Section II. CALIBRATION

TB 55-4920-329-35

Section II. CALIBRATION

lists required accessories. Tables 1 and 2 are provided

6. Equipment and Accessories Required. Table

to assist in the selection of required equipment and

1 lists minimum use specifications of equipment required

accessories. For specific item identification refer to

for calibration performances checks and adjustments.

Section III.

Table 2

Table 1. Minimum specifications of equipment required

Item

Common name

Minimum use specifications

No.

TACHOMETER, TEST

RANGE: 0-1500 RPM

SET

ACCURACY: + .5%

TORQUE, CALIBRATOR

RANGE: 10-230 lb @ 5 ft

ACCURACY: + 2%

BALANCE, WEIGHT

RANGE: 5-150 Lb, class C.

SET

STANDARD, WEIGHT

RANGE: 140 Lb, class C.

SET

FRACTIONAL,

Class C,

WEIGHT SET

Table 2. Accessories required

Item No

Common name

Description

SPLINE ADAPTER

To be fabricated as shown in figure 2

LEVEL

Bench type

(2) Connect torque calibrator (A2) to spline

7. Preliminary Procedure.

adapter. The horizontal plane of the arm on the torque

calibrator should be from 20 to 5° above level as shown

Note. Personnel should familiarize themselves with the

in figure 1.

entire bulletin prior to performing calibration.

(3) Lock brake on UUT by turning LOAD

a. Visually inspect UUT for any physical signs of

control handle clockwise (in toward control panel).

damage.

(4) Add weights from weight sets (A3, A4, AS)

b. Fabricate spline adapter as shown in figure 2.

to weight carrier until the indications listed in Table 3 are

obtained.

Note. When the UUT is not within tolerance, perform the

specified adjustments and continue performance check.

(5) The indications observed on the UUT

When the UUT is not within tolerance and no adjustment

should not exceed the limits specified in Table 3.

is specified, the deficiency must be corrected before

continuing with the procedure.

Note. If an out-of-tolerance condition was observed

during the preceding performance check, annotate DA

8. Torque Indicator.

Form 2416 in accordance with TM 38-750.

a. Performance Check.

b. Adjustments. No adjustments can be made.

(1) Connect spline end of spline adapter (B1)

onto splined output shaft of UUT as shown in figure 1.