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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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This flight crew in medium large transport aircraft during approach did 2 consecutive gars due to microburst alerts from the tower. It was later discovered that the tower computer had a programming problem and was giving false alerts. Flcs air carrier SOP doesn't allow approachs with microburst alerts. Flight crew declared low fuel and given priority landing.
| Attributes | |
| ACN | 363469 |
| Time | |
| Date | 199703 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing : missed approach landing other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 13510 flight time type : 2005 |
| ASRS Report | 363469 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
On approach to ILS/visual runway 27L ord -- heard another aircraft on local radio when switched over at OM '+/-40 KTS on short final.' I think the aircraft ahead of us went around as I did when I heard the tower announce 'microburst alert' runway 27L and then they stated the winds at the surface. The tower changed the runway to runway 22. Winds about 230 degrees at 18 KTS gusting to 32 KTS. Got radar vector to final runway 22 and aircraft ahead of us executed a missed approach due to windshear on final -- so I refused final and executed missed approach also. On long downwind on 3RD approach, I had to declare 'minimum fuel,' and get shorter radar vector to final and a safe landing on runway 22 ord. Only +/-5 KTS on short final runway 22. I found out later that ord tower had programming problem in computer that calculates the 'microburst' alert system at the airport. For your information at my airline -- SOP -- is an automatic missed approach if microburst alert is present, ie, no approachs permitted.
Original NASA ASRS Text
Title: THIS FLC IN MLG ACFT DURING APCH DID 2 CONSECUTIVE GARS DUE TO MICROBURST ALERTS FROM THE TWR. IT WAS LATER DISCOVERED THAT THE TWR COMPUTER HAD A PROGRAMMING PROB AND WAS GIVING FALSE ALERTS. FLCS ACR SOP DOESN'T ALLOW APCHS WITH MICROBURST ALERTS. FLC DECLARED LOW FUEL AND GIVEN PRIORITY LNDG.
Narrative: ON APCH TO ILS/VISUAL RWY 27L ORD -- HEARD ANOTHER ACFT ON LCL RADIO WHEN SWITCHED OVER AT OM '+/-40 KTS ON SHORT FINAL.' I THINK THE ACFT AHEAD OF US WENT AROUND AS I DID WHEN I HEARD THE TWR ANNOUNCE 'MICROBURST ALERT' RWY 27L AND THEN THEY STATED THE WINDS AT THE SURFACE. THE TWR CHANGED THE RWY TO RWY 22. WINDS ABOUT 230 DEGS AT 18 KTS GUSTING TO 32 KTS. GOT RADAR VECTOR TO FINAL RWY 22 AND ACFT AHEAD OF US EXECUTED A MISSED APCH DUE TO WINDSHEAR ON FINAL -- SO I REFUSED FINAL AND EXECUTED MISSED APCH ALSO. ON LONG DOWNWIND ON 3RD APCH, I HAD TO DECLARE 'MINIMUM FUEL,' AND GET SHORTER RADAR VECTOR TO FINAL AND A SAFE LNDG ON RWY 22 ORD. ONLY +/-5 KTS ON SHORT FINAL RWY 22. I FOUND OUT LATER THAT ORD TWR HAD PROGRAMMING PROB IN COMPUTER THAT CALCULATES THE 'MICROBURST' ALERT SYS AT THE ARPT. FOR YOUR INFO AT MY AIRLINE -- SOP -- IS AN AUTOMATIC MISSED APCH IF MICROBURST ALERT IS PRESENT, IE, NO APCHS PERMITTED.
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.