A B737-200 IN CLB AT FL210 HAD #1 ENG FLAMEOUT WITH NO RESTART. DECLARED AN EMER AND DIVERTED. CAUSE UNKNOWN.

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NORMAL DEP AND CLBOUT. APCHING FINAL ALT; FL210; #1 ENG FLAMED OUT. NO N2 INDICATION. CHKLIST FOLLOWED AND AN EMER DECLARED. PAX 122; CREW 8. LNDG WT 103000 LBS. THE FLAMEOUT OCCURRED AT THE HALFWAY POINT BTWN SAT-HOU. SINGLE ENG APCH/DSCNT; ILS RWY 12R. MAX BRAKING USED. LNDG UNEVENTFUL. EMER CANCELED AFTER LNDG. MY THANKS TO MY FO AND COCKPIT JUMP SEATERS (NAMES/NUMBERS). 1 JUMP SEATER HELPED THE FO AND THE OTHER HELPED WITH THE PERFORMANCE COMPUTER; CONTACTING DISPATCH AND BACKING ME UP ON MY DECISIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CAPT; RPTR STATED THE ENG JUST FLAMED OUT AND NO RESTART WAS POSSIBLE. THE RPTR SAID ALL ENG INDICATIONS WERE OPERATING EXCEPT THE N2 INDICATOR WHICH STAYED AT ZERO AND APPEARED THE N2 ROTOR HAD SEIZED. THE RPTR STATED ON THE GND THE N2 ROTOR WAS FREE AND TURNED SMOOTHLY. THE RPTR SAID MAINT ADVISED THE CREW THIS ENG WAS A SCHEDULED ENGINE CHANGE FOR THE MIDNIGHT SHIFT. FO; THE RPTR STATED ON CLB AT FL210 THE ENG FLAMED OUT WITH NO RESTART. THE RPTR SAID NO DETAILS OF THE CAUSE OF THE FLAMEOUT WERE RELEASED BY MAINT.