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6 The American Airlines A300 Cabin Pressurization Manual Control Checklist is similar to that of Airbus.
The entire checklist cannot be performed at one time; rather, pilots must initiate the checklist and then complete it
later in flight. According to the accident captain, he did not perform all of the items in the Cabin Pressurization
Manual Control Checklist because of his other priorities at the time, including addressing the smoke indications
and landing the airplane.
7 Illumination of a cargo loop light may indicate a fire in the cargo compartment. No evidence of fire was
found in the Safety Board’s postaccident examination of the airplane.
8 The American Airlines A300 Ground Evacuation Checklist, which is contained in the American Airlines
A300 operating manual, is similar to the Airbus A300-600 On Ground/Emergency Evacuation Checklist.
9 The description for this accident, MIA01FA029, can be found on the Safety Board’s Web site at
<http://www.ntsb.gov>.
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Pressurization System
Airplane pressurization systems can be operated in automatic and manual modes. The
manual mode of operation, which is considered by both the Airbus A300-600 and American
Airlines A300 operating manuals10 to be an abnormal procedure, is used on the A300-600 airplane
when the automatic mode becomes inoperative and allows the flight crew to manually operate the
electric motors that control the outflow valves. The Airbus A300-600 and American Airlines
A300 Cabin Pressurization Manual Control Checklists, which are contained in the companies’
respective operating manuals, both address the manual mode of the pressurization system. With
the pressurization system in the automatic mode, the airplane is pressurized upon landing, but the
outflow valves automatically open slowly (and depressurize the airplane) within 45 seconds of
landing, assisting in passenger comfort. However, with the pressurization system in the manual
mode, the airplane does not automatically depressurize after landing because the automatic
operation of the electric motors that open and close the outflow valves is inhibited. Therefore,
when operating the airplane’s pressurization system in the manual mode, the flight crew must fully
open the outflow valves as indicated in the Cabin Pressurization Manual Control Checklist by
selecting the Cabin Vertical Speed Control switch to the UP position before landing to ensure that
the airplane is depressurized.
As indicated earlier, the accident captain began performing the items in the Cabin
Pressurization Manual Control Checklist but did not complete the checklist, including the item
that instructs pilots to select the Cabin Vertical Speed Control switch to the UP position to open
the outflow valves and depressurize the airplane before landing. The captain indicated that he did
not complete the checklist because of his other priorities at the time. During postaccident
interviews with Safety Board investigators, the pilots of the accident airplane stated that they
were not aware that the airplane would not automatically depressurize after landing because this
issue was not mentioned in the operating manuals or during training.
The investigation confirmed that the pressurization system description section in the
Airbus Industrie A300-600 operating manual does not state that the airplane will not
automatically depressurize after landing if the pressurization system is being operated in the
manual mode. The investigation also confirmed that the American Airlines A300 operating
manual does not contain this information. 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 because of the lack of information in the Airbus
Industrie A300-600 operating manual and the American Airlines A300 operating manual and
training program about this issue, flight crews of Airbus Industrie A300-600 airplanes might be
unaware that the airplane does not automatically depressurize upon landing when the
pressurization system is in the manual mode. Although proper completion of the Cabin
Pressurization Manual Control Checklist should result in the airplane being depressurized upon
10 The manufacturer’s operating manual provides flight crewmembers with information on the technical,
procedural, and performance characteristics of the aircraft. This manual is suitable for training and may be used as
a crew manual or to aid operators in developing operating manuals and procedures.
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landing, the Board’s experience has shown that pilots sometimes do not properly complete
　
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