Editing Lockheed L-1011 TriStar (section)

===L-1011-250===
The L-1011-250 was an upgrade developed for late-model L-1011-1 aircraft and all L-1011-100 and L-1011-200 aircraft. The more powerful engines, lengthened wing, active-load-control ailerons and other systems that had been developed for the L-1011-500 were adapted into the baseline model.  The changes resulted in increases in maximum takeoff weight to {{convert|510000|lb|kg}} and fuel capacity from 23,600&nbsp;US gal (89,335&nbsp;L) to 31,632&nbsp;US gal (119,735&nbsp;L). This variant also used the upgraded [[Rolls-Royce RB211|RB211-524B4I]] engine, which could be easily retrofitted to the existing [[Rolls-Royce RB211|RB211-524B]] powerplants of the L-1011-200, but it required a re-engining on the L-1011-1 and L-1011-100, which used the original RB211-22B. The conversion allowed the L-1011 to match the performance of the long-range McDonnell Douglas DC-10-30. Although it could be applied to all L-1011 models, the upgrade was only undertaken by Delta on six late-model L-1011-1 aircraft.