Classifier Instance:

Anchor text: decompression chamber
Target Entity: Pressure_vessel
Preceding Context: From 1947 to 1948, de Havilland conducted an extensive research and development phase, including the utilisation of several stress test rigs at Hatfield for small components and large assemblies alike. More rigorous testing was a development priority because the Comet represented a new category of passenger aircraft. Sections of pressurised fuselage were subjected to high-altitude flight conditions via a large
Succeeding Context: onsite, and tested to failure. However, tracing fuselage failure points proved difficult with this method, and de Havilland ultimately switched to conducting structural tests with a water tank that could be safely configured to increase pressures gradually. The entire forward fuselage section was tested for metal fatigue by repeatedly pressurising to overpressure and depressurising through more than 16,000 cycles, equivalent to about 40,000 hours of airline service. The windows were also tested under a pressure of , above the normal service ceiling of . One window frame survived , about 1,250% over the maximum pressure it was expected to encounter in service.
Paragraph Title: Testing and prototypes
Source Page: De Havilland Comet

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