Cga was issued a climb through an occupied altitude.

Attributes
ACN	126006
Time
Date	198910
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pwm
State Reference	ME
Altitude	msl bound lower : 37800 msl bound upper : 39000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Experience	controller radar : 18
ASRS Report	126006
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 30000 vertical : 1200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Scheduled air carrier at FL390. Corporate jet assigned FL410 as requested. Strip and radar data block indicates FL370. I did not submit new assigned altitude in the computer. I observed altitude 37,600 in data block 7 mi separation, next sweep 37,800 recleared aircraft to FL370 and turned air carrier behind corporate jet to provide additional separation. Computer readout indicated more than 5 mi, then less than 5 mi. 4,375, then more than 5 mi. Second computer readout indicated a data block jump during the air carrier turn which was ruled as no legitimate target with less than 5 mi.

Original NASA ASRS Text

Title: CGA WAS ISSUED A CLIMB THROUGH AN OCCUPIED ALT.

Narrative: SCHEDULED AIR CARRIER AT FL390. CORPORATE JET ASSIGNED FL410 AS REQUESTED. STRIP AND RADAR DATA BLOCK INDICATES FL370. I DID NOT SUBMIT NEW ASSIGNED ALT IN THE COMPUTER. I OBSERVED ALT 37,600 IN DATA BLOCK 7 MI SEPARATION, NEXT SWEEP 37,800 RECLEARED ACFT TO FL370 AND TURNED AIR CARRIER BEHIND CORPORATE JET TO PROVIDE ADDITIONAL SEPARATION. COMPUTER READOUT INDICATED MORE THAN 5 MI, THEN LESS THAN 5 MI. 4,375, THEN MORE THAN 5 MI. SECOND COMPUTER READOUT INDICATED A DATA BLOCK JUMP DURING THE AIR CARRIER TURN WHICH WAS RULED AS NO LEGITIMATE TARGET WITH LESS THAN 5 MI.

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.