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A B737-800 flight crew was confronted with numerous captain's pitot/static system anomalies and warnings at FL370. During the subsequent descent to exit rvsm all systems returned to normal. Maintenance replaced the captain's pitot probe; tat and the left adiru.
| Attributes | |
| ACN | 1069192 |
| Time | |
| Date | 201302 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZME.ARTCC |
| State Reference | TN |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pitot-Static System |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 14400 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence |
Narrative:
The first officer was the pilot flying with the 'B' autopilot engaged. We had been in cruise flight for approximately one hour at FL370; at night and IMC with intermittent to continuous light turbulence; OAT approximately -54 when the captain's airspeed indication began to decrease followed by multiple failure warnings including: captain's 'a/south disagree;' captain's 'altitude disagree;' thrust levers increased; master caution: and the six pack annunciated 'engine.' both eec's annunciated 'altn' and VNAV disengaged. The thrust levers moved to firewall and the upper center du annunciated 'a/T limit.' we completed immediate action items and determined we had unreliable captain's airspeed and altimeter indications. We then completed the appropriate QRH checklists. We were now unable rvsm; so advised ATC; and were cleared to descend to FL270. As we descended through FL290; all the captain's instruments returned to normal and remained normal for the duration of the flight. All probe heat indicators remained normal. A maintenance review the next day indicated they had replaced the captain's pitot probe; tat; and the left adiru.
Original NASA ASRS Text
Title: A B737-800 flight crew was confronted with numerous Captain's pitot/static system anomalies and warnings at FL370. During the subsequent descent to exit RVSM all systems returned to normal. Maintenance replaced the Captain's pitot probe; TAT and the left ADIRU.
Narrative: The First Officer was the Pilot Flying with the 'B' autopilot engaged. We had been in cruise flight for approximately one hour at FL370; at night and IMC with intermittent to continuous light turbulence; OAT approximately -54 when the Captain's airspeed indication began to decrease followed by multiple failure warnings including: Captain's 'A/S DISAGREE;' Captain's 'ALT DISAGREE;' Thrust levers increased; Master Caution: and the six pack annunciated 'ENG.' Both EEC's annunciated 'ALTN' and VNAV disengaged. The thrust levers moved to firewall and the upper center DU annunciated 'A/T LIMIT.' We completed immediate action items and determined we had unreliable Captain's airspeed and altimeter indications. We then completed the appropriate QRH checklists. We were now unable RVSM; so advised ATC; and were cleared to descend to FL270. As we descended through FL290; all the Captain's instruments returned to normal and remained normal for the duration of the flight. All probe heat indicators remained normal. A Maintenance review the next day indicated they had replaced the Captain's pitot probe; TAT; and the left ADIRU.
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.