Narrative:

I was the PIC and the PF from the right seat of a king air be-B200 during landing at west chester (brandywine, N99), PA. The WX was slightly above VOR minimums so we decided to fly a VOR approach to the runway. (There is no localizer available.) we acquired the runway environment and transitioned to visual references for the landing. We landed slightly long and slightly fast, but not so long or fast as to be concerned. We brought the aircraft to taxi speed using ordinary procedures, taxied to parking and shut down. Upon our postflt visual inspection, we noticed the main gear tires appeared to be flat. (There are 2 wheels on each main landing gear.) upon closer inspection, both outboard tires were flat-spotted and deflated, while both inboard tires were still inflated. There was no other damage to the aircraft. We called maintenance and they dispatched a maintenance crew to inspect and replace the tires. The maintenance crew confirmed the inboard tires were still inflated and ok, but the outboard tires needed to be changed. They did so and released the aircraft to fly. In trying to understand why the 2 outboard tires had been flat-spotted, I believe they were somehow subject to more braking forces than the inboard tires were. I can only believe that perhaps I 'jumped on' the brakes too hard initially, because there was nothing unusual about the remainder of the runway rollout after landing, and we slowed to taxi speed with approximately 1000 ft of runway remaining. We did not feel or hear anything during the rollout or taxi to parking. I'm glad a postflt visual inspection is in my habit pattern.

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Original NASA ASRS Text

Title: A KING AIR FLT CREW DETECTED AFTER LNDG THAT THE 2 OUTBOARD TIRES HAD DEFLATED ON LNDG.

Narrative: I WAS THE PIC AND THE PF FROM THE R SEAT OF A KING AIR BE-B200 DURING LNDG AT WEST CHESTER (BRANDYWINE, N99), PA. THE WX WAS SLIGHTLY ABOVE VOR MINIMUMS SO WE DECIDED TO FLY A VOR APCH TO THE RWY. (THERE IS NO LOC AVAILABLE.) WE ACQUIRED THE RWY ENVIRONMENT AND TRANSITIONED TO VISUAL REFS FOR THE LNDG. WE LANDED SLIGHTLY LONG AND SLIGHTLY FAST, BUT NOT SO LONG OR FAST AS TO BE CONCERNED. WE BROUGHT THE ACFT TO TAXI SPD USING ORDINARY PROCS, TAXIED TO PARKING AND SHUT DOWN. UPON OUR POSTFLT VISUAL INSPECTION, WE NOTICED THE MAIN GEAR TIRES APPEARED TO BE FLAT. (THERE ARE 2 WHEELS ON EACH MAIN LNDG GEAR.) UPON CLOSER INSPECTION, BOTH OUTBOARD TIRES WERE FLAT-SPOTTED AND DEFLATED, WHILE BOTH INBOARD TIRES WERE STILL INFLATED. THERE WAS NO OTHER DAMAGE TO THE ACFT. WE CALLED MAINT AND THEY DISPATCHED A MAINT CREW TO INSPECT AND REPLACE THE TIRES. THE MAINT CREW CONFIRMED THE INBOARD TIRES WERE STILL INFLATED AND OK, BUT THE OUTBOARD TIRES NEEDED TO BE CHANGED. THEY DID SO AND RELEASED THE ACFT TO FLY. IN TRYING TO UNDERSTAND WHY THE 2 OUTBOARD TIRES HAD BEEN FLAT-SPOTTED, I BELIEVE THEY WERE SOMEHOW SUBJECT TO MORE BRAKING FORCES THAN THE INBOARD TIRES WERE. I CAN ONLY BELIEVE THAT PERHAPS I 'JUMPED ON' THE BRAKES TOO HARD INITIALLY, BECAUSE THERE WAS NOTHING UNUSUAL ABOUT THE REMAINDER OF THE RWY ROLLOUT AFTER LNDG, AND WE SLOWED TO TAXI SPD WITH APPROX 1000 FT OF RWY REMAINING. WE DID NOT FEEL OR HEAR ANYTHING DURING THE ROLLOUT OR TAXI TO PARKING. I'M GLAD A POSTFLT VISUAL INSPECTION IS IN MY HABIT PATTERN.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.