AIRFRAME

The twin jet plane en route to Denver from Hong Kong is merely a green radar blip half an hour off the California coast when the call comes through to air traffic control: ''Socal Approach, this is TransPacific 545. We have an emergency. '' The pilot requests priority clearance to land - then comes the bombshell - he needs FORTY ambulances on the runway. But nothing prepares the rescue workers for the carnage they witness when they enter the plane. Ninety-four passengers are injured. Three dead. The interior cabin virtually destroyed. What happened on board Flight TPA 545?