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Investigation of pressurization incidents in the fleet has indicated that some
operators are setting the FLT ALT before takeoff to an intermediate altitude and
then resetting the FLT ALT one or more times during climb until the final cruise
altitude or flight level is reached. Although this method of operation also provides
a safe and comfortable cabin altitude for the duration of the flight, there are some
considerations which may make this method of operation less desirable:
• Multiple adjustments of the FLT ALT unnecessarily increase crew
workload during climb.
• Intermediate FLT ALT settings are likely to result in higher cabin altitudes
than if the final planned cruise flight altitude is selected. This is because
the pressure schedule for lower altitudes uses lower differential pressure
limits.
• If the flight crew does not reset the FLT ALT when appropriate, flying
above the selected FLT ALT can result in an overpressure situation and
activation of the pressure relief valves.