What was found
WHEN GEAR DOWN WAS SELECTED DURING APPROACH TO TOL, NOSE LANDING GEAR DID NOT EXTEND, GEAR WAS CYCLED AND EXTEDNED SUCCESSFULLY. INVESTIGATION REVEALED HISSING SOUND INDICATIVE OF BYPASSING OF LOCK ACTUATOR. ACTUATOR CHANGED, AIRCRAFT TEST FLOWN SATISFACTORILY AND RETURNED TO SERVICE. A RESUMPTION OF DIFFICULTY WITH NOSE GEAR THE FOLLOWING DAY WOULD TEND TO EXONERATE THE LOCK ACTUATOR. DOOR WAS RE-RIGGED AND GEAR CYCLED 10 TIMES BY NORMAL METHOD AND 3 TIMES MANUALLY. AIRCRAFT WAS RETURNED TO SERVICE AND NO FURTHER TROUBLE REPORTED AS OF THIS DATE MAY 24, 1996. (M)