TM 55-1730-229-34
AG 320A0-MME-000
TO 35C2-3-473-2
TM 1730-34/1
CHAPTER 3
MAINTENANCE OF FRAME AND HOUSING
DESCRIPTION.
3-1.
(1) Drill out rivets on damaged
nut plate and remove nut plate.
a. Frame and Housing Components.
The frame and housing (figure 3-1) con-
(2) Clean and paint area under nut
plate.
sists of a frame (one-piece welded),
panels (welded to frame), lifting eyes,
covers, access doors, roof assembly
(3) Install new 10-32 (MS21076L3)
nut plate or 6-32 (MS21076L6) nut plate
(figures 3-2 and 3-9) , exhaust ejector
with rivets (3/32 x .125/.250 grip).
assembly (figure 3-10), air intake duct
assembly (figure 3-11), and engine/
e. Replace damaged or missing weld
pins (to retain acoustic insulation).
b. Frame Construction. The frame
(1) Remove self-locking washers
is constructed of steel channel pieces
welded together to form a unitized, one-
retaining acoustic insulation and remove
piece assembly. Steel panels are welded
insulation section.
to the frame assembly to form the hous-
ing. Four lifting eyes are attached to
(2) If applicable, remove damaged
the frame assembly. A roof assembly is
weld pin.
attached to the housing by two latches
on each end of the roof.
An exhaust
(3) Install new weld pin (83-
flapper is attached to the roof, which
14851-04) using pin welder PW500 (Erico
Jones) or equivalent.
Is opened by exhaust gas from the
exhaust ejector when the engine is
(4) Touchup paint repaired area.
started.
FRAME AND PANELS. The frame and
3-2
f. Replace damaged or missing acous-
l
tic insulation (see figure 3-1).
panels are a welded one-piece unit. The
frame and panels are constructed from
washers
self-locking
1010/1020 steel channel, angle, and
(1) Remove
from weld pins.
sheet stock. Weld per MIL-STD-1261 CL1.
(2) Remove damaged insulation sec-
a. Repair cracks in channels and
tion.
angles by welding.
Repair damaged panels by
b.
(3) Replace any missing or damaged
weld pins.
straightening and welding, or if sev-
erely damaged replace with new sheet
(4) Clean and. paint area behind
stock (cut to size).
insulation section.
c. Clean and paint repaired area in
accordance with paragraph 2-5.
(5) Position replacement insula-
tion section over weld pins and press
into place.
d.
Repair nut plates.
3-1
