I2-19. TROUBLESHOOTING CHART (continued).s. UPPER REAR DOOR.The upper rear door is powered hydraulically by the hydraulic actuator. The hydraulic actuator is powered byeither the primary hydraulic pump or one of the backup hydraulic pumps. It is raised and lowered electricallyby one of two switches located at the rear of the vehicle at the top of the upper rear door and at the bottom nearthe APU control box. The upper rear door can also be operated manually by the push buttons on either sideof the directional control valve located underneath the hydraulic control panel.2-273TM 6-2350-287-20-1
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