The Principality of Zeon's plan to assault the Earth Federation Forces' ground bases produced considerable results in the first landing operation. Among them, the most noteworthy is the amazing speed of grasping the control base centered on the mobile suit. The Earth Federation Forces' air force and ground forces were quickly driven into a situation where they could hardly compete with this armored mobile weapon. However, the Zeon ground forces, which controlled the landing points with "points", had no choice but to rely on supplies from orbit, and it was not easy to expand the logistics line. The initial goal is to suppress the existing military strategic points of the Earth Federation Forces.
The Gau attack aircraft carrier, which is responsible for transport and bombing in the Earth Attack Force, was good at transporting power, but unfortunately, the mobile suit paratroopers had no choice but to fly at a slow speed, and in such a situation, the Earth Federation Forces' existing air force was reduced. There were many occasions when they became prey. This led to the idea of enhancing the mobile suit's mobility. The plan, which was elaborated in several stages, improved the mobility of the mobile suit itself, and proposed a combined operation plan using medium-sized bombers (the hoverboat plan was integrated into the YMS-09 plan). ). The latter has been proven in conjunction with the Do-Dai YS medium-sized bomber, and it can be said that this operation has been established as a means of transporting mobile suits since then.
The purpose of the former was to focus on how to quickly move mobile suit forces to the front lines, and surprisingly, to give the mobile suits themselves the ability to fly. Zimat has already begun development of the YMS-09, which is equipped with a thermonuclear jet engine for ground movement, and Zeonic has made a prototype by giving it such flight capabilities based on the previously adopted MS-07. started. The Principality of Zeon, which had already gained control over a wide area centered on the California base on the North American continent, has assigned the production line to MS-07A, so this aircraft MS at the 29th industrial colony on Side 3 of the home country. Started trial production of -07H type. The development team was formed with Colonel Isaac Wumiak appointed from the Mobile Assault Force. It was individually transported from satellite orbit by HLV on the replenishment route. After arriving at the California base shuttle base, the materials were transported to Flatnail Air Force Base in Arizona to join a team of six test pilots led by Air Force Capt. Billy Wong Dyke. As a fixed armament, the machine is equipped with B-type 5-barrel 75mm machine guns (the bullet feeder is changed to a large-capacity one) in both arms, but since it is a machine for flight purposes, it is not for melee combat, but for melee combat. Development adjustments were advanced as a heavy attack aircraft whose main purpose was warfare.
An eight-week production test was scheduled, but in fact, at this point, the operation of the Dodai YS was almost decided for the actual mid-range movement plan of the MS (the production test was conducted almost at the same time). rice field). In other words, Zeon General Headquarters was only conducting experiments in the category of mobile suits that could fly.
In fact, in the actual operation test at this Flat Nail base, it was difficult to synchronize the second propulsion engine of the fuselage and the leg propulsion engine, and the test was continued only with Unit 3, which was relatively well adjusted. Development continued until H-4, but an accident occurred during mid-altitude flight tests for Unit 4, and the development plan was discontinued. After these MS-07H (units 1 to 3) were requisitioned at the California base at the end of the war, they were converted to 09 type thermonuclear jet engines at the Jaburo test center of the Earth Federation Forces, and were used as research objects. became.