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AFMAN15-111 12 MARCH 2019 67
13.5.1. Pressure Measurement Instrumentation. Obtain pressure data using an instrument from
the following priority list. When using back-up equipment, follow the procedures in the
applicable T.O. or user’s manual and treat all values as estimated (see paragraph 13.4.1 for
exception).
13.5.1.1. AN/FMQ-19, Automatic Meteorological Station (AMS).
13.5.1.2. AN/FMQ-22/23 AMS.
13.5.1.3. Automated Surface Observing System (ASOS).
13.5.1.4. AN/TMQ-53, Tactical Meteorological Observing System.
13.5.1.5. Altimeter Setting Indicator (ASI).
13.5.1.6. Aircraft altimeter.
13.5.1.7. Other MAJCOM-approved device.
13.5.2. Station Pressure. Determine the station pressure by taking a direct reading, and if
necessary, applying the posted pressure correction obtained during a scheduled barometer
comparison.
13.5.3. Altimeter Setting. Read directly from the pressure measuring device.
13.5.3.1. If a direct readout of the primary method is unavailable, ASLTG is computed
using the current station pressure value and the locally designated method (e.g. online
forecaster tools found on AFW-WEBS and OWS websites, pressure reduction calculator,
ALSTG quick reference chart).
13.5.3.2. If required for international aviation purposes, use Table 13.2 to convert values
from iHg to hPa.
