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During ground operations, AC UTILITY BUS 1 and 2 are load shed when a single generator (or external AC power only) is supplying AC power, and the flaps are not retracted.
ELECTRICAL Description Vol. 2 07.10.15
Oct 05/06
Manual load shedding of utility buses can be accomplished by pressing the AC UTILITY switch/light on the ELECTRICAL POWER panel.
Load shedding is indicated by the illumination of the AC UTILITY switch/light and the respective bus SHED icons on the AC ELECTRICAL synoptic page.
AC Utility Bus Shedding
Figure 07.10.13
AIR-DRIVEN GENERATOR (ADG)
Description
The ADG provides 115-volt, 400-Hz, 15-kVA power to the AC ESS BUS and 3B hydraulic pump, in the event of a complete loss of AC power in flight. The ADG is located in the forward right fuselage beside the nose gear, and is deployed automatically or manually. Once deployed, the ADG can only be restowed when the aircraft is on the ground.
ELECTRICAL Description Vol. 2 07.10.16
Oct 05/06
Air-Driven Generator
Figure 07.10.14
Components and Operation
Air-Driven Generator
The ADG consists of an AC generator mounted on a pivoted support leg, and a variable-pitch two-bladed propeller that turns in the airstream. The constant speed of the ADG is achieved by using a counterweight system to control the propeller pitch angle. This ADG is commonly referred to as the “dry ADG”.
ELECTRICAL Description Vol. 2 07.10.17
Oct 05/06
An internal heating element is installed around the circumference of the stator, to protect against condensation or frost which may form when a cold soaked ADG enters a hot, high humidity environment.
ADG Generator Control Unit
The ADG generator is controlled and monitored by the ADG generator control unit (GCU). The ADG GCU provides the following functions:
.
Monitors and controls ADG voltage output;
.
Protects against overvoltage, overfrequency and underfrequency to the ADG BUS; and
.
Provides a signal to the ADG auto deploy control unit, to energize the HYD PUMP 3B transfer contactor, emergency AC transfer contactor, and emergency DC transfer contactor when the ADG voltage and frequency are within limits.
ADG AUTO DEPLOY CONTROL Unit
Located on the lower center pedestal, the ADG AUTO DEPLOY CONTROL unit controls the automatic deployment of the ADG.
Automatic deployment of the ADG occurs when:
.
Both AC BUS 1 and AC BUS 2 become unpowered; and
.
The aircraft is in flight.
Another ADG deployment prerequisite is that one of the three main generators must be on line prior to both AC main buses going off. This prevents the ADG from deploying during ground maintenance tests, with external power being connected and disconnected with the aircraft on jacks.
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