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Biman Bangladesh Corp.
Canadian Regional
Horizon Air
Precidencia Argentina
Fokker 70 KLC
Fokker 100 Alpi Eagles
British Midland
KLM UK *
LAM Mozambique
Portugalia
TAM Brazil
US Airways
* Aircraft inspections with KLM UK are under discussion.
Figure 7-4: Jetliner Inspection Participants
7.3.4 Summary of Jet Inspection Findings
The inspections performed on Fokker jetliners revealed the following:
! Boost pump wire cracking and chafing was detected on F28 aircraft during the inspection of
the wiring.
! Fokker Services received reports of damage to the protection layer of the solenoid and level
switch wiring on the F28.
! On two Fokker 70 aircraft, deteriorated bonding wires inside the wing tanks were
discovered during an inspection not related to this sampling inspection program.
! In general, bonding values measured outside the fuel tank are higher than values found
inside the fuel tanks, previously performed maintenance actions are the main cause for this.
! No correlation was found between airplane age and high or low bonding values.
! No correlation was found between geographic location of airplane operation and high
or low bonding values.
7.0 Fokker Working Group Report (continued)
Page 70 Industry AFFSP Report August 4, 2000
7.4 Conclusions
In general, the fuel systems of Fokker aircraft were found to be in good to excellent condition.
Specific findings of the Fokker Working Group’s sampling inspection program are as follows.
7.4.1 Turboprop
For the F27, a modification is proposed to the routing that will protect against chafing a n d
mechanical damage of the FQIS wiring inside the fuel tanks. This modification is similar to what
is standard on the Fokker 50 and Fokker 60. An operator has successfully installed this new FQIS
wiring routing on one aircraft. Comments and changes are currently under review by Fokker
Services. A service bulletin is planned for the introduction of this alternative FQIS routing.
Fokker Services b.v. is currently investigating the reason for the higher bonding values of several
mechanical components inside the fuel tanks. Corrective actions will be taken when required.
No airworthiness issues were identified during the inspections. The routing of FQIS wiring on the
F27 and the higher bonding values to mechanical components inside the main fuel tanks do not in
any way affect the continued airworthiness of the aircraft.
7.4.2 Jet
Fokker Services has effectively addressed the chafed boost pump wiring on the F28 with an
inspection an d modification service bulletin for the installation of improved pump wiring with
an additional protection braid. This improved boost pump wiring is similar to wiring already used
on the Fokker 70 and 100. The Dutch Airworthiness Authorities have made this service bulletin
mandatory. The inspection part of this service bulletin effectively guarantees the continued
airworthiness of the aircraft in the pre-mod configuration.
No chafed boost pump wiring was detected during the wiring inspection of the Fokker 70 or 100.
Fokker Services plans to issue a service bulletin in 2000 for the installation of protective sleeves
around the solenoid and level switch wiring on the F28. Continued airworthiness of the aircraft
has not been affected.
Since the solenoid and switch wiring on the Fokker 70 and 100 are identical to that installed on the
Fokker F28, a service bulletin is also planned in 2000 for the Fokker 70 and 100 for installation of
protective sleeves around this wiring. The continued airworthiness of these aircraft has not been
affected.
The reason for the deteriorated bonding wires discovered inside the wing tanks of two Fokker 70
aircraft is under investigation. Additional Fokker 70 aircraft will be inspected to verify the extent
of this phenomena. Corrective actions will be taken when required.
Fokker Services will investigate ways to prevent maintenance of line replaceable units from
affecting the quality of bondings. Even though present maintenance manual procedures address
the correct restoration of bonds, future more comprehensive maintenance procedures may be
required. The airworthiness of the aircraft has not been affected.
7.0 Fokker Working Group Report (continued)
August 4, 2000 Industry AFFSP Report Page 71
No airworthiness issues were identified during this sampling inspection program. The Fokker jet
fleet portion of this program has not entirely concluded as of this final report. Fokker Services has
committed to continuing the jetliner inspections with more aircraft to be examined in 2000.
LEFT BLANK INTENTIONALLY
August 4, 2000 Industry AFFSP Report Page 73
　
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