MIL-HDBK-244A 6 apr 90.pdf

MIL-HDBK-244A
5.1.5 Mechanical interface. The factors to be analyzed and
examined, include but are not limited to those below, to determine the mechanical
interface problem areas are as follows:
(a) Stores characteristics- The stores functional or operational
characteristics,mission objectives, and their integration into the
aircraft systems should be examined to better identify all factors associated
with a compatible installation of stores onto the aircraft. The attach
mechanism, the functional controls, and the store configuration should be
known to allow the engineer to perform appropriate trade-off studies to arrive
at an optimum employment of the weapon.
.
(b) Store geometry and attaching hardware location -
The store geometry and location of attaching hardware at the aircraft/weapon
interface shall be designed to provide interchangeabilitybetween various
types of aircraft and interserviceusage. The designer should consult the
Allied Operations Publication (AOP-12) prepared by the Joint Ordnance
Commanders Sub Group (JOCG). This manual will prove most useful in revealing
possible interference between munitions or stores and the structures, pylons,
bomb racks, etc. of the aircraft meant to carry them.
-.. .“.
(c) Carriage configuration- The development of the
aircraft/weapon interfacemust take into considerationthe type carriage that
will be incorporated into the aircraft, such as pylons, bomb bay, semi-submerged,
or conformal. Shaping of the aircraft fuselage, control surfaces,
and pylons are factors that must be coordinatedwith the suspension equipment
and stores for proper system integration. Each discrete type of carriage
must be adequately developed for maximum compatibilitywith existing and
proposed suspension equipment and stores.
(d) Weight distribution- The carriage configuration
must be developed with,full considerationfor store weights distribution on
the aircraft such that a full complement of stores or any partial load has
minimal effect on the aircraft static margin limits. In addition, the carriage
configuration mu’stbe developed recognizing that expensive and limited
-availabilitystores mayneed to be returned to the airfield or aircraft if
they are unused. The release sequence must also be evaluated to determine
that normal release with possible random “hung” store, or stores, does not
cause instability of the aircraft. Aircraft response and weapon dispersion
effects should be assessed.
(e) “Suspension equipment compatibility,-.The physical
characteristicsof the suspension equipment must be known to the engineer to
allow proper integration of the equipment to the ‘aircraftside of the interface.
The ~hvsical characteristicsconsist of the external configuration of
the suspens~ofiequipment, identifying size, shape, mounting holes-or provimaterials;
sions; strength; stiffness; load factors; ejector force range
connection locations; and access requirements. The aircraft “ nterface should “
be compatible with requirements of MIL-A-8591.
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