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The flight crew was given a delay vector to accommodate slowing and descending. Turbulence was encountered in close proximity to thunderstorms provoking the pilot to inadvertently descend 400 ft through his assigned descent altitude.
| Attributes | |
| ACN | 334691 |
| Time | |
| Date | 199605 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : cyy |
| State Reference | FL |
| Altitude | msl bound lower : 9600 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mia |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| 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 |
| ASRS Report | 334691 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 334690 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : exited adverse environment flight crew : returned to intended course or assigned course flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
As the captain, I was hand flying the CYY1 arrival to mia. At approximately 26 DME east of cyy, ATC cleared us from FL220 to cross the worpp intersection (46 DME) at 10000 ft at 210 KTS. I had the first officer advise ATC we were unable to comply. ATC then gave us a right turn 170 degree vectors for descent. This placed us on course for strong thunderstorms to the south. In attempting to avoid the WX we advised ATC we needed a turn and were given a left turn to 060 degrees. Because of the intensity of WX I initiated a 40 degree bank turn. While in the turn we entered the edge of a cell. With the associated heavy precipitation, mod turbulence, bank angle and high rate of descent, I was unable to stop the descent at 10000 ft and deviated to approximately 9600 ft before returning to 10000 ft. No mention from ATC about loss of separation. Flight continued to a normal landing.
Original NASA ASRS Text
Title: THE FLC WAS GIVEN A DELAY VECTOR TO ACCOMMODATE SLOWING AND DSNDING. TURB WAS ENCOUNTERED IN CLOSE PROX TO TSTMS PROVOKING THE PLT TO INADVERTENTLY DSND 400 FT THROUGH HIS ASSIGNED DSCNT ALT.
Narrative: AS THE CAPT, I WAS HAND FLYING THE CYY1 ARR TO MIA. AT APPROX 26 DME E OF CYY, ATC CLRED US FROM FL220 TO CROSS THE WORPP INTXN (46 DME) AT 10000 FT AT 210 KTS. I HAD THE FO ADVISE ATC WE WERE UNABLE TO COMPLY. ATC THEN GAVE US A R TURN 170 DEG VECTORS FOR DSCNT. THIS PLACED US ON COURSE FOR STRONG TSTMS TO THE S. IN ATTEMPTING TO AVOID THE WX WE ADVISED ATC WE NEEDED A TURN AND WERE GIVEN A L TURN TO 060 DEGS. BECAUSE OF THE INTENSITY OF WX I INITIATED A 40 DEG BANK TURN. WHILE IN THE TURN WE ENTERED THE EDGE OF A CELL. WITH THE ASSOCIATED HVY PRECIP, MOD TURBULENCE, BANK ANGLE AND HIGH RATE OF DSCNT, I WAS UNABLE TO STOP THE DSCNT AT 10000 FT AND DEVIATED TO APPROX 9600 FT BEFORE RETURNING TO 10000 FT. NO MENTION FROM ATC ABOUT LOSS OF SEPARATION. FLT CONTINUED TO A NORMAL LNDG.
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.