MD Helicopters CSP-900RMM-2, Servicing And Maintenance

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CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 805
Revision 34
62-20-00
2. Repairs for the Flexbeam − Bumper
Assemblies
A. Flexbeam Bumper Repair
(Ref. Figure 803)
Consumable Materials
(Ref. CSP − SPM)
Item Nomenclature
C201 Sealing Compound
C425 Solvent, Cleaning
C426 Adhesive
C705 Tape, Polyethylene
C802 Cloth, Non − Lint
C810 Abrasive Cloth
Do not touch the flexbeam with metal or
power tools when you do this procedure.
Do not bend flexbeam more than 10 de­
grees during bumper removal or installa­
tion.
(1). Remove tape and remove bumper (1).
Be careful when you remove
adhesive. Do not damage glass
fibers.
(2). Remove remaining adhesive with your
hand. You can use a plastic or wood
scraper.
(3). Lightly rub surface with abrasive cloth
(C810) until surface primer not glossy.
Solvent, Cleaning (C425)
NOTE:
Mating surfaces of bumper and flexbeam
must be clean and dry.
Dry surface while solvent is still wet.
(4). Clean mating surfaces of bumper (1)
and flexbeam (2) with a non-lint cloth
(C802) moist with cleaning solvent
(C425).
(5). Do Step (4). until cloth stays clean.
Sealing Compound (C201)
(6). Mix sealing compound (C201), refer to
manufacturers instructions.
NOTE:
You must mix sealant in a clean non-
waxed container.
Apply sealant before expiration of its pot
life.
(7). Apply a 0.010 to 0.020 inch (2.54 to
5.08 mm) thick layer of sealing com­
pound (C201) to the two mating
surfaces. Do not use a metal tool.
(8). Align bumper (1) with its installed
position on flexbeam (2) and install
bumper. Do not move bumper after
installation.
(9). Make sure sealing compound (C201)
comes out all around bumper (1).
(10). Use a clamp or weight to apply pres­
sure until sealing compound cures.
(11). Apply a thin layer of sealing compound
(C201) to edge of bumper. Fully cure
sealant.
Adhesive (C426)
(12). Apply a thin layer of adhesive (C426) to
bumper where tape will be installed.
Cure adhesive for 24 hours.
(13). Wind two or three strips of polyethylene
tape (C705) around bumper (1) and
flexbeam (2).
(a). Start and end tape on vertical sides
of bumper.
(b). Apply tape with a minimum tension
to keep deformation of bumper to a
minimum.
CAUTION
CAUTION