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

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CSP

−

900RMM

−

MD Helicopters, Inc.

Rotorcraft Maintenance Manual

Page 4
Revision 27

53-40-00

detail components are composite and are
secondarily bonded to form the assembly using
a high temperature epoxy adhesive.

E. Upper and Lower Airfoils

The upper and lower airfoils are air entrance
control devices on the interior surface of the
tailboom assembly for the air circulation
control slots. The upper airfoil is installed
parallel to and immediately above the leading
edge of the slat assembly. The lower airfoil is
installed parallel to and immediately below
the trailing edge of the slat assembly. Each
airfoil is secondarily bonded and faired to the
interior surface of the tailboom.

The upper and lower airfoils are composite
assemblies consisting of an airfoil skin and
several integral support ribs. All components
within each assembly are fabricated as
monolithic laminates using multiple plies of
graphite/epoxy.

F. Slot Vanes

The slot vanes function as airflow straighten
ers for the anti-torque fan air exiting the air
circulation control slots on the tailboom
assembly. In the upper air circulation control
slot, sixteen slot vanes are installed equally
spaced between the trailing edge of the upper
airfoil and the leading edge of the slat assem
bly. In the lower air circulation control slot,
sixteen slot vanes are installed equally spaced
between the trailing edge of the slat assembly
and the leading edge of the lower airfoil. Each
slot vane is secondarily bonded. The slot vanes
are nonmetallic components fabricated from
polycarbonate plastic sheet.

G. Upper and Lower Inlet Ramps

The upper and lower inlet ramps function as
air entrance control devices at the forward
ends of the air circulation slots on the interior
surface of the tailboom assembly. The upper
inlet ramp is installed at the forward end of
the upper air circulation control slot and
overlaps the upper airfoil and leading edge of
the slat assembly. The lower inlet ramp is
installed at the forward end of the lower air
circulation control slot and overlaps the
trailing edge of the slat assembly, the lower
airfoil, and the forward coaxial cover. Each
inlet ramp is secondarily bonded and faired to

the interior surfaces of the tailboom, mating
surfaces of the airfoils, and slat assembly. The
upper and lower inlet ramps are both nonme
tallic components fabricated from polycarbo
nate plastic sheet.

H. Forward Coaxial Cover, Aft Coaxial

Cover, and Aft Wiring Cover

The coaxial and wiring covers allow coaxial
cable and wiring to enter and exit the tailboom
assembly without allowing air to escape. The
forward coaxial cover is installed below the
forward end of the lower air circulation control
slot and attached to the forward end or the
lower airfoil. The lower inlet ramp overlaps
the upper part of the forward coaxial cover.
The aft coaxial cover and aft wiring cover are
installed at the aft end of the slat assembly
and lower airfoil assembly. Each cover is
secondarily bonded and faired to the interior
surfaces of the tailboom, mating surfaces of
the airfoils, and slat assembly. The forward
coaxial cover, aft coaxial cover, and aft wiring
cover are both nonmetallic components
fabricated from polycarbonate plastic sheet.

I. Fuselage Attachment, Empennage

Attachment Frames, and Intercostals

The fuselage attachment frame is located at
the forward end of the tailboom assembly, and
provides for attachment of the tailboom
assembly to the tailboom attachment ring
assembly. The forward and aft empennage
attachment frames are located at the aft end
of the tailboom assembly, and contain the
provisions for attachment of the horizontal
stabilizer and thruster assemblies. The left
and right intercostal assemblies are installed
between the forward and aft empennage
attachment frames adjacent to the provisions
for attachment of the horizontal stabilizer.

The fuselage, and forward and aft empennage
attachment frames, are machined from
aluminum alloy stock. The left and right
intercostals are fabricated from aluminum
alloy sheet. The fuselage attachment frame is
installed using titanium pins and aluminum
collars. The forward and aft empennage
frames are installed using titanium blind
fasteners. The intercostals are installed using
a combination of titanium pins and aluminum
collars, and titanium blind fasteners.

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

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