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

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CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 8
Original
53-30-00
Hydraulics Roof Support Installation −
The
hydraulics roof support installation installs
additional secondary structural components
and related standard hardware to the roof
structure. The additional components provide
the attachment for the left and right manifold
/ reservoirs and the optional hand pump of the
hydraulic subsystem.
This installation installs two intercostals and
associated clips, between LBL and RBL 7.75
and 18.50. Intercostals, stiffeners, gussets, and
attachment cleats are installed immediately
aft of FS 155.50 between BL 0.00 and LBL
7.75 for support of the hydraulic hand pump.
The components within this installation are
fabricated from aluminum alloy sheet.
Forward Cowl Attachment Angles −
The
forward cowl attachment angles are secondary
structural components. The forward cowl
attachment angles are fabricated from
aluminum alloy sheet.
E. Mid Roof Installation
(Ref. Figure 5)
The major components within this installation
are the forward roof deck skin, roof longerons,
longeron reinforcing angles, left and right aft
engine attachment assemblies, engine
mounting intercostals, mid roof straps,
longeron and bridging doublers, FS 220.50
deck skin and inboard longeron deck skin
doublers, and fuel valve mount bracket
assemblies.
Secondary components include deck skin
stiffeners, lower flange channels, and standard
hardware.
Forward Roof Deck Skin −
The forward roof
deck skin is the upper deck skin located
immediately aft of the FS 155.50 frame
assembly and forward of the engine inlet
plenums. The skin extends to the left and right
roof beams. This component is a primary
structural component and functions as the
shear panel for the roof structure. The forward
roof skin is fabricated from .020-inches thick
aluminum alloy sheet.
Roof Longerons −
Five roof longerons are
utilized within this assembly to join the FS
230.50 upper aft frame assembly, the A-frame
assembly, and the forward deck skin. These
longerons are primary structural components
that support upper deck loads in the vertical
and longitudinal directions.
The roof longerons, the shear cleats, and the
attachment cleats are fabricated from alumi­
num alloy sheet.
Longeron Reinforcing Angles −
The longeron
reinforcing angles are primary structural
installed at the the aft ends of the LBL and
RBL 18.50 longerons. The longeron reinforcing
angles are fabricated from aluminum alloy
sheet.
Cabin Seat Forward Upper Support Assem-
bly −
Within the roof assembly, the cabin seat
forward upper support assembly contains the
secondary structural components that provide
the attachment for the passenger seats.
This assembly includes bracket assemblies,
cleat assemblies, bearing plates, and anchor
plates. These components are installed on the
underside of the horizontal webs of the left and
right roof beams, and against the lower
flanges of the longeron components of the
forward roof structure.
The detail components within this assembly
are fabricated from aluminum alloy sheet. All
components are installed with rivets.
Aft Engine Attachment Assemblies −
The
left-hand and right-hand aft engine attach­
ment assemblies installed within this installa­
tion are primary structural components that
provide the provisions for attachment of the
forward leg of the bipod engine mounts.
Each aft engine attachment assembly consists
of a fitting and a flanged bushing machined
from titanium alloy stock. The flanged
bushings are standard corrosion resistant
steel. The bushings are press fit installed into
each fitting, and then reamed to final hole
size.