MIL-DTL-9490E
3.1.2.9.3.3 Minimum go-around altitude. A minimum altitude for engaging automatic
go-around shall be established such that the probability of incurring structural damage to the
landing gear, wing tips, or control surface is extremely remote. The minimum altitude shall include
normal performance under the wind conditions specified in 3.1.2.9 and the probability of
inadvertent loss of an engine at any time within 12 seconds preceding mode engagement.
3.1.2.10 All weather landing system. The following all weather landing system
requirements pertain to the latter stages of the approach; i.e., that portion of the approach below the
decision height or the alert height, as defined in 6.6. All weather landing system shall comply with
the following landing accuracies:
a. Longitudinal dispersion of the main landing gear touchdown point shall not exceed
1,500 feet with a 2-sigma probability, with a mean touchdown point beyond the projected glide
slope intersection with the runway. The 1,500 foot dispersion need not be symmetrically located
about the nominal touchdown point. The aircraft sink rate at touchdown shall not exceed the
structural limit of the landing gear except as an extremely remote (see 6.6) occurrence.
b. The lateral dispersion of the aircraft centerline at the main landing gear at touchdown
shall not exceed 27 feet on either side of the runway centerline with a 2-sigma probability. The roll
out guidance system (normally used during ICAO Category IIIb or IIIc visibility conditions) shall
cause the aircraft to track parallel to or convergent with the centerline of the runway.
c. The systems shall meet these requirements considering reasonable combinations of head
winds to 25 knots, tail winds to 10 knots, and crosswinds to 15 knots, according to the probability
of encountering these winds and their associated turbulence as specified in 3.1.3.7.3,
along with expected variations in aircraft configurations as specified in 3.1.2.10.1, and expected
variations in ground facility performance as specified in 3.1.2.10.2.
3.1.2.10.1 All weather landing performance standards - variations of aircraft and airborne
equipment configurations. All weather landing performance requirements shall be met while
including the effects on performance of the following aircraft and airborne equipment variations
expected to occur in normal service.
a. Landing weight and center of gravity variations.
b. Landing flap setting variations.
c. Aircraft approach speed variations.
d. Glide slope and localizer airborne receiver centering errors.
e. AFCS all weather landing system sensor, computer, and servo actuator tolerances.
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