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

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CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 2
Revision 33
53-55-00
ends of the horizontal stabilizer spar. Each
journal housing has an integral attach flange
and is installed with blind titanium fasteners.
The journal bearings are installed into the
journal housings with an interference fit.
The left and right upper and lower journal
housings are machined from aluminum alloy
plate. The journal bearings have an aluminum
alloy outer housing and a flanged Karon
inner liner.
F. Attach Bracket
The attach brackets are installed to the inner
side of the horizontal stabilizer spar and give
support for the Vertical Stabilization Control
System (VSCS) actuators, refer to Section
67-20-00 for more date about the VSCS
system. The attach brackets are installed with
blind titanium fasteners.
The attach brackets are made from aluminum
alloy sheet, and standard hardware.
3. Elastomeric Damper
(Ref. Figure 1)
The elastomeric damper attaches the horizon­
tal stabilizer to the left side of the attach
frames on the aft end of the tailboom. The
elastomeric damper inboard side is attached to
the flanges of the attach frames. On the
outboard side the elastomeric damper is
attached to the left side attach fitting on the
horizontal stabilizer. The elastomeric damper
is attached with bolts and nutplates.
The elastomeric damper has an inboard and
outboard attach plate connected to a elasto­
meric pad. The damper also has a pin on each
end of the inboard attach plate that engages a
related slot on the outboard attach plate. The
pins and slots keep the damper together if the
elastomeric material comes loose from one of
the two plates. And it is an indication of
elastomeric pad condition. The attach plates
are machined from aluminum alloy stock. The
pins are heat treated corrosion resistant steel.
4. Endplate
(Ref. Figure 1)
The upper and lower endplates are movable
control surfaces that help control yaw of the
helicopter in forward flight. Each side upper
and lower endplates are installed on a spar
tube that is controlled by the Vertical Stabiliz­
er Control System (VSCS), for more data about
the VSCS system, refer to Section 67-00-00.
The left and right upper and lower endplates
are installed on the spar tubes and are
different at each location. The upper endplates
have different trailing edge tabs. Only the
right lower endplate has a trailing edge tab.
The edplates are also installed at different
angles.
The endplates are installed on the spar tubes
with internal blocks, bolts with lock device,
and special nut assemblies. Each endplate has
an endplate body, upper and lower blocks,
closeouts, and tip cap.
A. Endplate Body
The endplate body is a monolithic laminate
with thicker areas at the leading edge and
center sections. The skins are applied on a ply
of syntactic foam at the leading edge and are a
monolithic laminate at the aft section. All
sections and skins are cocured as one assem­
bly. All plies in the reinforced sections and the
skins are made of graphite/epoxy. Astrostrike
is installed around the leading edge and ends
at the spar.
B. Endplate Block
The endplate blocks are monolithic laminate
fittings made of multiple plies of fiberglass/
epoxy. The blocks are bonded into the endplate
body with an epoxy adhesive.
C. Closeout
The closeouts are monolithic laminate compo­
nents made of multiple plies of graphite/epoxy.
The closeouts are bonded into the endplate
bodies with an epoxy adhesive.
D. Tip Cap
The tip caps are monolithic laminate compo­
nents made of multiple plies of resin impreg­
nated carbon fiber fabric. The tip caps are
bonded onto the endplate body with an epoxy
adhesive.