Ord ATCT local controller misjudged spacing between traffic landing and a departing F100 air carrier...

Attributes
ACN	552791
Time
Date	200207
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	agl single value : 0
Aircraft 1
Controlling Facilities	tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	552791
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : required legal separation other anomaly other
Independent Detector	other controllera other flight crewa other flight crewb other other : 4
Resolutory Action	controller : issued new clearance controller : separated traffic flight crew : executed go around
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Cleared to position and hold runway 22L. Behind traffic just given takeoff clearance. MD80 on final runway 27L. Separation between us and runway 27L landing traffic looked close but workable. Tower told us to roll now just as traffic ahead of us rotated. He then told runway 27L traffic to go around. We continued takeoff based upon instructions to roll now. Tower apologized for confusion.

Original NASA ASRS Text

Title: ORD ATCT LCL CTLR MISJUDGED SPACING BTWN TFC LNDG AND A DEPARTING F100 ACR.

Narrative: CLRED TO POS AND HOLD RWY 22L. BEHIND TFC JUST GIVEN TKOF CLRNC. MD80 ON FINAL RWY 27L. SEPARATION BTWN US AND RWY 27L LNDG TFC LOOKED CLOSE BUT WORKABLE. TWR TOLD US TO ROLL NOW JUST AS TFC AHEAD OF US ROTATED. HE THEN TOLD RWY 27L TFC TO GO AROUND. WE CONTINUED TKOF BASED UPON INSTRUCTIONS TO ROLL NOW. TWR APOLOGIZED FOR CONFUSION.

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.