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A B757-200 on approach at 3000 ft aircraft pitched down. Disconnected autoplt. Found pitot-static instruments unreliable.
| Attributes | |
| ACN | 542317 |
| Time | |
| Date | 200203 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 3000 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 35r other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 542317 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : executed missed approach |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor Flight Crew Human Performance Weather |
| Primary Problem | Environmental Factor |
Narrative:
On final to ZZZ runway 35C, aircraft pitched down and accelerated. Disengaged autoplt, but aircraft pitot-static instruments were unreliable. While attempting to descend at idle thrust, gear down, flaps 25 degrees, and full speed brakes, vsi read 2300 FPM down with airspeed increasing. Missed approach and climbed above overcast. Did slow flight check after a few mins, ok. Shot approach to runway 31R uneventfully. Suspect pitot-static icing, but who knows. Aircraft was written up, but departed on next leg shortly thereafter.
Original NASA ASRS Text
Title: A B757-200 ON APCH AT 3000 FT ACFT PITCHED DOWN. DISCONNECTED AUTOPLT. FOUND PITOT-STATIC INSTS UNRELIABLE.
Narrative: ON FINAL TO ZZZ RWY 35C, ACFT PITCHED DOWN AND ACCELERATED. DISENGAGED AUTOPLT, BUT ACFT PITOT-STATIC INSTS WERE UNRELIABLE. WHILE ATTEMPTING TO DSND AT IDLE THRUST, GEAR DOWN, FLAPS 25 DEGS, AND FULL SPD BRAKES, VSI READ 2300 FPM DOWN WITH AIRSPD INCREASING. MISSED APCH AND CLBED ABOVE OVCST. DID SLOW FLT CHK AFTER A FEW MINS, OK. SHOT APCH TO RWY 31R UNEVENTFULLY. SUSPECT PITOT-STATIC ICING, BUT WHO KNOWS. ACFT WAS WRITTEN UP, BUT DEPARTED ON NEXT LEG SHORTLY THEREAFTER.
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.