Inadvertent altitude assignment resulted in a military aircraft leveling off at an occupied altitude...

Attributes
ACN	125762
Time
Date	198910
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : omn
State Reference	FL
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dca
Operator	other
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute airway : zjx
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	125762
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I cleared military aircraft to 13000'--then I asked military aircraft to report level 12000', meaning to say 13000'.

Original NASA ASRS Text

Title: INADVERTENT ALT ASSIGNMENT RESULTED IN A MIL ACFT LEVELING OFF AT AN OCCUPIED ALT.

Narrative: I CLRED MIL ACFT TO 13000'--THEN I ASKED MIL ACFT TO RPT LEVEL 12000', MEANING TO SAY 13000'.

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.