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The WC-135 Constant Phoenix is a special purpose aircraft derived from the Boeing C-135 and used by the United States Air Force. Its mission is to collect samples from the atmosphere for the purpose of detecting and identifying nuclear explosions. It is also informally referred to as the "weather bird" or "the sniffer" by workers on the program.
|Role||Atmosphere Testing Related to Nuclear Incidents|
|Manufacturer||Boeing Military Airplanes Division|
|Primary user||United States Air Force|
|Number built||10 original WC-135B, plus 1 converted former EC-135C (2 still in service)|
|Developed from||C-135 Stratolifter|
|Variants||OC-135B Open Skies|
The WC-135W (tail number 61-2667) is a modified C-135B. The WC-135C (tail number 62-3582) is an extensively modified former EC-135C Looking Glass aircraft. The Constant Phoenix’s modifications are primarily related to the aircraft's on-board atmospheric collection suite, which allows the mission crew to detect radioactive debris "clouds" in real time. The aircraft is equipped with external flow-through devices to collect particulates on filter paper and a compressor system for whole air samples collected in high-pressure holding spheres.
The interior seats 33 people, including the cockpit crew, maintenance personnel, and special equipment operators from the Air Force Technical Applications Center. On operational sorties, the crew is minimized to just pilots, navigator, and special equipment operators, to reduce radiation exposure to mission-essential personnel only.
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