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
2. sad, sorrowful (vs. joyful). usage: of things that make you feel sad; sad news; she doesn't like sad movies; it was a very sad story; When I am dead, my dearest, / Sing no sad songs for me- Christina Rossetti. 3. deplorable, distressing, lamentable, pitiful, sad, sorry, bad (vs.