TB 9-4920-465-24
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
PNEUMATIC PRESSURE Range: -0 to 23 psia 0 to 8.7 psig
DHI, Model RPM-
STANDARD NO. 1
Accuracy: 0.0625 %
4A160KP/A160KPAD
PNEUMATIC
Range: 0 to 25 psi
Druck, Model DPI 515
PRESSURE STANDARD
Accuracy: (r0.0625 % FS 10 psi to 300 psi)
NO. 2
(r0.0625 % FS below 10 psi)
THERMOMETER
Azonix, Model A1012
Range: -31 to +212qF
(MIS 38958) w/Temperature
Accuracy: 0.5q%
Probe Instrulab, Model 4101-
10X
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
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.
Adjustments required to calibrate the TI are included in this procedure. 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.
a. Allow the TI to stand with the case open near the place it is to be calibrated for
5 minutes.
b. Connect pneumatic pressure standard no. 1 to the TO BIM NIPPLE port located in
the upper right-hand corner of TI's instrument control panel.
c. Set pneumatic pressure standard no. 1 to gage mode and units psi and press the
auto z button to zero the pressure standard.
a. Performance Check
(1) Set the pneumatic pressure standard no. 1 to absolute mode and units in-Hg.
Record the reading on the pneumatic pressure standard no. 1 in in-Hg. This should be the
Momentarily press the HOLD key on the BLADE
present barometric pressure.
PRESSURE indicator. Record the reading on the BLADE PRESSURE indicator.
(2) Calculate the difference between readings by subtracting the recorded numbers.
These values should agree to within 0.18 in-Hg.