Abstract: A method is disclosed for operating a navigation system with a graphic display of a north-pointing map section of a digital road map. A map section to be displayed includes a current position and at least one section of a route to a specified destination. A selection sequence selects the displayed map section. The selection sequence uses a double frame, which is positioned on a start position on the digital road map. The double frame is repeatedly displaced in at least one direction with respect to the digital road map. The map section to be displayed is selected when a condition for a termination of the selection step sequence is met.

Abstract: A method is disclosed for operating a navigation system with a graphic display of a north-pointing map section of a digital road map. A map section to be displayed includes a current position and at least one section of a route to a specified destination. A selection sequence selects the displayed map section. The selection sequence uses a double frame, which is positioned on a start position on the digital road map. The double frame is repeatedly displaced in at least one direction with respect to the digital road map. The map section to be displayed is selected when a condition for a termination of the selection step sequence is met.

Abstract: An apparatus for pressurizing an aircraft cabin structure and measuring the amount of leakage of the aircraft cabin structure comprises an air supply line which at a first end is connectable to a pressurized air source and which at a second end is connectable to the aircraft cabin structure so as to supply pressurized air from the pressurized air source into the aircraft cabin structure, an air supply valve disposed in the air supply fine, a pressure sensor for sensing the pressure inside the aircraft cabin structure and for providing signals indicative of the pressure inside the aircraft cabin structure, an air discharge line which at a first end is connectable to the aircraft cabin structure and which at a second end is connectable to an air discharge opening so as to discharge air from the inside of the cabin structure to the air discharge opening and an air discharge valve disposed in the air discharge line.

Abstract: The present invention relates to a method for testing power lines and signal lines onboard of an aircraft, wherein the power lines and signal lines normally connect a 3-phase AC motor with the power supply system of the aircraft, and wherein the 3-phase AC motor has separate input terminals onto which, during operation of the 3-phase AC motor onboard of the aircraft, predetermined voltages of predetermined phase difference are to be applied. The method according to the invention comprises the steps of connecting the power lines and signal lines with input terminals (24) of a testing equipment (1), in place of the 3-phase AC motor; applying voltages on the power lines and signal lines; conducting a voltage test, and simultaneously with the voltage test, a phase test by the testing equipment (1) in respect of whether the voltages and the phase difference of the voltages applied to the power lines and signal lines is equal to the predetermined voltages and the predetermined phase difference.

Abstract: An apparatus (10) for pressurising an aircraft cabin structure (12) and measuring the amount of leakage of the aircraft cabin structure (12) comprises an air supply line (14) which at a first end is connectable to a pressurized air source and which at a second end is connectable to the aircraft cabin structure (12) so as to supply pressurized air from the pressurized air source into the aircraft cabin structure (12), an air supply valve (36) disposed in the air supply line (14), a pressure sensor (50) for sensing the pressure inside the aircraft cabin structure (12) and for providing signals indicative of the pressure inside the aircraft cabin structure (12), an air discharge line (42) which at a first end is connectable to the aircraft cabin structure (12) an which at a second end is connectable to an air discharge opening (44) so as to discharge air from the inside of the cabin structure (12) to the air discharge opening (44), and an air discharge valve (48) disposed in the air discharge line (42).

Abstract: The present invention relates to a method for testing power lines and signal lines onboard of an aircraft, wherein the power lines and signal lines normally connect a 3-phase AC motor with the power supply system of the aircraft, and wherein the 3-phase AC motor has separate input terminals onto which, during operation of the 3-phase AC motor onboard of the aircraft, predetermined voltages of predetermined phase difference are to be applied. The method according to the invention comprises the steps of connecting the power lines and signal lines with input terminals (24) of a testing equipment (1), in place of the 3-phase AC motor; applying voltages on the power lines and signal lines; conducting a voltage test, and simultaneously with the voltage test, a phase test by the testing equipment (1) in respect of whether the voltages and the phase difference of the voltages applied to the power lines and signal lines is equal to the predetermined voltages and the predetermined phase difference.