48-43-01: Hydraulic System Rework

48-43-01 MARTIN: Applies to All Model 202 Aircraft. To be accomplished as soon as practicable, but not later than January 1, 1949. In order to eliminate excessive hydraulic fluid leakage, the following shall be accomplished: 1. Replace the system emergency and flap synchronizer bypass valves, P/N 2021A82089, (HydroAire No. 4010) with new valves P/N 2021A82089-01 (HydroAire No. 4030). (This same subject is covered by GLM Maintenance Note No. 89.) 2. Replace the nose gear steer-valve P/N 2021A80590, by new valve P/N's 2021A23493, 2021A23508 or 2021A82131. (This same subject is covered by GLM Service Bulletin No. 46.) 3. Replace the two hydraulic test outlet dustcaps, P/N's 155-32-10 and 155-32-20, by new sealing caps, P/N's 2021A82133 and 2021A82134. (This same subject is covered by GLM Maintenance Note No. 88.) 4. Install safety wiring on main and landing gear pressure relief valves, Airex Nos. D-1068-3500 and 1265-900. (This same subject is covered by GLMService Bulletin No. 67.) 5. Replace all 24ST aluminum alloy tubing used in 3,000 p.s.i. hydraulic pressure lines with new 61ST tubing. (This same subject is covered by GLM Service Bulletin No. 66.) 6. Install proper size AN 6246 leather backup rings at the accumulator and pressure ports of the system unloading valve, Vickers Model AA-34582, at the ports of the emergency brake Valve Bendix No. 146251 and at all other ports where a universal type fitting connection is used. (GLM Standard Practice Sheet No. 35028 describes the correct method of assembling these connections.)