MIL-F-18372(Aer)
31 March 1955
Superseding
SR-169A
1 July 1953
MILITARY SPECIFICATION
FLIGHT CONTROL SYSTEMS: DESIGN, INSTALLATION
AND TEST OF, AIRCRAFT (GENERAL SPECIFICATION FOR)
This specification has been approved
by the Bureau of Aeronautics, Department of the Navy
1. SCOPE
1.1 Scope: This specification covers the general requirements for the design, installation, and test
of flight control systems for all types of piloted aircraft contracted for by the U. S. Navy. (Power
plant controls are excluded).
1.2 Classification: The flight control systems include:
PRIMARY FLIGHT CONTROLS - The controls for the actuation of, usually ailerons, rudders,
elevators, rotor blades on helicopters, or other control surfaces performing similar
functions.
SECONDARY FLIGHT CONTROLS -The controls for the actuation of trim tabs, adjustable
stabilizers, and other surfaces or devices used for trimming the airplane.
FLIGHT PATH ANGLE AND SPEED CONTROLS -The controls for the actuation of high lift-drag
surfaces.
1.2.1 Primary Controls: The controls for the actuation of the primary flight control systems may be
of the following types: (Any type system not in these classification shall br discussed with the
Bureau of Aeronautics during the preliminary design stages.)
Type I - Mechanical Flight Control System -A reversible control system wherein the pilot
actuaten the primary control surfaces of the aircraft through a set of mechanical
linkages consisting of cable, pulleys, sectors and/or push-pull or torque tubes
with horns, bellcranks, etc.
Type II - Power Boosted Flight Control System. - A reversible control system wherein the
pilot effort, which is exerted through a set of mechanical linkages, is at some
point in these linkages boosted by a power source.
Type III - Power Operated Flight Control System - An irreversible control system wherein the
pilot, through a set of mechanical linkages, actuates a power control servo-
mechanism, which mechanism actuates the main control surfaces of the aircraft.
1.2.2 Secondary Controls.
- Controls for the actuation of the secondary flight control systems may, be
of the following types:
Downloaded from http://www.everyspec.com
