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Fokker 100 flight crew during final approach diverted to alternate due to thunderstorm downbursts and reported windshear.
| Attributes | |
| ACN | 549252 |
| Time | |
| Date | 200205 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl single value : 2000 |
| Environment | |
| Weather Elements | Windshear Turbulence Thunderstorm other |
| Aircraft 1 | |
| Controlling Facilities | tracon : i90.tracon tower : rdm.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : i90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 549252 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | inflight encounter : weather inflight encounter other other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory flight crew : diverted to alternate flight crew : executed go around flight crew : executed missed approach |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Environmental Factor |
| Primary Problem | Weather |
Narrative:
5-10 mi final runway 8 iah approach. After WX rerte, 25 mins of holding west of iah, we were cleared inbound to iah. Line of severe thunderstorms north to northwest of field moving south. As we lined up on runway 8, cleared for the visual, we looked down to the left and saw a huge gust front/microburst based on blowing sand and dirt, plus heavy rain/lightening approaching the north end of the field. Winds of 010 degrees at 25 KTS gusting to 33 KTS with rain. This is 13 KTS more than the crosswind limit for the F100. Immediately told tower we needed a right turnout. He said unable due to an aircraft off the right for visual runway 9. About the same time, a wind gut hit the aircraft from left to right blowing us slightly right of course. We advised the controller/tower we would have to declare an emergency for the right turnout. He told us to keep a visual on the aircraft going to runway 9. We said we could. During the breakout, we passed well below and behind the runway 9 traffic without even receiving any TCASII RA's. We were then given a heading clear of the airport and WX then cleared to our altitude (sat). Later reports of golf ball size hail in the area.
Original NASA ASRS Text
Title: FOKKER 100 FLC DURING FINAL APCH DIVERTED TO ALTERNATE DUE TO TSTM DOWNBURSTS AND RPTED WINDSHEAR.
Narrative: 5-10 MI FINAL RWY 8 IAH APCH. AFTER WX RERTE, 25 MINS OF HOLDING W OF IAH, WE WERE CLRED INBOUND TO IAH. LINE OF SEVERE TSTMS N TO NW OF FIELD MOVING S. AS WE LINED UP ON RWY 8, CLRED FOR THE VISUAL, WE LOOKED DOWN TO THE L AND SAW A HUGE GUST FRONT/MICROBURST BASED ON BLOWING SAND AND DIRT, PLUS HVY RAIN/LIGHTENING APCHING THE N END OF THE FIELD. WINDS OF 010 DEGS AT 25 KTS GUSTING TO 33 KTS WITH RAIN. THIS IS 13 KTS MORE THAN THE XWIND LIMIT FOR THE F100. IMMEDIATELY TOLD TWR WE NEEDED A R TURNOUT. HE SAID UNABLE DUE TO AN ACFT OFF THE R FOR VISUAL RWY 9. ABOUT THE SAME TIME, A WIND GUT HIT THE ACFT FROM L TO R BLOWING US SLIGHTLY R OF COURSE. WE ADVISED THE CTLR/TWR WE WOULD HAVE TO DECLARE AN EMER FOR THE R TURNOUT. HE TOLD US TO KEEP A VISUAL ON THE ACFT GOING TO RWY 9. WE SAID WE COULD. DURING THE BREAKOUT, WE PASSED WELL BELOW AND BEHIND THE RWY 9 TFC WITHOUT EVEN RECEIVING ANY TCASII RA'S. WE WERE THEN GIVEN A HDG CLR OF THE ARPT AND WX THEN CLRED TO OUR ALT (SAT). LATER RPTS OF GOLF BALL SIZE HAIL IN THE AREA.
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.