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

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CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 20
Original
53-30-00
D. Anti − Torque Fan Support Structure
(Ref. Figure 9)
The major components included in this
support structure are the fan support ring,
forward frame assembly, aft frame, left and
right duct inner skins, upper and lower
intercostals, and left and right WL 159.00
intercostals, and lower skin web.
Secondary components installed within this
structure include doubler plates and angles,
stiffeners, channels, and standard hardware.
Fan Support Ring
- The fan support ring is
machined from aluminum alloy stock. The fan
support ring contains a peripheral flange that
attaches onto the forward frame assembly.
Three arms provide the attachment for the fan
fairing/centerbody, the support for the fan
bearing housing, and the fan support bearing
housing.
Forward Frame Assembly
- The forward
frame assembly is a primary structural
component that provides for installation and
attachment of the fan support ring. This
component also provides the forward structur­
al interface and support for the anti-torque
fan installation. The forward frame assembly
is fabricated from aluminum alloy sheet.
Aft Frame
- The aft frame is a primary
structural component that provides the aft
structural interface and support for the fan
installation. The aft frame also attaches the
forward end of the fan aft duct assembly. The
aft frame assembly is fabricated from alumi­
num alloy sheet.
Duct Inner Skins −
The left and right duct
inner skins are primary structural components
that provide the attachment and support for
the felt-metal tip seal for the fan assembly.
The left and right inner skins form a circular
ring that is attached to both the forward frame
assembly and the aft frame. The duct inner
skins are fabricated from aluminum alloy
sheet.
Intercostals −
The upper, lower, and left and
right WL 159.00 intercostals are secondary
structural components. The are fabricated
from aluminum alloy sheet.
E. Tailboom Attachment Ring Assembly
(Ref. Figure 9)
The tailboom attachment ring assembly is a
primary structural component that attaches
the tailboom to the aft section of the fuselage.
The inner flange of the ring assembly provides
for attachment of the aft flanges of the upper
and lower anti-torque fan duct assemblies.
The tailboom attachment ring assembly
consists of the tailboom attachment ring,
nutplates, two close tolerance bolts and bolt
retainers. The tailboom attachment ring is
machined from aluminum alloy stock.