3. Autopilot Component
A. Pitch Control Channel
(1)
The pitch control channel is installed on the El-3 shelf of the electronic equipment racks in the electrical and electronic compartment. The control channel consists of a pitch rack assembly and several plug-in modules which are the pitch rate gyro or rate deriving network, the vertical path coupler, the pitch computer, the pitch servo-amplifier, the control wheel steering (CWS) coupler and the pitch calibrator.
(2)
The pitch rate gyro on pitch channel part No. 2588810-901, -902 senses airplane pitch attitude rate of change. This unit is identical to the yaw rate gyro but is oriented in the pitch control channel to detect airplane angular pitch rate. The rate deriving network, installed on pitch channel part No. 2588810-903, -904, develops a rate signal from the vertical gyro signal feeding the channel. Throughout the text, references to rate gyro implies the rate signal whether generated by the rate gyro or developed by the rate deriving network. The vertical path coupler receives dc signals from the glide slope receiver, and amplifies and modulates the signals to ac. The unit also provides for signal gain programming. The pitch computer provides pitch control error signals to the servo-amplifier and consists essentially of a vertical path filter and an electromechanical computer. The pitch servo-amplifier supplies the stabilization signals for operating the elevator actuator transfer valve. The control wheel steering coupler provides quadrature rejection and control wheel steering sensor level detection. The pitch calibrator contains fixed resistors to adapt the gains of the pitch control channel to a specific airplane.
configuration. The pitch rack assembly is the base of the pitch control channel and supplies the necessary support and interconnection for the plug-in modules. The unit houses the pitch axis interlock logic and power supplies. The front of the rack contains the self-test switch and meter, and the gyro test switch.
(3)
The type of construction used in the pitch control channel is identical to the construction of the yaw damper coupler and some of the circuits are interchangeable.
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B. Roll Control Channel
(1)
The roll control channel is installed on the E1-3 shelf of the electronic equipment racks in the electrical and electronics compartment. The roll control channel consists of a roll rack assembly and several plug-in modules which are the roll rate gyro or rate deriving network, the lateral path coupler, the roll computer, the heading synchronizer, the roll servo-amplifier and the roll calibrator.
(2)
The roll rate gyro on roll channel part No. 2588812-901 senses, airplane roll attitude rate of change. This unit is identical to the yaw and pitch rate gyros but is oriented in the roll control channel to detect airplane angular roll rate. The rate deriving network, installed on roll channel part No. 2588812-902, develop a rate signal from the vertical gyro feeding the channel. Throughout the text, references to rate gyro implies the rate signal whether generated by the rate gyro or developed by the rate deriving network. The lateral path coupler receives dc signals from the omnirange and localizer receiver. The unit provides ac turn command signals proportional to radio beam deviation to control the airplane along the desired lateral beam flight path. The roll computer provides roll command error signals to the roll servo-amplifier. The roll computer consists essentially of amplifier limiters and an electromechanical computer. The heading synchronizer supplies heading error signals and synchronizes heading prior to engagement. The roll servo-amplifier supplies stabilization signals to operate the aileron actuator transfer valve. The roll calibrator module consists of fixed resistors to adapt the gains of the roll control channel to a specific airplane configuration. The roll rack assembly is the base of the roll control channel and supplies the necessary support and interconnection for the roll axis modules. The unit houses the roll axis interlock logic and power supplies. The front of the rack contains a self-test switch and meter, and a gyro test switch.
(3)
The construction of the roll rack assembly and the plug-in modules is the same as the yaw damper coupler and some of the circuits are interchangeable with yaw damper and pitch channel circuits.
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C. Autopilot Control Panel, Controls, and Indicator
(1)
The autopilot controls consist of circuit breakers, the autopilot control panel, the disengage and warning light reset switches, the approach progress display, the disengage warning lights, and the stabilizer out of trim warning light.
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