N1 Computers

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Dynamic Flight Manual Engine Thrust schedules real time, real world, and right in your field of view. Safe Flight gives you target N1 settings by the book. Only faster, more accurately and continuously.

The Safe Flight N1 Computer monitors actual sensed altitude and air temperature corrected for environmental control systems and anti-ice conditions. It continuously updates and displays your exact aircraft flight manual N1 target setting. Without ambiguity. There is nothing to interpolate.

By the book

For Takeoff, Climb, Cruise and Go-Around, you need your aircraft’s flight manual N1 thrust settings.  From the manual, select the right chart, make adjustments for changes in altitude, Ram Air Temperature, environmental control systems, engine icing and set a thumb wheel below the glare shield as a reminder. Then, set the throttles accordingly.  Of course, as changes occur in Ram Air Temperature,  pressure altitude and other factors, the target N1 should be updated.  Back to the book and repeat the entire process.

Better than the book

With Safe Flight’s N1 Computer installed your N1 thrust setting (% RPM) is displayed accurately and in real time. All the time. That means you always have access to your “right now” N1 thrust setting instead of only when you refer to the manual and reach a point on an N1 chart. Keeping your eyes safely out of the cockpit, especially at the times it matters most, is another advantage of the Safe Flight N1 Computer over the book. Programmed with your aircraft’s flight manual values, the N1 Computer helps you maximize engine performance, increase operating efficiency, and avoid engine overspeed or overtemp…and their costly consequences.

Safe Flight’s N1 Computer delivers real time thrust settings to maximize engine performance and reduce cockpit workload.

Corporate pilots using the N1 Computer report reduced cockpit workload and operator fatigue. The real time data displayed also helps pilots keep “heads up”. For single pilot operations, the system takes on even greater importance.

It gets rid of the sloppiness in the climb.” as one pilot observed.  Unlike N1 charts that yield readings for a limited number of discrete altitudes, the N1 Computer displays the target thrust settings, continuously updated until the climb is completed. “It replaces a thumb wheel N1 mnemonic with the real thing.”  Those are the words of a veteran corporate jet pilot whose Citation 560 Ultra is equipped with the Safe Flight N1 Computer.  He added: “The N1 Computer ought to be standard equipment.”

Reducing cockpit workload, maximizing engine performance and minimizing the chance of overspeed or overtemp operation, provides a sound basis for flying with Safe Flight’s N1 Computer. Its compact size and reasonable price make it easy to install and an outstanding value.

Safe Flight N1 Computer Advantages

  • Reduces cockpit workload, enhances “head’s up” operation
  • Helps protect against engine overspeed, overtemp operation; can reduce the need for costly repairs
  • Eliminates the need to interpolate performance chart data
  • Small, lightweight single-component panel-mount system
  • Computes/Displays real time flight manual N1 settings for Takeoff, Climb, Go-Around and Cruise
  • Accurate, high legibility display replaces N1 thumb wheel mnemonics or notes taped to the instrument panel


The system continuously monitors Ram Air Temperature (RAT) and Pressure Altitude from the aircraft’s digital air data bus along with Anti-Ice and Environmental Control System (ECS) discretes from the applicable aircraft systems. The N1 Computer computes and displays the N1 thrust setting (% RPM) in real time for Takeoff, Climb, Cruise and Go-Around, each based on the airplane’s flight manual performance charts. The compact, lightweight (0.8 lb.), panel-mounted unit provides crew selection/display of the appropriate target N1 thrust setting.

Before Takeoff

Selecting TO/GA (Takeoff/Go-Around) Thrust Setting will display the Flight Manual target N1 thrust setting for Takeoff. RAT may be displayed by pressing the mode switch; RAT may be changed to a pilot-selected temperature by pressing and rotating the mode switch clockwise to increase the temperature, counterclockwise to decrease it. Releasing the mode switch in the TO/GA position will display the thrust based on the selected temperature. If any other mode is selected prior to takeoff, the system will display dashes indicating an invalid mode.


Once airborne, the N1 thrust setting for Climb, Cruise or Go-Around can be selected with the mode switch. When CLB (Multi-engine Normal Climb) is selected, the system will display the N1 thrust setting for Climb. Selecting CRU (Maximum Cruise Thrust Setting) will display the N1 thrust setting for Cruise, and re-selecting TO/GA will display the N1 thrust setting for Go-Around. The system will continuously compute and display the N1 thrust setting for the selected mode and given conditions.