A small edit to the stock 747-400 from Microsoft Flight Simulator X: Accseleration. All four mighty engines received new compressors with an increased bypass ratio, thanks to which they have less suffocation at altitudes of more than 30 thousand feet and now naturally hold our liner at altitudes FL370-390; unfortunately, the same modernization entailed a decrease in the flight range, which is now 7325 nautical miles with fuel remaining for another 1 hour of flight. For comparison: the original 747-400 model from Microsoft Flight Simulator X: Accseleration had a significantly lower altitude (the service ceiling was limited to FL370), but a significantly longer flight range (10,000 nautical miles versus 7325 nautical miles); however, it was also more difficult to tear this beauty away from the runway.
Features of the takeoff of the upgraded 747-400: flaps in the 5/10 degree position (runway 9800+ feet long and standard atmosphere/runway 8800 feet long/standard atmosphere/runway 9800+ feet in the heat), elevator trim in the +4.5 degree position on ascent, the need to monitor the exhaust temperature during the takeoff run (EGT on any of the engines should not exceed 599 degrees Celsius; a higher temperature will burn the engine in the literal sense of the word). Installation instructions are in the archive. Enjoy your flights!