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DC8-63 on koyah STAR to lgb descending to 13000 ft on vector to avoid thunderstorms vicinity of dawna, encountered strong downdraft resulting in 300 ft overshoot.
| Attributes | |
| ACN | 346690 |
| Time | |
| Date | 199609 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hec airport : lgb |
| State Reference | CA |
| Altitude | msl bound lower : 12700 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | DC-8 63 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 4000 |
| ASRS Report | 346690 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 17100 flight time type : 1900 |
| ASRS Report | 346691 |
| Events | |
| Anomaly | altitude deviation : undershoot inflight encounter : weather non adherence : far non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At level off with high rate of sink in turbulence on a vector around a storm cell aircraft encountered convective activity which resulted in a 300 ft altitude deviation. A smaller descent rate would have mitigated the added effect of the convective turbulence resulting in no altitude undershoot. Supplemental information from acn 346691: ATC assigned us to cross dawna at 13000 ft with a speed of 310 KIAS or better.
Original NASA ASRS Text
Title: DC8-63 ON KOYAH STAR TO LGB DSNDING TO 13000 FT ON VECTOR TO AVOID TSTMS VICINITY OF DAWNA, ENCOUNTERED STRONG DOWNDRAFT RESULTING IN 300 FT OVERSHOOT.
Narrative: AT LEVEL OFF WITH HIGH RATE OF SINK IN TURB ON A VECTOR AROUND A STORM CELL ACFT ENCOUNTERED CONVECTIVE ACTIVITY WHICH RESULTED IN A 300 FT ALTDEV. A SMALLER DSCNT RATE WOULD HAVE MITIGATED THE ADDED EFFECT OF THE CONVECTIVE TURB RESULTING IN NO ALT UNDERSHOOT. SUPPLEMENTAL INFO FROM ACN 346691: ATC ASSIGNED US TO CROSS DAWNA AT 13000 FT WITH A SPD OF 310 KIAS OR BETTER.
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.