1-19. TACHOMETER GENERATOR. (See figure 1-3. )
1-20. The tachometer generator is stowed inside the hinged door of the control console.
When in use,' the tachometer generator is mounted in tandem with the speed switch on
the APU, and generates a small voltage which is converted to an indication on the engine
speed indicator instrument during engine operation.
1-21. FUEL SYSTEM. (See figure 1-5.)
1-22. The fuel system consists of a fuel tank, an electric motor-driven fuel boost
pump, a disposable-element type fuel filter, and connecting rigid and flexible plumbing.
The filter and boost pump are mounted on a support bracket, which is bolted to the
engine support frame on the trailer. All components provide a complete and independent
fuel system for the operation of the APU while on the trailer. A flexible hose, connected
to a dummy fitting, connects the fuel system to the APU.
1-23. FUEL TANK. (See figure 1-3.)
1-24. The fuel tank is a 40-gallon-capacity aluminum tank built into the trailer frame.
The tank has a four-inch diameter filler neck, an overboard vent, and a drain fitting
for draining condensation or for draining the tank prior to shipping or storage. A
standpipe and fitting connects to the fuel boost pump through rigid tubing. The tank
filler cap incorporates a dipstick fuel indicator.
Figure 1-5. Fuel System Schematic
1-6
