A300 PMC failure & Auto-land

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16th March 2009 | 13:33

#1 (permalink)

EGKK.

Thread Starter

Joined: Nov 2006

Posts: 126

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From: At home

A300 PMC failure & Auto-land

Hi all,

Can someone be kind enough to explain why the aircraft is unable to perform an auto-land with the PMCs switched off?

I've read every where i can to find the info with no luck.

MEL states that it affects the A/L capability and i know this is fact but i don't know why...

Thanks.

16th March 2009 | 14:15

#2 (permalink)

hetfield

Joined: Mar 2006

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From: Choroni, sometimes

According my MEL ENG TRIM OFF doesn't affect Land Capability.

regards

16th March 2009 | 14:46

#3 (permalink)

EGKK.

Thread Starter

Joined: Nov 2006

Posts: 126

Likes: 7

From: At home

Auto-land...

16th March 2009 | 15:26

#4 (permalink)

tubby linton

Joined: Mar 2007

Posts: 2,766

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From: Here and there

An A300 I recently flew with this fault had been downgraded to CAT2 in the Techlog following information from the MEL.The aircraft however showed land 3 as the auto thrust can be reset after gear retraction.
Our mel has seperate pages for autoland related items,but does not have an entry for engine trim fault only pmc fault..
Airbus mel incorrect-surely not!!!

16th March 2009 | 16:19

#5 (permalink)

hetfield

Joined: Mar 2006

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From: Choroni, sometimes

Quote:

Auto-land...

Yes, of course.

16th March 2009 | 16:32

#6 (permalink)

EGKK.

Thread Starter

Joined: Nov 2006

Posts: 126

Likes: 7

From: At home

So why the downgrade to CAT 2?

How does the PMC affect this...?

16th March 2009 | 16:59

#7 (permalink)

tubby linton

Joined: Mar 2007

Posts: 2,766

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From: Here and there

Auto thrust has to be available for a CAT3 but not CAT2.

16th March 2009 | 17:32

#8 (permalink)

hetfield

Joined: Mar 2006

Posts: 1,974

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From: Choroni, sometimes

Quote:

Auto thrust has to be available for a CAT3 but not CAT2.

Yes, but A/THR is available in SPD MODE with ENG TRIM off. (PCM fail) .

Curious, at least to say.....

16th March 2009 | 17:35

#9 (permalink)

tubby linton

Joined: Mar 2007

Posts: 2,766

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From: Here and there

It wouldn't be the first time that a contradiction has been found in an Airbus mel!

16th March 2009 | 17:40

#10 (permalink)

hetfield

Joined: Mar 2006

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From: Choroni, sometimes

Quote:

It wouldn't be the first time that a contradiction has been found in an Airbus mel!

Fully agree!!!

If I would have listet all the bugs of various AB MEL, I could write a book of that....

AND, they were/are all approved by state authority

Lol

16th March 2009 | 20:00

#11 (permalink)

EGT Redline

Joined: Aug 2007

Posts: 70

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From: UK

I suspect there is a discrepency with the MEL. There is no reason why it should affect the aircraft autoland status as all ATS modes are available with PMC inoperative. The only operational limitation is the requirement to set engine power manually on T/O, however ATS can be re-engaged after gear retraction. The engines are also susceptible to throttle stagger with ENG TRIM selected off and some minor 'tweaking' of the thrust levers may be necessary to adjust N1 to their respective targets.

tubby/EGKK - you are welcome to contact the engineering line office if you ever have a technical query, we'll be more than happy to help.....