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|  MIL-S-70442 (AR)
3.4.2.11.2 Depressed reticle solution. The fire control
reticle for backup rocket (see Figure 2) shall be used as depressed
reticle for rockets when the FCC fails (FCC GOOD discrete is
false) . When this occurs, the range data being used for range
display on the HUD shall also be processed for depressing/elevating
the symbol in accordance with an exponential curve fit for rockets.
3.4.3 Physical characteristics.
3.4.3.1 Dimensions. Dimensional requirements applicable to
envelope size, mounting, and mating shall be in accordance with
Drawings 11780001, 11780002, and 11780246.
HUDS weight shall be 26 pounds maximum.
3.4.3.2 Weight
3.4.3.3 Panel liqhting. The instrument shall be provided with
integral 5-volt red lighting conforming to MIL-L-25467, except as
follows:
a. Coating. Reflection reducing coating shall be in accordance
with MIL-C-14806.
Reduced voltage operation. The lighting shall operate
b.
satisfactorily at reduced voltage. The relative brightness and
color of the display shall be uniform and all markings shall be
legible when the lighting is operated at 2.70 + 0.02 Vdc and viewed
from a distance of 28 to 30 inches.
3.4.4 Reliability.
3.4.4.1 System reliability. The HUDS shall have a
mean-time-between-failure (MTBF) of no less than 1160 hours, under
service conditions.
3.4.4.2 Service life. The HUDS shall have a minimum service
life of 19,000 flight hours.
3.4.4.3 Preconditioning [burn-in). Each HUDS procured under
this specification shall be subjected to a burn-in test as defined
in Appendix B.
3.4.5 Environmental conditions (first article testinq only).
The HUDS shall operate and meet the performance requirements of
3.4.2 under any of the environmental conditions, or a reasonable
combination of these conditions, as specified herein.
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