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===Secondary mode===
Boeing ''secondary mode'' is comparable to the Airbus ''alternate law'', with the PFCs supplying commands to the ACEs. However, EFCS functionality is reduced, including loss of flight envelope protection. Like the Airbus system, this state is entered when a number of failures occur in the EFCS or interfacing systems (e.g., ADIRU or [[SAARU]]). Moreover, in case of a complete failure of all PFCs and ACEs, the ailerons and selected roll spoilers are connected to the pilot controls by control cable, permitting mechanical control on a temporary basis.<ref name="Skybrary: Flight Control Laws" /><ref name="Boeing 777"/>
==See also==
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