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C560 crew accepted vectors that flew them into a thunderstorm cell. They encountered severe up- and down-drafts, and turbulence. Aircraft overspd and an altitude deviation was the result.
| Attributes | |
| ACN | 593114 |
| Time | |
| Date | 200309 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pxr.vortac |
| State Reference | AZ |
| Altitude | msl bound lower : 7000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Turbulence Thunderstorm Windshear |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | common carrier : air taxi |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 8200 flight time type : 600 |
| ASRS Report | 593114 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter : turbulence non adherence : clearance non adherence : company policies non adherence : far non adherence : published procedure other anomaly other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : automation overrode flight crew controller : issued new clearance flight crew : exited adverse environment flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approaching phoenix from the west, we were given vectors to the southeast to avoid cumulo nimbus. The controller then gave us a 120 degree turn (left) to 360 degrees, a descent to 8000 ft and a frequency change. The turn took us into a cumulo nimbus where moderate turbulence was encountered. Phx then assigned another frequency change. The turbulence caused a rapid airspeed rise and an overspd warning. The overspd warning apparently masked the autoplt disconnect chime. I was dealing with the overspd while the captain was working on a third frequency change. When our attention returned to the altitude, we had descended to 7000 ft. Upon making contact on the third frequency, the captain advised of the altitude deviation and requested a lower altitude to get out of the cumulo nimbus. Luke approach assigned 6000 ft, which put us outside the WX. In retrospect, we should have declined the turn that put us into the cumulo nimbus.
Original NASA ASRS Text
Title: C560 CREW ACCEPTED VECTORS THAT FLEW THEM INTO A TSTM CELL. THEY ENCOUNTERED SEVERE UP- AND DOWN-DRAFTS, AND TURB. ACFT OVERSPD AND AN ALTDEV WAS THE RESULT.
Narrative: APCHING PHOENIX FROM THE W, WE WERE GIVEN VECTORS TO THE SE TO AVOID CUMULO NIMBUS. THE CTLR THEN GAVE US A 120 DEG TURN (L) TO 360 DEGS, A DSCNT TO 8000 FT AND A FREQ CHANGE. THE TURN TOOK US INTO A CUMULO NIMBUS WHERE MODERATE TURB WAS ENCOUNTERED. PHX THEN ASSIGNED ANOTHER FREQ CHANGE. THE TURB CAUSED A RAPID AIRSPD RISE AND AN OVERSPD WARNING. THE OVERSPD WARNING APPARENTLY MASKED THE AUTOPLT DISCONNECT CHIME. I WAS DEALING WITH THE OVERSPD WHILE THE CAPT WAS WORKING ON A THIRD FREQ CHANGE. WHEN OUR ATTN RETURNED TO THE ALT, WE HAD DSNDED TO 7000 FT. UPON MAKING CONTACT ON THE THIRD FREQ, THE CAPT ADVISED OF THE ALTDEV AND REQUESTED A LOWER ALT TO GET OUT OF THE CUMULO NIMBUS. LUKE APCH ASSIGNED 6000 FT, WHICH PUT US OUTSIDE THE WX. IN RETROSPECT, WE SHOULD HAVE DECLINED THE TURN THAT PUT US INTO THE CUMULO NIMBUS.
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.