Editing Lockheed L-1011 TriStar (section)

===L-1011-500===
[[File:Lockheed L-1011-385-3 TriStar 500, TAP Air Portugal AN0206508.jpg|thumb|A [[TAP Air Portugal]] L-1011-500 in 1990]]

The L-1011-500 (FAA certification L-1011-385-3) was the last L-1011 variant to enter production. It was a longer-range variant first flight-tested in 1978. Its fuselage length was shortened by {{convert|14|ft|m}} and MTOW increased to allow higher fuel loads.{{citation needed|date=October 2013}} More powerful RB.211-524 engines, increased wingspan, active-load-control ailerons and other improved systems were features introduced by Lockheed to exploit newly available technologies in the late 1970s. The -500 variant was popular among international operators and formed a significant portion of the L-1011 fleet of Delta and British Airways. However, it entered service seven years after the similar [[McDonnell Douglas DC-10#Longer-range variants|DC-10-30]] entered service.{{Cn|date=September 2024}}

[[File:Lockheed L1011-500 Tristar approaching Gatwick runway 08R - geograph.org.uk - 6430300.jpg|thumb|A [[Luzair]] L1011-500 Tri Star while on approach to [[Gatwick Airport]].]]
The TriStar 500 first flew on October 16, 1978, with the first delivery to British Airways on April 27, 1979. It entered service with British Airways on May 7, 1979, flying between London and Abu Dhabi. The last L-1011 produced was a TriStar 500, operated by the Las Vegas Sands.{{Cn|date=September 2024}}

====Dimensions====
The TriStar 500 has an overall length of {{convert|164|ft|2|in|m|2}} and wingspan increased to {{convert|164|ft|4|in|m|2}} (early TriStar versions originally had the TriStar 1 wing with a span of {{convert|155|ft|4|in|m|2}}). 

====Flying surfaces====
Lockheed developed some aerodynamic improvements for the TriStar 500 which included a modified wing-to-body fairing, a fillet below the central intake, extended wingtips, and "active ailerons" or active control system (ACS). The new fairing reduced drag, while the fillet reduced noise in the rear cabin. The wingtip extensions increased aspect ratio, thus reducing induced drag, but resulted in increased bending. The ACS developed to solve this, provided gust alleviation, improving ride during flight, reduced fuel burn, and increased fatigue life.

Earlier TriStar 500s were delivered with the standard wing; these were later retrofitted with ailerons and extended wingtips. Pan Am was the first customer to order the -500 with the extended wingtips and active ailerons. Aircraft serial number 1176, the first for Pan Am, was the first TriStar 500 to be fitted with them as standard.

====Powerplant====
[[File:Lockheed L-1011-385-3 TriStar 500, AirLanka AN0962210.jpg|thumb|An [[SriLankan Airlines|Air Lanka]] L-1011-500 TriStar ferrying an extra engine.]]

The TriStar 500 is equipped with the more powerful RB211-524B engines. Initially rated at {{convert|50000|lbf|kN|abbr=on}} thrust each, the higher-thrust {{convert|53000|lbf|kN|abbr=on}} -524B4 Improved (also referred to as the -524B4I) later became available, which also offered improved [[fuel efficiency]].

====Performance====
Originally certified with an MTOW of {{convert|496000|lb|kg}}, an increased MTOW of {{convert|504000|lb|kg}} was later certified in 1979, and all earlier production aircraft were certified at this weight. A further increase, to {{convert|510000|lb|kg}}, is also available, and most TriStar 500s are thought to have had this increase. Standard fuel capacity is {{convert|31600|USgal|L}}, giving the TriStar 500 a range of about {{convert|5200|nmi|km}} with 246 passengers and baggage.

====Cabin====
The TriStar 500's maximum passenger capacity is 315, although no aircraft were operated with that number of seats.  A typical two-class layout might include 21 First Class and 229 Economy Class for a maximum of 250 passengers. More spacious three-class layouts used on longer routes include 233 with 12 First Class, 32 Business Class, and 189 Economy Class with Delta Air Lines.  The aircraft is equipped with six exits, two fewer than the long-body TriStars, thus reducing the exit limit maximum.