ANSWER: I am assuming that when you say "fly upside down" you mean sustained inverted flight like an aerobatic airplane.
The answer is flatly, No.
Inverted flight requires a specific airfoil (wing shape) as well as specific lubrication systems for the engines. Transport category aircraft are not built to engage in inverted flight.
If, however, your question relates to the ability fly inverted for only a few seconds. Then I believe the answer would be yes.
Any airworthy aircraft should be able to complete a 1G barrel roll at the hands of a well trained pilot proficient in the maneuver. A properly executed 1G barrel roll will not over-stress the aircraft or affect lubrication in anyway. The danger is that an improperly executed barrel roll can get out of control very quickly.
The master of this maneuver was Bob Hoover who used to execute 1G barrel rolls in a twin-engine aircraft with one engine shut down WHILE pouring a cup of iced tea into a cup which was sitting up on the glareshield (dash) of the aircraft.
The Airbus, being a fly-by-wire aircraft has limitations in place that would prohibit the execution of this maneuver, but with special procedures these limiting system can be disabled.
The answer is flatly, No.
Inverted flight requires a specific airfoil (wing shape) as well as specific lubrication systems for the engines. Transport category aircraft are not built to engage in inverted flight.
If, however, your question relates to the ability fly inverted for only a few seconds. Then I believe the answer would be yes.
Any airworthy aircraft should be able to complete a 1G barrel roll at the hands of a well trained pilot proficient in the maneuver. A properly executed 1G barrel roll will not over-stress the aircraft or affect lubrication in anyway. The danger is that an improperly executed barrel roll can get out of control very quickly.
The master of this maneuver was Bob Hoover who used to execute 1G barrel rolls in a twin-engine aircraft with one engine shut down WHILE pouring a cup of iced tea into a cup which was sitting up on the glareshield (dash) of the aircraft.
The Airbus, being a fly-by-wire aircraft has limitations in place that would prohibit the execution of this maneuver, but with special procedures these limiting system can be disabled.
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