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

Страница: 1108 / 2144

CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 12
Revision 25
53-20-00
K. Cabin Door Frames Assemblies
(Ref. Figure 2)
The cabin door frame assemblies are second­
ary structural components. These components
support loads in the vertical and lateral
directions. These assemblies attach to the tub
shell and keel beams of the tub assembly, the
edge of the panel that forms the cabin door
opening, and adjacent structure of the roof
assembly. Secondary attachment of these
assemblies is by rivets. Each assembly also
provides for attachment of the cabin floor
panels.
FS 166.50 Door Frame Assemblies −
The left
and right FS 166.50 door frame assemblies are
located along the forward lower edge of the
cabin door openings.
Each assembly consists of an upper frame, a
lower riblet, and secondary attachment angles.
All components within these assemblies,
excluding the hardware, are fabricated from
aluminum alloy sheet. Secondary fastening of
the detail components is by rivets.
FS 218.50 Door Frame Assemblies −
The left
and right FS 218.50 door frame assemblies are
located along the aft edge of the cabin door
openings.
Each assembly consists of a frame, a floor
support channel, a reinforcing angle, and an
attachment cleat. All components within these
assemblies, excluding the hardware, are
fabricated from aluminum alloy sheet.
Secondary fastening of the detail components
is by rivets.
L. Boat Tail Assembly
(Ref. Figure 2)
The boat tail assembly, combined with the tub
assembly, forms the bottom of the fuselage
structure. This assembly attaches mechanical­
ly using rivets to the aft skid attachment
assembly, to the left and right FS 230.50 lower
frame assemblies, and to the lower edge of the
left and right rear fuselage shell assemblies.
The components included in this assembly are
the boat tail tub, the boat tail sills, attachment
cleats, spoiler attachment inserts, and bonded
nutplates.
Boat Tail Tub −
The boat tail tub is a primary
structural component and is the load bearing
skin in the aft lower section of the fuselage.
The boat tail tub is a composite sandwich
panel that utilizes multiple ply graphite/epoxy
skins cocured with a Nomex honeycomb core.
In areas in which secondary attachment of
additional components will occur, the honey­
comb core is tapered and additional reinforce­
ment plies of graphite/epoxy are inlaid. In
areas in which secondary attachment of
metallic components will occur, a barrier ply of
fiberglass/epoxy is cocured to the surface of the
respective skin. On the exterior surface of the
boat tail tub a ply of Astrostrik
is cocured to
the panel.
Boat Tail Sills −
The boat tail sills are second­
ary structural components and are the
provisions for attachment of the lower edges of
the rear fuselage shell assemblies. The sills
also provide the provisions for attachment of
the baggage floor panels.
The sills are composite on aircraft serial
numbers 900-00010 through 900-00028
and are fabricated using multiple plies of
graphite/epoxy cocured as a monolithic
laminates. On
aircraft serial numbers
900-00029 through 900-99999 the sills are
fabricated of aluminum alloy. The sills are
fastened to the boat tail tub by rivets.
Attachment cleats −
The attachment cleats
are secondary structural components and
function as auxiliary attachment provisions for
the boat tail assembly.
The cleats are fabricated from aluminum alloy
sheet. The cleats are fastened to the upper
flange of the boat tail sills by rivets.
Spoiler Attachment Inserts −
The spoiler
attachment inserts are nylon inserts that are
secondarily bonded into cored area of the boat
tail tub panel.