AGE CONTROL AND SERVICE LIFE
Hose or hose assemblies fabricated from
age-sensitive materials are subject to age control. The
following definitions are provided to clarify age
control, acceptance life, shelf life, and service life:
Age controlThe efforts made during
manufacture, purchase, and the storage of age-
sensitive items and parts made from natural or
synthetic rubber materials to assure conformance to
the applicable material and performance specifi-
Age control is further defined in terms of
acceptance life and shelf life.
Acceptance lifeThe period of time from cure
date to the procuring activitys (organizational-,
intermediate-, or depot-level activity) date of
Shelf lifeThe period of time from the date of
acceptance or delivery by the organizational-,
intermediate-, or depot-level activity to the date of
Service lifeThe period of time from the date
of installation to the date of removal. Installation date
of the hose or hose assemblies must be identified by a
tag. See figure 5-5.
Acceptance Life and Shelf Life for Synthetic
Rubber Hose and Hose Assemblies
The acceptance life (MIL-STD-1523) and shelf
life (DOD 4140.27M) for synthetic rubber hose and
hose assemblies are established as follows:
Synthetic rubber hose, bulk or assembly, must
not exceed 8 years (32 quarters) from the cure date,
which must be stenciled on the rubber covering of the
bulk hose or provided on an identification band on the
metal braid hose or on the hose assemblies.
Synthetic rubber hose and hose assemblies
must not exceed 5 years (20 quarters) from the date of
delivery to the organizational-, intermediate-, or
depot-level activity. The repair activity maintains a
record of delivery dates for bulk hose and hose
assemblies to monitor shelf life expiration dates.
NOTE: Teflon® (PTFE) rubber hose and
hose assemblies do not have shelf life
Service Life for Synthetic Rubber Hose
Service life is 7 years (28 quarters) for synthetic
rubber hoses in critical applications; that is, medium-
and high-pressure synthetic rubber hoses exposed to
heat, weather, or fuel.
NOTE: Service life for Teflon® (PTFE) hose
assemblies is determined by CFA and may be
on-conditional replacement or hard-time
Rejection and replacement of hose or hose
assemblies after inspections are based on the
standards normally specified in the applicable
maintenance instruction manual, maintenance
requirement cards, and depot-level specifications.
Where rejection standards are not specifically
outlined or if doubt exists as to the acceptability of a
hose or hose assembly, replace the hose or hose
NOTE: Teflon® (PTFE) hose assemblies are
replaced only on a conditional basis.
Hose and hose assemblies fabricated from
age-sensitive materials are subject to deterioration by
oxygen, ozone, sunlight, heat, moisture, or other
environmental factors. These types of hoses and hose
assemblies should be stored in a dark, cool, dry place
protected from circulating air, sunlight, fuel, oil,
water, dust, and ozone (ozone may be generated in an
atmosphere where electricity is discharged through
oxygen or ambient air).
Store hose or hose
assemblies by sealing both ends of bulk hose. Cap or
plug each hose or hose assembly. Store hose or hose
assemblies on racks that support and protect them.
Store hose or hose assemblies so that the oldest items
are issued first.
Do not store hose or hose assemblies in
Improper storage will cause
accelerated deterioration due to both heat
and moisture factors.