ZID controller experienced near loss of separation when failing to recognize climb rates.

Attributes
ACN	669881
Time
Date	200508
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : gij.vortac
State Reference	IN
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Do 328 TJ (Turbojet)
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 19 controller time certified in position1 : 15
ASRS Report	669881
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Miss Distance	horizontal : 30000 vertical : 700
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

Aircraft #1 was sebound level at FL290. Aircraft #2 was initially being stepped up under. I determined that aircraft #1 should not be a factor so aircraft #2 was issued further climb. Once idented as not being sufficient to clear aircraft #1; aircraft #2 was stopped at FL280. Aircraft #2's climb rate and need for reversed made aircraft 32 go through FL280.aircraft 2 mode C indicated FL293 when aircraft reported level. Aircraft had 5 mi lateral as determined by range/bearing feature in dsr. Odep had activated but it was determined report was in time to maintain legal separation of 5 mi or 1000 ft.

Original NASA ASRS Text

Title: ZID CTLR EXPERIENCED NEAR LOSS OF SEPARATION WHEN FAILING TO RECOGNIZE CLB RATES.

Narrative: ACFT #1 WAS SEBOUND LEVEL AT FL290. ACFT #2 WAS INITIALLY BEING STEPPED UP UNDER. I DETERMINED THAT ACFT #1 SHOULD NOT BE A FACTOR SO ACFT #2 WAS ISSUED FURTHER CLB. ONCE IDENTED AS NOT BEING SUFFICIENT TO CLR ACFT #1; ACFT #2 WAS STOPPED AT FL280. ACFT #2'S CLB RATE AND NEED FOR REVERSED MADE ACFT 32 GO THROUGH FL280.ACFT 2 MODE C INDICATED FL293 WHEN ACFT RPTED LEVEL. ACFT HAD 5 MI LATERAL AS DETERMINED BY RANGE/BEARING FEATURE IN DSR. ODEP HAD ACTIVATED BUT IT WAS DETERMINED RPT WAS IN TIME TO MAINTAIN LEGAL SEPARATION OF 5 MI OR 1000 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.