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Advanced cockpit B737 flight crew fails to make altitude crossing restr. Altitude deviation altitude undershot in descent when the VNAV portion of their FMC disconnects. Flight crew fails to note aircraft equipment problem malfunction.
| Attributes | |
| ACN | 353166 |
| Time | |
| Date | 199611 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : clt |
| State Reference | NC |
| Altitude | msl bound lower : 11000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 240 flight time total : 15000 flight time type : 4600 |
| ASRS Report | 353166 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 15100 flight time type : 6500 |
| ASRS Report | 354022 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : published procedure non adherence : clearance other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared to clt via shine arrival, vxv transition. During descent, we were vectored on and off arrival several times, causing FMS to lose profile descent, manually reverting to vertical speed descent and return. The last clearance was direct shine to cross at 11000 ft and 250 KTS which was entered in FMC. Aircraft proceeded to shine and started profile descent. Did not notice FMA indications. Did not notice aircraft did not achieve profile (idle) descent. Crossed shine at 14000 ft and 290 KTS. Center asked what our altitude was and switched us to clt approach. Supplemental information from acn 354022: while preparing for the ILS runway 18R approach we failed to observe that the VNAV had disconnected and the flight profile had gone high. PF failed to observe profile variation on FMC descent page.
Original NASA ASRS Text
Title: ADVANCED COCKPIT B737 FLC FAILS TO MAKE ALT XING RESTR. ALTDEV ALT UNDERSHOT IN DSCNT WHEN THE VNAV PORTION OF THEIR FMC DISCONNECTS. FLC FAILS TO NOTE ACFT EQUIP PROB MALFUNCTION.
Narrative: CLRED TO CLT VIA SHINE ARR, VXV TRANSITION. DURING DSCNT, WE WERE VECTORED ON AND OFF ARR SEVERAL TIMES, CAUSING FMS TO LOSE PROFILE DSCNT, MANUALLY REVERTING TO VERT SPD DSCNT AND RETURN. THE LAST CLRNC WAS DIRECT SHINE TO CROSS AT 11000 FT AND 250 KTS WHICH WAS ENTERED IN FMC. ACFT PROCEEDED TO SHINE AND STARTED PROFILE DSCNT. DID NOT NOTICE FMA INDICATIONS. DID NOT NOTICE ACFT DID NOT ACHIEVE PROFILE (IDLE) DSCNT. CROSSED SHINE AT 14000 FT AND 290 KTS. CTR ASKED WHAT OUR ALT WAS AND SWITCHED US TO CLT APCH. SUPPLEMENTAL INFO FROM ACN 354022: WHILE PREPARING FOR THE ILS RWY 18R APCH WE FAILED TO OBSERVE THAT THE VNAV HAD DISCONNECTED AND THE FLT PROFILE HAD GONE HIGH. PF FAILED TO OBSERVE PROFILE VARIATION ON FMC DSCNT PAGE.
Data retrieved from NASA's ASRS site as of July 2007 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.