MD Helicopters CSP-900RMM-2, Техническое обслуживание и ремонт

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CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 13
Original
53-30-00
H. FS 230.50 Aft Frame Assembly
(Ref. Figure 5 and Figure 6)
The FS 230.50 upper aft frame assembly is
joined to the left and right FS 230.50 lower
frame assemblies. This is a built-up assembly
that is primary structure and provides support
for the main rotor and drive system loads in all
three directions. Main rotor and drive system
loads are transferred by the left and right aft
mast fitting assemblies and the left and right
engine attachment assemblies.
Frame Web −
The frame web is a primary
structural component. The web is the shear
panel for the upper section of the FS 230.50
frame, and is the platform onto which all
components within this assembly are fastened.
This web is fabricated from aluminum alloy
sheet.
Horizontal Channel Frame −
The horizontal
frame is a secondary structural component
that is the upper frame member for the
through opening between the baggage
compartment and the passenger cabin. The
horizontal frame is fabricated from aluminum
alloy sheet.
Aft Frame Z − Section −
The aft frame Z-sec­
tion is a primary structural component that
functions as a longitudinal support member. In
addition to providing support for the deck
structure, this component provides attachment
of the anchor plates used for upper attachment
of the aft row of passenger seats. The aft
frame Z-section is fabricated from aluminum
alloy sheet.
Vertical Channels −
The left and right vertical
channels are primary structural components
that support vertical and longitudinal loads.
These components form the vertical edges of
the through opening between the baggage
compartment and cabin. The left and right
vertical channels are fabricated from alumi­
num alloy sheet.
Mast Fitting Assemblies −
The left and right
mast fitting assemblies are primary structural
components that provide for attachment of the
static mast assembly and aft support trusses.
The mast fitting assemblies are attached to
the FS 230.50 frame web at LBL and RBL
18.50 and roof longerons by pins and collars.
The fittings are attached to the deck skin by
rivets.
Each mast fitting assembly consists of a fitting
and a flanged bushing. The mast fittings are
machined from aluminum alloy stock. The
flanged bushings are machined from corrosion
resistant steel. The bushings are press fit
installed into each fitting, and then reamed to
the final hole dimension.
Static Mast Channels −
The left and right
static mast channels provide support for the
left and right mast fitting assembly. Each
channel attaches through the FS 230.50 frame
web to the aft side of the mast fitting assem­
bly. The channels are also attached to the
vertical channels and roof beams. Attachment
is by pins and collars or rivets. The channels
are machined from aluminum alloy stock.
Engine Attachment Assemblies −
The four
engine attachment assemblies are primary
structural components. The assemblies provide
for attachment of the forward leg of the tripod
engine mounts and the aft leg of the bipod
engine mounts. Attachment is by pins and
collars.
Each engine attachment assembly consists of a
fitting and a flanged bushing. The engine
attachment fittings are machined from
titanium alloy stock. The flanged bushings are
corrosion resistant steel. The bushings are
press fit installed into each fitting, and then
reamed to the final hole dimension.
Fuel Valve Support Bracket Assemblies −
The fuel valve support bracket assembly is a
secondary structural component that provides
for mounting of the left and right fuel shutoff
valve assembly. The bracket is attached by
rivets. The valve support bracket assembly is
fabricated from aluminum alloy sheet.
Doublers, Gussets, Angles, Channel Frames
and Brackets −
The doublers, gussets,
stiffening angles, channel frames and brackets
are secondary structural components. These
components are fabricated from aluminum
alloy sheet.
Tie-down Rings and Studs - A tie-down
ring and stud is installed into the left and
right side of the FS 230.50 upper frame
assembly. The tie-down rings are steel and are
standard load ring hardware.