Aircraft was climbed to an occupied altitude resulting in less than standard separation.

Attributes
ACN	128042
Time
Date	198911
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : btg
State Reference	WA
Altitude	msl bound lower : 13400 msl bound upper : 14000
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zse tracon : pdx
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	128042
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 29250 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was climbing out of pdx approach control airspace. He was followed by air carrier Y 7 mi in trail. When I first talked to air carrier X, I had him increase speed to 160 KTS. Air carrier Y leveled at 13,000' behind air carrier X. Approach didn't send air carrier Y to my frequency until air carrier X was at 14,000' and still climbing. Since I still had 5 mi separation, I climbed air carrier Y but told him not to exceed 160 KTS. About 20 seconds later he said it would take some time to reduce because he was doing 220 KTS. The vertical separation got down to about 600' and the lateral was measured at 4.875 miles. I tried to stop air carrier Y's climb.

Original NASA ASRS Text

Title: ACFT WAS CLIMBED TO AN OCCUPIED ALT RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: ACR X WAS CLIMBING OUT OF PDX APCH CTL AIRSPACE. HE WAS FOLLOWED BY ACR Y 7 MI IN TRAIL. WHEN I FIRST TALKED TO ACR X, I HAD HIM INCREASE SPEED TO 160 KTS. ACR Y LEVELED AT 13,000' BEHIND ACR X. APCH DIDN'T SEND ACR Y TO MY FREQ UNTIL ACR X WAS AT 14,000' AND STILL CLIMBING. SINCE I STILL HAD 5 MI SEPARATION, I CLIMBED ACR Y BUT TOLD HIM NOT TO EXCEED 160 KTS. ABOUT 20 SECONDS LATER HE SAID IT WOULD TAKE SOME TIME TO REDUCE BECAUSE HE WAS DOING 220 KTS. THE VERTICAL SEPARATION GOT DOWN TO ABOUT 600' AND THE LATERAL WAS MEASURED AT 4.875 MILES. I TRIED TO STOP ACR Y'S CLIMB.

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.