Editing Lockheed L-1011 TriStar (section)

=== All-flying tail ===
Instead of the [[Stabilizer (aeronautics)#Horizontal stabilizer configurations|trimmable horizontal stabilizer]] (THS) found on most jetliners of its time, the L-1011 incorporated an all-flying tail – a [[stabilator]]. The aft portion had a geared (anti-[[Servo tab|servo]]) [[Elevator (aeronautics)|elevator]] that was linked to and moved with the stabilator, changing the stabilator's camber and improving the overall control surface effectiveness. Lockheed's main drive away from a THS was "[eliminating] mis-trim and runaway trim problems that have contributed to a number of accidents in the past."<ref name=":0" />{{Rp|30–31}}<ref>{{Cite book|last=Beach|first=J. B.|title=SAE Technical Paper Series|date=1968-02-01|chapter=Designing the Lockheed L-1011 to Meet Airline Needs Beyond 1970|volume=1|chapter-url=https://www.sae.org/publications/technical-papers/content/680545/|language=en|location=Warrendale, PA|pages=2229|doi=10.4271/680545}}</ref> The fact that the elevators are not moved directly led to the failure in recognizing the jamming (trailing edge up) of the left elevator aboard [[Delta Air Lines Flight 1080]] in 1977.<ref>{{Cite web|last=LisbonJet|first=Publicada por|title=Delta flight 1080 incident|url=https://blog.tristar500.net/2017/08/delta-flight-1080-incident.html|access-date=2020-12-10|language=en}}</ref>