 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Trailing edge flaps disagree message on approach to a high altitude; short runway airport requires a diversion to an airport with a longer runway and command decision to retract flaps partially due to fuel and airspeed constraints.
| Attributes | |
| ACN | 799613 |
| Time | |
| Date | 200808 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl bound lower : 9000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach landing : go around |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 799613 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 799612 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : eicas other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency flight crew : diverted to another airport |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
On approach to ZZZ we experienced a trailing edge disagreement light after selecting 20 degrees flaps. We leveled off and began a slow climb. After passing overhead the airport we turned east then north to assess the problem and run the appropriate checklist. We determined that we would not land at ZZZ due to the runway length and reduced flap/increased approach speed. However; when we determined the distance to our diversion station; ZZZ1; we retracted the flaps to 5 degrees using the alternate system to reduce fuel burn and increase cruise speed. I took this action based on captain's emergency authority/authorized; necessary for the conditions. During our maneuvering I allowed the aircraft to overspeed the flaps 20 degrees limit speed by approximately 30 KTS. This occurred when I failed to re-engage the autothrottles along with the autoplt on climb out and then failed to properly monitor the airspeed.
Original NASA ASRS Text
Title: TRAILING EDGE FLAPS DISAGREE MSG ON APCH TO A HIGH ALT; SHORT RWY ARPT REQUIRES A DIVERSION TO AN ARPT WITH A LONGER RWY AND COMMAND DECISION TO RETRACT FLAPS PARTIALLY DUE TO FUEL AND AIRSPEED CONSTRAINTS.
Narrative: ON APCH TO ZZZ WE EXPERIENCED A TRAILING EDGE DISAGREEMENT LIGHT AFTER SELECTING 20 DEGS FLAPS. WE LEVELED OFF AND BEGAN A SLOW CLB. AFTER PASSING OVERHEAD THE ARPT WE TURNED E THEN N TO ASSESS THE PROB AND RUN THE APPROPRIATE CHKLIST. WE DETERMINED THAT WE WOULD NOT LAND AT ZZZ DUE TO THE RWY LENGTH AND REDUCED FLAP/INCREASED APCH SPD. HOWEVER; WHEN WE DETERMINED THE DISTANCE TO OUR DIVERSION STATION; ZZZ1; WE RETRACTED THE FLAPS TO 5 DEGS USING THE ALTERNATE SYS TO REDUCE FUEL BURN AND INCREASE CRUISE SPD. I TOOK THIS ACTION BASED ON CAPT'S EMER AUTH; NECESSARY FOR THE CONDITIONS. DURING OUR MANEUVERING I ALLOWED THE ACFT TO OVERSPEED THE FLAPS 20 DEGS LIMIT SPD BY APPROX 30 KTS. THIS OCCURRED WHEN I FAILED TO RE-ENGAGE THE AUTOTHROTTLES ALONG WITH THE AUTOPLT ON CLBOUT AND THEN FAILED TO PROPERLY MONITOR THE AIRSPD.
Data retrieved from NASA's ASRS site as of May 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.