C560 crew had altitude deviation on descent into cak.

Attributes
ACN	458393
Time
Date	199912
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : aco.airport
State Reference	OH
Altitude	msl bound lower : 4000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cak.tracon
Operator	general aviation : corporate
Make Model Name	Citation V
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 125 flight time total : 10000 flight time type : 2800
ASRS Report	458393
Person 2
Affiliation	company : corporate
Function	oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 200
ASRS Report	458175
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : atc radar other controllera
Resolutory Action	controller : issued alert controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were approaching the akron-canton area landing at cak. We were level at 9000 ft talking to cak approach. The controller cleared us present heading, descend and maintain 5000 ft. (After reviewing tape) controller said PNF read back 5000 ft. PNF selected 4000 ft in the altitude alerter. I descended the airplane to 4000 ft and the approach controller asked us 'what altitude are you descending to?' we told him we were level at 4000 ft. He then gave us a heading of 050 degrees (downwind leg) and asked if we had the airport in sight. We confirmed visual contact with the runway. He then cleared us for the visual approach to runway 23. After parking at the FBO the tower called us asking about the altitude deviation. After meeting with the tower supervisor, we explained that we thought we were cleared to 4000 ft. PNF speaks really soft on the radio and it is real hard to hear what is said through the side tone.

Original NASA ASRS Text

Title: C560 CREW HAD ALTDEV ON DSCNT INTO CAK.

Narrative: WE WERE APCHING THE AKRON-CANTON AREA LNDG AT CAK. WE WERE LEVEL AT 9000 FT TALKING TO CAK APCH. THE CTLR CLRED US PRESENT HDG, DSND AND MAINTAIN 5000 FT. (AFTER REVIEWING TAPE) CTLR SAID PNF READ BACK 5000 FT. PNF SELECTED 4000 FT IN THE ALT ALERTER. I DSNDED THE AIRPLANE TO 4000 FT AND THE APCH CTLR ASKED US 'WHAT ALT ARE YOU DSNDING TO?' WE TOLD HIM WE WERE LEVEL AT 4000 FT. HE THEN GAVE US A HDG OF 050 DEGS (DOWNWIND LEG) AND ASKED IF WE HAD THE ARPT IN SIGHT. WE CONFIRMED VISUAL CONTACT WITH THE RWY. HE THEN CLRED US FOR THE VISUAL APCH TO RWY 23. AFTER PARKING AT THE FBO THE TWR CALLED US ASKING ABOUT THE ALTDEV. AFTER MEETING WITH THE TWR SUPVR, WE EXPLAINED THAT WE THOUGHT WE WERE CLRED TO 4000 FT. PNF SPEAKS REALLY SOFT ON THE RADIO AND IT IS REAL HARD TO HEAR WHAT IS SAID THROUGH THE SIDE TONE.

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.