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C. Mach Trim System
(1)
The mach trim system provides automatic repositioning of the elevators as a function of mach number. As the airplane enters the mach tuck region, the elevator is repositioned to provide a new neutral in an upward direction which is proportional to the increase in mach. The mach trim system operates with or without the autopilot system engaged.
(2)
The mach trim system operates in conjunction with the elevator hydraulic power control units and stabilizer/elevator neutral shift mechanism. Refer to Chapter 27, Elevator and Tab Control System.
D. Auto Throttle System
(1) The autothrottle system (if installed) automatically monitors airplane airspeed and adjusts throttle settings to maintain a selected airspeed. The autothrottle system is intended to assist the pilots in maintaining a constant airspeed when making landing approaches. The autothrottle system is independent of the autopilot system and operates with or without the autopilot system engaged.
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AUTO FLIGHT-GENERAL - MAINTENANCE PRACTICES
1. General
A. In order to maintain the integrity of the auto flight systems, it may become necessary to replace electro-hydraulic components on the elevator, aileron, and rudder power control units. This would involve handling BMS 3-11 hydraulic fluid. The following information is provided to aid in handling BMS 3-11.
2. BMS 3-11 Handling Procedure
A. BMS 3-11 is the general specification for the fluid that is used in all hydraulically operated systems. BMS 3-11 is a fire-resistant base fluid to which suitable additives have been incorporated. All fluids meeting this specification can be intermixed in any amount with no separation, precipitation or cloudiness. All airplane equipment using BMS 3-11 are identified by nameplates.
CAUTION: BMS 3-11 FLUID IS NOT COMPATIBLE WITH MIL-H-5606 FLUID. MIXING THESE FLUIDS, IN ANY AMOUNT, WILL COMPLETELY RUIN THE INTEGRITY OF THE HYDRAULIC SYSTEM.
B. Areas where hydraulic fluid may leak are designated as possible BMS 3-11 contamination areas. Special paint and protective finishes are used to prevent damage in these areas. Refer to Chapter 51, Structures - Protective Finishes.
C. BMS 3-11 has little or no effect on the metals used in aircraft construction up to 240oF. Only materials compatible with BMS 3-11 fluids, such as ethylene propylene, butyl rubber and teflon, are used for system seals, gaskets, O-rings, and hose linings.
D. Skin irritation in the form of dry or cracked skin may result from prolonged or repeated contact with BMS 3-11. It also causes painful but temporary irritation to the eyes and may produce a burning sensation to other sensitive parts of the body. Inhalation of the fluid in the form of spray of fine mist may cause irritation of the upper respiratory tract. To minimize contact with BMS 3-11, wear gloves, goggles, face shields or safety glasses whenever there is danger of exposure. If exposure occurs, flush the eyes immediately with water and report to medical for observation.
WARNING: BMS 3-11 HEATED TO TEMPERATURES ABOVE 450oF CAN BE DECOMPOSED INTO TOXIC FUMES AND GASES. AVOID INHALATION OF FUMES AND VAPORS FROM OVERHEATED BMS 3-11. IF IT IS NECESSARY TO WORK IN THESE FUMES AND VAPORS, SAFETY APPROVED EYE AND RESPIRATORY PROTECTION ARE MANDATORY.
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AUTOPILOT AND YAW DAMPER SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
SA ZS-SBL thru ZS-SBR SD ST-AFK, ST-AFL WA N4502W-N4571M GJ ALL EXCEPT B-2509 and B-2510
1. General
A. The Sperry SP-77 Automatic Flight Control System (autopilot and yaw damper system) provides automatic operation of airplane flight controls to maintain altitude, attitude and heading references, yaw damping, automatic tracking and control of omnirange navigation throughout the various flight regimes, and automatic approach.
B. The autopilot and yaw damper system is characterized by the following features:
(1)
Control wheel steering (CWS) for pitch and bank rate maneuvering.
(2)
Full time series yaw damping with control cabin self-test and full-time yaw damper position indicator.
(3)
All angle radio beam capture with control wheel steering maneuvering.
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