CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 805
Revision 35
32-00-00
4. Aft Crosstube
A. Inspection and Blend Repair of
Corrosion, Dents, Nicks, and Scratches
(Ref. Figure 804)
Consumable Materials
(Ref. CSP−SPM)
Item Nomenclature
C241 Alodine
C316 Chemical Film
C817 Pad, Scouring, Cellulose/Nylon
NOTE: The aft crosstube is 7076-T6 aluminum
alloy (Federal Specification WW-T-700/7).
(1). Remove the paint and primer from
the base metal in Area A (ref.
CSP-SPM, Section 20-40-00).
(2). Examine Area A for corrosion,
dents, nicks, and scratches:
(a). The permitted depth of damage
is 0.020 inch (0.51 mm) max
imum.
(b). Corrosion and mechanical
defects are repairable within
Dimension RA.
(c). Replace an aft crosstube with
corrosion and mechanical defects
outside the repairable area
(Dimension RA).
(3). Remove corrosion and repair
mechanical defects within the
repairable area:
(a). Do a blend repair with a scour
ing pad (C817) or No. 400 or 600
abrasive paper.
(b). Do not remove more than 0.020
inch (0.51 mm) of the base
metal.
(c). Polish the repaired area with
No. 600 abrasive paper.
(4). Do a fluorescent penetrant inspec
tion of Area A (ref. CSP-SPM,
Section 20-90-00):
(a). If there are cracks, replace the
aft crosstube.
(b). If there are no cracks, prepare
the aft crosstube:
Alodine (C241)
Chemical Film (C316)
1). Apply a chemical conversion layer
(alodine (C241) or chemical film
(C316)) over Area A (ref. CSP-
SPM, Section 20-40-00).
2). Put masking tape over the install
ation areas for the side-stop
clamps (Dimension SS).
NOTE: Dimension SS is the typical location of
the side-stop clamps. Do not apply primer
or paint to this area.
3). Apply epoxy primer to the cross
tubes (ref. CSP-SPM, Section
20-30-00).
4). Apply exterior top-coat paint to
the crosstubes (ref. CSP-SPM,
Section 20-30-00).
5). Remove the masking tape.
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