## 4 Results and Discussions
### Meta-Analysis Test
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Engines**} & \multicolumn{6}{c}{**Air Supply Subsystem**} \\ \hline \multirow{2}{*}{**Engines**} & \multicolumn{2}{c}{**Downtime**} & \multicolumn{2}{c}{**Total Run**} & \multirow{2}{*}{**Outcome**} & \multirow{2}{*}{**S.E.**} & \multirow{2}{*}{**Rate**} & \multirow{2}{*}{**W**} & \multirow{2}{*}{**W**\(\times\) ES**} & \multirow{2}{*}{**W**\(\times\) ES2**} & \multirow{2}{*}{**Level of Heterogeneity**} \\  & \multicolumn{2}{c}{**Hours**} & & & & & & & & & (\(i^{2}\)) \\ \hline
1 & 18.5 & 30,641 & 0.000604 & 0.00014 & 0.06 & 50,749,777.35 & 30,641 & 18.5 & \\
2 & 26 & 27,857 & 0.000933 & 0.000183 & 0.09 & 29,846,632.65 & 27,857 & 26 & 2.23\% \\
3 & 21 & 29,520 & 0.000711 & 0.000155 & 0.07 & 41,496,685.71 & 29,520 & 21 & \\ \hline \multicolumn{10}{c}{**Self-Starting subsystem**} \\ \hline \multirow{2}{*}{**Engines**} & \multicolumn{2}{c}{**Downtime**} & \multicolumn{2}{c}{**Total run**} & \multirow{2}{*}{**Outcome**} & \multirow{2}{*}{**S.E.**} & \multirow{2}{*}{**Rate**} & \multirow{2}{*}{**W**} & \multirow{2}{*}{**W**\(\times\) ES**} & \multirow{2}{*}{**W**\(\times\) ES2**} & \multirow{2}{*}{**Level of Heterogeneity**} \\  & \multicolumn{2}{c}{**Hours**} & & & & & & & & (\(i^{2}\)) \\ \hline
1 & 46.5 & 30,641 & 0.001518 & 0.000223 & 0.15 & 20,190,772 & 30,641 & 46.5 & \(-\)170.23\% \\
2 & 47.5 & 27,857 & 0.001705 & 0.000247 & 0.17 & 16,337,104 & 27,857 & 47.5 & which is taken \\
3 & 42 & 29,520 & 0.001423 & 0.00022 & 0.14 & 20,748,343 & 29,520 & 42 & as 0 \\ \hline \multicolumn{10}{c}{**Fuel supply subsystem**} \\ \hline \multirow{2}{*}{**Engines**} & \multicolumn{2}{c}{**Downtime**} & \multicolumn{2}{c}{**Total run**} & \multirow{2}{*}{**Outcome**} & \multirow{2}{*}{**S.E.**} & \multirow{2}{*}{**Rate**} & \multirow{2}{*}{**W**} & \multirow{2}{*}{**W**\(\times\) ES**} & \multirow{2}{*}{**W**\(\times\) ES2**} & \multirow{2}{*}{**Level of Heterogeneity**} \\  & \multicolumn{2}{c}{**Hours**} & & & & & & & (\(i^{2}\)) \\ \hline
1 & 33 & 30,641 & 0.001077 & 0.000187 & 0.10 & 28,450,633 & 30,641 & 33 & \(-\)452.77\% \\
2 & 25.5 & 27,857 & 0.000915 & 0.000206 & 0.09 & 23,515,529 & 2,1525.86 & 19.70 & which is taken \\
3 & 28.5 & 29,520 & 0.000965 & 0.000195 & 0.09 & 26,406,982 & 25,494.55 & 24.61 & as 0 \\ \hline \multicolumn{10}{c}{**Lubrication subsystem**} \\ \hline \multirow{2}{*}{**Engines**} & \multicolumn{2}{c}{**Downtime**} & \multicolumn{2}{c}{**Total run**} & \multirow{2}{*}{**Outcome**} & \multirow{2}{*}{**S.E.**} & \multirow{2}{*}{**Rate**} & \multirow{2}{*}{**W**} & \multirow{2}{*}{**W**\(\times\) ES**} & \multirow{2}{*}{**W**\(\times\) ES2**} & \multirow{2}{*}{**Level of Heterogeneity**} \\  & \multicolumn{2}{c}{**Hours**} & & & & & & & (\(i^{2}\)) \\ \hline
1 & 34 & 30,641 & 0.00111 & 0.00019 & 0.11 & 27,613,849 & 30,641 & 34 & \(-\)52.67\% \\
2 & 38.5 & 27,857 & 0.001382 & 0.000223 & 0.13 & 20,156,168 & 27,857 & 38.5 & \(-\)52.67\% \\
3 & 41.3 & 29,520 & 0.001399 & 0.000218 & 0.13 & 21,100,010 & 29,520 & 41.3 & is taken as 0 \\ \hline \multicolumn{10}{c}{**Cooling subsystem**} \\ \hline \multirow{2}{*}{**Engines**} & \multicolumn{2}{c}{**Downtime**} & \multicolumn{2}{c}{**Total run**} & \multirow{2}{*}{**Outcome**} & \multirow{2}{*}{**S.E.**} & \multirow{2}{*}{**Rate**} & \multirow{2}{*}{**W**} & \multirow{2}{*}{**W**\(\times\) ES**} & \multirow{2}{*}{**W**\(\times\) ES2**} & \multirow{2}{*}{**Level of Heterogeneity**} \\  & \multicolumn{2}{c}{**Hours**} & & & & & & (\(i^{2}\)) \\ \hline
1 & 25 & 30,641 & 0.000816 & 0.000163 & 0.08 & 37,554,835 & 30,641 & 25 & \\
2 & 28.1 & 27,857 & 0.001009 & 0.00019 & 0.10 & 27,616,101 & 27,857 & 28.1 & \(-\)58.85\% \\
3 & 32 & 29,520 & 0.001084 & 0.000192 & 0.10 & 27,232,200 & 29,520 & 32 & is taken as 0 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Level of Heterogeneity (\(i^{2}\)) values of all five subsystems. The failure data of all five subsystems of the engine showed consistency by confirming CBH test.