Comet Wilson was observed from the Kuiper Airborne Observatory on two flights, 23.64 and 25.59 April 1987 UT (⋍3 and 5 days after perihelion) using the NASA-Ames faint object grating spectrometer. Spectrophotometric data were obtained with a 21-arc sec diameter aperture (⋍10,000 km at the comet) between 5 and 13 μm with a spectral resolving power of 50-120. Spectra of the inner coma reveal a fairly smooth continuum with evidence of silicate emission. The 5- to 8-μm color temperature of the comet was 300 ± 10 K. All three spectra obtained show an unidentified emission feature at ⋍12.25 μm and ⋍0.25 μm wide. No outburst activity was observed. We derive a simple expression relating the color temperature and equilibrium temperature to the IR absorption efficiency QIR, and use it to derive Q IR ⋍ 0.50 and mean grain radius a ⋍ 0.50 μ m.