Fluorescence lifetimes have been measured under supersonic jet conditions for various N, K-rotational levels of three vibrational levels (T, T+nu(2), and T+nu(3)) of the (B) over tilde (2)A' state of CCH. It was found that the lifetimes of levels T+nu(2) and T+nu(3) are significantly shorter than that of level T. Furthermore, the lifetimes vary in a complicated way from one rovibronic level to another, indicating the presence of local perturbations. The previously reported CC-H bond energy ranges from 95.6 to 116.3 kcal/mol, which leads to a large uncertainty in assigning the onset of the dissociation process, CCH ((X) over tilde (2)Sigma(+))--> C-2(X (1)Sigma(g)(+))+H(S-2(1/2)). In this work, fluorescence excitation spectra of photofragment C-2 via D (1)Sigma(u)(+)<--X (1)Sigma(g)(+) and d (3)Pi(g)<-- a (3)Pi(u) have been recorded to determine the predissociation processes of the (B) over tilde state. Assuming no barrier is present in the dissociation process of the (X) over tilde and (A) over tilde states, the upper bound of D-0(0)(CC-H) was estimated as 39 388 +/- 7 cm(-1)(similar or equal to 112.62 kcal/mol). Hence, the lifetime quenching phenomenon observed in the (B) over tilde state is primarily due to predissociation via the dissociative continuum of either the (X) over tilde or the (A) over tilde state of CCH.