Cpr flight crew overshot assigned descent altitude.

Attributes
ACN	310030
Time
Date	199507
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ffu
State Reference	UT
Altitude	msl bound lower : 16660 msl bound upper : 17000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	descent other other
Route In Use	enroute airway : zlc
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 11500 flight time type : 2600
ASRS Report	310030
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot inflight encounter : weather non adherence : clearance other anomaly other
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:

I was in left seat, PNF, and allowing copilot to fly ferry leg from crq to slc. Approaching slc we were given holding instructions to hold ffu VOR 170 degree radial south, right turns at FL200. Enter holding early to avoid thunderstorm cell over ffu VOR. Started right turn from direct entry and observed another small cell close off left wing. Advised ATC of early entry and also requested left turns in pattern to avoid cell close to r-hand pattern. ATC approved left turns in pattern and requested a good rate of descent to 17000 ft MSL to get us below other traffic. Upon approaching 17000 ft we encountered turbulence and some wind shear causing an increased sink rate through 17000 ft (about 340 ft below 17000 ft before recovering back to altitude). ATC did not make any response to altitude incursion. They were very busy with a great volume of arrival traffic. We did not advise of turbulence and windshear because of continuous communication on frequency.

Original NASA ASRS Text

Title: CPR FLC OVERSHOT ASSIGNED DSCNT ALT.

Narrative: I WAS IN L SEAT, PNF, AND ALLOWING COPLT TO FLY FERRY LEG FROM CRQ TO SLC. APCHING SLC WE WERE GIVEN HOLDING INSTRUCTIONS TO HOLD FFU VOR 170 DEG RADIAL S, R TURNS AT FL200. ENTER HOLDING EARLY TO AVOID TSTM CELL OVER FFU VOR. STARTED R TURN FROM DIRECT ENTRY AND OBSERVED ANOTHER SMALL CELL CLOSE OFF L WING. ADVISED ATC OF EARLY ENTRY AND ALSO REQUESTED L TURNS IN PATTERN TO AVOID CELL CLOSE TO R-HAND PATTERN. ATC APPROVED L TURNS IN PATTERN AND REQUESTED A GOOD RATE OF DSCNT TO 17000 FT MSL TO GET US BELOW OTHER TFC. UPON APCHING 17000 FT WE ENCOUNTERED TURB AND SOME WIND SHEAR CAUSING AN INCREASED SINK RATE THROUGH 17000 FT (ABOUT 340 FT BELOW 17000 FT BEFORE RECOVERING BACK TO ALT). ATC DID NOT MAKE ANY RESPONSE TO ALT INCURSION. THEY WERE VERY BUSY WITH A GREAT VOLUME OF ARR TFC. WE DID NOT ADVISE OF TURB AND WINDSHEAR BECAUSE OF CONTINUOUS COM ON FREQ.

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.