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fuel tanks are therefore bonded for a static and lightning requirement.
The bonding of the fuel tank access panels (or manholes) and over-wing refuel panels form part of
the external fuel tank surfaces, and within the Airbus inspection program a sample bond check in
these areas was requested. This requirement was to assess whether there were any aging of the
bonding from the last closure of the panels to the subsequent reopening during the next tank entry.
As stipulated in all manufacturers’ maintenance manuals, each time a fuel tank access panel is
opened, the closure task includes a bonding check to the value of the initial build.
Airbus require the bonding of internal components to the structure inside the tank, hence providing
a dual path. To measure these resistances would require breaking the bonding path, which is time
consuming and not necessary. As there is visual and tactile inspection stipulated for each lead
inside each tank, the integrity of a minimum of one path is preserved. Bonding checks are only
requested if a bonding lead shows signs of heavy deterioration, such as fraying of the outer braid
or excessive blackening or contamination with copper sulfide.
Couplings
Airbus has designed in a secondary path in its couplings, and where a secondary path has been
assured by inherent bonding as it is with the W/B and S/A product lines, a dedicated bonding path
has now been initiated via a one-time rework SB. The L/R product line uses a dedicated secondary
path using bonding leads, hence the rework SB action does not apply on the L/R product.
FOD and Tank Condition
This will be a general inspection inside each tank and surrounding components. Airbus has also
within its AWG the boost pump suppliers to monitor and report any signs of FOD from shop
return in order to check if debris can enter the screening that are provided to prevent FOD from
entering the pump impellers.
‘Tank condition’ was defined as the general visible tank integrity, i.e. any visible corrosion,
looseness of components or structural FOD.
FQIS Wiring and Probes
FQIS wiring is a low-power system that includes all fuel probes, level sensors, temperature
sensors, compensators, and densitometers fitted inside the tank.
3.0 Airbus Working Group Report (continued)
Page 22 Industry AFFSP Report August 4, 2000
Airbus FQIS is a low-energy system. The harnesses are routed through sleeving or non-metallic
conduit secured by clamps fixed to structure. The FQIS computer is designed to limit the current
provided to the in-tank components. Inspection of FQIS components and wiring looked for FOD,
chafing of the wires, and any sulfide corrosion. Airbus together with all the other manufacturers
agreed that there is no requirement to dismantle wiring installation in the inspection process, as
this could potentially introduce damage from the intrusion.
Flame Arrestors
Airbus uses flame arrestors on the open end of fuel tank vents to prevent ignition during a ground
fire. These will be visually inspected for FOD in the SIL.
3.6 Inspection Program
The following tables provide the fleet data and the number of returned results. It should be noted
that a high number of operators volunteered to perform inspections even though they were not part
of the initial AWG activities.
Aircraft Flight-hours Flight cycles
type
First
delivery
Total
delivered
Currently
operating Average Highest Average Highest
A300B 10-May-75 249 142 36192 55967 22455 35918
A300-600 25-Mar-84 241 230 19751 47996 10211 27794
A310 25-Mar-83 255 236 30127 60331 11821 25779
A319* 25-Apr-96 249 249 4067 9654 2586 8697
A320 26-Mar-88 838 832 15625 46650 9030 25839
A321 27-Jan-94 164 164 6923 14778 5069 16026
A330 30-Dec-93 156 156 7648 24160 2675 7966
A340 29-Dec-93 181 179 15230 33586 2424 5898
As of June 30, 2000.
* The A319 data is shown as the aircraft was in service during the launch of the AFSSP program; as the inspections were
carried out within the schedule 4C check (between 4 to 5 years), however, there were no results due to the AFSSP cutoff date.
Figure 3-3: Airbus Fleet Data
3.0 Airbus Working Group Report (continued)
August 4, 2000 Industry AFFSP Report Page 23
Modification SBs
[one-time rework]
Bonding Lead Inspection SB
[visual / tactile inspection]
Service Information Letter (SIL)
Twin-aisle [includes bonding checks]
Mandated by DGAC AD 98-174-248(B)
Compliance: next ‘4C’ check
One-time voluntary inspection
(ISB requirements incorporated)
A300B
SB 28-0073
Estimated labor-hours: 183
Mod 11848
ISB 28-0072
Estimated labor-hours: 150
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