MIL-DTL-9479E (USAF)
3.4.4 Design escape capability. Unless otherwise specified, the seat system shall be designed to
provide safe ejection as specified below, all of which shall be verified by analysis (see 4.5.1,
4.5.8):
a. Aircraft performance envelope - All flight attitudes and load factors within the design
limit and velocity-attitude envelope of the aircraft, unless otherwise stated.
b. Zero altitude (level flight) - From zero airspeed to maximum velocity of the aircraft,
unless otherwise stated.
c. Low level - At low altitude, adverse attitude conditions including those specified in table I.
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TABLE I. Low Level Escape Performance
Altitude
Velocity
Attitude
(Feet)
(Knots)
Fore and Aft
Roll Angle
60°
2
0
120
Level
180°
200
150
Level
0°
3
300
150
Level
60° Nosedown
0°
500
200
30° Nosedown
0°
500
450
60° Nosedown
60°
550
200
45° Nosedown
180°
600
250
1
The cited conditions are at the initiation of the ejection sequence
2
Aircraft impact with the ground occurs at instant of seat-aircraft separation
3
10,000 foot per minute sink rate
d. CG locations - Under the conditions specified, (see 3.4.4.a, b, and c) the cg location for any
crew member from the 5th to 95th percentile, with flight clothing, survival, and personal
equipment, as shown on figure 2.
3.4.5 Performance.
3.4.5.1 Reliability. The minimum acceptable probability of success is 0.90 at the 90-percent
lower confidence limit. A reliability analysis shall be conducted and shall include the following
(see 4.5.1, 4.5.9):
a. Full description of the component parts to be used in the seat system, with logic diagrams
and functional block diagrams to show the relationships of the components to the reliability
of the seat system.
b. Specific techniques used for allocating quantitative requirements to the components, and
the allocated values.
c. Analysis of potential modes of failure, their probable cause and effects on performance
and reliability, the severity of these effects, the probability of occurrence, and the degree of
protection afforded by the design against failure occurrence or their adverse results.
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