Narrative:

On friday, december, the crew of ferry flight prepositioning to chambers field, navy norfolk began descent through significant WX for approach to chambers field. Several checks on current orf WX had been made earlier (copies of captain's log enclosed) warned of gusty winds. Chambers field ATIS, however reported steady winds only at 20 KTS, and the final gca controller reported steady winds only at 16 KTS. Based upon these 2 most current WX reports for destination (ngu), a standard vref additive of 10 KTS was used for final approach. At approximately 50' AGL there was a sudden wing rise (left wing) up 30 degree or so, maybe more. I took immediate action to correct the sudden roll, and landed smoothly. After parking the aircraft, the onboard mechanic noted the scrape under engine #1 on his post-flight inspection. The WX continued to deteriorate, rapid changes in direction and speed (010 degree to 80 degree, 28 to 38 KTS), with rain, sleet, ice pellets, etc. Departure (by another crew) was delayed 12 hours--WX. Subsequently, suspecting inaccuracies in the reported WX, I called the base WX station who confirmed my suspicions: actual WX at time of landing was a sudden pressure drop, gale warnings, possible wind shear and gusty winds to 38 KTS. This heavy transport is not as responsive to roll changes inputs as more modern aircraft, and has an 8 degree limit for ground contact. Conclusion: horizontal wind shear caused by rapidly changing WX conditions.

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Original NASA ASRS Text

Title: ACR HVT LEFT ENGINE POD SCRAPED ON LNDG.

Narrative: ON FRIDAY, DECEMBER, THE CREW OF FERRY FLT PREPOSITIONING TO CHAMBERS FIELD, NAVY NORFOLK BEGAN DSCNT THROUGH SIGNIFICANT WX FOR APCH TO CHAMBERS FIELD. SEVERAL CHECKS ON CURRENT ORF WX HAD BEEN MADE EARLIER (COPIES OF CAPT'S LOG ENCLOSED) WARNED OF GUSTY WINDS. CHAMBERS FIELD ATIS, HOWEVER REPORTED STEADY WINDS ONLY AT 20 KTS, AND THE FINAL GCA CTLR REPORTED STEADY WINDS ONLY AT 16 KTS. BASED UPON THESE 2 MOST CURRENT WX REPORTS FOR DEST (NGU), A STANDARD VREF ADDITIVE OF 10 KTS WAS USED FOR FINAL APCH. AT APPROX 50' AGL THERE WAS A SUDDEN WING RISE (LEFT WING) UP 30 DEG OR SO, MAYBE MORE. I TOOK IMMEDIATE ACTION TO CORRECT THE SUDDEN ROLL, AND LANDED SMOOTHLY. AFTER PARKING THE ACFT, THE ONBOARD MECHANIC NOTED THE SCRAPE UNDER ENGINE #1 ON HIS POST-FLT INSPECTION. THE WX CONTINUED TO DETERIORATE, RAPID CHANGES IN DIRECTION AND SPEED (010 DEG TO 80 DEG, 28 TO 38 KTS), WITH RAIN, SLEET, ICE PELLETS, ETC. DEP (BY ANOTHER CREW) WAS DELAYED 12 HRS--WX. SUBSEQUENTLY, SUSPECTING INACCURACIES IN THE REPORTED WX, I CALLED THE BASE WX STATION WHO CONFIRMED MY SUSPICIONS: ACTUAL WX AT TIME OF LNDG WAS A SUDDEN PRESSURE DROP, GALE WARNINGS, POSSIBLE WIND SHEAR AND GUSTY WINDS TO 38 KTS. THIS HVT IS NOT AS RESPONSIVE TO ROLL CHANGES INPUTS AS MORE MODERN ACFT, AND HAS AN 8 DEG LIMIT FOR GND CONTACT. CONCLUSION: HORIZONTAL WIND SHEAR CAUSED BY RAPIDLY CHANGING WX CONDITIONS.

Data retrieved from NASA's ASRS site as of August 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.