Altitude deviation. Excursion from assigned altitude.

Attributes
ACN	120694
Time
Date	198908
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lgc
State Reference	GA
Altitude	msl bound lower : 18400 msl bound upper : 19000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 11000 flight time type : 2600
ASRS Report	120694
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2000 flight time type : 450
ASRS Report	120633
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

We received a clearance to 'descend so as to cross 40 southwest of atl at and maintain 12000', 1-2-thousand.' I read back clearance, then at 18400' controller asked us our altitude. He said clearance was intended for another aircraft.

Original NASA ASRS Text

Title: ALT DEVIATION. EXCURSION FROM ASSIGNED ALT.

Narrative: WE RECEIVED A CLRNC TO 'DSND SO AS TO CROSS 40 SW OF ATL AT AND MAINTAIN 12000', 1-2-THOUSAND.' I READ BACK CLRNC, THEN AT 18400' CTLR ASKED US OUR ALT. HE SAID CLRNC WAS INTENDED FOR ANOTHER ACFT.

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.