An aircraft object mounting system is formed from three light weight honeycombed metal plank sections--a longitudinally central section and a pair of upturned end sections removably secured thereto. The end sections have bomb racks thereon to which various weaponry, such as machine guns, rocket launchers or missiles, may be attached. The central section is secured to the underside of a helicopter, with small lug structures on the central section extending upwardly into the aircraft cabin area and secured to bulkheads therein. The object mounting system is thus positioned essentially entirely externally to the aircraft and only minimally intrudes into the interior thereof. The mounting system may be used to support non-weaponry objects, and may be utilized with aircraft other than helicopters.