In order to carry out this check without requiring the aircraft's engines, the pressurisation system was set to "manual", and was not set back to "auto" on completion of the test.
The pressurisation system was set to "manual". This was to carry out this check without requiring the aircraft's engines. The pressurisation system was not set back to "auto" on completion of the test. This was to carry out this check without requiring the aircraft's engines.