B737 flight crew and multiple ramp personnel reported a ground encounter with a parked aircraft duri...

Attributes
ACN	1518403
Time
Date	201802
Local Time Of Day	0601-1200
Place
Locale Reference	ORD.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	B737 Undifferentiated or Other Model
Flight Phase	Parked
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 110 Flight Crew Total 21500 Flight Crew Type 3000
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 90 Flight Crew Total 8500 Flight Crew Type 3100
Events
Anomaly	Ground Event / Encounter Aircraft

Narrative:

Completed preflight and before push checklists at gate. Push crew utilized lektro hydraulic tug. Requested push clearance from ramp tower. We were advised cleared to push tail south. I relayed these instructions to push crew and brakes released. At completion of push back; driver said set brakes; cleared to start both engines. I replied brakes set; cleared to start engines. While starting second engine; nose was lowered by tug for release. After normal starts; I was expecting to hear bypass pin removed; clear to disconnect. After a few minutes; a voice on the inter phone advised there may have been contact with the 737 parked at [the nearby] gate and to standby. In the interest of safety; we shut down both engines immediately. Then began a series of communications with ramp; ground handlers; maintenance and operations; discussing status of aircraft. I called the [operations] to advise of situation. Ultimately; the aircraft was pulled back into [the] gate for further evaluation. Approximately 45 minutes elapsed from start of push until block-in. Aircraft was taken out of service. We then proceeded to [the chief pilot's office] for debrief. At this point; a replacement aircraft was located and we completed the flight.

Original NASA ASRS Text

Title: B737 flight crew and multiple ramp personnel reported a ground encounter with a parked aircraft during pushback.

Narrative: Completed preflight and before push checklists at gate. Push crew utilized lektro hydraulic tug. Requested push clearance from ramp tower. We were advised cleared to push tail south. I relayed these instructions to push crew and brakes released. At completion of push back; driver said set brakes; cleared to start both engines. I replied brakes set; cleared to start engines. While starting second engine; nose was lowered by tug for release. After normal starts; I was expecting to hear bypass pin removed; clear to disconnect. After a few minutes; a voice on the inter phone advised there may have been contact with the 737 parked at [the nearby] gate and to standby. In the interest of safety; we shut down both engines immediately. Then began a series of communications with ramp; ground handlers; maintenance and operations; discussing status of aircraft. I called the [Operations] to advise of situation. Ultimately; the aircraft was pulled back into [the] gate for further evaluation. Approximately 45 minutes elapsed from start of push until block-in. Aircraft was taken out of service. We then proceeded to [The Chief Pilot's Office] for debrief. At this point; a replacement aircraft was located and we completed the flight.

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.