Ord tower controllers report of a runway incursion they observed.

Attributes
ACN	1240058
Time
Date	201502
Local Time Of Day	0001-0600
Place
Locale Reference	ORD.Airport
State Reference	IL
Aircraft 1
Make Model Name	Medium Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Aircraft 2
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Person 1
Function	Other / Unknown
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 4
Person 2
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 1.1
Events
Anomaly	Conflict Ground Conflict Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Ground Incursion Runway

Narrative:

I heard the aural alarm go off on the airport service detection equipment (asde)-X for 28R; looked up and saw aircraft X on 28R at taxiway F while aircraft Y on departure roll.I was not directly involved with the incident; I only witnessed it.

Original NASA ASRS Text

Title: ORD Tower controllers report of a runway incursion they observed.

Narrative: I heard the aural alarm go off on the Airport Service Detection Equipment (ASDE)-X for 28R; looked up and saw Aircraft X on 28R at taxiway F while Aircraft Y on departure roll.I was not directly involved with the incident; I only witnessed it.

Data retrieved from NASA's ASRS site 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.