CHAPTER 9
REPAIR OF TANK SUPPORT ASSEMBLY
Section I. TANK SUPPORT ASSEMBLY
g. If tiedown lugs (28, fig. 4-2) are attached to
9-1. General
tank support assembly, remove tiedown lugs using figure
The tank support assembly (133, fig. 4-9) consists
(1) Remove cotter pin (25), if in place.
primarily of aluminum alloy channel rail. connected
(2) Remove lock nut (26) and washers (27).
together by aluminum alloy sheet. It is assembled by
(3) Remove tiedown lug (28).
riveting and welding. The tank sup port provides the
base to which the remainder o! the insecticide sprayer is
mounted. It also provides the means for attaching the
9-3. Cleaning, Inspection, and Repair
sprayer to the helicopter.
a. Cleaning.
Clean all portions of the tank
support assembly to remove spray residue, dirt, rust, or
9-2. Disassembly
other foreign matter.
b. Inspection. Inspect all portions of the tank
a. Remove parts from the tank support assembly
support assembly for damage that might impair
per instructions in chapter 5.
b. Remove pump support assembly (107, fig 4-9)
operation of the insecticide sprayer. Check condition of
all threaded parts, and all attachment or mounting holes.
from tank support assembly (133) using figure 4-9 and
Check security of rivets and weldments. Mark any areas
the following steps as guides:
found or suspected of being faulty or in need of repair.
(1) Remove pump struts (91 and 95) as
Inspect security of attachment and condition of felt
follows:
(a) Remove nuts (82), washers (83), and
cushions (124, fig. 4-9) on inside of cradle channels.
c. Repair. Repair tank support assembly only as
bolts (84) securing pump struts to eyebolts (99) in flange
required, noting the following:
of pump support assembly (107).
(b) Remove nut (85), washer (86), and
(1) Repair channel rails and sheet metal
portions by straightening, patching, or replacing any parts
bolt (87) securing long pump strut (91) to eyebolt (90).
found to be faulty. Remove parts by drilling out rivets or
Remove long pump strut.
cutting weldments as required. Cut new pieces to size,
(c) Remove nut (88), washer (89), and
using removed parts as a pattern. Drill new rivet holes in
eyebolt (90) from rear upper channel rail of tank support
exact locations, and deburr holes. Locate parts into
assembly (133).
position, with all joints tight against one and other. Rivet
(d) Remove nut (92), washer (93), and
parts in place per Military Standard MILSTD-403. Check
bolt (94) securing short pump strut (95) to complete
to see that all rivets are securely installed.
removal of short pump strut.
(2) Perform any welding required per Military
(e) Remove nuts (96), washers (97),
Specification MIL-W-45205, Class B.
bushings (98), and eyebolts (99) from flange of pump
(3) Replace felt cushion (124, fig. 4-9) on
support assembly (107).
cradle channel if missing, torn, or badly worn. Center
(2) Complete removal of pump support
cushion on channel and attach to channel with glue.
assembly (107) from tank support assembly (133) by
Allow glue to set before installing tank.
removing nuts (100), washers (101) and bolts (102).
(4) On completion of repair operations,
c. Remove bracket (106) from pump support
reclean tank support assembly thoroughly to remove any
assembly (107) by removing nuts (103), washers (104),
dirt or oil. Treat metal per Military Specification MIL-C-
and screws (105).
5541 and paint per Military Specification MILC-22751C,
d. Remove eight handles (109) from bottom tank
color gray, No. 26231. Corrosion resistant steel parts will
support rails by removing screws (108).
require pretreatment per Military Specification MIL-C-
e. Remove four stray end tiedown fittings (128)
8514.
from upper tank support rails by removing nuts (126) and
(5) Paint area around nine mounting holes in
washers (127).
tank support base used for UH-1D installation (fig. 4-4).
f.
Remove four tank clamps (132) from tank
Use red color No. 31136 per Federal Standard FED-
support cradle channels by removing nuts (129),
STD-595.
washers (130), and screws (131)).
9-1
