A direct measurement of the nitric oxide mixing ratio between 43 km and 61 km was made with a rocket-borne chemiluminescent detector. This was the second flight in a series of two designed primarily to determine feasibility. The rocket was launched at Wallops, Island, Virginia on 19 March 1976 at 14:15 EST. The ozone-generated background signal was monitored throughout the flight by periodically interrupting the atmospheric sample flow with a pure-N2 bias-supply gas. An extensive error analysis was performed to evaluate the uncertainty in our results. The discovery of computational and calibration-gas concentration errors required us to reanalyze the results from the first flight of this detector in 1975; the corrected results are reported here. A comparison of the results from the two flights is made.