The Multiple Airglow Chemistry (MAC) model was developed to reflect coupling of the identified electronic states of molecular oxygen in the MLT (upper mesosphere and lower thermosphere). The MAC model was tuned and verified using in-situ observations obtained during the WAVE2004 campaign and collocated observations of SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) instrument aboard TIMED (Thermosphere Ionosphere Mesosphere Energetics Dynamics) satellite. Temporal and spatial variability in the used observations was analyzed using all relevant observations obtained during the WAVE2004 campaign. Particularly, the foil chaff and ground-based all-sky imaging indicated the presence of shear instability, and not the presence of convective instability. The evidence of the dynamically (and not statically) unstable regions in the MLT was reflected in the rate profiles of chemical heating derived with the developed MAC model and compared with the reference heating rate profiles obtained using the SABER instrument. The shape of the heating rate profiles is discussed using parameters of atmospheric stability in the MLT. The performed verification and discussion enabled us to conclude that the results of our retrievals and evaluations are consistent with each other and coherent with obtained datasets.