B747 departure from sfo runway 28R was subjected to significant buffeting on rotation from another B...

Attributes
ACN	988111
Time
Date	201201
Local Time Of Day	0001-0600
Place
Locale Reference	SFO.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 25000 Flight Crew Type 5000
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Narrative:

Sfo tower cleared us to 'line up and wait 28R'; a B747-400 had landed in front of us and was told to hold short of runway 28L. We were then cleared for take off. Close to V1 we heard the tower issue the B747 a clearance to cross runway 28L. He was on taxiway Q at the time. We were just starting our rotation when we passed taxiway Q and were subjected to significant buffeting from his jet blast. We managed to complete the take off without incident. The first officer mentioned that this was the second time this has happened to him at sfo. The tower needs to be aware of the hazard of jet blast from this size aircraft and not allow taxi while another aircraft is taking off behind it. A smaller aircraft would be even more adversely affected.

Original NASA ASRS Text

Title: B747 departure from SFO Runway 28R was subjected to significant buffeting on rotation from another B747 being taxied across Runway 28L at Taxiway Q; the reporter indicating that this was the second encounter at SFO.

Narrative: SFO Tower cleared us to 'line up and wait 28R'; a B747-400 had landed in front of us and was told to hold short of Runway 28L. We were then cleared for take off. Close to V1 we heard the Tower issue the B747 a clearance to cross Runway 28L. He was on Taxiway Q at the time. We were just starting our rotation when we passed Taxiway Q and were subjected to significant buffeting from his jet blast. We managed to complete the take off without incident. The First Officer mentioned that this was the second time this has happened to him at SFO. The Tower needs to be aware of the hazard of jet blast from this size aircraft and not allow taxi while another aircraft is taking off behind it. A smaller aircraft would be even more adversely affected.

Data retrieved from NASA's ASRS site as of July 2013 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.

B747 departure from sfo runway 28R was subjected to significant buffeting on rotation from another B747 being taxied across runway 28L at taxiway Q; the reporter indicating that this was the second encounter at sfo.