TM 55-1520-228-BD
CHAPTER 7
ROTORS
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 1. INTRODUCTION
7-1.
SCOPE. This chapter contains the
7-3. ASSESSMENT PROCEDURES. Refer to
fault assessment and expedient repair
Table 7-1.
procedures available to find and fix
battlefield damage to the main and tail
7-4. REPAIR PROCEDURE INDEX.
rotor blades.
PARA.
7-2. GENERAL. The system consisting of
two blade assemblies, each with two
Rotor Blade, Hole 1 Inch
blades, a central hub, and a control
Diameter or Less. . . . . . 7-6
mechanism. The main rotor is driven by
Main Rotor Blade, Hole 1 to 4
the mast which is connected to the
Inches Diameter Maximum . . 7-7
transmission and provides for fore, aft,
lateral, and vertical flight modes. The
tail rotor is driven by the tail rotor
gearbox and provides for directional
control. See Figures 7-1 and 7-2 for
system configuration. Assessment proce-
dures are found in Table 7-1.
Section II. REPAIRS
7-5. GENERAL.
The rotor system does
not lend itself well to limited repairs.
In most instances, the only repair
options for a faulty component will be
to replace or repair by normal proce-
dures. Those limited repairs which
have been developed are listed in this
section.
7-6.
ROTOR BLADE, HOLE 1 INCH
DIAMETER OR LESS.
GENERAL INFORMATION: A small hole
passing through the honeycomb core area,
Figure 7-3, on either a main or tail
rotor blade can be repaired with duct
LIMITATIONS: Adjustment of blade
balance may be required after repair.
Inspection of repaired area after each
flight would be required.
PERSONNEL/TIME REQUIRED:
. 2 Soldiers
. 15 Minutes
MATERIALS/TOOLS REQUIRED:
. Army Green 3 Inch Tape or Aluminized
Tape (item 50, Appx C)
. Cleaning Solvent (item 7, Appx C)
PROCEDURAL STEPS:
tape.
Removal of blade is not necessary. 1. Position blades for access to
damaged area. Support blades to prevent
movement and droop.
7-1
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