TB 9-4935-558-40
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Hold Back Test Fixture TA 20/14 10682724 and 1045515. Drawing 10682724
was used as the prime data source in compiling these instructions. The hold back test
fixture will be referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. Variations among models are described in text.
b. Time and Technique. The time required for this calibration is approximately one
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. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
3. Calibration Description.
Test instrument parameters
and
performance,
specifications which pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Force dimension and load
Dimension between end of slider and bottom of dowel pins with
95 lbs. force applied shall be 2.1515 0.001 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, NSN 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 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.
5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this
calibration procedure. The following peculiar accessories are also required for this
calibration: Calibration stand, SK-D-4850-106 and C-clamp, SK-D-4850-105.