TM 55-1520-228-BD
CHAPTER 15
ENVIRONMENTAL CONTROL SYSTEM
BDAR FIXES SHALL BE USED ONLY IN COMBAT OR FOR TRAINING
AT THE DISCRETION OF THE COMMANDER.
(AUTHORIZED TRAINING FIXES ARE LISTED IN APPENDIX E.)
IN EITHER CASE, DAMAGES SHALL BE REPAIRED BY STANDARD
PROCEDURES AS SOON AS PRACTICABLE.
Section I. INTRODUCTION
15-1.
SCOPE. This chapter contains
BDAR procedures for the heat and vent,
bleed air, and defogging systems. The
OH-58A/C has one of three types of heat
systems: bleed air, Figures 15-1 thru
15-3; combustion heater, Figure 15-4;
or shroud heater system, Figure 15-5.
15-2. GENERAL.
a. The three systems consists of air
mixing valve, air distribution ducts,
defroster nozzles, and control switches
to operate system.
c. The shroud heater system utilizes
a carbon monoxide (CO) indicator located
at the instrument panel in full view of
the pilot.
WARNING
If CO indicator is noted to be
dark, turn off heater, pull fire-
wall shut-off open vents, and
land as soon as practicable.
15-3. ASSESSMENT PROCEDURES. Refer to
Table 15-1.
b.
The heat and vent system is pro-
15-4. REPAIR PROCEDURE INDEX.
vided for crew comfort. This aids the
mission proficiency; however, the air-
PARA.
craft capability is not contingent on
system operation.
The aircraft is fully Rigid Plastic Ducts. . . . . . 15-5
flight capable without the system being
Flexible Ducts . . . . . . . . 15-6
operable.
Bleed Air Lines. . . . . . . . 15-7
Section II. RIGID PLASTIC VENTILATION DUCT
15-5. GENERAL INFORMATION: Some damage
PERSONNEL/TIME REQUIRED:
to plastic ducts is repairable provided
1 Soldier
the time required to gain access to the
1 Hour
damaged duct is feasible.
MATERIALS/TOOLS REQUIRED:
OPTION 1:
Hole or Crack in Duct, Rigid
Sheet Metal Patch, 0.016 inch
Plastic.
Thickness Minimum
Tape, Army Green or Aluminum
LIMITATIONS:
Inspect after every flight.
(item 50, Appx C)
15-1
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