investigating F-16 INS Alignment

[TEOMOOSE]

I adding to what was discussed here!  - Hope it will help

Normal Alignment:
The Ring Laser Gyro (RLG) Inertial Navigation Unit (INU) - "RLG INU" - requires 8 minutes for a full gyrocompass alignment, regardless of ambient temperature. If the pilot cannot wait for a full alignment, he may switch to the NAV mode after approximately 1 1/2 minutes and accept degraded navigation accuracy. To initiate a normal gyrocompass alignment, the pilot must first select both the MMC and UFC power to ON the Avionics Power Panel, and rotate the Inertial Navigation System (INS) control switch to NORM.

 

This will automatically display the INS DED page where the pilot must then enter present position latitude, longitude, and system altitude. If the pilot waits longer than 2 minutes to enter present position data, the alignment process is re-initiated and the time for alignment reset to zero.

 

The magnetic variation is automatically calculated by the system unless the pilot chooses to manually enter it using the Magnetic Variation (MAGV) page of the DED. Manual entry may be performed at any time during the mission. The MAGV page is accessed through the LIST and MISC pages. If the pilot elects to let the system automatically compute the magnetic variation, the calculated value is displayed on the MAGV page.

 

When the INU is aligned to a usable but degraded condition, a steady Alignment (ALIGN) mnemonic and a Ready (RDY) mnemonic are displayed on the HUD and DED, respectively. Both ALIGN and RDY mnemonics flash when full navigational accuracy is achieved. The pilot may rotate the INS control knob to NAV any time after the first condition is achieved, but performance will be degraded unless he waits until the mnemonics flash. When NAV is selected, the alignment process is stopped and the INS is usable for navigation. Positioning the knob to NAV before display of RDY and ALIGN causes the alignment to cease and the attitude mode, which is usable for attitude only, to be entered. If the aircraft is moved before the INS control knob is rotated to NAV, the system will automatically go into NAV on its own.

 

ALIGN AND RDY DISPLAYED STEADY FOR DEGRADED OPERATION ACCURACY STATUS CODE 62

ALIGN AND RDY FLASH WHEN FULL ACCURACY ALIGNMENT IS COMPLETE ACCURACY STATUS CODE 10 -> DED: INS 8.O/1O 

 

Stored Heading Alignment:

The Stored Heading (STOR HDG) alignment is used whenever a faster than normal alignment is needed, for example, when operating from an alert status. The alignment is performed using a previously computed true heading and should take approximately 1 1/2 minutes. The true heading is calculated by performing a normal alignment prior to shutdown from the previously power-on condition as follows:

 • Enter present position coordinates and system altitude.

 • Perform full gyrocompass alignment. (Do not go to NAV)

 • Turn INS control knob to OFF.

The computed true heading will be retained by the INU. The aircraft must not be moved after the heading is stored. When ready for flight, perform the stored heading alignment before or during start as follows: 

• Position INS control knob to STOR HDG.

• Verify INS DED page is displayed.

• Verify present position latitude, longitude, system altitude, and true heading.

• Verify flashing RDY and ALIGN mnemonics.

• Position INS control knob to NAV

 

The accuracy status codes will decrease as during a normal alignment. The RDY and ALIGN mnemonics will flash when the accuracy code reaches 30, or 3.0 times the normal system Circular Error Probability (CEP) availability. Accuracy increases up to system limits until the INS power switch is positioned to NAV.

[BIGNEWY]

Please DM me with your evidence

 

thanks

[BIGNEWY]

Thanks for the DM

[Machalot]

Thanks for the detailed description. Which parts of this are different from what DCS models right now?