Bell OH-58A - Page 256

TM 55-1520-228-BD
ENVIRONMENTAL CONTROL SYSTEM
PROCEDURAL STEPS:
3.
Stop drill any cracks which might be
extending from hole.
1.
Locate damaged area and remove
panels and/or other items as necessary
Sand both the bottom surface of the
to gain access to the duct to be
patch and the surface area around the
repaired. Refer to Figures 15-2 and
hole to be covered by the patch.
15-3 for locations of rigid plastic
ducts.
5.
Clean surface with solvent.
2. Cut a patch out of sheet stock.
6. Apply sealant to patch and on the
surface area that will be covered by the
3. Tape into place.
patch.
4. Record BDAR action taken. When
mission is complete, as soon as
practical, repair the equipment/system
using standard maintenance procedures.
OPTION 2: Hole or Crack in Duct, Rigid
Plastic.
7. Press patch in place, and wrap glass
tape around patch and duct to hold the
repair in position.
8.
Record BDAR action taken. When
mission is complete, as soon as
practical, repair the equipment/system
using standard maintenance procedures.
LIMITATIONS:
Inspect after every flight.
15-6. FLEXIBLE DUCT DAMAGE.
PERSONNEL/TIME REQUIRED:
1 Soldier
1 Hour
MATERIALS/TOOLS REQUIRED:
0.016 inch Sheet Metal Minimum
Sealant (item 4, Appx C)
400 Grit Sand Paper (item 45, Appx C)
Cleaner Naptha or Equivalent
(item 7, Appx C)
Glass Tape or Aluminum Tape
(item 60, Appx C)
PROCEDURAL STEPS:
1.
Locate damaged area and remove
panels and/or other items as necessary
to gain access to the duct to be
repaired. Refer to Figures 15-2 and
15-3 for locations of rigid plastic
ducts.
2.
Cut a patch out of sheet stock.
Patch should extend 1-1/2 inches from
the edge of the hole at all points.
GENERAL INFORMATION: The flexible ducts
are composed of special wire covered
fabric with impregnated rubber.
LIMITATIONS:
These repairs are tem-
porary and the damaged hoses should be
replaced as soon as possible.
Inspect
after every flight.
PERSONNEL/TIME REQUIRED:
1 Soldier
15 Minutes
MATERIALS/TOOLS REQUIRED:
Glass Tape or Equivalent
PROCEDURAL STEPS:
1.
Locate damaged area and remove panels
and/or other items as necessary to gain
access to the duct to be repaired.
Refer
to Figures 15-2 and 15-3 for locations of
flexible plastic ducts.
15-8
4.