Altitude deviation letter sent by FAA. Crew has no recollection of any occurrence.

Attributes
ACN	474750
Time
Date	200005
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zid.artcc
State Reference	KY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 10400 flight time type : 700
ASRS Report	474750
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	other controllerb
Resolutory Action	none taken : detected after the fact
Consequence	faa : assigned or threatened penalties faa : investigated
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Aircraft

Narrative:

I received a letter from the FAA regarding an altitude deviation on may/tue/00. As a flight crew we have no recollection of any such deviations. Therefore, the controller's equipment or our transponder were inoperative. It is also possible a clearance was given which we never heard, etc. We have made no errors.

Original NASA ASRS Text

Title: ALTDEV LETTER SENT BY FAA. CREW HAS NO RECOLLECTION OF ANY OCCURRENCE.

Narrative: I RECEIVED A LETTER FROM THE FAA REGARDING AN ALTDEV ON MAY/TUE/00. AS A FLC WE HAVE NO RECOLLECTION OF ANY SUCH DEVS. THEREFORE, THE CTLR'S EQUIP OR OUR XPONDER WERE INOP. IT IS ALSO POSSIBLE A CLRNC WAS GIVEN WHICH WE NEVER HEARD, ETC. WE HAVE MADE NO ERRORS.

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.