TM 55-1520-228-BD
CHAPTER 12
FUEL 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.
12-1. GENERAL.
a. The fuel supply system, Figure
12-1, consists of a crashworthy bladder
type, self-sealing cell. The fuel cell
is designed to fit under the passenger
seat, in the floor cavity of the fuse-
lage.
The system’s fuel flow lines are
self-sealing.
The rigid lines are used
for fuel flow or as vent lines. The
fuel boost pump is the cartridge type
which can be replaced without defueling.
b.
The fuel tank will self-seal when
damaged by small arms projectiles up to
50 caliber.
Damage to the tank and the
Section II.
12-4. GENERAL.
a. Replacement lines and hoses need
not be routed along the path of the ori-
ginal installation. They may be routed
along any convenient path as long as
they do not interfere with personnel or
with operating equipment.
Long lines
and hoses should be clamped to hard sup-
ports at convenient intervals not
exceeding 24 inches.
b.
Tubing in the OH-58 fuel system is
limited to the fuel vent line. When
damage occurs to any of the lines (tubes
or hoses), they may be substituted with
a flexible type hose from the kit.
c. If hose assemblies from the kit
are not available, damage may be cut out
and replaced with a small section (refer
to repair procedures), or a replacement
INTRODUCTION
fuel system must be evaluated
very care-
fully to determine damage which requires
immediate repair and that which does not
constitute a flight hazard.
12-2. ASSESSMENT PROCEDURES. Refer to
Table 12-1.
12-3.
REPAIR PROCEDURE INDEX.
PARA.
Hose and Line Replacement. . . 9-7
O-Ring Damage. . . . . . . . . 9-10
Fuel Substitution. . . . . . . 12-6
Fuel Cell Repair . . . . . . . 12-7
LINES AND HOSES
hose may be manufactured if a long
enough hose section and MS fittings are
available (refer to repair procedures).
d.
Never discard MS fittings, they
are reusable. The MS21922 sleeve is not
reusable.
12-5. O-RING DAMAGE. Refer to Chapter
9, paragraph 9-10. The same criteria
that applies to hydraulic o-rings also
applies to o-rings in the fuel system.
12-6.
FUEL SUBSTITUTIONS.
a. If the standard fuel is not avail-
able, a substitute fuel must be used.
Check Appendix D for a compatible fuel.
b.
Record BDAR action taken. When
mission is complete, as soon as
practical, repair the equipment/system
using standard maintenance procedures.
12-1
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