Crj-200 first officer reported they were told to cross sfo runway 28L as a B777 was taking off. The ...

Narrative:

Sfo was using only 28L/right this day due to runway construction on 1L/right. Taxied out to 28L. Holding short of 28L; tower asked us if we had the numbers for 28R. We said we did. 777 was cleared for takeoff 28L. We were instructed to 'cross 28L; caution jet blast; line up and wait 28R' the captain taxied across 28L as the 777 was departing and we felt our airplane dip to the right from the jet blast. He immediately put full left aileron to counteract the jet blast. We felt nothing other than the airplane tip to the side. We departed. Upon arrival at our destination; I performed the walk around and found a scrape under the right wing. We contact maintenance and the captain wrote up the issue.ATC cleared us to cross 28L immediately after clearing the 777 to depart. There was another aircraft on short final for 28L so it was very clear that we had to get across quickly. ATC should have waited for a larger gap to clear us to cross; rather than forcing us to cross so soon behind a heavy jet.I should have spoken up and told the captain to wait a few more moments before crossing; explaining that the jet blast was dangerous. ATC should have given us more time to cross the runway rather than squeezing us in between a heavy jet departing and another jet landing.

Original NASA ASRS Text

Title: CRJ-200 First Officer reported they were told to cross SFO Runway 28L as a B777 was taking off. The jet blast caused the CRJ to dip and scrape the right wing.

Narrative: SFO was using only 28L/R this day due to runway construction on 1L/R. Taxied out to 28L. Holding short of 28L; Tower asked us if we had the numbers for 28R. We said we did. 777 was cleared for takeoff 28L. We were instructed to 'Cross 28L; caution jet blast; line up and wait 28R' The captain taxied across 28L as the 777 was departing and we felt our airplane dip to the right from the jet blast. He immediately put full left aileron to counteract the jet blast. We felt nothing other than the airplane tip to the side. We departed. Upon arrival at our destination; I performed the walk around and found a scrape under the right wing. We contact maintenance and the captain wrote up the issue.ATC cleared us to cross 28L immediately after clearing the 777 to depart. There was another aircraft on short final for 28L so it was very clear that we had to get across quickly. ATC should have waited for a larger gap to clear us to cross; rather than forcing us to cross so soon behind a heavy jet.I should have spoken up and told the captain to wait a few more moments before crossing; explaining that the jet blast was dangerous. ATC should have given us more time to cross the runway rather than squeezing us in between a heavy jet departing and another jet landing.

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.

Attributes
ACN	1469771
Time
Date	201707
Local Time Of Day	1201-1800
Place
Locale Reference	SFO.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 129
Flight Phase	Taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	B777 Undifferentiated or Other Model
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Ground Event / Encounter Ground Strike - Aircraft

Crj-200 first officer reported they were told to cross sfo runway 28L as a B777 was taking off. The jet blast caused the crj to dip and scrape the right wing.