retired is the operational service life or planned
service life of the aircraft. For example, an aircraft
is purchased by the Navy with a planned service
life of 60 OPSERMOS. This means 60 months
of actual operational use. The days during which
this aircraft is in storage, undergoing special
rework at the depot facility, etc., do not count
toward the planned service life of the aircraft; they
are nonaging days. A properly maintained
nonaging record in the logbook provides a record
of all time periods that the aircraft was not aging,
and will ultimately aid in the aircraft receiving its
full operational service life.
The dates entered in block 6 of the nonaging
record reflect the entire period the aircraft is out
of service, including all transit, awaiting, and
in-process time (pipeline).
The accumulative nonaging days are recorded
in block 8. If an entry exceeds 30, or a multiple
thereof, record 30, 60, 90, etc., in block 8 and
the excess in block 9. Whenever 30, 60, 90, etc.,
is entered in block 8, an OPNAV XRAY is
forwarded to modify the period end date 1 month
for each 30-day increment. After the OPNAV
XRAY report, the accumulated days in block 8
are reduced to zero. The next entry in block 8 will
include the total in block 9 from prior incidents.
NOTE: Not mission capable (NMC) or partial
mission capable (PMC) time is NOT recorded on
the nonaging record.
Structural Life Limits (OPNAV 4790/142)
The Structural Life Limits form is generated
at the squadron level, and is used to maintain a
current record of aircraft structural life limited
items designated for depot-level replacement. The
components, with their respective life limits, are
listed in the applicable periodic maintenance
information cards (PMICs) and the latest edition
of NAVAIRINST 13120.1 for fixed-wing aircraft
and NAVAIRINST 13130.1 for rotary-wing
aircraft. The form is shown in figure 6-2.
Figure 6-2.-Structural Life Limits.