Used as a backup if the navigation portion of the system fails. In this mode, the LTN-92 provides pitch, roll, and heading information but loses its autonomous position-tracking capability. 3. Programming and Data Entry
If the system shows a position error greater than the certified knots-per-hour rate, a recalibration or sensor check is required. 5. Summary of Technical Specifications Specification Sensor Type Ring Laser Gyro (RLG) Alignment Time ~10 Minutes Accuracy 2.0 nm/hr (standard) Interfaces ARINC 429, Analog, and RS-232
The system is powered down. It is vital to ensure the aircraft is stationary before moving out of this mode. ALIGN (Alignment) ltn-92 manual
This is the most critical phase. The system must establish a local vertical and determine true north.
The cockpit interface used to switch between Off, Align, Nav, and Attitude modes. Used as a backup if the navigation portion
Monitor the CDU for any failure codes (e.g., "WARN" or "FAIL").
Once alignment is complete (indicated by a "Ready to Nav" light), the system enters NAV mode. It now provides continuous updates on the aircraft's position, ground speed, and wind data. ATT (Attitude Only) Programming and Data Entry If the system shows
The aircraft must not move during alignment.
The crew must enter the current Latitude and Longitude via the CDU.