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2.63 ACCUMULATOR RECHARGE.
The accumulator recharge cycle starts when the APU has reached operational speed and the APU-driven genera-tor comes on the line. The pressure switch for the accumu-lator causes the APU ACCUM LOW legend to go on and the backup system pump to develop pressure. The APU accumulator pressure should be at least 2800 psi before attempting an APU start. The accumulator is recharged from the backup pump which runs for 90 seconds after the accumulator low-pressure switch is actuated. When the winterization kit is installed, an additional identical accu-mulator is installed in parallel with the original accumula-tor. Discharge and recharge of the added accumulator is the same, except a 180-second recharge cycle for the two accu-mulators will take place when the accumulator pressure switch senses low accumulator pressure. Both accumulators are charged or discharged simultaneously. If the accumula-tors do not fully charge during the .rst 180 seconds of the backup pump operating cycle, the pump will continue to operate in 180-second segments, or until the BACKUP PUMP PWR circuit breaker is pulled, or 115 vac power is removed. The backup system pump shuts down after recharge, unless required for other purposes. Should the accumulator pressure drop, the backup system pump restarts to replenish the accumulator charge. The rate of accumulator charge is limited to protect the backup system from possible depletion due to ballistic damage to the APU start system. Should the APU not start, the accumulator may be recharged by these methods, after the APU CONTR switch is OFF. An electric ground cart powering the backup hydraulic pump or a hydraulic ground cart con-nected to the backup hydraulic system through the ground test quick-disconnects or by using the handpump in the aft upper cabin. The APU CONTR switch should not be turned ON again or the BATT switch turned OFF until after the ESU BITE indicators have been checked. The handpump may also be used to top off the accumulator charge if the charge has dropped due to a low temperature condition. A pressure gage mounted in the aft cabin (Figure 2-5) indicates the charge. Check valves prevent draining of the accumulator charge through the system.
Section XIII LIGHTING
2.64 INTERIOR LIGHTING.
The interior lighting system consists of cockpit dome lights, utility lights and a cabin dome light (Figure 2-4). NVG blue-green lighting can be selected for the cockpit dome, instrument panel glare shield, utility lights and cabin dome light. For medical interior lighting description refer to Chapter 4.
2.64.1 NVG Lighting System. The NVG lighting sys-tem consists of interior NVG blue-green lighting. Exterior lighting consists of cargo hook well area electrolumines-cent lighting, infrared formation and position lights, and attachable/detachable controllable searchlight .lter. A dim-ming feature is incorporated in the searchlight system to provide dimming through the collective SRCH LT PUSH ON -OFF, BRT, DIM switch. The position and formation lights have IR emitters installed within close proximity to the regular installed lights to enhance outside viewing with night vision goggles.
2.64.2 Cockpit Floodlights. Two blue-green and two white cockpit .oodlights are on the overhead cockpit .ood-light panel, marked BLUE, OFF and WHITE (Figure 2-6). Power is supplied from the dc essential bus through a cir-cuit breaker marked LIGHTS SEC PNL. Six lights in-stalled in the instrument panel glare shield provide second-ary lighting for the instrument panel. The lights are mechanically dimmed by a control on the upper console labeled GLARESHIELD LIGHTS with marked positions OFF and BRT. Power to operate the glare shield lights is provided from the No. 1 ac primary bus through a circuit breaker, marked LIGHTS GLARE SHLD.
2.64.3 Flight Instrument Lights. Instrument lights are grouped into .ight instrument and non.ight instruments. The .ight instrument lights are divided into pilot’s and co-pilot’s. Lights are controlled by individual rotary intensity controls (Figure 2-6), marked INST LT PILOT FLT, OFF and BRT, and CPLT FLT INST LTS, OFF and BRT. The non.ight instrument lights operate in the same manner as the .ight instrument lights. The non.ight lights intensity is controlled by a rotary control, marked INST LT NON FLT, OFF and BRT. Instrument lighting is provided by instrument bezels with NVG lights. The radar altimeters lighting incorporates dimming controls on the instrument panel, marked RAD ALT DIMMING for pilots radar al-timeters (Figure 2-8). The vertical instrument display sys-
　
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