BE1900 flight crew descends through cleared altitude approaching den.

Attributes
ACN	439710
Time
Date	199902
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl bound lower : 10300 msl bound upper : 13000
Environment
Flight Conditions	VMC Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	Starship Model 2000
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 270 flight time total : 3000 flight time type : 600
ASRS Report	439710
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : returned to original clearance
Miss Distance	horizontal : 6000 vertical : 350
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While receiving vectors, we were told to descend from 13000 ft to 11000 ft, 190 KIAS, and switch controllers. We were following traffic, and I was very concerned with our separation. The next frequency was very busy, and I was unable to check in until we had descended to 10700 ft. I believe because of the traffic ahead, I mistakenly dialed in 9000 ft instead of 11000 ft. I believe 9000 ft was a result of '190' on the speed. When our TCASII sounded, I checked in and told the controller our position and descending to 9000 ft. He told us to maintain 11000 ft. We complied and landed safely in denver. We had descended to 10300 ft before instructed to maintain 11000 ft. This was my mistake. I dialed in the wrong number in our altitude preselector.

Original NASA ASRS Text

Title: BE1900 FLC DSNDS THROUGH CLRED ALT APCHING DEN.

Narrative: WHILE RECEIVING VECTORS, WE WERE TOLD TO DSND FROM 13000 FT TO 11000 FT, 190 KIAS, AND SWITCH CTLRS. WE WERE FOLLOWING TFC, AND I WAS VERY CONCERNED WITH OUR SEPARATION. THE NEXT FREQ WAS VERY BUSY, AND I WAS UNABLE TO CHK IN UNTIL WE HAD DSNDED TO 10700 FT. I BELIEVE BECAUSE OF THE TFC AHEAD, I MISTAKENLY DIALED IN 9000 FT INSTEAD OF 11000 FT. I BELIEVE 9000 FT WAS A RESULT OF '190' ON THE SPD. WHEN OUR TCASII SOUNDED, I CHKED IN AND TOLD THE CTLR OUR POS AND DSNDING TO 9000 FT. HE TOLD US TO MAINTAIN 11000 FT. WE COMPLIED AND LANDED SAFELY IN DENVER. WE HAD DSNDED TO 10300 FT BEFORE INSTRUCTED TO MAINTAIN 11000 FT. THIS WAS MY MISTAKE. I DIALED IN THE WRONG NUMBER IN OUR ALT PRESELECTOR.

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.