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A B737-400 with the leading edge forward panel lights deferred per the MEL the crew noted the stall warning indicator was lower than usual and the airspeed tape was indicating a higher speed.
| Attributes | |
| ACN | 683120 |
| Time | |
| Date | 200601 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sna.airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sna.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Route In Use | departure sid : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 683120 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 683119 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : stall warning ind other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Chart Or Publication |
Narrative:
With MEL 27-4A on aircraft X; an unusual display was observed on the flight director during the departure phase. The stall warning indicator was lower (closer to stall) than usual; and on the speed tape display the airspeed yellow/red caution band was indicating a higher airspeed. The aircraft was configured correctly; and departure weights were correct. Recommend looking into the MEL to correct the flight director display. Maybe the biasing of the stall warning or airspeed caution band inputs could be corrected to reflect actual flap/slat position.
Original NASA ASRS Text
Title: A B737-400 WITH THE LEADING EDGE FORWARD PANEL LIGHTS DEFERRED PER THE MEL THE CREW NOTED THE STALL WARNING INDICATOR WAS LOWER THAN USUAL AND THE AIRSPD TAPE WAS INDICATING A HIGHER SPD.
Narrative: WITH MEL 27-4A ON ACFT X; AN UNUSUAL DISPLAY WAS OBSERVED ON THE FLT DIRECTOR DURING THE DEP PHASE. THE STALL WARNING INDICATOR WAS LOWER (CLOSER TO STALL) THAN USUAL; AND ON THE SPD TAPE DISPLAY THE AIRSPD YELLOW/RED CAUTION BAND WAS INDICATING A HIGHER AIRSPD. THE ACFT WAS CONFIGURED CORRECTLY; AND DEP WTS WERE CORRECT. RECOMMEND LOOKING INTO THE MEL TO CORRECT THE FLT DIRECTOR DISPLAY. MAYBE THE BIASING OF THE STALL WARNING OR AIRSPD CAUTION BAND INPUTS COULD BE CORRECTED TO REFLECT ACTUAL FLAP/SLAT POS.
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.