TM 55-1520-240-23-9
11-14.1
REPAIR FINISH OF BELLCRANKS AND CONNECTING LINKS
(Continued)
11-14.1
NOTE
This is a complete repair, based
on coatings and primer missing
down to aluminum base metal. If
damage does not extend to metal, it
is only necessary to replace missing
coatings.
1.
Clean the damaged area. Use a clean cloth
(E120) damp with naphtha (E245) or dry cleaning
solvent (E162). Wear gloves (E184.1) and
goggles.
2.
Inspect damaged area:
a.
If damage extends over stenciled markings,
tag and record markings.
b.
If damage extends to aluminum base metal,
go to step 3.
c.
If yellow primer is not damaged, go to step 8.
d.
If basecoat is not damaged, go to step 15.
PREPARE BARE METAL
3.
Lightly sand damaged area to blend edges of
primer, basecoats, and topcoats. Use abrasive
paper (E9) or finer.
4.
Remove sanding residue by cleaning as in step 1.
5.
Prepare a solution of 3 ounces alodine powder
(E65) and 0.5 ounce of concentrated nitric acid
(E22) in 1 gallon of water to the damaged area.
Use brush (E86) and wear gloves (E184.1) and
goggles. Allow about 5 minutes for a coating to
form. Blot area clean with cloths (E120) wet with
clean cold water, or flush with clean cold water.
Allow metal to air dry or blow dry with clean, dry,
oil-free compressed air.
INSPECT
APPLY PRIMER
6.
Clean damaged area as in step 1.
7.
Thin epoxy primer (E292.1) with an equal amount
of toluene (E422). Apply one coat of thinned
primer to damaged area (TM 55-1500-345-23).
Let dry for at least 4 hours.
NOTE
ALBI base coat must be applied within
24 hours of primer application.
APPLY BASECOAT
8.
Clean primed area as in step 1.
9.
Lightly scuff-sand primer and surrounding area to
blend edges of existing basecoats and topcoats.
Use abrasive paper (E9) or finer.
10.
Remove sanding residue by cleaning as in step 1.
11.
Thoroughly mix basecoat (E135.3). Apply a coat
over the primed area. Let air dry at least 24
hours at 70ºF (21ºC). Do not use heating devices
to accelerate drying time between applications.
12.
Lightly scuff-sand painted area. Use abrasive
paper (E9) or finer.
NOTE
Total basecoat thickness requirement
is 0.010 to 0.012 inch (TM
55-1500-345-23).
13.
Repeat steps 11 and 12 until three coats of
basecoat (E135.3) have been applied. Let final
coat air dry for at least 24 hours at 70ºF (21ºC)
or force dry for 12 hours at 120ºF (49ºC).
INSPECT
APPLY TOPCOAT
14.
Clean painted area as in step 1.
15.
Lightly scuff-sand basecoat and surrounding
area to blend edges of existing topcoat. Use
abrasive paper (E9) or finer.
16.
Remove sanding residue by cleaning as in step 1.
17.
Thoroughly mix topcoat (E135.4). Apply a coat of
topcoat over the basecoat. Let dry for at least 24
hours at 70ºF (21ºC). Do not use heating devices
to accelerate drying time between applications.
NOTE
Total top coat thickness requirement
is 0.004 to 0.006 inch (TM
55-1500-345-23).
18.
Repeat steps 15 thru 17. Let final coat dry for
at least 48 hours at 70ºF (21ºC) or 24 hours
at 120ºF (49ºC).
INSPECT
19.
Replace any markings that were removed. Refer
to step 2. Use marking ink (E205).
FOLLOW-ON MAINTENANCE:
None
END OF TASK
11-57