This opinion, which contradicted the Air Force Report, was not investigated further by the Ecuadorian government. A second parliamentary inquiry, led by socialist MP Victor Granda, was formed in 1990 to review the findings of the Arosemena commission and the military investigations. The final 26-volume report, published in August 1992, found several inconsistencies and voids in the initial findings but didn’t establish a definitive conclusion. It criticized the Arosemena commission for its lack of further investigation into the Zurich police findings. Granda has also questioned former President Osvaldo Hurtado (who had succeeded Roldós) for its failure to question or expose the failures of the Ecuadorian Air Force flight security protocols that led to the crash. Specifically, the Granda commission found that in the contracting process of the King Air bought by the Air Force, several high ranking Air Force officers stated that the black box equipment wasn’t acquired with the plane because it was considered “optional” among other spares and equipment (when it should have carried one as it was functioning as presidential transport). The investigation reportedly found that the two additional pages of the acquisition expedient, the ones with the optional equipment list, weren’t rubricated by any officer; so the commission asked the Air Force to demand a certification from Beechcraft to certify if the equipment had indeed been acquired. The Air Force relayed Beechcraft’s response: that they didn’t held any knowledge or registry of having sold or not the black box. According to Granda, this is an element of doubt, as a black box equipment “may have existed”. The American author and activist John Perkins, in his book "Confessions of an Economic Hit Man", asserts that Roldós was assassinated, because his plan to reorganize the hydrocarbon sector would have threatened U.S. interests. The economic relations were strained by Roldos' plan for a new hydrocarbon law not favored by US firms, which reportedly engaged in a lobbying and public relations campaign against Roldós' government amongst Ecuadorean and US politicians, as well as with the religious class; to the point that Roldós accused (without credible evidence) missionaries from the Summer Institute of Linguistics (SIL) of colluding with oil interests, before expelling them from the country. Shortly after sending his legislative package on the oil sector reform, in early 1981, Roldós warned foreign interests that if they wouldn’t contribute to the progress of the Ecuadorian people, they would have to leave the country.