TM 1-1510-262-10
b. Airspeed Calibration - Normal System, I Takeoff Ground Roll.
(1) Description. The Airspeed Calibration - Normal System, Takeoff Ground Roll graph (Fig. 7-2) depicts
the relationship between indicated airspeed and calibrated airspeed for the normal aircraft static air source during
the takeoff ground roll.
(2) Purpose. This graph is used to determine calibrated airspeed for a given indicated airspeed. Data
is provided for up and approach lap settings with the gear down. The indicated airspeed values on this graph
assume zero instrument error.
c. Airspeed Calibration - Normal System.
(1) Description. The Airspeed Calibration - Normal System graph (Fig. 7-3) depicts the relationship be-
tween indicated airspeed and calibrated airspeed for the normal aircraft static air source during light.
(2) Purpose. This graph is used to determine calibrated airspeed for a given indicated airspeed using the
normal aircraft static air system. The data is shown on two graphs. One graph is for airspeeds between 80 and 200
knots with lines for laps down with gear down, laps approach with gear down, and laps approach with gear up.
The other graph is for airspeeds between 100 and 250 knots with lines for laps up with gear down and laps up with
gear up. The indicated airspeed values on this graph assume zero instrument error.
d. Altimeter Correction - Normal System.
(1) Description. The Altimeter Correction - Normal System graph (Fig. 7-4) provides the altitude correc-
tion to be made to the altimeter reading when the normal aircraft static source is being used.
(2) Purpose. This graph is used to determine altimeter correction factors to be added to indicated altitude
for laps settings of up, approach, and down at various indicated airspeeds to ind true pressure altitude for a given
indicated pressure altitude. The indicated airspeed values on this graph assume zero instrument error.
e. Airspeed Calibration - Alternate System.
(1) Description. The Airspeed Calibration - Alternate System graph (Fig. 7-5) depicts the relationship
between indicated airspeed and calibrated airspeed for the alternate aircraft static air source.
(2) Purpose. This graph is used to determine calibrated airspeed for a given indicated airspeed using the
alternate aircraft static air system.
f. Altimeter Correction - Alternate System.
(1) Description. The Altimeter Correction - Alternate System graph (Fig. 7-6) provides the altitude correc-
tion to be made to the altimeter reading when the alternate aircraft static air source is being used.
(2) Purpose. This graph is used to determine altimeter correction factors to be added or subtracted to
indicated altitude for a given indicated airspeed and pressure altitude.
g. Indicated Outside Air Temperature Correction.
(1) Description. The Indicated Outside Air Temperature Correction graph (Fig. 7-7) provides temperature
corrections to be made to indicated free air temperature to obtain true free air temperature.
(2) Purpose. This graph is used to determine the correction factor which must be added to the reading
on the free air temperature gauge to obtain true free air temperature at a given calibrated airspeed and pressure
altitude. The graph assumes standard day (ISA) conditions.
7-2
