C-130 problem solved

[MartG]

The article below illustrates how a tiny change in a component can have unexpected consequences

http://www.stripes.com/news/us/keesler-technicians...

[Steve_D]

Are you feeling better now G15?

Steve

[Eric Mc]

Is this just a C-130J problem or does it effect older variants?

[Ginetta G15 Girl]

We never had that problem with the C1 or C3 a/c (C130K) so I would warrant that the Pressurisation and Conditioning system is different on the C130J.

[perdu]

Eric Mc said:

Is this just a C-130J problem or does it effect older variants?

It does say in the article that it (the problem) came about after 2004 in C-130Js Eric.

I suppose when we see C-130 we, I certainly, tend to forget that a new engine and fuel system regime changes a lot about a machine's components

It changed the need for underwing tanks for a start

[rkem]

The air con packs in the J are indeed different to the K. More powerful and apparently more noxious!

We also have external tanks as well so I don't know what the last poster meant...

[Eric Mc]

Perhaps they are an option now rather than being pretty much essential on the older models?

[perdu]

rkem said:

The air con packs in the J are indeed different to the K. More powerful and apparently more noxious!

We also have external tanks as well so I don't know what the last poster meant...

That poster meant that he'd not seen pictures of Js with underwingtanks

He had understood that the Js used fuel more efficiently and were not in need of the extra drag

He is sorry if his ignorance was taken as arrogance

[Ginetta G15 Girl]

The J model has the capability to have the Ext tanks fitted but, owing to it's more efficient engines, does not routinely carry, them unlike the K.

As a K driver I wonder about the lack of 'wing bending relief' operating in this manner and am convinced this is why the J's wing shoulder joints failed so much earlier than those on the K.

[rkem]

G15, most mk4s have externals permanently now. We routinely carry extra wing relieving fuel above a certain ZFM which you must have also done on the K?

[Ginetta G15 Girl]

I didn't know that about the C4; the SOP must have changed since it entered service, so thanks for that.

IIRC on the K, basic wing bending relief was accounted for by ensuring the outboard Mains were heavier by 715 lbs than the inboards and that if carrying fuel in the Aux tanks then it would be used first.

Without reference to the Aircrew Manual I can't remember the relationship(s) between APS (Aircraft Prepared for Service weight), ZFW (Zero Fuel Weight), Fuel Load and the Vno curves (Velocity Normal operating).