B787-900
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Conflict Ground Conflict; Less Severe; Ground Event / Encounter Other / Unknown
General None Reported / Taken
Airport
We landed (B-787-9) behind a 747 on LAX Runway 24R. They cleared at Taxiway AA and were told to hold short of RWY 24L at AA. We had briefed a plan to clear at AA also. As we landed and were rolling out; I was not sure; visually; if we rolled out to the end; since the area between the two runways was occupied; if our wingtip would clear the 747's tail. As it was we slowed to a taxi speed before AA; and about that time the Tower cleared them to cross 24L and then cleared us to follow them and cross 24L also. The reason I am filling out this report is to ask for some guidance as to whether these taxiways and runways have been measured to assure clearance for landing aircraft when a wide body is holding between the Runways; 24L and 24R on Taxiway AA. The previous week; I landed our B-787 and cleared Runway 24R at AA. Behind us; on final; was an A-380 'Super'; While we were holding short on AA of Runway 24L; with that A-380 cleared to land behind us and told to roll to the end; BB; the Tower called us and asked us to move up as close to the hold line as possible; I guess we were ten feet from that point. At that point; being at an angle; and not being able to see the runway behind us; I thought; wow; I hope that A-380 can clear our tail. It did and I could see them roll to the end. That was a 787 holding with an A-380 landing least week. This week it was a 747 holding and our 787 landing. Both times; I had no assurance that the landing aircraft could clear the tail of the aircraft holding between the runways at AA. That is what I am requesting from the [report] submission. The wing span of an A-380 is about 261 feet; so; if they were able to roll out past us the previous week; I guess our 787's wingspan of less than 200 feet would not have been an issue for the 747 holding; but; in that brief instant; I was not sure. I really don't like not being sure of something when I am flying an airplane. That is why I am asking for some measurements or engineering documentation; possibly done during the preparations made to ready LAX airport to handle the A-380's; to assure me that any heavy or super aircraft holding between the Runway 24's on Taxiway AA would have guaranteed clearance from another heavy or super landing on 24R.
787 Captain reported upon landing at LAX that the holding area on TWY AA was occupied and was concerned their wingtip would not clear the tail of a 747 on AA; if they had to roll to the end.