Narrative:

Previous day jul/fri/05 was over 12 hour duty day and 7 hours 48 mins of flight time; creeping mechanical in denver. Got to cyvr 3 hours late. Delayed departure next day to get minimum rest at hotel. Went on duty at XA00. Tried to leave cyvr but experienced same hydraulic problem as previous day and returned to gate after 30 min taxi. Spent the next 7 hours working with mechanics to try to fix problem. Minimal food; no rest. Ran up engines once. Stayed on the airplane out on a hard stand all day. Was asked to ferry aircraft to denver. Took another 2 hours to get appropriate paperwork and fuel to depart. Flight to den was fine; however; by the time of arrival; was painting a storm north of the field. Was vectored to final for runway 35L. Discussed windshear precautions and added 20 KTS to reference. No windshear reported by tower. After the 500 ft call; got a windshear warning (same time tower called a microburst alert) and initiated a go around. Windshear was severe. Reported it to tower and was given go around instructions. Could barely read instruments; was attempting to turn right to a heading of 120 degrees when tower asked us to expedite turn for traffic. I told them that we were in severe windshear and 'doing the best that we can.' during cleanup of flaps; got a momentary flap limit annunciation when flaps were transitioning between 1 degree and 0 degrees; speed 240 KTS. Recovered from the windshear and leveled off. WX was not looking good at pueblo; everyone behind us at den was going around; so we requested a divert to cos. We had already agreed prior to the approach that in the event of a go around for any reason that we would divert and stop for the day. So; at this point there was not much more discussion other than where to go. Sent message to dispatch; called cos. Informed duty flight manager by phone after landing. First officer and I both agreed that we were done flying for the day and asked to be released from duty. First officer did an excellent job during the windshear recovery and subsequent diversion. Human factors: we are now so fatigued after 2 days of this that there is no way that we could fuel the airplane and safely attempt to fly even 15 mins to den. Extremely fortunate that this aircraft was empty; was a light landing weight and that we had briefed and then properly executed windshear recovery. Successful outcome and landing at cos.

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Original NASA ASRS Text

Title: B757-200 CAPT RPTS WINDSHEAR ENCOUNTER IN DEN. DIVERT TO COS.

Narrative: PREVIOUS DAY JUL/FRI/05 WAS OVER 12 HR DUTY DAY AND 7 HRS 48 MINS OF FLT TIME; CREEPING MECHANICAL IN DENVER. GOT TO CYVR 3 HRS LATE. DELAYED DEP NEXT DAY TO GET MINIMUM REST AT HOTEL. WENT ON DUTY AT XA00. TRIED TO LEAVE CYVR BUT EXPERIENCED SAME HYD PROB AS PREVIOUS DAY AND RETURNED TO GATE AFTER 30 MIN TAXI. SPENT THE NEXT 7 HRS WORKING WITH MECHS TO TRY TO FIX PROB. MINIMAL FOOD; NO REST. RAN UP ENGS ONCE. STAYED ON THE AIRPLANE OUT ON A HARD STAND ALL DAY. WAS ASKED TO FERRY ACFT TO DENVER. TOOK ANOTHER 2 HRS TO GET APPROPRIATE PAPERWORK AND FUEL TO DEPART. FLT TO DEN WAS FINE; HOWEVER; BY THE TIME OF ARR; WAS PAINTING A STORM N OF THE FIELD. WAS VECTORED TO FINAL FOR RWY 35L. DISCUSSED WINDSHEAR PRECAUTIONS AND ADDED 20 KTS TO REF. NO WINDSHEAR RPTED BY TWR. AFTER THE 500 FT CALL; GOT A WINDSHEAR WARNING (SAME TIME TWR CALLED A MICROBURST ALERT) AND INITIATED A GAR. WINDSHEAR WAS SEVERE. RPTED IT TO TWR AND WAS GIVEN GAR INSTRUCTIONS. COULD BARELY READ INSTS; WAS ATTEMPTING TO TURN R TO A HDG OF 120 DEGS WHEN TWR ASKED US TO EXPEDITE TURN FOR TFC. I TOLD THEM THAT WE WERE IN SEVERE WINDSHEAR AND 'DOING THE BEST THAT WE CAN.' DURING CLEANUP OF FLAPS; GOT A MOMENTARY FLAP LIMIT ANNUNCIATION WHEN FLAPS WERE TRANSITIONING BTWN 1 DEG AND 0 DEGS; SPD 240 KTS. RECOVERED FROM THE WINDSHEAR AND LEVELED OFF. WX WAS NOT LOOKING GOOD AT PUEBLO; EVERYONE BEHIND US AT DEN WAS GOING AROUND; SO WE REQUESTED A DIVERT TO COS. WE HAD ALREADY AGREED PRIOR TO THE APCH THAT IN THE EVENT OF A GAR FOR ANY REASON THAT WE WOULD DIVERT AND STOP FOR THE DAY. SO; AT THIS POINT THERE WAS NOT MUCH MORE DISCUSSION OTHER THAN WHERE TO GO. SENT MESSAGE TO DISPATCH; CALLED COS. INFORMED DUTY FLT MGR BY PHONE AFTER LNDG. FO AND I BOTH AGREED THAT WE WERE DONE FLYING FOR THE DAY AND ASKED TO BE RELEASED FROM DUTY. FO DID AN EXCELLENT JOB DURING THE WINDSHEAR RECOVERY AND SUBSEQUENT DIVERSION. HUMAN FACTORS: WE ARE NOW SO FATIGUED AFTER 2 DAYS OF THIS THAT THERE IS NO WAY THAT WE COULD FUEL THE AIRPLANE AND SAFELY ATTEMPT TO FLY EVEN 15 MINS TO DEN. EXTREMELY FORTUNATE THAT THIS ACFT WAS EMPTY; WAS A LIGHT LNDG WT AND THAT WE HAD BRIEFED AND THEN PROPERLY EXECUTED WINDSHEAR RECOVERY. SUCCESSFUL OUTCOME AND LNDG AT COS.

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.