Figure 3-5.–Electrical circuits.
Push-button Stations
The function of the push-button station is to
select the proper contact of the weight selector
motor controller so as to rotate the shaft of the
motor in the proper direction to increase or
decrease the weight setting.
Control Valve Weight Selector
Indicator Circuit
The indicator circuit energizes the elements of
the synchro system so that remote indication of the
weight selector is obtained.
The indicator circuit includes the necessary
wiring and fusing and a master switch for the
operation of one synchro transmitter and synchro
receivers. These are located at the engine control
panel, Pri-Fly, and the deckedge control station.
When the indicator circuit master switch located
on the main control panel is turned on, the
indicator circuit is energized.
The synchro
transmitter is mechanically connected to the local
indicator of the weight control mechanism. This
connection is made at one end of the rotor shaft of
the transmitter.
When the setting of the weight
selector is changed, the transmitter rotor turns.
This movement is transmitted electrically to the
remote synchro receivers, whose rotors turn the
same angular distance as the transmitter rotor. The
receivers have an indicating dial on one end of their
rotor shaft that shows the weight setting by the
position of the rotors.
If the system is properly
zeroed, the receivers will indicate the same weight
setting readings as the local indicator.
Arresting Gear Controller (Pri-Fly)
The Pri-Fly operator is so called because her or
his station is in Primary Flight Control. The Pri-Fly
operator has the following duties:
Determine the model of aircraft making the
landing approach.
Call the proper aircraft weight selector
setting down to the engine-room talker-operators via
6JG telephone.
Check the Pri-Fly synchro receivers to make
certain that all engine-room
correctly to the weight setting.
operators respond
3 -9
