TB 9-5210-213-50
6. Preliminary Instructions
process. Personnel should become familiar with the entire bulletin before beginning the
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Additional maintenance information is contained in the manufacturer's manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
a. Remove equipment from their cases.
b. Carefully examine all machined surfaces for nicks, burrs, and any other signs of
damage and deburr as needed.
c. Ensure that all machined surfaces are clean.
NOTE
Allow bubble to settle 15 seconds before taking a reading.
NOTE
Make certain no one is propping or leaning on the surface plate.
a. Performance Check
(1) Place TI on surface plate and against a parallel bar that has been clamped to the
clamping ledge of the surface plate, this will ensure repeatable observations.
(2) Note the reading, and rotate the TI 180.
(3) If this reading is not the same magnitude and direction as the first reading
perform b below.
(4) If the two readings are the same magnitude and direction, then the surface plate
is out of level. Bring the surface plate into a level condition by removing half the error as
observed on the TI vial with the surface plate leveling screws. Rotate the TI 180 and again
remove one half the error with the surface plate leveling screws. Repeat this technique till
no further improvement can be seen.
