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|  MIL-B-52734C (ME)
without leakage.
3.15 Pull. When tested in accordance with 4.5.2.9, each interior roadway
ponton shall be capable of withstanding a tensile load of 483,000 pounds for a
time period of 5 minutes without evidence of permanent deformation or
structural failure anywhere within the ponton.
3.16 Reliability. When tested in accordance with the test plan appearing
in 4.5.2.13, an individual type I or type II bay shall possess the following
mission specified reliabilities:
a.
Type I bridge bays (interior bays), shall exceed acceptance criterion
based on an upper test value of 20 Mean Deployment Cycles Between
Failure (MDCBF) and a lower test value of 16 MDCBF.
b.
Type II bridge bays (ramp bays), shall exceed acceptance criterion
based on an upper test value of 14 MDCBF and a lower test value of 10
MDCBF.
3.17 Maintainability. The interior bay and ramp bay shall have maintenance
requirements of not more than 0.435 maintenance man-hours per launch and not
more than 0.893 maintenance in man-hours per launch, respectively. All active
maintenance man-hours required (scheduled and unscheduled) are included in the
calculation. Man-hours for repair of replaced components and scheduled
before-and-after operation checks are excluded. A maintenance schedule shall
be established prior to the start of any testing.
3.18 Tiedown provisions. The tiedown provisions shall conform to MIL-STD-
209, class 2 or 3, type IV equipment. The tiedown provisions shall
satisfactorily complete the pull testing as specified without weld failure,
permanent deformation, cracking, loosening, or breaking of the provision or
its connecting structural components.
3.19 Slinging provisions. The slinging provisions shall conform to MIL-
STD-209, class 1 or 3, type IV. The provisions shall enable the complete
bridge bay to be lifted in the normal operating position. The provisions
shall be located so that not less than one inch clearance is maintained
between slings and all exterior parts and shall be fastened to members which
will withstand stresses in the amount and direction of pull specified for the
provisions without weld failure, permanent deformation, cracking, loosening or
breaking of the provision or its connecting structural components. Slinging
provisions may also be used as tiedown provisions when such provisions meet
the requirements specified in 3.18. All slinging/tiedown provisions shall be
labeled "LIFT", "TIEDOWN" or "LIFT TIEDOWN", as appropriate, in 1-inch (2.54
cm) high letters.
3.20 Interchangeability. All parts, components and assemblies having the
same identification number shall be functionally and dimensionally
interchangeable. Interchangeability is defined as two or more parts
(components and assemblies) possessing such functional and physical
characteristics as to be equivalent in performance and durability, and capable
of being exchanged one for the other without alteration of themselves or of
adjoining parts (components and assemblies), except for built-in adjustment,
and without selection for fit or performance.
3.21
Specification-control items.
Prior to using any specification-control
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