I can't align my IRS. I get a fault warning, how can I fix this???

Spenser

Hi,

I have got my 757 Pro copy and after a few short flights, I fly with the autopilot conected, no FMC programed, and try to fly by heading selecting  it with the heading knob. But it doesn´t work. It stays in the heading the plane was at the moment I selected the autopilot. It doesn`t respond to any change.

What am I doing wrong? Some advice?

Thanks in advance,

To expand on what Patrick said, there's two heading modes in the 757 MCP.  SEL and HOLD.  SEL is what you're looking for, it selects the heading from the above number, and is enabled by right clicking the SEL marking on the top of the heading set knob.  HOLD on the other hand instructs AP to hold the present heading, regardless of what the indication is on the MCP.

This is handy for a few reasons.

1) If you know what your next turn will be, you can press HOLD to lock the plane to the present heading, and then dial in the next heading, and when time to turn, you can then click out the SEL mode from the knob to effect the turn.  My advice would be after you've achieved the requested heading, switch back to HOLD.

2) when on approach, before intercepting the localizer, use the HOLD mode to hold your present heading to receive positive indication that APP mode has taken roll authority by extinguishing the HOLD indicator.

Hope it helps!

Roland,

That's correct.  Once a mode is set (either related to pitch or roll) it cannot be deselected unless another mode of the same type is selected.

I.E. if you set LNAV, you cannot unselect LNAV, but if you then press HOLD for heading, LNAV will unselect.  The same is true related to coming off HOLD or SEL.

So, let's say you want to fly heading 180.  Dial up 180, right click SEL.  when you get to 180 (or another heading before then that you wish to hold) click HOLD.  SEL will deselect, and HOLD will light.  Similarly, if you're holding a heading and want to change, dial up the new heading and right click SEL and HOLD light will extinguish.  If you have your FMC programmed, and you're on HOLD, pressing LNAV will resume FMC control over roll axis and extinguish the HOLD light.

This is a little foreign compared to "Flight Sim Autopilots" because they are "dumbed down" to be more simplified, whereas the CS757 implementation is accurate to the actual aircraft.

I do suggest reading the manual section about the Autopilot systems.  It is important also to understand the difference between the EADI indicators for "VNAV PTH" and "VNAV SPD".  The FMC will select one or the other during climb/descent depending on its needs.

Hope it helps!

Just to throw my 2 cents in Mike Ray who is a ret. captain with United has written a great many books for the simulator and checkride.I have them all and there is one for the 757-767 at his website www.utem.com.This books help with getting set up and flying the simulator.I know this are set for the another company sims at the airlines but also work well with the desktop also.

                                               JeffG

Austrian Airliner wrote on Feb 20^th, 2009 at 9:26pm:

Have you aligned the things at the top left of the overhead panel, once the light has gone off, turn all three of them to NAV.

after u select the heading just right click with the mouse on top of the selector bug...this will not work with left click...there are some other things that will only work with right click, can't remember which ones but things like the IRS will turn clockwise with right click only and left with left click..so if left click does not work try the right click for that button or selector..also cycle view to 2d panel for a few seconds, that seems to free up some knobs...u can go back to 3d view after that and they should work. hope that helps

There is a specific autopilot thread on this forum.  Perhaps it needs to be stickied.  As slowdive says, "SEL" is when you pull out the knob (right click).  HOLD holds the present indicated heading.

This is all covered in the manual and in the autopilot thread.