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A/M27T-5 Main Control Panel Controls and IndicatorContinued
AHT-63 control panel controls and instruments - 14018_189

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Table 4-5.—A/M27T-5 Main Control Panel Controls and Indicators-Continued FIG. 7-12 INDEX NO. CONTROL/INDICATOR FUNCTION 22 Panel Light (DS3) Provides main control panel lighting. Illuminates if ignition switch S1 is set to IGNITION ON. 23 PRESSURE BYPASS VALVE When open, causes HIGH PRESSURE RELIEF VALVE to dump flow to return line at no pressure. 24 HIGH PRESS FILTER indicator Illuminates when high pressure filter high (DS4) differential pressure switch S2 closes. S2 will close if high pressure filter inlet and outlet pressures differ by 100 psi or more. 25 H.P. GAUGE TEST port Allows application of hydraulic fluid from external source for use in testing and calibrating HIGH PRESSURE GAUGE. Used only when H.P. GAUGE SHUTOFF VALVE (on secondary control panel) is closed. 26 High pressure gauge calibrating Used to calibrate HIGH PRESSURE GAUGE when screw H.P. SHUTOFF valve (on secondary control panel) is closed. 27 HIGH PRESSURE GAUGE Indicates hydraulic pressure (0 to 6000 psi scale) at PRESSURE OUTLET ports. closing H.P. GAUGE SHUTOFF valve (on secondary control panel) isolates HIGH PRESSURE GAUGE from hydraulic system, enabling testing and calibration of gauge. 28 FLUID TEMPERATURE Indicates hydraulic fluid temperature (20° to 220°F GAUGE scale) at hydraulic pump high pressure inlet port. 29 Ignition switch S1 When set to IGNITION ON turns on panel lights DS1, DS2, and DS3 and IGNITION ON indicator DS9. Switches battery current to power supply electrical system, enabling diesel engine start-up. 30 IGNITION ON indicator (DS9) When illuminated, indicates ignition switch S1 is set to IGNITION ON. 31 HEAD TEMPERATURE gauge Indicates diesel engine coolant temperature (100° to 250ºF scale). 4-30







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