Page:NTSB Southern Airways Flight 932 report.pdf/36

 of the aircraft at the time the reference calls were made, and adding these calls to that elevation, the following tabulation shows (1) the first officer's callout, (2) the flight recorder indication, (3) terrain elevation, and (4) the altitude, if a radio altimeter was being used (terrain plus the callout).

Based on the above points, the following rates of descent would be required:

It is noted that the rates of descent calculated for the flight recorder data are in an increasing pattern and relatively close to the overall rate described by the flight recorder. The rates of descent based on the calculated radio altimeter callouts show close correlation for the initial two call-outs, but in the final segment the descent rate is approximately double the overall rate.

After carefully weighing the conflicting points set forth above, the Board concludes that the theory under consideration -- namely, that the unrecognized descent through MDA was the result of using the radio altimeter