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Summary

Summary

During the climb, while passing through flight level (FL) 180 for FL190, the flight crew of the Beechcraft 1900D aircraft observed the illumination of the CABIN ALT HI warning annunciator and the flashing Master Warning light. The cabin altimeter was indicating 9,800 ft and gradually increasing, with a 500 ft/min cabin rate of climb noted on the cabin vertical speed indicator. The pilot in command contacted air traffic control (ATC) and requested an immediate descent to FL 140. An initial clearance was received to descend to FL160. As the aircraft reached that level, the crew noted that the indicated cabin altitude was approaching 12,500 ft. The crew then advised ATC that they required a further descent to FL140.

 
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