Can somebody give me any source about downlock and uplock mechanism at landing gear mechanism? - Quora
Landing Gear Uplock | Tactair Fluid Controls
K32026-1 LOCATING EQUIPMENT - UPLOCK ROLLER, MAIN LANDING GEAR DOOR - Field International Group
If a aircraft landing gear fails to drop due to hydraulic failure, is it possible to drop the landing gears manually? I heard that during 1975,aircraft landing gear can be lowered manually
Applied Sciences | Free Full-Text | Health Assessment of Landing Gear Retraction/Extension Hydraulic System Based on Improved Risk Coefficient and FCE Model