The hero pilot and cabin crew involved in a dramatic jet failure this week were forced to return to Singapore again yesterday after a second Qantas flight was hit by engine trouble.Passengers screamed and air crew shouted for them to adopt the crash position after flames or sparks were seen coming from the engine of a Qantas flight leaving Singapore airport with 431 passengers and crew onboard.After calmly landing an A380 superjet that experienced a dramatic mid-air explosion earlier this week, Captain Richard de Crespigny again failed to travel to Sydney yesterday, as he and his cabin crew witnessed a second Qantas explosion, this time as passengers.Flight control: Captain Richard de Crespigny piloted a Qantas jet to safety after an explosion this week and was a passenger on a second flight...