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YYZ342

Lost for answers...

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Hey guys...I am wondering is some one could help. I have two issues with Zibo 738, e and h:

1. Random Out of Trim
- seems to happen after FMC programming is complete
- random flights
- trim goes all the way down to APL NOSE UP; it can be brought back to required position with Pitch Trim control but slides slowly back down if Pitch Trim button is released; the wheel will not move with the mouse at this point.
- the moment wheels leave the ground issue goes away; trim stays where Pitch Trim button was released

There is nothing that seems to work except Pitch Trim. I take off with pressing Pitch Trim while during take off roll trying to hold the trim somewhere in the required range. This is not how it should be 🙂

2. While programming left FMC random CTD
- happened while in flight changing ALT (step climb)
- happened on the ground, do not recall at which point

Is any one else experiencing this?

Thnx. 
Cheers

Edited by YYZ342

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3.33h
Did some more testing. Found out that for the stab out of trim issue, it is somehow connected to A/T.

FMC is set up. Pushed back. Ready to start the engines.

- A/T off (is off from the ac initial load, switch on MCP was not touched to this point)
- Engine Start: IGN R
- Engine 2: switch to Ground
- Watch trim slowly slide down to APL NOSE UP
- Bring up trim with Trim Pitch
- Turn A/T on
- Trim stays where it was left with Pitch Trim 

- Engine 2: introduce fuel
- Engine 2: good start


This is a bug unless engines should be started with A/T set to on prior to start. 

Cheers

 

Edited by YYZ342

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