MIL-DTL-9490E
TABLE I. Minimum acceptable control accuracy.
Bank
angle
Altitude
0-1
1-30
30-60
(deg)
(ft)
+ 0.1% at 55,000
+ 0.1% at 55,000
+ 90 ft
varying
varying
or
55,000 to 80,000
linearly
linearly
+ 0.4% whichever
to + 0.2% at 80,000
to + 0.2% at 80,000
is larger
30,000 to 55,000
+ 0.1%
-
-
0 to 30,000
+ 30 ft
-
-
3.1.2.6 Mach hold. The Mach number existing at the engagement of Mach hold shall be the
reference. After engagement and stabilization on Mach hold, the AFCS shall maintain indicated
Mach number and the error shall not exceed ±0.01 Mach or ±2 percent of indicated Mach,
whichever is larger, with respect to the reference. Any periodic oscillation within these limits shall
have a period of at least 20 seconds. The contractor shall establish a mode response or maximum
time to capture requirement which is suitable for the mission phase.
3.1.2.7 Airspeed hold. The airspeed existing at the engagement of airspeed hold shall be
the reference. Indicated airspeed shall be maintained within ±5 knots or ± 2 percent, whichever is
greater, of the reference airspeed. Any periodic oscillation within this limit shall have a period of at
least 20 seconds. The contractor shall establish a mode response or maximum time to capture
requirement which is suitable for the mission phase.
3.1.2.8 Automatic navigation.
3.1.2.8.1 VOR/TACAN. When preconditions for radial capture are satisfied, the AFCS
shall cause the aircraft to maneuver to acquire the radial beam center. Maximum roll rate and
attitude commands shall be limited to provide a smooth capture and subsequent tracking of the
radial. The following performance requirements for VOR are stated in terms of cross track error
(feet) and radial error (expressed in μ amps; 1 degree =15 μ amps) to provide for systems using
either ARINC 547 or ARINC 579 VOR receivers. For ARINC 547 receivers, only the radial error
applies. Cross track error applied to the ARINC 579 receiver operating in the primary mode
(co-located VOR/DME), and radial error applies in the reversionary mode (DME inoperative or
not available).
3.1.2.8.1.1 VOR capture and tracking. Overshoot shall not exceed 5,800 feet (20 μa)
beyond the desired ground track line in a no-wind condition for captures 50 miles or more from the
station with intercept angles up to 45 degrees. Following capture at 50 miles or more, the aircraft
shall remain within an average of 5,800 feet (20 μa) from the VOR radial beam center, with this
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