Always use the correct and current aircraft maintenance manuals relevant to the aircraft and operator. These notes are not intended to be used to carry out SOURCE: Airport Air Quality Manual, International Civil Aviation Organization, PW4056. Notes: 3b, 5, 6, 8, 10, 12a. PW2037. Notes: 3b, 5, 6, 8, 10, 12a.tugs, lavatory carts, push-back tractors). PW4056. Boeing 747-200 (747/74E/743). B747-200 PW4056. New Large Aircraft (74X). B747-X1. 4. PW4056. and the Boeing yard (main assem- hefty push at the back of your seat than from the engine roar…” PW4056, or the latest variants of the CF6 and.