The focus of attention in the investigation of Friday's crash of a Boeing 727 here switched to Washington Sunday.
Experts of the National Transportation Safety Board (NTSB) began their analysis of data contained in two flight recorders, recovered Saturday from the plane's twisted tail section. A NTSB spokesman said both ''black boxes'' had been operating normally, and although the audio on the cockpit voice recorder was of poor quality experts thought they would be able to ''filter it out.'' An early theory that lightning might have caused the crash, which occurred during a rainstorm, appears to have been discarded. At this writing, 153 people were reported to have lost their lives in the crash.