Narrative:

We departed ZZZ1 en route to ZZZ with 4000 pounds of fuel aboard at XA46 EDT. Operations were normal until just south of ZZZ2. We were handed off to ZZZ approach control. We asked for runway 17 due to the south winds and shorter distance. ATC advised that there were level 4 thunderstorms on the ILS runway 17 final, although our WX radar did not indicate any significant returns. ATC recommended ILS runway 26, and we accepted. ATC stated they were vectoring us between 2 cells, and we told them that their radar was better than ours, so they should continue. The RVR on runway 26 went below minimums before the FAF, so we accepted vectors to runway 27R at ZZZ. After the FAF on runway 27R, we encountered a significant windshear of -40 KTS and initiated a missed approach. As we missed the approach, the landing gear doors did not close properly. We encountered significant turbulence on the turn to the southeast and so continued the turn to a 090 degree heading. We then encountered an updraft that precluded me from leveling off at 2000 ft MSL. ATC approved 3000 ft MSL and the 090 degree heading. We believed that our 'out' was to the east. We felt that ZZZ3, our published alternate airport, was beyond reach due to the WX and did not want to fly north due to the known level 4 cells there and did not want to go south due to the significant turbulence. We checked the ZZZ4 WX, and it was acceptable. We advised ZZZ operations of our decision to proceed to ZZZ4 and asked that they advise dispatch. They did so. We resolved the landing gear problem using the emergency checklist, and spoke to the flight attendant and the passenger. We monitored XXX. XXX on the #2 radio and did not receive any calls. Upon arrival at ZZZ4, ATC slipped us between arrs, and we flew a 10 mi final utilizing the ILS runway 22. We landed with 2300 pounds of fuel at XC33 EDT. We wrote up the WX radar as being marginal and wrote up the landing gear for not retracting properly.

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Original NASA ASRS Text

Title: A DEHAVILLAND -8 MADE A MISSED APCH AND DIVERTED DUE TO TSTM ACTIVITY AND WINDSHEAR. A FAILED WX RADAR WAS DECIDING FACTOR TO DIVERT.

Narrative: WE DEPARTED ZZZ1 ENRTE TO ZZZ WITH 4000 LBS OF FUEL ABOARD AT XA46 EDT. OPS WERE NORMAL UNTIL JUST S OF ZZZ2. WE WERE HANDED OFF TO ZZZ APCH CTL. WE ASKED FOR RWY 17 DUE TO THE S WINDS AND SHORTER DISTANCE. ATC ADVISED THAT THERE WERE LEVEL 4 TSTMS ON THE ILS RWY 17 FINAL, ALTHOUGH OUR WX RADAR DID NOT INDICATE ANY SIGNIFICANT RETURNS. ATC RECOMMENDED ILS RWY 26, AND WE ACCEPTED. ATC STATED THEY WERE VECTORING US BTWN 2 CELLS, AND WE TOLD THEM THAT THEIR RADAR WAS BETTER THAN OURS, SO THEY SHOULD CONTINUE. THE RVR ON RWY 26 WENT BELOW MINIMUMS BEFORE THE FAF, SO WE ACCEPTED VECTORS TO RWY 27R AT ZZZ. AFTER THE FAF ON RWY 27R, WE ENCOUNTERED A SIGNIFICANT WINDSHEAR OF -40 KTS AND INITIATED A MISSED APCH. AS WE MISSED THE APCH, THE LNDG GEAR DOORS DID NOT CLOSE PROPERLY. WE ENCOUNTERED SIGNIFICANT TURB ON THE TURN TO THE SE AND SO CONTINUED THE TURN TO A 090 DEG HDG. WE THEN ENCOUNTERED AN UPDRAFT THAT PRECLUDED ME FROM LEVELING OFF AT 2000 FT MSL. ATC APPROVED 3000 FT MSL AND THE 090 DEG HDG. WE BELIEVED THAT OUR 'OUT' WAS TO THE E. WE FELT THAT ZZZ3, OUR PUBLISHED ALTERNATE ARPT, WAS BEYOND REACH DUE TO THE WX AND DID NOT WANT TO FLY N DUE TO THE KNOWN LEVEL 4 CELLS THERE AND DID NOT WANT TO GO S DUE TO THE SIGNIFICANT TURB. WE CHKED THE ZZZ4 WX, AND IT WAS ACCEPTABLE. WE ADVISED ZZZ OPS OF OUR DECISION TO PROCEED TO ZZZ4 AND ASKED THAT THEY ADVISE DISPATCH. THEY DID SO. WE RESOLVED THE LNDG GEAR PROB USING THE EMER CHKLIST, AND SPOKE TO THE FLT ATTENDANT AND THE PAX. WE MONITORED XXX. XXX ON THE #2 RADIO AND DID NOT RECEIVE ANY CALLS. UPON ARR AT ZZZ4, ATC SLIPPED US BTWN ARRS, AND WE FLEW A 10 MI FINAL UTILIZING THE ILS RWY 22. WE LANDED WITH 2300 LBS OF FUEL AT XC33 EDT. WE WROTE UP THE WX RADAR AS BEING MARGINAL AND WROTE UP THE LNDG GEAR FOR NOT RETRACTING PROPERLY.

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.