Leading Up To The Crash
During a crossing of the continent, Macon was forced to climb to 6,000 ft (1,800 m) to clear mountains in Arizona. As the ship's pressure height—the height at which the gas cells would start to leak and eventually rupture due to pressure difference—was less than 3,000 ft (910 m), a large amount of helium was vented in reaching this altitude. To compensate for the loss of lift, 9,000 lb (4,100 kg) of ballast and 7,000 lb (3,200 kg) of fuel had to be dumped. Macon was being flown 15,000 lb (6,800 kg) "heavy" and was operating at full power not only in order to have sufficient dynamic lift, but to have enough control to fly in the severe turbulence through a mountain pass near Van Horn, Texas. Following a severe drop, a diagonal girder in ring 17.5, which supported the forward fin attachment points, failed. Rapid damage control by Chief Boatswain's Mate Robert Davis repaired the girders before further failures could occur. Macon completed the journey safely but the buckled ring and all four tailfins were judgd to be in need of strengthening. The appropriate girders adjacent to the horizontal and lower fins were repaired, but the repair to the girders on either side of the top fin were delayed until the next scheduled overhaul when the adjacent gas cells could be deflated.
Read more about this topic: USS Macon (ZRS-5)
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