Section VII. SENSITIVITY ADJUSTMENT

TM 55-4920-201-14

SECTION VII

SENSITIVITY A D J U S T M E N T

7-1. GENERAL.

ounce-inch is the amount of unbalance (tilting

force) produced by a weight of one ounce acting at

7-2. Sensitivity adjustment, as applicable to

an off-set distance of one inch from the line of

suspension balancers, is the process of determining

suspension or other effective pivot point. (See figure

the correct sensitivity setting for individual

suspension balancer applications. User personnel

7-5. In view A, unbalance force is zero because the

are capable of and need to make only limited

weight of the rigid horizontal bar is equally

sensitivity adjustments due to the very nature of the

distributed on either side of the pivot point. In view

equipment involved. Personnel of all levels can

B, addition of a weight, "w" at a distance "d" from

determine the correct sensitivity setting for an

pivot point introduces a tilting force, "m", ex-

unlisted assembly in accordance with paragraph 7-

pressed numerically as "w" (number of ounces)

16. Ordinarily, however, operators will merely use

times "d" (number of inches) in the general for-

the calibration values stated in the applicable

mula :

propeller or helicopter maintenance manual.

7-3.

MEASUREMENT OF STATIC UN-

m= w x d

Substituting typical values :

BALANCE

FORCES.

m = 2 (ounces) x 6 (inches)

7-4. Relative magnitude of static unbalance forces

m = 12 ounces-inches

is most generally expressed in ounce-inch units. An

7-1