TM 55-1520-240-23-3
4-69
REPAIR ENGINE AIR INLET SCREEN AND BYPASS PANELS MAJOR REPAIRS (AVIM)
4-69
INITIAL SETUP
Applicable Configurations:
All
Tools:
As Required
Materials:
As Required
Personnel Required:
Aircraft Structural Repairer
Inspector
References:
AMS 5680
SAE-AMS-STD-2219
Task 2-349
Task 2-352
Task 2-367
Task 4-64
Task 4-65
Task 4-66
Task 4-67
Task 4-68
Task 4-68.1
Task 4-68.2
Task 4-68.3
Task 4-68.4
Task 4-69
Task 4-76
TB 746-93-2
TM 1-1500-204-23
Equipment Condition:
Off Helicopter Task
General Safety Instructions:
As Required
Anytime a screen is damaged in
different areas, and same strand of
wire is impacted by those areas, care
must be taken to make sure repairs
secure the wire along its entire length
across the screen.
NOTE
Aircraft with 40 , have 0.020 fine
mesh screen installed over 0.063
coarse mesh screen on the upper and
lower engine inlet only.
1.
Repair screen material as follows:
a.
Remove screen assembly from engine. Refer
to Tasks 4-64 and 4-65.
b.
Before repairing screen material, make sure
screen is cleaned (Task 4-66) and existing
finish removed from affected area.
c.
If fine mesh material on inlet screen is not
badly abraded or opened, repair as follows:
(1)
If abrasion of screen does not exceed
half the thickness of the wire, sand the
surfaces smooth and refinish the screen
(Tasks 2-349 and 2-352).
(2)
If only a few strands of screen are
badly abraded or separated, tac weld
(SAE-AMS-STD-2219) across the defect
with 0.020, AMS 5680 wire.
d.
Proceed as follows if fine mesh screen is
badly abraded, opened, or separated:
NOTE
If screen was previously patched in
area recently damaged, or repair
requires overlapping an older repair
with a new one, the new repair should
encompass new and old areas with
removal of the old patch.
If numerous repairs have already
been made to the screen, the screen
assembly should be replaced.
(1)
Cut out damaged area to form a square
or rectangular hole, cutting each side of
the hole along and on the damaged side
of good strands of wire.
(2)
Bend back strands from cut wires to first
good cross strand along each side of the
hole.
(3)
Weld (SAE-AMS-STD-2219) the cut and
bend back strands to the cross strands
with 0.020, AMS 5680 wire.
4-300
