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B767-300 crew had the leading edge slat disagree and then the leading edge slat asymmetry light illuminated.
| Attributes | |
| ACN | 633736 |
| Time | |
| Date | 200410 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | intersection : etnic |
| State Reference | FO |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level descent : approach |
| Route In Use | enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain observation : company check pilot oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 24000 flight time type : 4000 |
| ASRS Report | 633736 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 150 flight time total : 5000 flight time type : 2000 |
| ASRS Report | 633735 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : le slat disagree light, le slat asmy light other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At etnic intersection EICAS 'leading edge slat disagree' blinked once and then 'leading edge slat asymmetry' blinked and the flap indicator shuffled between 0-1/2 units. Min later leading edge slat asymmetry came on steady as did flaps 1/2. Acar to maintenance controller and dispatch. No roll and visual all slat up. Reviewed irregular procedure and maintenance controller concurred it was an indicator problem. 1 hour later light and flap indication normal. Landing den slow to 250 KTS leading edge slat asymmetry light back on leading edge slats locked out. Copilot ran checklist, asked ATC for 160 KTS, and full length runway 35L. Landing uneventful. Supplemental information from acn 633735: we determined this was just an indication problem, but due to asymmetry protection lockout, we had to perform a landing with the leading edge devices in the up position. The trailing edge flaps extended normally. Landed at a higher speed as per the checklist, uneventful landing ensued.
Original NASA ASRS Text
Title: B767-300 CREW HAD THE LEADING EDGE SLAT DISAGREE AND THEN THE LEADING EDGE SLAT ASYMMETRY LIGHT ILLUMINATED.
Narrative: AT ETNIC INTXN EICAS 'LEADING EDGE SLAT DISAGREE' BLINKED ONCE AND THEN 'LEADING EDGE SLAT ASYMMETRY' BLINKED AND THE FLAP INDICATOR SHUFFLED BTWN 0-1/2 UNITS. MIN LATER LEADING EDGE SLAT ASYMMETRY CAME ON STEADY AS DID FLAPS 1/2. ACAR TO MAINT CTLR AND DISPATCH. NO ROLL AND VISUAL ALL SLAT UP. REVIEWED IRREGULAR PROC AND MAINT CTLR CONCURRED IT WAS AN INDICATOR PROB. 1 HR LATER LIGHT AND FLAP INDICATION NORMAL. LNDG DEN SLOW TO 250 KTS LEADING EDGE SLAT ASYMMETRY LIGHT BACK ON LEADING EDGE SLATS LOCKED OUT. COPLT RAN CHKLIST, ASKED ATC FOR 160 KTS, AND FULL LENGTH RWY 35L. LNDG UNEVENTFUL. SUPPLEMENTAL INFO FROM ACN 633735: WE DETERMINED THIS WAS JUST AN INDICATION PROB, BUT DUE TO ASYMMETRY PROTECTION LOCKOUT, WE HAD TO PERFORM A LNDG WITH THE LEADING EDGE DEVICES IN THE UP POS. THE TRAILING EDGE FLAPS EXTENDED NORMALLY. LANDED AT A HIGHER SPD AS PER THE CHKLIST, UNEVENTFUL LNDG ENSUED.
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.