Large transport aircraft received descent clearance to FL330, PNF captain read back FL330 and PF first officer said they were cleared to FL310 and set it into the altitude window. Controller advised them that the clearance was FL330 when noting they had descended to FL310.

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Attributes
ACN	365510
Time
Date	199704
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : vxv
State Reference	TN
Altitude	msl bound lower : 31000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 150
ASRS Report	365510
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 150
ASRS Report	365628
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descended out of FL370 to FL310. Center advised we were cleared to FL330, not FL310. Center did say, it's not a problem. Captain read back FL330. I said down to FL310 and put it in the altitude window. Descent and level off made to FL310. Was uneventful and did not appear to cause any conflict whatsoever!

Original NASA ASRS Text

Title: LGT ACFT RECEIVED DSCNT CLRNC TO FL330, PNF CAPT READ BACK FL330 AND PF FO SAID THEY WERE CLRED TO FL310 AND SET IT INTO THE ALT WINDOW. CTLR ADVISED THEM THAT THE CLRNC WAS FL330 WHEN NOTING THEY HAD DSNDED TO FL310.

Narrative: DSNDED OUT OF FL370 TO FL310. CTR ADVISED WE WERE CLRED TO FL330, NOT FL310. CTR DID SAY, IT'S NOT A PROB. CAPT READ BACK FL330. I SAID DOWN TO FL310 AND PUT IT IN THE ALT WINDOW. DSCNT AND LEVEL OFF MADE TO FL310. WAS UNEVENTFUL AND DID NOT APPEAR TO CAUSE ANY CONFLICT WHATSOEVER!

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.