FLT CREW OF A319 ACCEPTS LATE CHANGE TO RWY 32 VICE RWY 27 AT BOS. SUBSEQUENTLY LEARN THAT COMPANY POLICY RESTRICTED USE OF SUCH RWYS.

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WE WERE ARRIVING BOS AND ATIS WAS ADVERTISING RUNWAY 27 FOR ARRIVALS. ON HANDOFF; APPROACH CONTROL ASKED IF WE COULD ACCEPT RUNWAY 32 FOR ARRIVAL. WE REVIEWED THE AIRPORT DIAGRAM AND NOTED THE RUNWAY LENGTH AT 5;000 FEET. SINCE WE DO OPERATE INTO SIMILARLY SHORT RUNWAYS; OFTEN AS A LAST MINUTE CHANGE (RUNWAY 33 AT DCA); AND THE WIND AND RUNWAY CONDITIONS WERE FAVORABLE (STRAIGHT DOWN THE RUNWAY AT 20 KNOTS AND DRY); WE ACCEPTED THE ASSIGNMENT. I NOTED AFTERWARD THAT THE RUNWAY WAS ALSO NARROW. I RECALLED THE RECENT FLIGHT MANUAL CHANGE ADDRESSING PARAMETERS FOR OPERATIONS ON SUCH RUNWAYS. SINCE THESE PARAMETERS DEAL MAINLY WITH WIND; RUNWAY CONDITIONS AND AIRCRAFT STEERING AND BRAKING; AND SINCE NONE OF THESE WERE AN ISSUE; WE ELECTED TO CONTINUE. THE LANDING AND ROLLOUT WERE UNEVENTFUL AND THE RATE OF DECELERATION WAS SMOOTH AND COMFORTABLE; THANKS TO THE STRONG HEADWIND. MINIMAL BRAKING WAS EMPLOYED AND THERE WAS NO SUBSEQUENT HOT BRAKE. AFTERWARD; WE WERE ABLE TO REVIEW THE INFORMATION REGARDING NARROW RUNWAY OPERATIONS AND WE MET ALL OF THE CRITERIA. HOWEVER; THERE WAS A FOOTNOTE STATING THAT OPERATIONS ONTO NARROW RUNWAYS ARE NOT ROUTINE AND REQUIRE PRIOR AUTHORIZATION.