Reversing systems.
CFR · 2024-01-01 · US · Title 14
Each reversing system must be designed so that— (a) No unsafe condition will result during normal operation of the system; and (b) The airplane is capable of continued safe flight and landing after any single failure, likely combination of failures, or malfunction of the reversing system.
official document · source cfr-2024 · id 14:§ 23.2420