Essential Spare Parts; Spare And Repair Parts - Bell OH-58A Technical Manual

BDAR FIXES SHALL BE USED ONLY IN COMBAT OR FOR TRAINING
(AUTHORIZED TRAINING FIXES ARE LISTED IN APPENDIX E.)
IN EITHER CASE, DAMAGES SHALL BE REPAIRED BY STANDARD
D-1. SCOPE. This appendix contains
lists and tables of substitute materials
and parts which can be used on the OH-58
aircraft for BDAR fixes.
D-2. GENERAL. The lists and tables for
Appendix D are made up of the following:
a. Essential spare parts, Table D-1.
b. Spare and repair parts, Table D-2.
thru D-3.
c. Fuels, Table D-4 thru D-7.
d. Lubricants and hydraulic fluids,
Table D-8.
e. This appendix contains general
information concerning types, uses, and
effects of POL substitutes, and methods
of purging and flushing systems.
f. Some products are made up of che-
mical ingredients which are not com-
patible with products used on an OH-58
aircraft. Some fuels, oils, and
hydraulic fluids can have an adverse
effect on systems and components with
the OH-58 systems; therefore, it is
advisable to properly identify the
product by specification number and name
from cross-reference with primary and
expedient products available.
National stock numbers are used in
g.
conjunction with specification numbers
to distinguish them from foreign pro-
ducts. The identification of (NATO)
product numbers relate directly to U.S.
Military Specification numbers and thus
are considered direct replacements.
APPENDIX D
SUBSTITUTE MATERIALS/PARTS
AT THE DISCRETION OF THE COMMANDER.
PROCEDURES AS SOON AS PRACTICABLE.
Section I. INTRODUCTION
h. In some situations, petroleum, oil,
lubricant (POL) substitute products of
friendly or enemy nations can be used;
however, CAUTION should be exercised due
to the possibility of sabotage. If there
is no other alternative but to use enemy
products, check for signs of contamina-
tion, discoloration, smell and thickness.
i. Once a product under consideration
is identified as described above, it
will fall in one of three categories.
These categories are defined as follows:
(1) Primary products. These are
basic products for which the system was
designed. The system will function
without limitation.
(2) Alternate Product. These are
products that closely match the primary
product and may result in some reduced
performance with no effect on system
durability. There are no limitations on
duration of use.
(3) Emergency/Expedient Products.
(a) These are products that can
be used for only short periods of time.
These products are to be used as a last
resort. These products will cause poor
performance and system damage after pro-
longed use.
(b) It is important that the
distinction between these categories is
understood. Since the choice between
products could mean the difference
between completing the mission and
limping home.
TM 55-1520-228-BD
D-1