In the ole ATPL(H) material Hydraulic Lock is described as different to Jack Stall- which if I remember correctly is a hydraulic force overload. Hydraulic Lock as I understood it from the ATPL(H) studies is a failure (design or mechanical) in which the hydraulic pressure gets around the back of the relevant actuator(s) and the controls become hydraulically 'locked'.
Definition of mourn - feel or show sorrow for the death of (someone), typically by following conventions such as the wearing of black clothes Definition of mourn - feel or show sorrow for the death of (someone), typically by following conventions such as the wearing of black clothes dictionary thesaurus
hear is to have such perception by means of the auditory sense: to hear distant bells. To listen is to give attention in order to hear and understand the meaning of a sound or sounds: to listen to what is being said; to listen for a well-known footstep. 4. See corresponding entry in Unabridged attend. 7. See corresponding entry in Unabridged regard, heed. 7. See corresponding entry in Unabridged disregard.