were inaccessible without dismantling the wings and fuselage; even relatively minor repairs had to be made at rear echelon repair depots. Spare parts became difficult to obtain during the summer of 1917, resulting in the reduction of No. 1 Naval Squadron's complement from 18 to 15 aircraft. According to Bruce, it is plausible that squadrons were slow to refit their Triplanes with the improved tailplane due to a lack of available kits for doing so. The Triplane also gained a reputation for structural weakness because the wings of some aircraft collapsed in steep dives. This defect was attributed to the use of light gauge bracing wires in the 46 aircraft built by subcontractor Clayton & Shuttleworth. Several pilots of No. 10 Naval Squadron used cables or additional wires to strengthen their Triplanes. Bruce alleges that there was no substance to the concerns of structural weakness. In 1918, the RAF issued a technical order for the installation of a spanwise compression strut between the inboard cabane struts of surviving Triplanes. One aircraft, serial N5912, was fitted with additional mid-bay flying wires on the upper wing while used as a trainer. Another drawback of the Triplane was its light armament. Contemporary Albatros fighters were armed with two guns but most Triplanes carried one synchronised Vickers machine gun. Efforts to fit twin guns to the Triplane met with mixed results. Clayton & Shuttleworth built six experimental Triplanes with twin guns. Some of these aircraft saw combat service with Nos. 1 and 10 Naval Squadrons in July 1917 but performance was reduced and the single gun remained standard. Triplanes built by Oakley would have featured twin guns, an engineering change which severely delayed production. Withdrawal from service In June 1917, No. 4 Naval Squadron received the first Sopwith Camels and the advantages of the sturdier, better-armed fighter quickly became evident. Nos. 8 and 9 Naval Squadrons re-equipped with Camels between early July and early August 1917. No. 10 Naval Squadron converted in late August, turning over its remaining Triplanes to No. 1 Naval Squadron. No. 1 operated Triplanes until December, allegedly suffering heavy casualties as a consequence of the slow replacement of their Triplanes. By the end of 1917, surviving Triplanes were used as advanced trainers with No. 12 Naval Squadron. For a time, the type remained in use for experimental and training purposes; examples were recorded as performing flights as late as October