B747 captain reported pushback crew pushed aircraft into parked aircraft.

Attributes
ACN	1601774
Time
Date	201812
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Other Pushback
Route In Use	None
Flight Plan	IFR
Aircraft 2
Make Model Name	B747-800 Advanced
Operating Under FAR Part	Part 121
Flight Phase	Parked
Route In Use	None
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Aircraft Inflight Event / Encounter Weather / Turbulence

Narrative:

After a normal and uneventful preflight; ground ops; and preflight briefings; aircraft was secured for flight. ZZZ ops informed us that the aircraft would be deiced/anti-iced on ramp after pushback from ZZZ parking spot. During aircraft pushback with engines shutdown and in a 45 degree angle; we felt the airplane shudder; slide; and stop. I commented to the mechanic; 'it sure seems slick out there.' the tug pulled us forward and then stopped again. Finally the mechanic informed us that he thought we 'kissed' another airplane's wingtip. After being pulled back to parking and shutting down; we were informed by ground personnel that our airplane collided with a B747-8F parked on [another] spot; right wingtip to right wingtip. At no point during aircraft movement did the crew ever have control of the airplane. The flight was immediately canceled.

Original NASA ASRS Text

Title: B747 Captain reported pushback crew pushed aircraft into parked aircraft.

Narrative: After a normal and uneventful preflight; ground ops; and preflight briefings; aircraft was secured for flight. ZZZ Ops informed us that the aircraft would be deiced/anti-iced on ramp after pushback from ZZZ parking spot. During aircraft pushback with engines shutdown and in a 45 degree angle; we felt the airplane shudder; slide; and stop. I commented to the mechanic; 'It sure seems slick out there.' The tug pulled us forward and then stopped again. Finally the mechanic informed us that he thought we 'kissed' another airplane's wingtip. After being pulled back to parking and shutting down; we were informed by ground personnel that our airplane collided with a B747-8F parked on [another] spot; right wingtip to right wingtip. At no point during aircraft movement did the crew ever have control of the airplane. The flight was immediately canceled.

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.