 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737NG first officer reported noticing indications of a malfunctioning FMC; including inconsistent maximum altitude indications.
| Attributes | |
| ACN | 1426349 |
| Time | |
| Date | 201702 |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence |
Narrative:
Took off out of mco and climbed to FL280 where there was a bumpy ride. We checked to see if we could climb because of bumpy ride. Our max altitude was FL358. We climbed to FL340. After being at cruise for a while we noticed the airspeed would not go above .76. We looked at the cruise page and noticed our max alt was now FL328. We descended to FL320. After leveling we noticed our max alt was now FL268. We consulted with dispatch and maintenance and our charts. There appeared to be an anomaly. After a period of time the FMC appeared to operate normally. We closely monitored the airspeed the entire time and were never within 20 knots of buffet even though we had a buffet message at one point.
Original NASA ASRS Text
Title: B737NG First Officer reported noticing indications of a malfunctioning FMC; including inconsistent maximum altitude indications.
Narrative: Took off out of MCO and climbed to FL280 where there was a bumpy ride. We checked to see if we could climb because of bumpy ride. Our max altitude was FL358. We climbed to FL340. After being at cruise for a while we noticed the airspeed would not go above .76. We looked at the cruise page and noticed our max alt was now FL328. We descended to FL320. After leveling we noticed our max alt was now FL268. We consulted with dispatch and maintenance and our charts. There appeared to be an anomaly. After a period of time the FMC appeared to operate normally. We closely monitored the airspeed the entire time and were never within 20 knots of buffet even though we had a buffet message at one point.
Data retrieved from NASA's ASRS site 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.