Attitude trimmed airspeed/attitude controls

US4371936A · kind A · utility

Assignee

• UNITED TECHNOLOGIES CORPORATION · US

Inventors

• Don L. Adams · Bartlesville, US
• William C. Fischer · Monroe, US
• Stuart C. Wright · Woodbridge, US
• David J. Verzella · Guilford, US

Key dates

• Filing date: Mar 30, 1981
• Grant date: Feb 1, 1983
• Expiry date: Mar 30, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D1/0858
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In an aircraft automatic flight control system (FIG. 1) having pitch attitude synchronizing and beeping circuits 70-71 and airspeed control circuits 84, trimming of airspeed (233, 165) is achieved by beeping (104) or releasing trim (45) to adjust the pitch attitude synchronizer reference (208), causing the airspeed reference (232) to be synchronized (233, 165) for 25 seconds (156), unless the pilot applies force to the longitudinal axis (31, 32, 35) of the cyclic pitch stick (27), which causes (160, 156) termination of airspeed synchronizing.