3 Inspection Program
The inspection program initiated by Fokker Services in 1997 addresses every turbine-powered
Fokker commercial aircraft type. To date, all Fokker 50 and 70 and most Fokker 100 inspections
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