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The -500 can be differentiated from the -300 and -400 by the following overhead items:
[li]An extra selection on the DC metering panel for the APU battery.
[li]There are "BAT OVHT" and "APU BAT OVHT" amber lights on the aft overhead panel.
[li]There is a "TAT TEST" button on the pitot static panel because the -500 TAT probe is aspirated.
The fuel source is normally from the No 1 main tank and it is recommended that at least one pump in the supplying tank be on during the start sequence (and whenever operating) to provide positive fuel pressure and preserve the service life of the APU fuel control unit. Boeing responded to this need by installing an extra DC operated APU fuel boost pump in the No 1 tank on newer series 500 aircraft which automatically operates during APU start and shuts off when it reaches governed speed. You can quickly tell if this is installed by looking for the APU BAT position on the metering panel and the APU BAT OVHT light on the aft overhead panel.
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