TM 1-1500-204-23-1Table 9-4. Troubleshooting Pneumatic Deicing SystemsTroubleProbable causeRemedy1. Pressure gauge oscillates a. Faulty lines or connections. Repair or replace lines.Tighten loose connections.b. Deicing boots torn or puncturedRepair faulty boots.c. Faulty gaugeReplace gauge.d. Faulty air relief valveAdjust or replace relief valve.e. Faulty air regulatorAdjust or replace regulator.2. Pressure gauge oscillates; a. Vacuum check valves installedReinstall correctly.peaks at a specified pressureimproperlywhile instrument vacuumgauge shows no readingb. Vacuum relief valve ImproperlyAdjust or replace valve asadjusted or faultynecessary.c Faulty lines between pump andTighten, repair, or replace faultygaugelines or connections.3. Pressure gauge shows no a. Faulty pressure gauge lineRepair or replace line.pressure while vacuum gaugeshown normal reading.b. Faulty pressure gaugeReplace gauge.c. Pressure relief valve faultyAdjust or replace as necessary.d. Pressure regulator faultyAdjust or replace as necessary.4 Cycling period irregular a. Loose or faulty tubing andTighten, repair, or replace asconnectionnecessary.b. Boots torn on puncturedRepair faulty boots.c. Faulty electronic timerReplace timer.9-33
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