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A B737-800 captain pitot tube failed to prevent ice accumulation at FL370 resulting in the captain's altitude and airspeed disagree and eec failure to soft mode. The pitot system was replaced after this event and the third maintenance log entry.
| Attributes | |
| ACN | 1069313 |
| Time | |
| Date | 201302 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pitot/Static Ice System |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence |
Narrative:
During cruise flight at FL370 captain's airspeed and altitude disagree indicators illuminated followed by eec failure to soft mode. Suspected pitot blockage from icing; followed unreliable airspeed checklist and eec procedure in QRH and began descent to FL270. Passing through FL290 all indications returned to normal and remained that way for duration of flight.
Original NASA ASRS Text
Title: A B737-800 Captain pitot tube failed to prevent ice accumulation at FL370 resulting in the Captain's Altitude and Airspeed disagree and EEC failure to soft mode. The pitot system was replaced after this event and the third maintenance log entry.
Narrative: During cruise flight at FL370 Captain's airspeed and altitude disagree indicators illuminated followed by EEC failure to soft mode. Suspected pitot blockage from icing; followed Unreliable Airspeed checklist and EEC procedure in QRH and began descent to FL270. Passing through FL290 all indications returned to normal and remained that way for duration of flight.
Data retrieved from NASA's ASRS site as of July 2013 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.