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Description of Driving Event:

During the pre-modification pressure test, the contractor had a difficult time in reaching the full pressure test value. The clam shell doors were open and the aft seals around the door were inverted and letting air escape. The contractor was preparing to get additional compressors when it was noticed that the skin of the aircraft appeared to be bowed. The test was immediately halted and NASA requested that the pressure gauges be checked for proper calibration. The contractor discovered that the gauges were out of calibration and were reading a lower pressure and it was determined that they had actually reached the full test pressure value and even exceeded this value.