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Schematic Diagrams
TROUBLESHOOTING AIRCRAFT SYSTEMS

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Table 3-1.—Troubleshooting Flight Hydraulic Power System Probable Cause Isolation Procedure Remedy STEP 1 TROUBLE: RESERVOIR FLUID LEVEL INDICATOR INDICATES BELOW FULL Reservoir fluid level low. Check reservoir fluid level. Service hydraulic system reservoir. STEP 2 TROUBLE: FILTER DIFFERENTIAL PRESSURE INDICATOR BUTTON UP Indicator button not properly Manually reset indicator button. Operate hydraulic power system. If reset. normal operation results, no further action required. If indicator button pops, clean and/or replace filter element. STEP 3 TROUBLE: SYSTEM HYDRAULIC PRESSURE FAILS TO DEPLETE accumulator pressure gauge Replace gauge with a known If normal operation results after defective. operative gauge. replacement, use replacement gauge. STEP 4 TROUBLE: ACCUMULATOR PRESSURE GAUGE DOES NOT INDICATE 2,000 PSI Improper accumulator preload. Deplete hydraulic system pressure, Service accumulator preload. then check accumulator pressure preload. Air filler valve. Check air filler valve for leakage. Retorque swivel nut or replace defective O-ring, defective filler valve. Pneumatic lines. Check pneumatic lines for leakage. Retorque or replace faulty pneumatic line section. accumulator pressure gauge. Replace gauge with a known If normal operation results after operative gauge. replacement, use replacement gauge. accumulator. Check accumulator for leakage. Replace defective O-rings or defective accumulator. STEP 5 TROUBLE: PILOT’'S HYDRAULIC PRESSURE INDICATOR (UPPER LEFT DIAL) INDICATES BELOW 3,000 PSI Hydraulic lines. Check hydraulic lines for leakage. Retorque or replace faulty hydraulic line section. Pilot’s hydraulic pressure Replace indicator with a known If normal operation results after indicator. operative indicator. (Refer to replacement, use replacement NAVAIR 01-85ADA-2-5.) indicator. Pressure transmitter. Replace transmitter with a known If normal operation results after operative transmitter. (Refer to replacement, use replacement NAVAIR 01-85ADA-2-5.) transmitter. 3-14







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