manual reversion

English

Pronunciation

• (UK) IPA^(key): /ˈman.j(ʊ).əl ɹɪˈvəː.ʃən/
• (US) IPA^(key): /ˈmæn.j(əw).əl ɹɪˈvɚ.ʒən/, /ˈmæn.j(əw).əl ɹəˈvɚ.ʒən/

Noun

manual reversion (uncountable)

1. (aviation) The actuation via purely mechanical means (using cables and/or pushrods) of one or more control surfaces that are usually controlled by hydraulics.
   • 1999, National Transportation Safety Board, “1.6.2 Boeing 737 Hydraulic System Information”, in Uncontrolled Descent And Collision With Terrain, USAir Flight 427, Boeing 737-300, N513AU, Near Aliquippa, Pennsylvania, September 8, 1994‎^[1], archived from the original on 16 January 2021, page 16:

     In the event of a failure of both hydraulic systems A and B, the ailerons and elevators can be operated manually without hydraulic power (referred to as manual reversion). The rudder has no manual reversion capability but can be operated with the standby hydraulic system.