1.6 An altimeter which is set to 29.92 in . Hg reads zero feet when the airplane is on the ground at an airport which is \( 1,500 \mathrm{ft} \) above sea-level. The following data are taken during a climb if this airplane:
\begin{tabular}{llll}
\begin{tabular}{l}
Pressure Altitude \\
in ft
\end{tabular} & \begin{tabular}{l}
Temperature, T \\
in deg. F
\end{tabular} & \begin{tabular}{c}
Pressurc Altitude \\
in ft
\end{tabular} & \begin{tabular}{c}
Temperaturc, T \\
in deg. F
\end{tabular} \\
0 & 21 & 6,000 & -1 \\
1,000 & 17 & 7,000 & -5 \\
2,000 & 14 & 8,000 & -9 \\
3,000 & 10 & 9,000 & -13 \\
4,000 & 7 & 10,000 & no reading \\
5,000 & 2 & &
\end{tabular}
If the altimeter reads \( 10,000 \mathrm{ft} \) what will be the actual altitude of the airplane above sealevel? (Hint: Use an average lapse rate.)
