TM 1-1520-238-23
15-128
Change 5
15.33.
LEFT TRUSS REMOVAL/INSTALLATION - continued
15.33.3. Removal
a. Remove truss assembly (1) from fittings (2).
(1) Hold two bolts (3). Remove two nuts (4) and
washers (5).
(2) Remove two bolts (3) from truss (1) and fit-
tings (2).
(3) Remove truss (1).
b. Remove two bushings (6) from truss (1).
15.33.4. Cleaning
a. Clean removed and attaching parts (para
1.47).
15.33.5. Inspection
a. Check APU support strut and truss assem-
blies for cracks, dents, scratches, distortion,
loose bolts, and elongated holes.
(1) Fluorescent-penetrant inspect if cracks are
suspected (TM 55-1500-335-23). Replace if
cracks are found.
(2) Scratches 0.010 INCH maximum must be
blended out. Replace if scratches are deeper
than 0.010 INCH.
(3) Dents shall not exceed 0.010 INCH and must
be blended out. Replace if dents are deeper
than 0.010 INCH.
(4) Check the entire length of each weld line for
cracks and any other abnormalities. Use in-
spection mirror as required.
b. Check removed and attaching parts for corro-
sion (para 1.49).
c. Check bushings for elongation and galling.
None allowed.
d. Check the APU support deck fittings for de-
tectable motion, cracks, elongated holes, and
missing hardware (para 15.34). None allowed.
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