TM-1-1500-344-23-2
AIRCRAFT VOLUME II
TECHNICAL MANUAL; CLEANING AND CORROSION CONTROL
APRIL 2009
TM-1-1500-344-23-2 - Page 110 of 240
6-6
NAVAIR 01-1A-509-2
TM 1-1500-344-23-2
15 April 2009
6-9.
FASTENERS AND ATTACHING PARTS.
NOTE
The following does not apply to parts which are
lubricated in the joint areas immediately before
or after installation, or to close tolerance bolts
and parts which are removed frequently for
maintenance requirements. Additional
information concerning wet installation with
sealant can be found in Chapter 7, and wet
installation with primer can be found in
Appendix A.
6-9.1. Attaching parts, such as nuts, bushings, spacers,
washers, screws, self-tapping screws, sleeves for
shake-proof fastener studs, self-locking nuts, speed
nuts, clamps, and bolts, do not need to be painted
except when dissimilar metal contact is involved with
the materials being joined. However, all parts shall be
installed wet with sealant. For permanent installations,
use MIL-PRF-81733 sealant and coat the entire mating
surface of the parts. For removable installations, use
AMS 3284 sealant and coat only the lower side of the
heads of screws and bolts with sealant. For removable
installations, coat the threads and shanks of screws and
bolts or the holes into which they are inserted with a
corrosion preventive compound (see Table 8-3).
6-9.2. CLOSE TOLERANCE PARTS. Close tolerance
bolts and parts shall be coated with corrosion inhibiting
solid film lubricant. Use AS 5272 (heat curing) on
non-aluminum parts when 400
°
F (204
°
C) ovens are
available. Use MIL-L-23398 (air curing) on aluminum
parts and on all types of metallic parts when 400
°
F
ovens are unavailable. The solid film lubricant shall be
applied and completely cured prior to assembly. Bolts
shall be coated on shanks and threads only. A thin bead
of sealant shall be applied under the bolt head to impart
a wet seal. If possible, bolt head, nut, and end shall be
fillet sealed with MIL-PRF-81733 sealant after
installation.
6-9.3. RIVETS, GENERAL. All rivets shall be installed
wet with MIL-PRF-81733 sealant, except those in fuel
contact areas.
6-9.4. RIVETS, MONEL. Corrosion of nickel-copper
alloy (Monel) is evidenced by green corrosion products.
Removal of this corrosion is not required. If desired,
corrosion may be removed as follows:
a. Scrub with a brush wet with solution of one cup of
sodium bicarbonate (ASTM D928) per gallon of water.
b. Thoroughly rinse the affected area with fresh
water and dry with clean cloth or oil free, low pressure
air.
6-9.5. FASTENERS AND MAGNESIUM. All machine
screws, countersunk fasteners, bolts (head end) and
nuts which are used in contact with magnesium shall be
installed with 5056 aluminum alloy washers. These
parts and washers shall be installed wet with
MIL-PRF-81733 sealant and shall be completely fillet
sealed with the same material after installation.
6-9.6. ADJUSTABLE PARTS. Adjustable parts, such
as tie rod ends and turnbuckles:
a. If possible, surfaces and threads shall be lubricated
and protected before assembly with corrosion inhibiting
solid film lubricant (AS 5272 or MIL-L-23398) which
shall be completely cured prior to assembly. After
installation, apply a thin coating of DOD-L-25681
lubricant to all surfaces of these parts located in high
temperature areas, or a thin coating of water displacing,
corrosion preventive compound (MIL-PRF-81309 Type
II) to all surfaces of these parts located in other areas.
b. If solid film lubricants cannot be applied, use a
thin coating of DOD-L-25681 lubricant on all surfaces
before and after assembly when located in high
temperature areas. Apply a thin coating of water
displacing lubricant (MIL-PRF-81309 Type II) before
and after assembly, when parts are located in other
areas.
6-9.7. SLIP
FIT PARTS. Slip fit parts shall be assembled
with MIL-PRF-81733 sealant between the mating
surfaces. If this is not possible, coat the ID of the hole in
the receiving part, which is normally the larger structure,
with MIL-L-23398 and coat the OD of the mating part
with AS 5272 or MIL-L-23398. The solid film lubricant
shall be applied and completely cured prior to assembly.
6-9.8. PRESS FIT PARTS. Press fit parts shall be
installed with MIL-PRF-81733 sealant between the faying
surfaces, and the edges of these parts shall be fillet
sealed with the same sealant after installation. The
sealant should also be applied to the ID of the hole into
which the part will be installed.
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