TM 55-1520-228-BD
ENVIRONMENTAL CONTROL SYSTEM
2.
Wrap glass tape several turns around 3. Record BDAR action taken. When
duct to cover hole or tear.
Tape should
mission is completed or as soon as
extend beyond damaged area 3 to 4 inches
feasible, replace duct using standard
in each direction.
maintenance procedures.
Section III. BLEED AIR LINE DAMAGE
15-7.
GENERAL INFORMATION. Damage to
some bleed air lines may be repairable.
SYMPTOM: Loss of Engine Torque and/or
High Engine Oil Temperature.
LIMITATIONS:
Inspect after every
flight.
PERSONNEL/TIME REQUIRED:
●
1 Soldier
●
1 Hour
MATERIALS/TOOLS REQUIRED:
●
Sheet Metal Patch - 0.016 in. Min.
●
Sealing Compound (item 4, Appx C)
●
Aluminum Tape (item 60, Appx C)
●
Clamps 0.032 inch or Safety Wire
0.042 inch (item 27, Appx C)
PROCEDURAL STEPS:
1.
Locate damaged area and remove
panels and other items as necessary to
gain access to the line to be repaired.
Refer to Figure 15-6 for locations of
bleed air lines.
2.
Cut patch from aluminum sheet metal
to cover hole or other damage. Patch
should extend approximately 1 inch from
the edge of the hole or damage at all
points if possible.
3.
Apply sealant around the hole area
to be covered by the patch.
4.
Place patch in position, and make
sure patch fills the contour of the
line.
5.
Secure metal patch in place using
hose clamp, Figure 15-7. If hose
clamps are not available, secure in
place with safety wire. Turn pigtail
to line.
6.
Wrap aluminum tape around the
repair. Tape should cover at least 2
inches beyond the edge of repair.
7.
Record BDAR action taken. When
mission is complete, as soon as
practical, repair the equipment/system
using standard maintenance procedures.
15-9
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