An air carrier flight crew flying crj near xna descended below the altitude cleared by ATC.

Attributes
ACN	434090
Time
Date	199904
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : rzc.vortac
State Reference	AK
Altitude	msl bound lower : 10600 msl bound upper : 11000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : instrument pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 1600 flight time type : 10
ASRS Report	434090
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 12500 flight time type : 1000
ASRS Report	434419
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC cleared our flight to 10000 ft (descent), which the captain (PNF) read back. Altitude was set in altitude preset and descent was initiated. Passing 10600 ft MSL, ATC asked 'what altitude are you going to?' I replied to ATC because captain was talking to operations at the time. I stated that we were cleared to 10000 ft. ATC said he had cleared us to 11000 ft. He said to continue our descent to 6000 ft. I was completing my first trip on IOE.

Original NASA ASRS Text

Title: AN ACR FLC FLYING CRJ NEAR XNA DSNDED BELOW THE ALT CLRED BY ATC.

Narrative: ATC CLRED OUR FLT TO 10000 FT (DSCNT), WHICH THE CAPT (PNF) READ BACK. ALT WAS SET IN ALT PRESET AND DSCNT WAS INITIATED. PASSING 10600 FT MSL, ATC ASKED 'WHAT ALT ARE YOU GOING TO?' I REPLIED TO ATC BECAUSE CAPT WAS TALKING TO OPS AT THE TIME. I STATED THAT WE WERE CLRED TO 10000 FT. ATC SAID HE HAD CLRED US TO 11000 FT. HE SAID TO CONTINUE OUR DSCNT TO 6000 FT. I WAS COMPLETING MY FIRST TRIP ON IOE.

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.