TM 55-1520-240-T9-14.3 COCKPIT DOME AND UTILITY LIGHTS OPERATIONAL CHECK9-14.3INITIAL SETUPReferences:TM 55-1520-240-23Applicable Configurations:Equipment Condition:TM 55-1520-240-23:NoneBattery ConnectedElectrical Power OnMaterials:Hydraulic Power OffNoneCockpit Dome and Utility Lights Visual Check Per-Personnel Required:formed (Task 9-14.2)Aircraft ElectricianTASKRESULT1.2.3.4.5.6.7.8.9.Check that LIGHTING COCKPIT DOME cir-cuit breaker (1) is closed.Set DOME SELECT switch (2) to WHITE.Turn DOME LIGHTS control (3) from OFFthrough DIM to BRT.Turn DOME LIGHTS control (3) to OFF.Set DOME SELECT switch (2) to RED.Turn DOME LIGHTS control (3) from OFFthrough DIM to BRT.Turn DOME LIGHTS control (3) to OFF.Set DOME SELECT switch (2) to OFF.Remove pilot’s utility light from overheadpanel bracket. Press and release switch (4).Turn dimming control (5) through itsrange.Stow pilot’s utility light.Perform steps 7 and 8 with copilot’s utility light.If COCKPIT DOME circuit breaker (1) is open, closeit. If it opens again, go to task 9-14.4.White light in both dome lights shall come on andincrease in brightness as control (3) is turned toBRT. If any dome light is not lit, go to task 9-14.5. Ifbrightness does not increase, replace DOME LIGHTScontrol (3).Dome lights shall go out. If lights are still on, replaceDOME LIGHTS control (3).Red light in both dome lights shall come on and in-crease in brightness as control (3) is turned to BRT.If any dome light is not lit, go to task 9-14.6. Ifbrightness does not increase, replace DOME LIGHTScontrol (3).Dome lights shall go out. If lights are still on, replaceDOME LIGHTS control (3).Utility light shall blink when switch (4) is pressed andreleased. Utility light shall increase in brightness asdimming control (5) is turned. If utility light does notcome on, go to task 9-14.7. If light comes on butdoes not increase in brightness, replace utility light.FOLLOW-ON MAINTENANCE:TM 55-1520-240-23:Battery DisconnectedElectrical Power Off9-250/(9-251 blank)Change 2
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