BROKEN AFT CABIN JUMPSEAT ON A FULL B737-300 REQUIRES THE LNDG TO BE MADE WITH 2 AFT CABIN ATTENDANTS IN COCKPIT OBSERVER SEATS.

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WE RECEIVED A CALL FROM THE B FLT ATTENDANT. SHE INFORMED US THAT THE AFT FLT ATTENDANT JUMPSEAT HAD BROKEN AND WAS NOW UNINHABITABLE AND UNSAFE TO OCCUPY. APPARENTLY IT HAD COME OFF OF A SUPPORT MECHANISM AND WAS LEANING AT A STEEP ANGLE TOWARD THE FLOOR. FOR THIS FLT WE HAD 137 PAX; 3 FLT ATTENDANTS; AND 1 RIDER ON THE 4TH FLT ATTENDANT JUMPSEAT. WE QUERIED IF THE JUMPSEAT WOULD BE SAFE TO OCCUPY FOR LNDG. THEY ALL AGREED THAT IT WOULD NOT BE SAFE. THE FO AND I DISCUSSED HAVING THE B ATTENDANT AND 4TH RIDER SIT IN THE COCKPIT JUMPSEATS FOR LNDG. WE BOTH FELT THAT THIS WAS THE SAFEST ALTERNATIVE. OF THE 137 PAX; THERE WERE NONE AUTH TO SIT IN THE COCKPIT. WE DECIDED TO HAVE THE B ATTENDANT AND 4TH RIDER IN THE COCKPIT FOR LNDG FOR THEIR SAFETY. I DID THINK OF THE FACT THAT IN THE EVENT OF EVAC; THERE WOULD BE NO FLT ATTENDANT AT THE REAR OF THE ACFT. HOWEVER; I FELT THAT I NEEDED TO OPT FOR THE SAFETY OF THE ATTENDANTS DURING THE LNDG AND ROLLOUT PORTION OF THE FLT. I DID NOT WANT THEM JUST HOLDING ONTO SOMETHING IN THE BACK FOR THE UNLIKELY EVENT OF AN EVAC. WE ARRIVED IN TUS UNEVENTFULLY AND THE AFT JUMPSEAT WAS DEFERRED VIA MEL. ADDITIONALLY; WE INFORMED TUS GND OPS OF OUR SIT. WE RELAYED THAT THEY NEEDED TO WAIT ON OPENING THE AFT SVC DOOR AND TO GIVE US AMPLE TIME TO DISARM THE DOOR.