SECTION I IDENTIFICATION AND DESCRIPTION

TB 9-5220-211-50

SECTION I

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification.

This bulletin provides instructions for the

calibration of Sine Plate, Type II, Grade A, Class 2, 5-Inch (GGG-B-121B). Specification

GGG-B-121B was used as the prime data source in compiling these instructions. The sine

plate will be referred to as the TI (test instrument) throughout this bulletin.

a. Model Variations. None

b. Time and Technique. The time required for this calibration is approximately 1

hour, using the physical technique.

2. Forms, Records, and Reports.

a. Forms, records, and reports required for calibration personnel at all levels are

prescribed by TB 750-25.

b. No adjustments to be reported.

3. Calibration Description. TI parameters and performance specifications which

pertain to this calibration are listed in table 1.

Table 1. Calibration Description

Test instrument parameters

Performance specifications

Length

5″ 0.00010 in.

Parallelism of rolls

0.000050 in.

Parallelism of working surfaces

0.00010 in.

EQUIPMENT REQUIREMENTS

4. Equipment Required. Table 2 identifies the specific equipment used in this

calibration procedure. This equipment is issued with Secondary Reference Calibration

Standards Set 4931-00-621-7878. Alternate items may be used by the calibrating activity.

The items selected must be verified to perform satisfactorily prior to use and must bear

evidence of current calibration. The equipment must meet or exceed the minimum use

specifications listed in table 2. The accuracies listed in table 2 provide a four-to-one

accuracy ratio between the standard and TI. Where the four-to-one ratio cannot be met, the

actual accuracy of the equipment selected is shown in parenthesis.

CHANGE 1

PIN: 010264-001

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