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incurs an electrical short or fault. During this inspection program, the condition of fault current
8.0 Lockheed Martin Working Group Report (continued)
August 4, 2000 Industry AFFSP Report Page 75
bonding was recorded for electrical equipment in the L-1011’s fuel system. The following
components were evaluated for their fault current bonding:
! Fuel boost pump.
! Crossfeed valves.
! Jettison valves.
! Refuel valves.
! Gravity-feed valves.
! Transfer valves.
! Float valves.
! Isolation valve.
! Pump defuel valve.
All static ground straps were also inspected and the resistances were tested and recorded.
Condition of Internal Wiring and Insulation
All wiring passing into and through the fuel tanks was examined for deteriorated conduits, sleeves,
and insulation. This examination included the boost pump electrical harnesses and conduits.
Condition of Pipe Couplings
Because loose and leaking couplings may compromise the safety of a fuel system, fuel line
couplings were inspected. The inspection verified that the installation was secure and that the lock
wire is in place.
Foreign Object Debris
FOD prevention is a standard aviation safety issue and a heavily emphasized maintenance
practice. Inspection instructions required recording the presence of FOD and a description of the
type of FOD found.
Condition of FQIS
The integrity of the FQIS was determined by performing a functional test on the system in
accordance to the maintenance manual. The capacitance of each tank probe was evaluated.
Condition of Flame Arrestors
Vent-end flame arrestors were evaluated based on a visual integrity inspection of the screens in
accordance with established maintenance procedures.
8.0 Lockheed Martin Working Group Report (continued)
Page 76 Industry AFFSP Report August 4, 2000
General Tank Condition
Were a condition to be found that technicians determined might be a hazard to the safe operation
of the fuel system, a detailed description was to be recorded, and the Lockheed Martin Aircraft
Working Group was to be notified immediately.
8.7 Inspections Performed
The active L-1011s commercial fleet numbered 108 aircraft as of December 31, 1999. Lockheed
Martin’s participation in the AFSSP saw the fuel systems of six L-1011s evaluated in accordance
with the inspection methods established by the AFSSP.
Aircraft no Total flight hours Total flight cycles Inspection type
1 64,039 28,761 Quantitative/qualitative
2 64,425 28,915 Quantitative/qualitative
3 64,846 28,756 Quantitative/qualitative
4 64,307* 16,623* Quantitative/qualitative
5 48,864 13,149 Quantitative/qualitative
6 42,563 22,301 Qualitative
Average: 58,341 23,084
* Wing and center tank inspections were performed at different maintenance checks so displayed values have been averaged.
Figure 8-1: Inspection Summary
Because of unavoidable circumstances, an initial goal of 10 inspections was not achieved. This
program was dependent upon voluntary operator participation, operator schedules, available
personnel and facility resources, and aircraft heavy maintenance visit (HMV) schedules. Although
Delta Air Lines and Lockheed Martin had scheduled fuel tank inspections for the L-1011, none
were conducted because of Delta Air Lines’ subsequent decision to retire all L-1011 aircraft
before their next scheduled HMV. This decision resulted in the cancellation of the remaining
planned fuel tank inspections.
Despite this setback, the L-1011 inspection program yielded a sufficient if not ample amount of
information. This valuable and highly useful data satisfies the Lockheed Martin commitment to
the ultimate objectives formalized by the industry in the AFSSP.
The instructional procedure for conducting the fuel tank system inspection currently exists as a
proprietary in-house engineering document, which serves its purpose of fulfilling the objectives of
the AFSSP. If required, this inspection document will be issued as a service information letter
(SIL). This SIL would serve as part of the compliance methods for the pending fuel system special
federal aviation regulation (SFAR) that is soon to be issued by the FAA (reference: NPRM 99-18).
Results of the first five aircraft were based on a quantitative evaluation. Results of the sixth
aircraft were based on a qualitative evaluation. The quantitative evaluations were conducted with
8.0 Lockheed Martin Working Group Report (continued)
August 4, 2000 Industry AFFSP Report Page 77
the voluntary assistance of ATA (American Trans Air) and included all required numerical and
deficiency code specific inputs—such as instrument readings—as specified in the inspection
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