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|  MIL-C-18244A(WEP)
3.1.1.5.2.6
Altitude Hold - Engagement of the altitude hold function at rates of climb or
dive less than 2000 fpm shall select the existing barometric altitude and control the air craft to this
altitude as a reference.
3.1.1.5.2.6.1
Control Accuracy - After engagement and stabilization or altitude control,
a constant barometric altitiude shall be maintained within + 30 feet up to 30,000 feet. From 30,000
feet to 55,000 feet constant altitude shall be maintained within + 0.l percent. From 55,000 feet to,
80,000 feet constant altitude shall be maintained within + 0.1 percent at 55,000 feet varying linearity
to 0.2 percent at 80,000 feet. Up to an altitude of 80,000 feet the AFCS shall hold the reference
altitude to within + 60 feet or 0.3 percent whichever is greater up to 30 bank angle and + 90 feet or
0.4 percent whichever is greater from 30 to 60 bank angles. Within the capabilities of the aircraft,
any periodic oscillation within these limits shall have a period of at least 20 seconds.
3.1.1.5.2.7
Mach Hold- After engagement and stabilization on Mach hold, the automatic
flight control system shall maintain the selected Mach number without further attention. The steady
state Mach number error shall not exceed 0.01 steady state Mach number. Provisions shall be
made for trimming over a range of at least 0.05 Mach. Any periodic oscillation within these limits
shall have a period of at least 20 seconds.
3.1.1.5.2.8
Return to Level - This mode shall be operable from any flight attitude and
shall return the aircraft automatically to a straight and level flight condition through the smallest
angle with no overshoot. There shall be no stopping or reversal of either roll rate or pitch rate
during this maneuver other than the overshoot specified in 3.1.1.5.2.1 and 3.3.1.5.2.2. When
operated the return to level control shall disengage any other automatic control mode. When leveled
the aircraft shall be in the attitude hold mode.
3.1.1.5.2.9
Control Stick Maneuvering - The force applied at the stick grip reference
point to effect disengagement of any other operational modes shall be minimized consistent with the
prevention of nuisance disconnects. When the force on the stick is released the automatic flight con-
trol system shall maintain the aircraft at the attitude prevailing at the time of stick release.
Stick Feel - The stick forces experienced by the pilot shall not exceed + 25
3.1.1.5.2.9.1
percent of the force while maneuvering through the manual control system under similar
aerodynamic conditions.
Standard Legend and Definitions for AFCS Control Panel.
3.1.1.5.2.10
.
ABBREVIATION
DEFINITION
NOMENCLATURE
AUTO LAND
A control mode in which the
AUTOMATIC
APPROACH
aircraft's speed and flight path
AND LANDING
are automatically controlled for
approach, flareout and landing.
ALT
ALTITUDE
HOLD
Barometric altitude existing at
time of engagement maintained
automatically.
AFCS
A system which automatically
AUTOMATIC FLIGHT
controls the flight of an aircraft
CONTROL SYSTEM
to a path or attitude described
by reference internal or external
to the aircraft.
ENGAGE
A system state in which aircraft
ENGAGE
control surfaces are actuated
by the automatic flight control
system actuators.
10
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