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Support aircraft3 aircraft in service (WC-135R)
Atmosphere testing related to nuclear incidents
Boeing WC-135 Constant Phoenix is a atmosphere testing related to nuclear incidents. It was built by Boeing Military Airplanes Division. Reported operators include United States Air Force.
United StatesBoeing WC-135 Constant Phoenix
Ken H / @chippyho · CC BY-SA 2.0 · Resized · CC BY-SA 2.0 · Source ↗ · ModifiedAtmosphere testing related to nuclear incidents
Boeing Military Airplanes Division
3 aircraft in service (WC-135R)
United States Air Force
14 (10 converted C-135B, one converted EC-135C, three converted KC-135R)
December 1965
Boeing C-135 Stratolifter
Boeing OC-135B Open Skies
4 flight crew + mission crew
139 ft 11 in (42.65 m)
130 ft 10 in (39.88 m)
42 ft (13 m)
2,433 sq ft (226.0 m 2 )
300,500 lb (136,305 kg)
4 × Pratt & Whitney TF33-P-9 (WC-135C) / Pratt & Whitney TF33-P-5 (WC-135W) turbofan engines, 16,050 lbf (71.4 kN) thrust each
403 mph (649 km/h, 350 kn)
4,000 mi (6,400 km, 3,500 nmi)
40,000 ft (12,000 m)
root: BAC 310/311/312; tip: BAC 313
123.5 lb/sq ft (603 kg/m 2 )
0.21
WC-135R Constant Phoenix Boeing USA Jet Atmospheric research Manned 2022 (WC-135R) 3
Reference text from Wikipedia contributors, used under CC BY-SA 4.0.
True scale
Sourced dimensions beside a 1.75 m human reference.
Points represent sourced observations, including revisions. Revisions on the same effective date are not separate inventory events. Ranges appear in the table and are not plotted as exact points.
| Observation / report period | Value | Source | Claim state |
|---|---|---|---|
| 28 Sept 2026 | 42.65 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 42.65 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 42.65 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 42.65 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 42.65 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 42.65 m | Wikipedia contributors | approved |
Boeing WC-135 Constant Phoenix equipment records. Variants, orders and quantities are shown as reported in each inventory source; coverage is incomplete.
United StatesUS Air Force WC-135R Total Aircraft Inventory holdings as of 30 September 2025, including Active Force, Air National Guard and Air Force Reserve Command. This covers the named source row only, not all variants in the family or all United States services. Inventory includes aircraft not immediately deployable; it is not a combat-readiness count.