http://www.casa.gov.au/avreg/aircraft/ad/OVER/AB3/AB3-056.htm
Applicability: All A300 models B4-2C, B4-103, B4-120, B4-203, B4-220, C4-203 and F4-203 aircraft, with production modification number 0013 embodied before delivery. Requirement: Modify the fuel tank jettison system in accordance with Airbus Industrie Alert Service Bulletin A300-28A065 dated 21 April 1993. Note: DGAC AD 93-074-144(B) dated 12 May 1993 refers. Compliance: Prior to 31 December 1994. Background: Compliance with this Directive decreases the likelihood of arcing between the fuel jettision pipe and the fuel tank following a lightning strike on the pipe. The DGAC compliance time is extended by two months.
My frat brother works as a mechanic for United at SFO and also some airport in Hayward....I'll ask him.
I can not imagine a modern jetliner that would not have the ability to dump fuel. It is procedure before an emergency landing to get rid of fuel to bring the aircraft down to a safe landing weight.