 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
After selecting altitude intv to initiate a descent to the mdw PANGG1 RNAV sailz waypoint; a B737-800 leveled at 3;300 ft with the FMA indicating altitude hld but 3;000 ft set in both the MCP and FMC. ATC alerted the crew about the error.
| Attributes | |
| ACN | 1175026 |
| Time | |
| Date | 201405 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | MDW.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | STAR PANGG 1 RNAV |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain |
| Experience | Flight Crew Last 90 Days 372 |
| Person 2 | |
| Function | First Officer |
| Experience | Flight Crew Last 90 Days 401 Flight Crew Type 7000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Undershoot Deviation - Procedural Clearance |
Narrative:
We were cleared direct sailz and to descend and maintain 3;000 ft. We were LNAV/VNAV established and had 3;000 ft set in altitude window and 3;000 ft restriction set in CDU for sailz. We initiated a descent to 3;000 ft and the pilot not flying verified it. We did not notice the aircraft level off at 3;300 ft. ATC queried our altitude we admitted 3;300 ft and descended to 3;000 ft and were established prior to the fix. After landing; the captain of another flight came over to us. He was following us in an -800 with the same clearance and reported to us his aircraft level led off at 3;300 ft too. We suspect an -800 software issue.
Original NASA ASRS Text
Title: After selecting ALT INTV to initiate a descent to the MDW PANGG1 RNAV SAILZ waypoint; a B737-800 leveled at 3;300 FT with the FMA indicating ALT HLD but 3;000 FT set in both the MCP and FMC. ATC alerted the crew about the error.
Narrative: We were cleared direct SAILZ and to descend and maintain 3;000 FT. We were LNAV/VNAV established and had 3;000 FT set in Altitude window and 3;000 FT restriction set in CDU for SAILZ. We initiated a descent to 3;000 FT and the pilot not flying verified it. We did not notice the aircraft level off at 3;300 FT. ATC queried our altitude we admitted 3;300 FT and descended to 3;000 FT and were established prior to the fix. After landing; the Captain of another flight came over to us. He was following us in an -800 with the same clearance and reported to us his aircraft level led off at 3;300 FT too. We suspect an -800 software issue.
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.