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procedure document.
The qualitative evaluation of the sixth aircraft was based on the same inspection document but
focused on a visual-integrity method of inspection. It should be noted that the sixth aircraft was a
recently retired aircraft and not part of the ATA fleet. This fact does not bear significance to the
finding’s applicability toward the AFSSP. Identified discrepancies were independent of the retired
condition of the aircraft. It should also be noted that the fuel boost pumps and valves had been
removed before the inspection and were therefore identified as inaccessible.
The qualitative inspection approach was determined to be the most efficient and justifiable means
of conducting the fuel tank system evaluation of the sixth aircraft based on allowable time and
available resources. Thus, although the sixth aircraft inspection was not totally comprehensive, it
did capture significant findings and contributed to the AFSSP.
8.8 Results
Specific findings from the inspected aircraft are as follows:
8.8.1 Fault Current Bonding
Among the first five airplanes inspected, the fault current bonding of two boost pumps and four
refuel valves were found to be out of tolerance. On the retired L-1011 that was the sixth airplane
inspected, these components were inaccessible for fault current bonding evaluation.
These out-of-tolerance measurements on the first five airplanes minimally exceeded the assigned
tolerance criteria and were determined not to be significant with respect to compromising the
integrity or safety of the aircraft. As called out in the inspection document, they warranted
immediate corrective maintenance action in accordance with established maintenance practices to
remedy the discrepancy. Although these specific findings were determined not to be safety critical,
they identified the need for further investigation.
8.8.2 Component Wiring
No discrepancies were observed in the wiring of any of the six inspected airplanes.
8.8.3 Static Ground Straps
Among the first five aircraft inspected, a loose clamp was found that resulted in a static ground
strap bonding value that was minimally out of tolerance. In contrast to this minor discrepancy, the
fuel tank inspection of the sixth airplane produced significant findings: Fifteen static ground strap
deficiencies were identified. Of these, 10 ground straps had not been installed, 3 were improperly
installed, and 2 were damaged.
These missing static ground straps were determined to be an issue with the potential of affecting
the safety condition of the aircraft. As such, they have warranted a preventative action evaluation.
8.0 Lockheed Martin Working Group Report (continued)
Page 78 Industry AFFSP Report August 4, 2000
8.8.4 Couplings
The first five aircraft showed no coupling deficiencies. The sixth included six improperly installed
couplings and one that was damaged. As with the findings from the first five inspected aircraft, the
findings of the sixth aircraft were determined not to be safety critical although the seven coupling
discrepancies have identified a need for further investigation.
8.8.5 FOD
There were no significant FOD findings in any of the six inspected airplanes.
8.8.6 FQIS Wiring
No discrepancies were found.
8.8.7 Vent Flame Arrestors
No discrepancies were found.
8.8.8 General Tank Condition
The general condition of L-1011 fuel tank systems is good to excellent. No significant
deterioration or factors affecting airworthiness have been identified.
8.8.9 Evaluation of Results
All findings were determined not to be design-related issues and were correctable by means of
appropriate established maintenance procedures. As specified in the inspection document, the
maintenance procedures performed to alleviate out-of-tolerance findings served as the immediate
corrective action for each identified discrepancy during the inspection. Based on the evaluation of
results, plans for preventative action and continued investigations were to focus on opportunities
for improvement of maintenance practices.
The single significant issue resulting from the inspection program was the missing static ground
straps of aircraft six. Evaluation of this issue determined that efforts toward developing a
preventative action plan were warranted. All other findings were determined not to be significant
with respect to compromising the integrity or airworthiness of the aircraft. Regardless, identified
out-of-tolerance findings indicated a need for further research to complete a comprehensive
investigation and ensure all aspects of the inspection had been adequately addressed.
8.9 Action Plan Approach
The intent of the Lockheed Martin action plan is to support the initial AFSSP mission statement
　
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