MIL-F-9490D(USAF)
6 June 1975
SUPERSEDING
MIL-F-9490C(USAF)
13 March 1964
1.
I
MILITARY SPECIFICATION
.
FLIGHT CONTROL SYSTSMS -
OESIGN, INSTALLATION AND TSST OF
PILOTED AIRCRAFT, GENEIWL SPECIFICATION FOR
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1.
SCOPE
1.1 =. This specification establishes general performance, design,
development and quality assurance requirements for the flight control systems
of USAF manned piloted aircraft. Flight control systems (FCS) include all
components used to transmit flight control commands from the pilot or other
sources to appropriate force and moment producers.
Flight control commands
may result in control of aircraft flight path, attitude, airspeed, aefi
dynamic configuration, ride, ancJstructural modes. Among components included
are the pilot’s controls, dedicated displays and logic switching, transducers,
system dynamic and air data sensors, signal computation, test devices, trans-
❑ission devices, actuators, and signal transmission lines dedicated to flight
control. ExcIuded are aerodpmmic surfaces,
engines. helicopter rotors, fire
control devices, crew displays and electronics not dedicated to flight control.
The interfaces of flight control systems with related subsystems are defined.
1.2 Classification
1.2.1 Flight control system (FCS) classifications
1.2.1.1 Manual flight control systems [MFCS). Manual Flight Control Systems
consist of electrical, mechanical and hydraulic components which transmit pilot
control commands or generate and convey commands which augment pilot control
commands, and thereby accomplish flight control functions.
This classification
includes the longitudinal, lateral-directional,
lift, drag and variable geome-
try control systems.
In addition, their associated augmentation, performance
limiting and control devices are included.
1.2.1.2 Automatic flight control systems (AFCS). Automatic Flight Control
Systems consist of electrical
, mechanica1 and ,hydraulic components which
generate and transmit automatic control commands which provide pilot assist-
ance through automatic or semiautomatic flight path control ar which auto-
maticallY control airframe response to disturbances.
This classification
includes automatic pilots, stick or wheel steering, autothrottles, structural
mode control and similar control mechanizations.
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