Aircraft Systems

Low-voltage Alternator warning light control unit To inst Low volt out LTS To fuel quantity indicators circuit P Power in breaker R FUEL IND. Sense (+) I To flashing beacon F Alternator Field M To pitot heat BCN PITOT A Sense (-) To radio cooling fan G B R Ground B Pull off Y P O U F L F L R S A T D R IO O B F E A N To strobe lights To landing and taxi lights B ALT U LDG LTS To ignition switch S Alternator field To wing flap system circuit breaker FLAP Clock To red doorpost maplight Ammeter To low-voltage warning light Master INST LTS To instrument, radio, compass switch and post lights Starter To oil temperature gauge Oil pressure switch To turn coordinator To low-vacuum warning light A V Switch/circuit breaker to standby vacuum pump I STBY VAC O To white doorpost light To wing N To audio muting relay flap circuit Flight hour Starter breaker I To control wheel maplight recorder contactor C S D N O A M V E To navigation lights To dome light B To radio U S RADIO 1 Magnetos To radio RADIO 2 To radio or transponder and encoding altimeter Circuit breaker (auto-reset) Fuse Diode RADIO 3 Resistor To radio Circuit breaker (push to reset) RADIO 4 Circuit breaker (pull—off, Capacitor (Noise Filter) push to reset) Figure 7-34. Electrical system schematic. 7-32 B a t t e r y ALT BAT -30 0 +30 - 60 + 60 A M P Battery contactor Ground service plug receptacle L R EDOC The hydraulic fluid is pumped through the system to an or both sides of the servo, depending on the servo type. A actuator or servo. A servo is a cylinder with a piston inside single-acting servo provides power in one direction. The that turns fluid power into work and creates the power needed selector valve allows the fluid direction to be controlled. to move an aircraft system or flight control. Servos can be This is necessary for operations such as the extension and either single-acting or double-acting, based on the needs of retraction of landing gear during which the fluid must work the system. This means that the fluid can be applied to one in two different directions. The relief valve provides an outlet