Pct controller experience operational error at 7000 ft when assigning wrong altitude to departure.

Attributes
ACN	679372
Time
Date	200511
Place
Locale Reference	navaid : aml.vortac
State Reference	VA
Altitude	msl single value : 7000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : corporate
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller radar : 27 flight time total : 100
ASRS Report	679372
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera
Resolutory Action	controller : issued alert controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 8400 vertical : 700
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

The 2 aircraft depart iad. I was climbing and vectoring the second aircraft reference the first. I thought I climbed the second aircraft to 6000 ft but actually climbed to 7000 ft. The first aircraft was at 7000 ft. When I saw the second aircraft go through 6000 ft; I descend him back down to 6000 ft.

Original NASA ASRS Text

Title: PCT CTLR EXPERIENCE OPERROR AT 7000 FT WHEN ASSIGNING WRONG ALT TO DEP.

Narrative: THE 2 ACFT DEPART IAD. I WAS CLBING AND VECTORING THE SECOND ACFT REF THE FIRST. I THOUGHT I CLBED THE SECOND ACFT TO 6000 FT BUT ACTUALLY CLBED TO 7000 FT. THE FIRST ACFT WAS AT 7000 FT. WHEN I SAW THE SECOND ACFT GO THROUGH 6000 FT; I DSND HIM BACK DOWN TO 6000 FT.

Data retrieved from NASA's ASRS site as of January 2009 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.