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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A DC9-30 on approach at 7000 ft experienced an uncommanded roll when the leading edge slats were extended caused by a failed slat anti-ice tee duct jammed under the slat.
| Attributes | |
| ACN | 443496 |
| Time | |
| Date | 199907 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : day.airport |
| State Reference | OH |
| Altitude | msl single value : 7000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : day.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : cfi pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 70 flight time total : 12000 flight time type : 4000 |
| ASRS Report | 443496 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : regained aircraft control flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
During approach at 7000 ft, extended slats and experienced roll to the left. Slat disagreement light remained illuminated. Performed checklist procedure and landed with slats retracted and flaps at 50 degrees. Callback conversation with reporter revealed the following information: the reporter stated the cause of the uncommanded roll was the failure of a leading edge slat anti-ice tee duct separating and jamming under the slat.
Original NASA ASRS Text
Title: A DC9-30 ON APCH AT 7000 FT EXPERIENCED AN UNCOMMANDED ROLL WHEN THE LEADING EDGE SLATS WERE EXTENDED CAUSED BY A FAILED SLAT ANTI-ICE TEE DUCT JAMMED UNDER THE SLAT.
Narrative: DURING APCH AT 7000 FT, EXTENDED SLATS AND EXPERIENCED ROLL TO THE L. SLAT DISAGREEMENT LIGHT REMAINED ILLUMINATED. PERFORMED CHKLIST PROC AND LANDED WITH SLATS RETRACTED AND FLAPS AT 50 DEGS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE UNCOMMANDED ROLL WAS THE FAILURE OF A LEADING EDGE SLAT ANTI-ICE TEE DUCT SEPARATING AND JAMMING UNDER THE SLAT.
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.