Editing Boeing 737 (section)

=== Flight systems ===
The 737 uses a [[Aircraft flight control system#Hydro-mechanical|hydro-mechanical]] flight control system,<ref name="Leeham1">{{Cite web|url=https://leehamnews.com/2019/08/09/bjorns-corner-fly-by-steel-or-electrical-wire-part-3/|title=Bjorn's Corner: Fly by steel or electrical wire, Part 3|last=leehamcoeu|date=August 9, 2019|website=Leeham News and Analysis|language=en-US|access-date=January 10, 2020|archive-date=July 27, 2020|archive-url=https://web.archive.org/web/20200727020948/https://leehamnews.com/2019/08/09/bjorns-corner-fly-by-steel-or-electrical-wire-part-3/|url-status=live}}</ref> similar to the Boeing 707 and typical of the period in which the 737 was originally designed. Pilot commands are transmitted to hydraulic boosters attached to the control surfaces via steel cables that run through the fuselage and wings, rather than by the electrical [[fly-by-wire]] systems found in more recent designs like the Airbus A320 or Boeing 777.<ref name="Leeham1" />

The [[Aircraft flight control system|primary flight controls]] have mechanical backups. In the event of total hydraulic system failure or double engine failure, they will automatically revert to control via [[servo tab]]. In this mode, termed ''manual reversion'', the servo tabs aerodynamically control the elevators and ailerons; these servo tabs are in turn controlled by cables running to the control yoke. The pilot's muscle forces alone control the tabs.

The 737 Next Generation series introduced a six-screen [[Liquid-crystal display|LCD]] [[glass cockpit]] with modern avionics but designed to retain crew commonality with previous 737 generations.<ref>{{cite web |url=http://theflyingengineer.com/flightdeck/boeings-max-southwests-737/ |title=Boeing's MAX, Southwest's 737 |publisher=theflyingengineer |access-date=August 27, 2015 |date=December 13, 2011 |archive-date=September 7, 2015 |archive-url=https://web.archive.org/web/20150907035228/http://theflyingengineer.com/flightdeck/boeings-max-southwests-737/ |url-status=live}}</ref>
The 737 MAX introduced a 4 15.1 inch landscape LCD screen cockpit manufactured by [[Rockwell Collins]] derived from the [[Boeing 787 Dreamliner]]. Except for the [[Spoiler (aeronautics)|spoilers]], which are fly-by-wire controlled, and all the analog instruments, which became digital, everything else is similar to the cockpits of the previous 737 generations to maintain commonality.{{citation needed|date=June 2021}}

<gallery mode="packed" heights="140">
File:Boeing 737-2V6 Advanced Cockpit Dubai Air Show Ryabtsev.jpg|Original 737 cockpit
File:Cockpit of 737-300 LN-KKU.jpg|737 Classic cockpit
File:S7 Airlines Boeing 737-8ZS flight deck Beltyukov.jpg|737 Next Generation cockpit
File:737 Max Cockpit.jpg|737 MAX cockpit
</gallery>