AD 99-04-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A300 B4-601 | Airworthiness Directives; Airbus Model A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-603 | Airworthiness Directives; Airbus Model A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-605R | Airworthiness Directives; Airbus Model A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-620 | Airworthiness Directives; Airbus Model A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-622R | Airworthiness Directives; Airbus Model A300-600 Series Airplanes |
| aircraft | Airbus | A300 F4-605R | Airworthiness Directives; Airbus Model A300-600 Series Airplanes |
| aircraft | Airbus | A300 F4-622R | Airworthiness Directives; Airbus Model A300-600 Series Airplanes |
Unsafe Condition
Continuous aft transfer of fuel due to the fuel level sensing amplifier (FLSA) not supplying electrical power to the trim tank overflow sensor, which could result in potential loss of fuel during flight.
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Required Actions
Remove the fuel level sensing amplifier (FLSA) of the trim tank system, modify the polarization pin code in the electronics bay, and install a new, improved FLSA in accordance with Airbus Service Bulletin A300-28-6055, Revision 01, dated July 24, 1998.
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Compliance Time
within 2 months after the effective date of this AD
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Affected Aircraft
Airbus Model A300-600 series airplanes on which Airbus Modification 4801 was accomplished during production and Modification 10778 has been accomplished; except those with Modification 11683 accomplished.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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