on the aircraft. There are several barrier materials
available in the Navy stock for sealing and shrouding
large aircraft openings. The stock numbers for these
materials can be found in NAVAIR 01-1A-509.
Water-vaporproof Barrier Material. This material
is a laminated metal foil barrier that has good
water-vapor resistance. It is used for closing intake
openings, protecting acrylics during cleaning, and for
the packaging of removed components and accessories
that are returned for overhaul. It is heat sealable with
a soldering or clothes iron.
Polyethylene Plastic Film. This barrier material is
used for the same purpose as the metal foil barrier
material, but it is less expensive. However, it is not
puncture resistant. This plastic film is heat sealable
only with special equipment.
Polyethylene Coating Cloth. This cloth is used in
support equipment covers. Its use is preferred over
plastic film material for general shrouding because of
its greater tear and puncture resistance.
Tape, Federal Specification PPPT-60, Class 1.
This pressure-sensitive tape is used to close small
aircraft openings and for direct contact use on
noncritical metallic surfaces. It has moderate
water-vapor resistance that is adequate for
Pressure-sensitive Adhesive Tape. This tape was
developed specifically for exterior preservation and
sealing. It can be applied at temperatures as low as 0°F.
It should perform satisfactorily over a temperature
range of -65°F to +140°F. It is an excellent
general-purpose tape for exterior preservation and
State the levels and terms of preservation used
for naval aircraft.
What level of preservation is required if an
aircraft is scheduled to remain idle for more than
14 days but less than 28 days?
MIL-C-16173, corrosion preventive compound,
is available in three grades. Which grade(s)
is/are easily removed with dry-cleaning solvent?
Corrosion-preventive petroleum, class 3,
provides protection for what type of surfaces?
When is general-purpose lubrication oil
What type of corrosion-preventive compound
MIL-C-81309 is used on avionics and electrical
NAVAIR 15-01-500, Preservation of Naval
Aircraft, addresses specific requirements for the
cleaning, inspection, protection, maintenance, and
depreservation of auxiliary power units, gas turbine
engines, and reciprocating engines. This section only
highlights some important factors in engine
preservation. Refer to the Preservation Manual for
Level I preservation of engines requires the fuel
system to remain at least 95% full of fuel for a period
not to exceed 60 days. Any fuel system that has been
drained of fuel for more than 3 days or is expected to
remain inactive for more than 60 days is to be
preserved with MIL-L-6081 Grade 1010. and be
Level II and III preservation requirements are also
outlined in the Preservation Manual. All requirements
are listed by type engine and level of preservation
NOTE: In any case of preservation, ensure all
logbook entries and preservation tag requirements
have been met.
Do NOT use oil-based preservatives
around oxygen fittings or oxygen regulators
since fire or explosion may result.
The preservation of clean, corrosion-free surfaces
is the final step of the preventive maintenance process
of SE. The act of preservation helps to protect
nonmoving parts by filling air spaces, displacing
water, and providing a barrier to corrosion.
Preservatives For SE
Preservatives are used after SE cleaning before
ocean assignment when an extended period of SE
storage is anticipated. Preservatives are also used
wherever paint films require additional preservative
(for example, in metal joints, tightly fitting surfaces,
and on sump areas). The technical corrosion manual
to be used for support equipment is Ground Support
Equipment Cleaning And Corrosion Control,