Just curious what your minimum altitude is for dumping fuel?
http://www.aeroinside.com/item/3202/...down-in-flight
A Korean Airlines Boeing 777-200, registration HL7531 performing flight KE-32 from Dallas Ft. Worth, TX (USA) to Seoul (South Korea), was in the initial climb out of DFW's runway 35L when the left hand engine (PW4090) emitted a loud bang and streaks of flame prompting the crew to declare Mayday and shut the engine down. The aircraft stopped the climb at 3000 feet, worked the checklists, then decided to dump fuel and climbed the aircraft to 5000 feet commencing fuel dump. After about 40 minutes of fuel dump the aircraft returned to DFW for a safe landing on runway 36L about one hour after departure.