MTR altitude deviation overshot during descent in ord TCA.

Attributes
ACN	102443
Time
Date	198901
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 2000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	other
Make Model Name	Military Transport
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	government : military
Function	instruction : instructor
Qualification	pilot : military pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8000 flight time type : 4000
ASRS Report	102443
Person 2
Affiliation	government : military
Function	instruction : trainee
Qualification	pilot : military
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Operational Deviation Pilot Deviation

Narrative:

Flying into ord airspace from rfd. Talking to approach. Received instructions to turn to 090 degree, descend to 3000 or 4000 (?) and switch to 134.1. Copilot and I both couldn't remember if it was 3 or 4000' so on switch to 134.1 we restated 'leaving 5000' for 3000''. Upon arrival at 3000' controller asked our altitude. We said 3000'. He said we were cleared to 4000'. We stated that we read back 3000'. We agreed we must have both screwed up. No traffic conflict noted.

Original NASA ASRS Text

Title: MTR ALT DEVIATION OVERSHOT DURING DESCENT IN ORD TCA.

Narrative: FLYING INTO ORD AIRSPACE FROM RFD. TALKING TO APCH. RECEIVED INSTRUCTIONS TO TURN TO 090 DEG, DSND TO 3000 OR 4000 (?) AND SWITCH TO 134.1. COPLT AND I BOTH COULDN'T REMEMBER IF IT WAS 3 OR 4000' SO ON SWITCH TO 134.1 WE RESTATED 'LEAVING 5000' FOR 3000''. UPON ARR AT 3000' CTLR ASKED OUR ALT. WE SAID 3000'. HE SAID WE WERE CLRED TO 4000'. WE STATED THAT WE READ BACK 3000'. WE AGREED WE MUST HAVE BOTH SCREWED UP. NO TFC CONFLICT NOTED.

Data retrieved from NASA's ASRS site as of August 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.