PAX ON B757 MOVED ABOUT CABIN WHILE SEATBELT SIGN WAS ILLUMINATED DURING SCENIC FLY-BY OF MT RAINIER. MISBEHAVING PAX WAS A COMPANY CHK AIRMAN. HE THEN DEMANDED ACCESS TO THE COCKPIT TO DISCUSS THE OP WITH THE FLT CREW.

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DURING CLBOUT FROM SEA; WE OBSERVED MT RANIER WAS CLR; WIND WAS BLOWING FROM THE S; AND AIR WAS SMOOTH. THEREFORE; WE ASKED FOR A MOUNTAIN TOUR. ZSE TOLD US TO CLB VFR BELOW 17500 FT TO MAINTAIN FL230; PASS TO THE S OF THE MOUNTAIN; AND WHEN THROUGH; FLY HDG 130 DEGS FOR VECTORS ON COURSE. THE TOUR WAS UNEVENTFUL; ARRIVING AT 14000 FT MSL; AS WE PASSED THE PEAK AND HDG ALMOST 130 DEGS ALREADY. FOLLOWING THE CLB; A DEADHEADING PLT REQUESTED COMING TO THE COCKPIT. HE HAD JUST GIVEN US A LINE CHK INTO SEA; SO WE ALLOWED HIM IN. HE EXPRESSED SURPRISE AT THE PROX OF THE MOUNTAIN; AND STATED IT HAD FRIGHTENED HIM (IN SO MANY WORDS). OUR CONCERN WAS NOT WITH THE MOUNTAIN TOUR; BUT WITH HIS ACTIONS AS WE WERE LATER INFORMED BY THE FLT ATTENDANTS. HE HAD JUMPED OUT OF HIS SEAT (WITH THE SEATBELT SIGN STILL ON); AND RUSHED TO THE REAR OF THE ACFT TO SEE HOW CLOSE THE MOUNTAIN WAS AND TO EXPRESS CONCERN TO THEM; THE FLT ATTENDANTS; HIMSELF. HE LATER TOLD US HE HAD NEVER SEEN A MOUNTAIN FLY-BY. IT SEEMS THAT HE SHOULD HAVE FOUND OUT WHAT WAS NORMAL AND WHAT WAS NOT; BEFORE ATTEMPTING TO WORRY FLT ATTENDANTS AND PAX BY DISREGARDING SEATBELT LIGHTS. SUPPLEMENTAL INFO FROM ACN 578765: A DEADHEADING CHK PLT FOR OUR COMPANY WANTED ADMISSION TO THE COCKPIT. HE FELT UNCOMFORTABLE WITH OUR FLY-BY; AND HAD LEFT HIS SEAT WITH THE SEATBELT LIGHT STILL ILLUMINATED TO OBTAIN DIFFERENT VIEWS OF THE MOUNTAIN. INSTEAD OF IGNORING THE SEATBELT SIGN AND POTENTIALLY ALARMING THE PAX; HE SHOULD HAVE KEPT HIS SEAT AND SPOKEN TO US ABOUT HIS CONCERNS LATER. WE RECEIVED THANKS FOR THE TOUR FROM MANY PAX; AS THEY DEPLANED AS IS USUALLY THE CASE WHEN I'VE DONE THIS TOUR IN THE PAST.