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will not control the outflow valves and depressurize the airplane when the pressurization system is
being operated in the manual mode. Further, the Safety Board believes that the FAA should
review all Airbus Industrie A300-600 operators’ operating manuals and training programs and
require revisions, if necessary, to ensure that they clearly indicate that the Ram Air switch will not
control the outflow valves and depressurize the airplane when the pressurization system is being
operated in the manual mode.
The Airbus Industrie A300-600 operating manual states that maximum differential
pressure13 at landing should not exceed 1 pound per square inch (psi) and that the Ram Air switch
should not be selected ON when the differential pressure exceeds 1 psi. These design limitations
ensure that the airplane is not rapidly depressurized, which could cause passenger discomfort.
Further, according to the Airbus Industrie A300-600 operating manual, the cabin doors should
not be opened unless the cabin differential pressure is 0 psi because any pressure in the airplane
would make operation of the doors difficult and could result in an opening similar to the one that
occurred during this accident.
The Airbus Industrie A300-600 On Ground/Emergency Evacuation Checklist and the
American Airlines A300 Ground Evacuation Checklist do not require the flight crew to ensure
that the cabin differential pressure is 0 psi before signaling the flight attendants to begin the
emergency evacuation (and, therefore, open the doors). Further, because the American Airlines
training program for the A300-600 airplane only covers the information in the American
Airlines A300 operating manual, the training program also fails to address this issue. The Safety
Board notes that an additional item in the ground evacuation checklist directing the flight crew to
check the differential pressure before signaling the flight attendants to begin the emergency
evacuation would have alerted the accident flight crew that a pressurization problem existed.
Therefore, the Safety Board believes that the FAA should require that the Airbus Industrie A300-
600 On Ground/Emergency Evacuation Checklist direct flight crews to ensure that the cabin
differential pressure is 0 psi before signaling flight attendants to begin an emergency evacuation.
Further, the Safety Board believes that the FAA should review all Airbus Industrie A300-600
13 Differential pressure, indicated by a cabin differential pressure gauge on the pressurization panel in the
cockpit, is the difference between the pressure inside the airplane and that outside the airplane.
6
operators’ checklists and training programs for emergency ground evacuation and require
revisions, if necessary, to ensure that they direct flight crews to verify that the cabin differential
pressure is 0 psi before signaling flight attendants to begin an emergency evacuation.
Parking Checklist
The accident airplane was not parked at a gate; therefore, the pilots did not perform a
parking checklist. However, the Safety Board notes that during its investigation of this accident,
a safety issue related to parking checklists was identified that requires the FAA’s attention.
The Parking Checklist in the Airbus Industrie A300-600 operating manual contains an
item requiring the flight crew to ensure that the cabin differential pressure is 0 psi before
permitting the flight attendants or gate agents to open the cabin doors upon arrival at the gate.
However, the Parking Checklist in the American Airlines A300 operating manual does not contain
this item. Further, because the American Airlines training program for the A300-600 airplane
only covers the information in the American Airlines A300 operating manual, the training program
also fails to address this issue. The Safety Board is concerned that a similar accident could occur
anytime the cabin doors are opened and the cabin differential pressure has not been verified at 0
psi. Therefore, the Safety Board believes that the FAA should review all Airbus Industrie A300-
600 operators’ checklists and training programs for parking and require revisions, if necessary, to
ensure that they direct flight crews to verify that the cabin differential pressure is 0 psi before
permitting flight attendants or gate agents to open the cabin doors upon arrival at the gate.
Therefore, the National Transportation Safety Board recommends that the Federal
Aviation Administration:
Require that the Airbus Industrie A300-600 operating manual clearly state that
(1) automatic depressurization of the airplane upon landing will not occur when
the pressurization system is being operated in the manual mode; (A-01-16) and
(2) the Ram Air switch will not control the outflow valves and depressurize the
　
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