Seat assemblies and methods for changing a passenger sitting angle according to aircraft flight mode
A method for changing passenger seating angle according to an aircraft flight mode utilizing a raked passenger seat configuration in which the seat angle relative to an aircraft longitudinal axis increases as the passenger seat transitions from an upright condition to a reclined condition. Such a passenger seat may be utilized in an aircraft passenger seating arrangement to maximize seating density while complying with defined taxi, takeoff and landing (TTOL) certification criteria for oblique seats, among other applications and benefits.
1. A method for effecting a passenger sitting angle change according to an aircraft flight mode, comprising the steps of:
providing a passenger seat including a seat back and a seat bottom, wherein the passenger seatis adjustable between an upright configuration and a reclined configuration, wherein adjusting the passenger seat between the upright configuration and the reclined configuration induces a change in passenger sitting angle relative to an aircraft longitudinal axis;
positioning the passenger seat in an aircraft at a fixed seat installation angle that is angled relative to the aircraft longitudinal axis, wherein the passenger seat is not rotatable about a vertical axis;
during a flight condition of the aircraft, adjusting the passenger seat from the upright configuration to the reclined configuration to increase the passenger sitting angle relative to the aircraft longitudinal axis; and
in preparation for a taxi, takeoff or landing (TTOL) condition of the aircraft, adjusting the passenger seat from the reclined configuration to the upright configuration to decrease the passenger sitting angle relative to the aircraft longitudinal axis;
wherein:
the passenger sitting angle, when the passenger seat is in the upright configuration, is no greater than 45° relative to the aircraft longitudinal axis;
the passenger sitting angle, when the passenger seat is in the reclined configuration, is greater than 45° relative to the aircraft longitudinal axis; and
the seat bottom is shaped as a parallelogram and a forward end of the seat bottom is laterally shifted relative to the seat back.
2. The method according to claim 1 , wherein, when the passenger seat is in the upright configuration, the passenger sitting angle corresponds to a TTOL compliant condition of the passenger.
3. The method according to claim 1 , wherein the passenger seat further includes a deployable leg rest.
4. An aircraft passenger seating arrangement, comprising:
a longitudinal aisle oriented parallel to an aircraft longitudinal axis;
spaced walls positioned to one side of the longitudinal aisle; and
a passenger seat positioned between the spaced walls;
wherein:
the passenger seat includes a seat back and a seat bottom, wherein the passenger seat is adjustable between an upright configuration and a reclined configuration;
adjusting the passenger seat between the upright configuration and the reclined configuration induces a change in passenger sitting angle relative to the aircraft longitudinal axis;
the passenger seat is installed adjacent to and positioned facing the longitudinal aisle, wherein the passenger seat is installed at a fixed seat installation angle, and wherein the passenger seat is not rotatable about a vertical axis;
adjusting the passenger seat from the upright configuration to the reclined configuration increases the passenger sitting angle relative to the aircraft longitudinal axis; and
adjusting the passenger seat from the reclined configuration to the upright configuration decreases the passenger sitting angle relative to the aircraft longitudinal axis;
wherein:
the passenger sitting angle, when the passenger seat is in the upright configuration, is no greater than 45° relative to the aircraft longitudinal axis;
the passenger sitting angle, when the passenger seat is in the reclined configuration, is greater than 45° relative to the aircraft longitudinal axis; and
the seat bottom is shaped as a parallelogram and a forward end of the seat bottom is laterally shifted relative to the seat back.
5. The aircraft passenger seating arrangement according to claim 4 , wherein, when the passenger seat is in the upright configuration, the passenger sitting angle corresponds to a TTOL compliant condition of the passenger.
6. The aircraft passenger seating arrangement according to claim 4 , wherein the passenger seat further includes a deployable leg rest.