SF34 CREW HAD ENG PROBS IN ZHU CLASS A AIRSPACE.

Narrative

AFTER BEING IN CRUISE FLT FOR APPROX 20 MINS IN IMC AT -18 DEGS C; WE OBSERVED A MOMENTARY PWR INTERRUPTION IN THE #1 ENG; THE IGNITION LIGHT CAME ON AND A POPPING NOISE WAS HEARD IN BOTH THE CABIN AND THE COCKPIT. 2-3 MINS LATER; THE SAME THING OCCURRED IN THE #2 ENG. WHILE THE #2 ENG'S IGNITION LIGHT WAS STILL ON; THE #1 ENG'S IGNITION LIGHT REILLUMINATED AND SEVERAL MORE POPPING NOISES WERE HEARD. WE DSNDED TO 8000 FT WHERE THE OUTSIDE AIR TEMP WAS ABOVE 0 DEGS C. ENG OP RETURNED TO NORMAL JUST AFTER WE INITIATED THE DSCNT AND THE FLT CONTINUED ON TO ITS DEST WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ACFT IS EQUIPPED WITH GENERAL ELECTRIC CT7-9B ENGS. THIS HAS BEEN A LONG TERM PROB ASSOCIATED WITH HIGH ALT OP. THIS HAS BEEN SO MUCH OF A PROB THAT THERE IS AN OPERATING BULLETIN PUBLISHED. THE OFFICIAL NAME FOR IT IS 'PWR INTERRUPTION.' IT OCCURS ABOVE 15000 FT AND GOES AWAY AT LOWER ALTS. THE RPTR FELT THAT THE ENG ACTUALLY EXPERIENCED A SERIES OF FLAMEOUTS. THE AUTO IGNITION CIRCUIT WAS TRIGGERED. THIS CAUSED AN IMMEDIATE RELIGHT. THE ENG ANTI-ICE WAS ON AT THE TIME. THE COMPANY USES NO FUEL ADDITIVE. THE COMPANY HAS REMOVED AND READ THE FLT RECORDER. THE FAA CERTIFICATION BRANCH IN SEA; AS WELL AS THE NTSB; AND COMPANY HAS EXTENSIVELY DEBRIEFED THE CREW AND FLT ATTENDANTS. THE RPTR DID NOT KNOW WHAT MAINT DID TO SIGN OFF THE CREW DISCREPANCY RPT.