PPRuNe Forums

PPRuNe Forums (https://www.pprune.org/)
-   Tech Log (https://www.pprune.org/tech-log-15/)
-   -   A320 purpose of THS on MCDU (https://www.pprune.org/tech-log/556007-a320-purpose-ths-mcdu.html)

sonicbum 9th Feb 2015 16:33

Hi mono,

I just checked and we have this MOI too. F/CTL PITCH TRIM/MCDU/CG DISAGREE

the system detects that any of the following disagree :
- the real pitch trim value
- the pitch trim value calculated by the FAC, based on the CG
- the pitch trim value entered in the MCDU

Can you give an example of a scenario where that would be triggered ?
Thanks

P.s. This is a hot topic especially for MFF 320/330 where the system has a different logic (FCMC and envelope computations)

vilas 10th Feb 2015 03:19

This will only be applicable to FWC H2F6. The aircraft having this FWC also have a 30 seconds count down from engine failure detection for relight.

MD83FO 18th Sep 2016 12:20

The NTSB issued safety recommendation A-02-006

the item reads "acceptable alternate action" but i cant find that action.

http://www.ntsb.gov/_layouts/ntsb.re...x?Rec=A-02-006

vilas 18th Sep 2016 16:49

Airbus changed the method of setting from NU/DN to % MAC that must be the AAA.

tubby linton 18th Sep 2016 18:08

I remember an old fleet manager's notice summarising a foreign incident of miss-set trim. The advice was "anywhere in the green band and it will fly"

MD83FO 18th Sep 2016 18:21

Hi vilas, SOP still states on FMGC cockpit preparation to insert flaps and THS on takeoff perf page,
the on after start it states "Pith trim hand whell set takeoff CG", rendering the THS units previously set useless. I feel we shouldnt be given those units nor should they be set

vilas 18th Sep 2016 18:59

MD
Yes. At the moment the MCDU software requires NU/DN input. But after start you set % on the wheel which you can convert from NU/DN to %.Also in A320 it is only as a reminder doesn't give warning. Therefore some airlines after start just take it from Fuel Pred page and set it.

Capt Scribble 18th Sep 2016 19:10

If you mis set the ZfwCoG on the init page, but then set the correctly calculated trim setting, you will get the warning.


All times are GMT. The time now is 10:04.


Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.