The dependence E _ { h } ( N _ { e } ) of Extensive Air Shower ( EAS ) hadronic component energy flux on the number N _ { e } of particles in EAS is investigated in the primary energy range of the order of 10 ^ { 15 } -10 ^ { 17 } eV .
The work was aimed at checking the existence of irregularities of E _ { h } ( N _ { e } ) / N _ { e } behavior at these energies in several independent experiments .

The investigation is carried out using large statistical material obtained at different configurations of experimental apparatus and under different triggering conditions .

The existence of irregularities of E _ { h } ( N _ { e } ) / N _ { e } behavior in the region N _ { e } > 2 * 10 ^ { 6 } is confirmed .
These irregularities have the character of sharp deeps and are located near the same values of N _ { e } regardless of the experimental material and selection conditions used .
So , at recent stage of research the existence of these irregularities of E _ { h } ( N _ { e } ) / N _ { e } behavior in the range of N _ { e } > 2 * 10 ^ { 6 } may be regarded as reliably established .
This fact supports our earlier conclusion on the existence of primary cosmic radiation ( PCR ) nuclei spectra cutoff effect in the primary energy region 10 ^ { 15 } -10 ^ { 17 } eV [ 1 , 4 ] .