Departure controller vectoring 2 air carrier BA41 aircraft from the same company and with similar call sign numbers gave a clearance to the wrong aircraft. Less than standard separation occurred at the same altitude.

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Attributes
ACN	391533
Time
Date	199801
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : gai airport : iad
State Reference	MD
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : iad tower : ilg
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach controller : departure
Qualification	controller : radar
ASRS Report	391533
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was issued control instructions meant for air carrier Y. Factors: complexity, traffic volume, frequency congestion, readback/hearback. Combined position during departure push.

Original NASA ASRS Text

Title: DEP CTLR VECTORING 2 ACR BA41 ACFT FROM THE SAME COMPANY AND WITH SIMILAR CALL SIGN NUMBERS GAVE A CLRNC TO THE WRONG ACFT. LTSS OCCURRED AT THE SAME ALT.

Narrative: ACR X WAS ISSUED CTL INSTRUCTIONS MEANT FOR ACR Y. FACTORS: COMPLEXITY, TFC VOLUME, FREQ CONGESTION, READBACK/HEARBACK. COMBINED POS DURING DEP PUSH.

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.