Narrative:

Jac; is at 6451 foot elevation with a 6300 foot runway. Touchdown was in the first 500 feet; firm as planned. On landing rollout with braking action reported good and autobrakes set to maximum automatic; we encountered patchy ice and fair braking action. The port; left truck; forward right tire; tire 2; blew about halfway down the runway during heavy anti-skid cycling. We were at taxi speed with 2000 feet remaining. We did not know the tire had blown until we parked. A ramper had heard the tire blow and advised us of the blown tire. The tire looked like it hit a patch of dry concrete with the brake applied and skid until it blew. The left front tire also had a bald skid spot but did not blow. Both tires were replaced and the anti-skid system was extensively tested with no faults noted. I have two concerns. First; accuracy and consistency of braking action reports are a significant problem; especially at limited use airports like jac and guc; gunnison; co. The only accurate reports are from pilot reports (PIREPS). The vehicle mu reports have been inaccurate in both directions. For instance; recently guc reported poor braking action from their operations vehicle while a pilot reported fair: it was fair. The night of our blown tire at jac the braking action was reported good with a dry runway and we encountered patchy ice and fair braking action. Second; after speaking to the mechanic who changed the tires and tested the anti-skid; I had the impression that maintenance is aware of anti-skid problem on runways with patch ice where the tires are rapidly passing over ice and then clear; dry concrete.callback conversation with reporter revealed the following information: the reporter stated the field condition reporting at most airports appears to be somewhat subjective and variable depending on the current traffic requirements. In the case of the B757; there may also be an antiskid anomaly that makes this aircraft's brakes subject to locking wheels up on runways with patchy ice as was the case here. The combination of an inaccurate braking action and a potential B757 antiskid brake problem poses a risk on icy runways.

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Original NASA ASRS Text

Title: A B757 PILOT REPORTS INACCURATE BRAKING ACTION REPORTS FROM JAC AIRPORT PERSONNEL. ACTUAL BRAKING ACTION WAS FAIR WHEN GOOD WAS REPORTED. ANTISKID ACTION CAUSED A TIRE FAILURE.

Narrative: JAC; IS AT 6451 FOOT ELEVATION WITH A 6300 FOOT RUNWAY. TOUCHDOWN WAS IN THE FIRST 500 FEET; FIRM AS PLANNED. ON LANDING ROLLOUT WITH BRAKING ACTION REPORTED GOOD AND AUTOBRAKES SET TO MAX AUTO; WE ENCOUNTERED PATCHY ICE AND FAIR BRAKING ACTION. THE PORT; LEFT TRUCK; FORWARD RIGHT TIRE; TIRE 2; BLEW ABOUT HALFWAY DOWN THE RUNWAY DURING HEAVY ANTI-SKID CYCLING. WE WERE AT TAXI SPEED WITH 2000 FEET REMAINING. WE DID NOT KNOW THE TIRE HAD BLOWN UNTIL WE PARKED. A RAMPER HAD HEARD THE TIRE BLOW AND ADVISED US OF THE BLOWN TIRE. THE TIRE LOOKED LIKE IT HIT A PATCH OF DRY CONCRETE WITH THE BRAKE APPLIED AND SKID UNTIL IT BLEW. THE LEFT FRONT TIRE ALSO HAD A BALD SKID SPOT BUT DID NOT BLOW. BOTH TIRES WERE REPLACED AND THE ANTI-SKID SYSTEM WAS EXTENSIVELY TESTED WITH NO FAULTS NOTED. I HAVE TWO CONCERNS. FIRST; ACCURACY AND CONSISTENCY OF BRAKING ACTION REPORTS ARE A SIGNIFICANT PROBLEM; ESPECIALLY AT LIMITED USE AIRPORTS LIKE JAC AND GUC; GUNNISON; CO. THE ONLY ACCURATE REPORTS ARE FROM PILOT REPORTS (PIREPS). THE VEHICLE MU REPORTS HAVE BEEN INACCURATE IN BOTH DIRECTIONS. FOR INSTANCE; RECENTLY GUC REPORTED POOR BRAKING ACTION FROM THEIR OPS VEHICLE WHILE A PILOT REPORTED FAIR: IT WAS FAIR. THE NIGHT OF OUR BLOWN TIRE AT JAC THE BRAKING ACTION WAS REPORTED GOOD WITH A DRY RUNWAY AND WE ENCOUNTERED PATCHY ICE AND FAIR BRAKING ACTION. SECOND; AFTER SPEAKING TO THE MECHANIC WHO CHANGED THE TIRES AND TESTED THE ANTI-SKID; I HAD THE IMPRESSION THAT MAINT IS AWARE OF ANTI-SKID PROBLEM ON RUNWAYS WITH PATCH ICE WHERE THE TIRES ARE RAPIDLY PASSING OVER ICE AND THEN CLEAR; DRY CONCRETE.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THE FIELD CONDITION REPORTING AT MOST AIRPORTS APPEARS TO BE SOMEWHAT SUBJECTIVE AND VARIABLE DEPENDING ON THE CURRENT TRAFFIC REQUIREMENTS. IN THE CASE OF THE B757; THERE MAY ALSO BE AN ANTISKID ANOMALY THAT MAKES THIS AIRCRAFT'S BRAKES SUBJECT TO LOCKING WHEELS UP ON RUNWAYS WITH PATCHY ICE AS WAS THE CASE HERE. THE COMBINATION OF AN INACCURATE BRAKING ACTION AND A POTENTIAL B757 ANTISKID BRAKE PROBLEM POSES A RISK ON ICY RUNWAYS.

Data retrieved from NASA's ASRS site as of April 2012 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.