TB 9-4920-463-24
(3) Adjust 900 RPM adjust (fig.1) until next ring on the rotor disc appears stopped.
Frequency counter will indicate 15 1 Hz.
(4) Set TI MOTOR ON switch to down position.
(5) Disconnect lead from magnetic pickup on TI.
(6) Replace two opposite pairs of interrupter screws on TI rotor disc.
b. Adjustments. No further adjustments can be made.
9. Final Procedure
NOTE
The number of TI's (Models 11 or 11A) in the set may vary. After
calibrating the last TI, do not disconnect the magnetic pickup and
accelerometers, if proceeding to Section IV of the procedure.
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
CALIBRATION PROCESS FOR BALANCE PHAZOR, MODEL 177M-6A AND
BLADE TRACKER, MODEL 135M-11
10. Preliminary Instructions
a. The instructions outlined in paragraphs 10 and 11 are preparatory to the
calibration process. Personnel should become familiar with the entire bulletin before
beginning the calibration.
b. 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.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for this TI.
c. Unless otherwise specified, all controls and control settings refer to the TI.
11. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUTS(S) to minimum after each step within the
performance check where applicable.
NOTE
The magnetic pickup and two accelerometers supplied with TI
should already be connected to the Vibrex tester as in
paragraph 7 a above.
