
V-6
February 2008
Legacy
V-7
February 2008
Legacy
AIRSPEED SYSTEM CALIBRATION
Airspeed pitot and static system calibrations can be obtained while flying against
the pacer aircraft. Pitot systems can also be calibrated by flying between two
known locations (fixes), in opposite directions carefully measuring the time and
air temperature then working back from true airspeed to a calibrated value. (The
altimeter system should be calibrated prior to this test.) Ideally the wind should be
calm, along the flight path, and the test run at relatively low altitude to minimize
the timing errors due to fix passage factors. LORAN, DME, and GPS can all be
used effectively when the DME station slant range is minimal. A test leg from 50
to 75 miles from the station and return would be acceptable.
This calibration data can be plotted as lines (faired thru the data scatter) on the ac-
companying charts and tagged as to flap position (up, approach and full, typically)
and gear position, or presented in tabular form for each configuration. The data
should be taken from the lowest practical speed to maximum in approximately 20
knot increments. If the chart method is used, it would be prudent to plot the data,
fair a smooth line thru that data, then plot the faired line data to reduce data acqui-
sition scatter. Thus data obtained at 154 kts for example could be “corrected” and
tabulated at 150 or 160 kts.
A sample chart is shown as well as a blank suitable for your use. It is suggested
that you initially plot your data on the sample chart and when satisfied with that
transfer it to your own blank.
Example Data
Airspeed Calibration Data Samples
Cruise Configuration
Actual
IAS
KTS/MPH
Add
Calibrated
CAS
KTS/MPH
80
+5
85
90
+5
95
100
+4
104
110
+2
112
120
0
120
130
-1
129
etc.
etc.
Landing Configuration
Actual
IAS
KTS/MPH
Add
Calibrated
CAS
KTS/MPH
70
-5
65
80
-5
75
90
-4
86
100
-2
98
110
0
110
120
+3
123
etc.
etc.
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