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

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CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 9
Original
53-30-00
Engine Mounting Intercostals −
The engine
mounting intercostals are primary structural
components. These components are fabricated
from aluminum alloy sheet.
Valve Mount Bracket Assemblies −
The valve
mount bracket assemblies and intercostals are
secondary structural components that provide
the for mounting of a left and a right engine
fuel supply frangible self-sealing valve.
The left bracket assembly is located immedi­
ately outboard of the LBL 18.50 longeron
between FS 224.53 and FS 227.53. The right
bracket assembly is located immediately
inboard of the RBL 7.75 longeron between FS
216.50 and FS 219.50.
Each valve mount bracket assembly consists of
a valve mount bracket, two tension (mounting)
clips, and standard hardware. The bracket,
tension clips, and intercostals are fabricated
from aluminum alloy sheet.
Mid Roof Straps −
The mid roof straps are
secondary structural components that function
as doublers for the forward roof deck skin. The
straps are located on the forward deck skin
approximately at FS 200 and FS 206. The mid
roof straps are fabricated from aluminum alloy
sheet.
Longeron and Bridging Doublers −
The
longeron and bridging doublers are secondary
structural components that are installed at the
forward ends of each of the roof longerons. The
longeron and bridging doublers are fabricated
from aluminum alloy sheet.
FS 220.50 Deck Skin and Inboard Longeron
Deck Doublers −
The left and right FS 220.50
deck skin doublers and the left and right
inboard longeron deck doublers are secondary
structural components that are installed near
the aft edge of the forward roof deck skin.
The deck skin doublers and inboard longeron
deck skin doublers are fabricated from
aluminum alloy sheet.
Deck Skin Stiffeners and Lower Flange
Channels −
The deck skin stiffeners and
channels are installed on the underside of the
forward roof deck skin.
Two lower flange channels function to support
and stabilize the longerons. The deck stiffeners
and lower flange channels are fabricated from
aluminum alloy sheet.
F. Aft Deck Structure Assembly
(Ref. Figure 5)
The major components contained within the
aft deck structure assembly are the aft section
longerons, aft deck sub-longerons, aft deck
intercostals, aft deck subframe, aft deck insert
frame assembly, and aft deck engine attach­
ment assemblies.
Secondary components include bearing and
doubler plates, radius blocks, attachment,
reinforcing, and stiffening angles, doubler and
attachment cleats, and hardware.
Aft Section Longerons −
The aft section
longerons are primary structural components
that support upper deck loads in the vertical
and longitudinal directions.
The four longerons contained within this
assembly are located at LBL and RBL 18.50,
and at LBL and RBL 7.75. The forward ends
of these longerons terminate and are attached
to the FS 230.50 upper aft frame assembly.
The aft ends of the LBL and RBL 7.75
longerons terminate and attach to the aft deck
insert frame assembly.
The aft section longerons, and secondary
attachment cleats or angles are fabricated
from aluminum alloy sheet.