Aircraft Generator Control Units Quiz

Integrated Drive Generators (IDGs)

AC power

115/200V AC, 400 Hz, 3-phase power

<p>Provides 3-phase 115/200V AC, 324-440 Hz, emergency AC power to flight-critical loads in non-time limited emergency situations</p> Signup and view all the answers

<p>In flight, a 60 Hz converter changes aircraft 400 Hz power to a normal household frequency level; On the ground, it can be powered with a conventional external power cart</p> Signup and view all the answers

<p>Two engine-driven Integrated Drive Generators (IDGs) and an Auxiliary Power Unit (APU)-driven generator</p> Signup and view all the answers

<p>DC power is provided by five Transformer Rectifier Units (TRUs) and supplemented by two 53 Amp/Hour Ni-Cad Main Ship Batteries.</p> Signup and view all the answers

<p>The RAT provides AC power for the flight control system and aircraft essential loads if the APU generator and both main AC generators are not available.</p> Signup and view all the answers

<p>The generator contactor (LAC, RAC, AAC) is opened in approximately 160 milliseconds and the generator is de-energized.</p> Signup and view all the answers

<p>The GCU prevents the closure of the APU alternator contactor or UR AC Contactor, and the Generator Control Relay will be tripped after a time delay of 60 milliseconds maximum.</p> Signup and view all the answers

<p>The APU generator first drops power to the right main AC bus, then left main AC bus, before locking out the APU generator from all buses.</p> Signup and view all the answers

<p>The BPCUs dose and open contactors to power AC (and DC) buses in response to the COP pushbutton switch positions. They also provide automatic switching for the left and right main AC buses.</p> Signup and view all the answers

<p>The BPCUs ensure that the power source parameters match in terms of frequency and phase angle, select one power source as a reference for comparison, and then signal the GCU to adjust IDG frequency and/or phase angle to achieve congruence of power sources.</p> Signup and view all the answers

<p>The Emergency AC bus is powered by the RAT if the main AC buses cannot be powered by an aircraft generator. It is designed to provide redundancy in case of power failure.</p> Signup and view all the answers

<p>The RAT is capable of supplying Emergency AC power by converting airstream energy to electrical energy.</p> Signup and view all the answers

<p>External AC power is connected to the aircraft through an AC receptacle located on the lower right side of the aircraft fuselage, forward of the right wing. When plugged in, the left BPCU monitors the power source for quality parameters and, when requirements are met, illuminates the AVAIL legend on the EXT PVVR pushbutton on the ELECTRICAL POWER CONTROL panel.</p> Signup and view all the answers

<p>Limited wiring provisions have been installed for a 50 Hz 250V AC converter. These provisions require removing the L 60 Hz converter and installing the 50 Hz converter in its tray.</p> Signup and view all the answers

<p>The 60 Hz converters are controlled by the CABIN/GALLEY Master and the 60 Hz Master switches on the COP. Both of these switches must be activated (OFF extinguished) before the 60 Hz converters will produce power.</p> Signup and view all the answers

<p>The 400 Hz to 60/50 Hz frequency converter takes 115/1200V, 400 Hz, 3-phase power from the Right Main AC bus and converts it to 115/230V, single-phase AC power.</p> Signup and view all the answers