First Penning trap mass measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ca</mml:mi><mml:mprescripts /><mml:none /><mml:mn>36</mml:mn></mml:mmultiscripts></mml:math>

Isobaric quintets provide the best test of isobaric multiplet mass equation (IMME) and can uniquely identify higher order corrections suggestive isospin symmetry breaking effects in nuclear Hamiltonian. The Generalized IMME (GIMME) is a novel microscopic interaction theory that predicts an extension to quadratic form IMME. Only $A=20, 32$ $T=2$ have exotic $T_z = -2$ member ground state determined high-precision by Penning trap spectrometry. In this work, we establish $A=36$ as third quintet with measured spectrometry first predictive power GIMME. A radioactive beam neutron-deficient $^{36}$Ca was produced projectile fragmentation at National Superconducting Cyclotron Laboratory. thermalized $^{36}$Ca$^+$ $^{36}$Ca$^{2+}$ Time Flight - Ion Resonance method LEBIT 9.4 T trap. We measure excess be ME$ -6483.6(56)$ keV, improvement precision factor 6 over literature value. new datum considered together evaluated data on $A=36$, quintet. find agreement given symmetry, but only coarse qualitative predictions total three their most members GIMME $T 2$ appear break down for $A greater.