Alignmen of Inertial Nav System

[jackpl 0]

After I go to NAV to align the INS, the alignment proceeds thru the 10 minute alingment, and then the Time To Align message stays on the display.The system is not aligned! If I move the aircraft, the alignment process starts all over again.How do I properly align the INS, so the alignment message disappear?Help!

[scoob 18]

which system/aircraft?*CIVA-INS*feelthere/wico 737*feelthere/wilco Abus*other--

[jackpl 0]

Sorry:The Aircraft is the iFly 747-400.After I go to NAV to align the INS, the alignment proceeds thru the 10 minute alingment, and then the Time To Align message stays on the display.The system is not aligned! If I move the aircraft, the alignment process starts all over again.How do I properly align the INS, so the alignment message disappear?Help!

[ecagan 0]

For iFly, you need to wait until the time remaining to align message disappears totally from your display before you move the aircraft. If it says "Time to align = 0 min", it is still aligning. At least that has been my experience.Eric

[philbrown 9]

Have you entered the Lat/Lon of your current position?

[jackpl 0]

1. No, I have not entered in the FMC my lat/long. Do I need to do this before or after I start the alignment?2. Not having entered Lat/Long in the FMC, after the 9 minute alignment finishes - the time out goes past 0 minutes - then a three line white message " Time to Align" with 8 or 9 digits on eachline, stays on the display.Still help!

[scoob 18]

>I have not entered in the FMC my lat/long.the FMC is the link for giving the IRS the current location of the aircraft. not inputing the current lat/lon means the IRS has no idea where 'it is' and it therefore cannot align.--

[jackpl 0]

Thank You!!!!Problem solved!!!You guys are great! Appreciate your very prompt help.The iFly 747 is a wonderful plane.Have any of you successfully used the "performance improvement" file that is on AVSIM?When I installed it, it made the 747 perform bizzarely - jumping up and down at the gate.

[SAS443 1,716]

>>I have not entered in the FMC my lat/long.>>the FMC is the link for giving the IRS the current location of>the aircraft. not inputing the current lat/lon means the IRS>has no idea where 'it is' and it therefore cannot align.>>>-->>Well, not quite!In reality, you type in the LAT/LON for comparison purpose.The coordinates you enter on the CDU are subject to testings.The entered LAT/LON is immediately compared to the LAST POS coords. If either LAT or LON has a deviation of >1 degree you will have to enter the position again.When the alignment is nearly done the IRS computed LAT and CDU entered LAT goes through a sine/Cosine test and they must agree within certain limits.So the IRS will compute its position, and compare if it's close enough to the CDU entered position rgds.SAS443