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For reasons unknown the FMS on their B737-700 dropped out of VNAV while descending on the riivr RNAV STAR; runway 24R at lax. The aircraft descended about 400 ft below the crossing restriction at minza.
| Attributes | |
| ACN | 1056550 |
| Time | |
| Date | 201212 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 171 Flight Crew Type 12000 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
[We were] cleared to descend via riivr arrival 24R. Confirmed VNAV/LNAV and started descent. [We were] given 300 KTS which was entered on the descent page. Just prior to minza; the aircraft did not level at 10;000. I stopped the descent and climbed back to 10;000. I looked at the MCP and VNAV was no longer engaged. Re-engaged VNAV and continued an uneventful approach and landing.
Original NASA ASRS Text
Title: For reasons unknown the FMS on their B737-700 dropped out of VNAV while descending on the RIIVR RNAV STAR; Runway 24R at LAX. The aircraft descended about 400 FT below the crossing restriction at MINZA.
Narrative: [We were] cleared to descend via RIIVR Arrival 24R. Confirmed VNAV/LNAV and started descent. [We were] given 300 KTS which was entered on the descent page. Just prior to MINZA; the aircraft did not level at 10;000. I stopped the descent and climbed back to 10;000. I looked at the MCP and VNAV was no longer engaged. Re-engaged VNAV and continued an uneventful approach and landing.
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.