FLC OF DC10 HAS LOSS OF SATELLITE NAV WHEN USING GPS AS THE PRIMARY NAV AND STARTING FLT OVER THE OCEAN.

Narrative

WHILE USING GPS AS PRIMARY NAV LOST ALL SATELLITE SIGNALS. GPS WENT INTO DR. GPS WAS FUNCTIONING PROPERLY PRIOR TO SIGNAL LOSS AND AFTER SIGNAL REACQUISITION. THERE WAS NO VELOCITY DEV OR CHANGE IN POS. GPS WAS FUNCTIONING PROPERLY; NO FAULTS WERE FOUND WITH THE GPS. SATELLITE SIGNALS WERE LOST IN AN AREA FROM ABOUT 25 NM W OF MKK VOR TO ABOUT 30 NM N OF MKK. SIGNALS WERE REACQUIRED AND GPS RETURNED TO NORMAL NAV. SIGNALS WERE LOST IN THE SAME AREA AND THEN RETURNED TO NORMAL WHEN OUT OF THE AREA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HE WAS FLYING A DC10 AND WHEN HE SPOKE TO ATC THEY DID NOT SEEM VERY CONCERNED. SINCE THEY WERE HDG OUT OVER THE PACIFIC OCEAN; THEY WERE CONCERNED. THE LOSS OF NAV LASTED ABOUT 5-7 MINS. THIS OCCURRED SEVERAL TIMES AND TO SEVERAL OTHER PLTS DURING A 2 1/2 WK PERIOD. WHEN THEY WERE ABOUT 50 MI FROM THE ISLAND THEY COULD SEE THE SATELLITES BEGIN DROPPING OFF. RPTR JUST FOUND OUT THAT THE MIL WAS TESTING FOR JAMMING OF SATELLITES. THE FAA KNEW ABOUT IT BUT DID NOT ISSUE A NOTAM TO ALERT PLTS. THE TESTS WERE TO LAST ABOUT 40 SECONDS; BUT THAT IS NOT WHAT HAPPENED.