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 E.  The torque switch is attached by two captive screws. Electrical connection is through an integral wire bundle, terminated at a terminal block mounted near the servomechanism. The switch provides an input to the clutch control circuit.
 F.  The throttle position potentiometer is optional on the 737 airplane. When installed, it provides throttle position data to a digital flight data recorder (DFDR). It is attached to the servomechanism, by two captive screws and electrical interface is through an integral wire bundle, terminated at a terminal block near the servomechanism.
 G.  The servo actuator is attached by four captive screws. Interface connection is through an electrical connector. The actuator consists of a 115 volt ac servo motor, a tachometer for rate feedback, a gear train, electrically operated clutch, and PC cards for clutch control. The actuator has a splined output shaft that mates with the torque switch mechanism.
 4.  DFCS Mode Control Panel
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 A.  The DFCS mode control panel (MCP) provides the pilots with a central control for the automatic flight control functions of the airplane. The MCP provides control of the autothrottle, autopilot, and flight director.
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 ALL  ú ú 07 Page 10 ú Feb 25/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B.  The DFCS mode control panel is located on the glareshield (P7).
 C.  Three controls and one light are directly related to A/T operation: A/T ARM-OFF , N1 and SPEED mode select illuminated push-type switches, and the A/T arm light. Two controls and one display provide manual speed selection for either the Autothrottle or the Autopilot/Flight Director, depending on the engaged DFCS mode; these are: the rotary IAS/MACH select control, a liquid crystal digital display for IAS/MACH, and the IAS/MACH pushbutton changeover (C/O) switch. Five other illuminated momentary push-type switches, and the altitude and vertical speed controls and displays, are provided to control the DFCS pitch axis, and affect the A/T operation.
 D.  The momentary push-type switches are used to manually select or deselect the associated mode. They are illuminated to indicate that the engaged mode can be manually deselected. The mode logic is latched by the FCC.
 E.  The A/T engage (ARM/OFF) switch is two-position, solenoid held. The switch is held in ARM, if the A/T engage interlock circuit is satisfied.
 F.  With N1 mode selected, the A/T controls the throttles maintaining N1 limit thrust. In SPEED mode, the A/T maintains the airplane's airspeed.
 G.  The rotary IAS/MACH control provides IAS/MACH reference adjustment, unless VNAV mode is selected for the DFCS. Either the A/T or DFCS uses the manually adjusted IAS/MACH reference, depending on which system provides the airspeed control. The IAS/MACH reference is displayed by the speed reference marker on the captain's and first officer's IAS/MACH indicators, and digitally displayed in the IAS/MACH window. The changeover (C/O) push-button switch manually changes the display between IAS and MACH. The remaining controls and indicators, provided to control the DFCS pitch axis modes, indirectly affect the A/T operation, as the A/T mode must be compatible with the DFCS mode. When the DFCS is controlling the airplane's airspeed, the A/T maintains N1 at the target value. When the DFCS is controlling the airplane's vertical path, the A/T maintains the airplane's airspeed at the speed reference value.
 5.  Autothrottle Disengage and TO/GA Switches_________________________________________
 A.  The A/T disengage switches are located on the end of each thrust lever handle and provide a means of disengaging the A/T. The TO/GA switches are located on the aft edge of each thrust lever and provide a means of engaging the A/T in the takeoff or go-around mode. All four switches are momentary contact type switches. Each has a set of normally open contacts and a set of normally closed contacts.
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 22-31-00
 ALL  ú ú 04 Page 11 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B.  The A/T disengage switches are designed to be operated with the thumb while the hand is on the throttle levers. The two disengage switches are wired in series and the normally closed contacts form a part of A/T engage circuits. Pressing either switch will disengage the A/T. The normally open contacts are in the A/T warning light circuit and are used to reset the warning light.
　
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