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A B737-300 crew fights an uncontrolled rolling motion from 1500 ft to 300 ft MSL on ILS approach to iah, tx.
| Attributes | |
| ACN | 440001 |
| Time | |
| Date | 199906 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl bound lower : 300 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : iah.tower tower : gso.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 9500 flight time type : 3000 |
| ASRS Report | 440001 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : unable |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
While on ILS approach to runway 26 in iah, between approximately 1500 and 100 ft, the flight crew experienced 3 separate series of left/right rolls, each series lasting approximately 5-10 seconds and each consisting of angles of bank up to 10 degrees. Pilot input to counter or stop the rolling motion was ineffective. Rolling motion was not initiated by pilot input. Aircraft was fully configured for landing throughout and approach was stable.
Original NASA ASRS Text
Title: A B737-300 CREW FIGHTS AN UNCTLED ROLLING MOTION FROM 1500 FT TO 300 FT MSL ON ILS APCH TO IAH, TX.
Narrative: WHILE ON ILS APCH TO RWY 26 IN IAH, BTWN APPROX 1500 AND 100 FT, THE FLC EXPERIENCED 3 SEPARATE SERIES OF L/R ROLLS, EACH SERIES LASTING APPROX 5-10 SECONDS AND EACH CONSISTING OF ANGLES OF BANK UP TO 10 DEGS. PLT INPUT TO COUNTER OR STOP THE ROLLING MOTION WAS INEFFECTIVE. ROLLING MOTION WAS NOT INITIATED BY PLT INPUT. ACFT WAS FULLY CONFIGURED FOR LNDG THROUGHOUT AND APCH WAS STABLE.
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.