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T-tail
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==Disadvantages== The aircraft may be prone to [[Stall (fluid dynamics)#Deep stall|deep stall]] (or super stall) at high [[angles of attack]], when airflow over the tailplane and elevators is blanked by the wings.<ref>{{cite web |url=http://www.thunder-and-lightnings.co.uk/javelin/history.php|title=Gloster Javelin - History |work=Thunder & Lightnings}}</ref><ref name="Hush-Kit"/> The American [[McDonnell F-101 Voodoo]] jet fighter suffered from this problem,{{citation needed|date=February 2017}} as did the British [[Gloster Javelin]], [[Hawker Siddeley Trident]] and [[BAC One-Eleven]]. A stick-pusher can be fitted to deal with this problem.<ref name="Hush-Kit"/><ref name="Davies">{{cite book |last1=Davies |first1=David P. |title=Handling the Big Jets: An Explanation of the Significant Differences in Flying Qualities Between Jet Transport Aeroplanes and Piston Engined Transport Aeroplanes, Together with Some Other Aspects of Jet Transport Handling |date=1971 |publisher=Air Registration Board |url=https://books.google.com/books?id=TKZTAAAAMAAJ |language=en |isbn=0903083019 |edition=3rd |pages=116β118}}</ref> For propeller aircraft, a T-tail configuration may reduce pitch control effectiveness if the elevators are outside the propeller slipstream.{{cn|date=October 2022}} The vertical stabilizer must be made stronger (and therefore heavier) to support the weight of the tailplane.{{cn|date=June 2024}} (However other factors may make the T-tail smaller and lighter, see [[#Advantages|Advantages]] above.) A T-tail produces a strong nose-down pitching moment in sideslip. T-tails can cause [[Aeroelasticity|aeroelastic flutter]], as seen on the [[Lockheed C-141 Starlifter]]. The fuselage must be made stiffer to counteract this. Many large aircraft can have the fin and rudder fold to reduce height in hangars, however this generally isn't feasible or useful if there is a T-tail.{{cn|date=October 2022}} [[File:Gulfstream G650 departs Bristol 23rdAug2014 arp.jpg|thumb|[[Gulfstream G650/G700/G800|Gulfstream G650]] with a T-tail and [[Rear-engine jet|rear-engines]]]] The T-tail configuration can also cause maintenance problems. The control runs to the elevators are more complex,{{cn|date=June 2024}} and the surfaces are more difficult to inspect from the ground. The loss of [[Alaska Airlines Flight 261]] was attributed to improper maintenance of the T-tail.{{citation needed|date=February 2017}} T-tails can be harder to inspect or maintain, due to their height.{{cn|date=June 2024}}
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