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ATC volunteers that small aircraft has a cell at 12 O'clock and offers a vector. Small aircraft overshoots assigned altitude.
| Attributes | |
| ACN | 267425 |
| Time | |
| Date | 199403 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : cgt airport : 3ck |
| State Reference | IL |
| Altitude | msl bound lower : 2500 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tracon : ord |
| Operator | general aviation : instructional |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot instruction : instructor |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 50 flight time total : 550 flight time type : 100 |
| ASRS Report | 267425 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : trainee |
| Qualification | pilot : private |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In IMC we experienced increasing turbulence. A few seconds later, precipitation started with increasing intensity. Called ZAU asked for and received clearance to 3000 ft to preclude the possibility of ice. Center quickly came back and advised us to switch to chicago approach because 'they have better radar for cells.' as we were descending, I contacted approach immediately, he suggested a heading of 270 (from 350 ft) as he showed a level 2 just north of us. We immediately initiated a left turn as we continued our descent. Turbulence and precipitation were now moderate-severe and very heavy. At this time I was uncomfortable that 270 degrees was going to help us away from the cell and so I asked for a 180 degree back away from it. As I radioed controller, we were just passing through 3300-3400 MSL. He approved our request immediately and so we commenced our left turn 180 degrees through very heavy turbulence. Approximately midway through the turn, I scanned the gauges and saw the altimeter racing past 3000 ft and vsi nearly pegged. Even with full power applied, the severe down draft forced the aircraft to 2500 MSL before stopping and then even though we had climb power and airspeed, immediate corrective action was taken. Chicago approach vectored us around this cell and flight proceeded without incident.
Original NASA ASRS Text
Title: ATC VOLUNTEERS THAT SMA HAS A CELL AT 12 O'CLOCK AND OFFERS A VECTOR. SMA OVERSHOOTS ASSIGNED ALT.
Narrative: IN IMC WE EXPERIENCED INCREASING TURB. A FEW SECONDS LATER, PRECIPITATION STARTED WITH INCREASING INTENSITY. CALLED ZAU ASKED FOR AND RECEIVED CLRNC TO 3000 FT TO PRECLUDE THE POSSIBILITY OF ICE. CTR QUICKLY CAME BACK AND ADVISED US TO SWITCH TO CHICAGO APCH BECAUSE 'THEY HAVE BETTER RADAR FOR CELLS.' AS WE WERE DSNDING, I CONTACTED APCH IMMEDIATELY, HE SUGGESTED A HDG OF 270 (FROM 350 FT) AS HE SHOWED A LEVEL 2 JUST N OF US. WE IMMEDIATELY INITIATED A L TURN AS WE CONTINUED OUR DSCNT. TURB AND PRECIPITATION WERE NOW MODERATE-SEVERE AND VERY HVY. AT THIS TIME I WAS UNCOMFORTABLE THAT 270 DEGS WAS GOING TO HELP US AWAY FROM THE CELL AND SO I ASKED FOR A 180 DEG BACK AWAY FROM IT. AS I RADIOED CTLR, WE WERE JUST PASSING THROUGH 3300-3400 MSL. HE APPROVED OUR REQUEST IMMEDIATELY AND SO WE COMMENCED OUR L TURN 180 DEGS THROUGH VERY HVY TURB. APPROX MIDWAY THROUGH THE TURN, I SCANNED THE GAUGES AND SAW THE ALTIMETER RACING PAST 3000 FT AND VSI NEARLY PEGGED. EVEN WITH FULL PWR APPLIED, THE SEVERE DOWN DRAFT FORCED THE ACFT TO 2500 MSL BEFORE STOPPING AND THEN EVEN THOUGH WE HAD CLB PWR AND AIRSPD, IMMEDIATE CORRECTIVE ACTION WAS TAKEN. CHICAGO APCH VECTORED US AROUND THIS CELL AND FLT PROCEEDED WITHOUT INCIDENT.
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.