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Old 14th April 2018 | 05:42
  #12 (permalink)  
Bergerie1
 
Joined: Apr 2009
: ATPL
Posts: 1,482
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From: A place in the sun
747-100 series UK CAA Certificate of Airworthiness Air Test pressurisation leak rate test, para 7.2.6. At 30,000ft, I quote:-

'With normal cabin diff. put GALLEY/LAV FAN ON and switch all A/C packs to OFF. Record leak rate over 1 minute; 750' maximum. Restore normal pressurisation.
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