Originally Posted by
special_ig
Quote:
"Non-recognition that the cabin pressurization mode selector was in the MAN (manual) position during the performance of the Preflight procedure, the Before Start checklist and the After Takeoff checklist"
Does the checklist item "cabin pressurization mode selector to AUTOMATIC" appear in the ALL THREE procedures/checklists??? If so, is it fair to say that the crew missed SIX clues about this switch being in the wrong position (three checklists plus the Cabin Altitude Warning Horn, Passenger Oxygen Masks Deployment indication and the Master Caution signal???)
The standard checklist generally has only AC Press - - - SET (or CHECKED/SET) however upon expansion we have for example in the After Start procedure:
Cruise ALT - - - - - - - - - - SET
Land ALT - - - - - - - - - - - SET
FLT/GRD Switch - - - - - - - GND
Press Mode Selector - - - - AUTO
Auto Fail Light - - - - - - - - OUT
Pressurisation Indicators:
Cabin Diff - - - -- - - - - - - ZERO
Cabin ROC/ROD- - - - - - - - ZERO
Cabin ALT - - - - - - - - - Field Elevation
There are several reasons why this switch could be found in the MAN position and returning the switch to AUTO should not be considered an unusual task.