 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B757 captain reported a leading edge slat disagree light during cruise on a test flight.
| Attributes | |
| ACN | 1519039 |
| Time | |
| Date | 201411 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Leading Edge Slat |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
During flight test of [a] B757; cruise altitude FL380; we saw the flap gauge flicker between 0 and 1. Did it again but stayed in the intermediate position followed by a leading edge slat disagree light and EICAS message. Slowed airplane down and got a descent to FL190 to figure out the problem at 210kts to be below any flap limitations. There were no roll or unusual flight control issues. Ran and complied with the QRH checklist; and since it was a flight control/nonstandard approach procedure [we advised ATC] and returned to [departure airport]. No issues or hot brakes during or after landing. Had fire department check brakes; they followed us in with no problems.maintenance thinks it is a malfunction of a relay in the leading edge system. Number 2 FCU (flap control unit) showed faults in system; I don't have all of the details.
Original NASA ASRS Text
Title: B757 Captain reported a leading edge slat disagree light during cruise on a test flight.
Narrative: During flight test of [a] B757; cruise altitude FL380; we saw the flap gauge flicker between 0 and 1. Did it again but stayed in the intermediate position followed by a Leading Edge Slat disagree light and EICAS message. Slowed airplane down and got a descent to FL190 to figure out the problem at 210kts to be below any flap limitations. There were no roll or unusual flight control issues. Ran and complied with the QRH checklist; and since it was a flight control/nonstandard approach procedure [we advised ATC] and returned to [departure airport]. No issues or hot brakes during or after landing. Had Fire Department check brakes; they followed us in with no problems.Maintenance thinks it is a malfunction of a relay in the leading edge system. Number 2 FCU (Flap Control Unit) showed faults in system; I don't have all of the details.
Data retrieved from NASA's ASRS site 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.