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cable type (ACT 150), which is used on Avro 146-RJ.
4.0 BAE Systems Working Group Report (continued)
August 4, 2000 Industry AFFSP Report Page 35
4.5.3 Condition of Fuel Pumps, Fuel Lines, and Fittings
All fuel system components internal to the fuel tanks were inspected for serviceability, corrosion
and cleanliness, and bonding. No discrepancies have been reported.
4.5.4 Electrical Bonding and Grounding of Fuel System Equipment
No discrepancies have been reported in this area.
4.5.5 Inspection for Foreign Object Debris
No FOD items of any significance have been found during these inspections.
4.5.6 General Tank Condition
The fuel tanks inspected during this programme were found to be in good to excellent condition.
There were no indications that components or installed wiring were being affected on a long-term
basis following prolonged exposure to the fuel tank environment.
4.5.7 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.
4.6 Turboprop Inspection Results
Feedback from the inspections revealed the need for a few corrective actions, but primarily the
tank systems were found to be generally in good to excellent condition. Findings were too few to
Pareto, so they have been summarised as follows:
4.6.1 Integrity of Wiring and Bonding Straps
Jetstream 32
Early aircraft inspections found evidence of chafing caused by cable ties attaching the harness to
structure and by cable ties holding wire bundles together. Instances were also found of the bottom
skin structure chafing wiring.
A mandatory SB has been raised to inspect and rectify wiring harnesses on all aircraft. A trial
wiring harness is being produced that will be used to check the proposed routing and clipping
improvements for the new harness, which will ultimately replace the repaired harnesses across the
J32 fleet.
A dedicated inspection of the boost pump conduit will be included in the maintenance schedule.
4.0 BAE Systems Working Group Report (continued)
Page 36 Industry AFFSP Report August 4, 2000
Jetstream 41
Chafing was found on boost pump wiring below the cable tie at the backshell. Knife cuts through
insulation were found that reflect a lack of care when stripping back braided sheath. Some twisting
damage occurred to wires and conduits during maintenance.
A Mandatory SB has been raised to replace wiring harnesses on all aircraft and to replace conduits
if found damaged.
A dedicated inspection of the boost pump conduit will be included in the MRB report.
4.6.2 Condition of FQIS Wiring and Components
BAe ATP
Silver sulfide contamination had been found on the FQIS tank probes before this inspection
programme. Review of silver sulfide contamination has noted that operators who have had a
reliability problem with the FQIS were those who aggressively clean the silver sulfide coatings
from the probes and connectors. Conversely, those operators who do not disturb the system find
they have virtually trouble-free operation. BAE SYSTEMS Prestwick believes that the problems
experienced by these operators are the result of residues left after improper cleaning of the probes.
It is our intention to issue an SB requiring removal of the FQIS tank probes and inspection for
contamination at the next tank entry. If contamination is found, the probes will be returned to the
manufacturer for cleaning. We further intend to issue a letter to all operators instructing them not
to actively clean silver sulfide deposits themselves, but rather to return any faulty units causing
system malfunction to the manufacturer for cleaning.
HS 748
Silver sulfide contamination on the FQIS tank probes has been found but has not caused the same
degree of problem experienced on the ATP aircraft. This has been attributed to a less intrusive
cleaning action by operators. The fuel system on the HS 748 is very similar to the ATP, the latter
being a reengined and stretched derivative of the former.
4.6.3 Condition of Fuel Pumps, Fuel Lines, and Fittings
No discrepancies have been reported in this area.
4.6.4 Electrical Bonding and Grounding of Fuel System Equipment
No discrepancies have been reported in this area.
4.6.5 Inspection for Foreign Object Debris
No FOD items of any significance have been found during these inspections.
4.0 BAE Systems Working Group Report (continued)
August 4, 2000 Industry AFFSP Report Page 37
4.6.6 General Tank Condition
The fuel tanks inspected during this programme were found to be in good to excellent condition.
There were no indications that components or installed wiring were being affected on a long-term
　
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