TM 55-2835-209-23
4-6 REPAIR -WELD FUEL CONTROL LOWER COVER CRACKS (AVIM) (CONT)
1.
2.
3.
Vapor degrease (Task 8-2) fuel con-
trol lower cover using 1,1,1-
trichloroethane (D41).
Dry p art thoroughly with clean, fil-
tered compressed air.
Penetrant test for extent of fatigue
crack.
Liberally apply post-
emulsifiable penetrant solution,
component of penetrant inspection
kit (D27) to area with cotton appli-
cator (D10).
Leave on for 30 min-
utes.
Keep solution wet.
NOTE
If re-welding is required, do
not allow weld width to exceed
2.5 times the thickness of the
parent metal.
13.
Anodize touch up of welded area
(Task 4-8).
FOLLOW-ON MAINTENANCE: None.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Wipe off excess penetrant using
1,1,1-trichloroethane (D41) and ma-
chinery towel (D20).
Stop drill crack ends (1) to prevent
further progression of crack (2).
Clean area to be welded with
methyl-ethyl-ketone (D21) and ma-
chinery towel (D20).
Dry part thoroughly with clean, fil-
tered compressed air.
Weld crack using filler rod.
Clean welded area using 1,1,1-
trichloroethane (D41) and machinery
towel (D20).
Dry p art thoroughly with clean,
filtered compressed air.
Penetrant test for cracks in welded
area.
Liberally apply post-
emulsifiable penetrant solution,
component of penetrant inspection
kit (D27) to welded area with cot-
ton applicator.
Leave on for 5 mi-
nutes.
Keep area wet.
Wipe off excess penetrant with
1,1,1-trichloroethane (D41) and ma-
chinery towel (D20).
4-19
