Narrative:

Air carrier X flight was normal and uneventful until this system anomaly. WX at phl was clear; unrestr; no clouds; visibility 9999 ft/west/V calm to less than 5 KTS all day and these conditions were present during the approach. On the bojid arrival and north of the field approximately 12 mi for the airport; we were cleared for a visual approach. The approach was planned and executed in accordance with SOP's to arrive in a descending right base turn for runway 27R. During the descent at approximately 1200 ft AGL; while in the vicinity of the naval ship repair facility on the river east of phl; a .5 - 1 second flash of the predictive windshear warning 'go around windshear' occurred along with a .5 second flash of the predictive windshear warning depiction on the navigation display. There were absolutely no other indicators for actual windshear or potential windshear within the aircraft performance; from any ATC communications; or in the environment itself. No facility generated windshear warning occurred anytime during the approach. By the time I could really evaluate and/or react to the one time predictive windshear warning callout; the display returned to normal with no other indications present. The approach was continued to an uneventful landing. West/V at altitude was approximately 5 KTS and the surface west/V was reported less than 5 KTS. Rollout and taxi to the gate were uneventful. Opinion: with knowledge from previous training; I believe the predictive windshear warning system received a spurious input from some unidented microwave system from the ship yard repair facility since we were in close proximity to the ship yard. Information: we flew this same nose number to ZZZ the next morning and did not have any further predictive windshear warning occurrences with that system.

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Original NASA ASRS Text

Title: AN A319 RECEIVED A MOMENTARY PREDICTIVE WINDSHEAR WARNING ANNUNCIATION OVER THE PHL NAVAL REPAIR FACILITY ON SHORT FINAL AT 1200 FT.

Narrative: ACR X FLT WAS NORMAL AND UNEVENTFUL UNTIL THIS SYS ANOMALY. WX AT PHL WAS CLR; UNRESTR; NO CLOUDS; VISIBILITY 9999 FT/W/V CALM TO LESS THAN 5 KTS ALL DAY AND THESE CONDITIONS WERE PRESENT DURING THE APCH. ON THE BOJID ARR AND N OF THE FIELD APPROX 12 MI FOR THE ARPT; WE WERE CLRED FOR A VISUAL APCH. THE APCH WAS PLANNED AND EXECUTED IN ACCORDANCE WITH SOP'S TO ARRIVE IN A DSNDING R BASE TURN FOR RWY 27R. DURING THE DSCNT AT APPROX 1200 FT AGL; WHILE IN THE VICINITY OF THE NAVAL SHIP REPAIR FACILITY ON THE RIVER E OF PHL; A .5 - 1 SECOND FLASH OF THE PREDICTIVE WINDSHEAR WARNING 'GAR WINDSHEAR' OCCURRED ALONG WITH A .5 SECOND FLASH OF THE PREDICTIVE WINDSHEAR WARNING DEPICTION ON THE NAV DISPLAY. THERE WERE ABSOLUTELY NO OTHER INDICATORS FOR ACTUAL WINDSHEAR OR POTENTIAL WINDSHEAR WITHIN THE ACFT PERFORMANCE; FROM ANY ATC COMS; OR IN THE ENVIRONMENT ITSELF. NO FACILITY GENERATED WINDSHEAR WARNING OCCURRED ANYTIME DURING THE APCH. BY THE TIME I COULD REALLY EVALUATE AND/OR REACT TO THE ONE TIME PREDICTIVE WINDSHEAR WARNING CALLOUT; THE DISPLAY RETURNED TO NORMAL WITH NO OTHER INDICATIONS PRESENT. THE APCH WAS CONTINUED TO AN UNEVENTFUL LNDG. W/V AT ALT WAS APPROX 5 KTS AND THE SURFACE W/V WAS RPTED LESS THAN 5 KTS. ROLLOUT AND TAXI TO THE GATE WERE UNEVENTFUL. OPINION: WITH KNOWLEDGE FROM PREVIOUS TRAINING; I BELIEVE THE PREDICTIVE WINDSHEAR WARNING SYS RECEIVED A SPURIOUS INPUT FROM SOME UNIDENTED MICROWAVE SYS FROM THE SHIP YARD REPAIR FACILITY SINCE WE WERE IN CLOSE PROX TO THE SHIP YARD. INFO: WE FLEW THIS SAME NOSE NUMBER TO ZZZ THE NEXT MORNING AND DID NOT HAVE ANY FURTHER PREDICTIVE WINDSHEAR WARNING OCCURRENCES WITH THAT SYS.

Data retrieved from NASA's ASRS site as of January 2009 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.