AN AIRBUS 300 IN CRUISE AT FL320 DECLARED AN EMER AND DIVERTED DUE TO SMOKE AND FUMES IN COCKPIT; CAUSE UNKNOWN.

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CRUISING ALONG ON N ATLANTIC TRACKS. CAPT IN CREW REST SEAT. FO AND IO IN COCKPIT. IN CLOUDS WITH MODERATE TURB AND ST ELMO'S FIRE. STRONG FUMES AND SMOKE NOTICED IN COCKPIT. EXECUTE EMER PROCS AND CALL CAPT FORWARD. WHEN EXITING CLOUDS; TURB; SMOKE; AND FUMES DISSIPATE QUICKLY. CAPT DECLARES EMER AND WE DIVERT TO YQX. AT GANDER; MECHS SEARCH AIRPLANE FOR POSSIBLE CAUSES. FIND NONE AND AFTER MUCH CONSULTATION WITH ACR MAINT AND DISPATCH WE AGREE TO CONTINUE FLT TO LHR. DURING MAINT PROCESS; MECH ON DUTY HAS TO CALL MECH FROM HOME BECAUSE FIRST MECH SAYS HE IS UNABLE TO SIGN OFF ACFT MAINT LOGBOOKS. SECOND MECH SHOWS UP; COMPLETES THE MAINT REVIEW PROCESS AND SIGNS OFF LOGBOOK AFTER CONSULTATION WITH MAINT. WE DID NOT ASK MAINT IF THEY WERE ABLE TO SIGN OFF ETOPS. POSTFLT ANALYSIS SHOWED THAT HE WAS NOT QUALIFIED TO SIGN OFF ETOPS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FUMES AND SMOKE WERE PRESENT BUT NO CIRCUIT BREAKERS WERE TRIPPED AND EVERYTHING OPERATED NORMALLY. THE RPTR SAID THE TECHNICIANS INSPECTED THE ACFT AND FOUND NO DIRECT CAUSE OF THE SMOKE AND FUMES. THE RPTR SAID THE ACFT HAD NO MAINT HISTORY AND HAS FLOWN FOR SEVERAL MONTHS WITH NO SMOKE OR FUMES RPTS.