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B757-200 experiences leading edge slat disagree EICAS message. Flight crew runs QRH and continues to destination.
| Attributes | |
| ACN | 705802 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | msl single value : 25000 |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 705802 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : eicas |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During climb out from sfo aural caution; master caution; 'leading edge' discrete caution and EICAS message 'leading edge slat disagreement' alerted us to an unsure indication of slat position. Kept climb speed below 240 KIAS and consulted QRH for guidance. It does not specify a procedure for continued flight per southeast; but deals with the scenario playing out during approach. We decided to stay at FL250. We initiated a phone patch to maintenance. We agreed that the leading edge alternate system worked and would extinguish the lights; but should not be run continuously. We deselected leading edge alternate system; after which the EICAS/discrete cautions reappeared. We decided that continuing to ZZZ would be advisable; giving us time; a much lower landing weight; no threat to safety and the prospect of an early notification of ground personnel. Refiled route with ATC; mostly direct to ZZZ with deviations around WX. At top of descent I declared an emergency with ATC; restating the low risk; precautionary nature of the emergency. WX was not a factor. The alternate flap/slat extension procedure was used per the QRH. Landing at 203300 pounds; otherwise normal at 100 FPM at touchdown; 142K.
Original NASA ASRS Text
Title: B757-200 EXPERIENCES LEADING EDGE SLAT DISAGREE EICAS MESSAGE. FLT CREW RUNS QRH AND CONTINUES TO DEST.
Narrative: DURING CLBOUT FROM SFO AURAL CAUTION; MASTER CAUTION; 'LEADING EDGE' DISCRETE CAUTION AND EICAS MESSAGE 'LEADING EDGE SLAT DISAGREEMENT' ALERTED US TO AN UNSURE INDICATION OF SLAT POS. KEPT CLB SPD BELOW 240 KIAS AND CONSULTED QRH FOR GUIDANCE. IT DOES NOT SPECIFY A PROC FOR CONTINUED FLT PER SE; BUT DEALS WITH THE SCENARIO PLAYING OUT DURING APCH. WE DECIDED TO STAY AT FL250. WE INITIATED A PHONE PATCH TO MAINT. WE AGREED THAT THE LEADING EDGE ALTERNATE SYS WORKED AND WOULD EXTINGUISH THE LIGHTS; BUT SHOULD NOT BE RUN CONTINUOUSLY. WE DESELECTED LEADING EDGE ALTERNATE SYS; AFTER WHICH THE EICAS/DISCRETE CAUTIONS REAPPEARED. WE DECIDED THAT CONTINUING TO ZZZ WOULD BE ADVISABLE; GIVING US TIME; A MUCH LOWER LNDG WT; NO THREAT TO SAFETY AND THE PROSPECT OF AN EARLY NOTIFICATION OF GND PERSONNEL. REFILED RTE WITH ATC; MOSTLY DIRECT TO ZZZ WITH DEVS AROUND WX. AT TOP OF DSCNT I DECLARED AN EMER WITH ATC; RESTATING THE LOW RISK; PRECAUTIONARY NATURE OF THE EMER. WX WAS NOT A FACTOR. THE ALTERNATE FLAP/SLAT EXTENSION PROC WAS USED PER THE QRH. LNDG AT 203300 LBS; OTHERWISE NORMAL AT 100 FPM AT TOUCHDOWN; 142K.
Data retrieved from NASA's ASRS site as of January 2009 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.