procedure to preserve fuel controls etc for air freight

[frenchwrench]

Anyone ever look up how to preserve a control or an engine to ship by air , I see tags with 10w mil-l-6081 mineral based oil used to flush the lines or units we receive. but no instructions about returning items...

[Beefitarian]

You should probably call them. I suspect they did not use preservative for shipping, but because it was waiting in a warehouse to be shipped and they do not know how long it will sit there.

[longjon]

Components like FCU, CSU, Start control, engines after repair/OH are preserved for storage as its not known when they will go back into service. Components removed for OH or repair are going to be stripped down and re built so shipping them out normaly doesn't require preservation. Always exceptions to this of course.

[GyvAir]

Shipping an engine or fuel control unit that has been in service means that you may well be shipping “dangerous goods” as defined by IATA/DOT, whose rules will make your head spin. In short, the shipment must be properly prepared and labelled, the unit drained, capped, plugged etc. and contents declared. Making dangerous goods shipments generally requires the person signing the waybill to have approved dangerous goods shipping training.

The MIL-L-6081 oil would likely have been chosen not just for its preservation qualities, but because of its relatively high flash point/low volatility.
If there’s a risk of some fluid leaking from an FCU in a shipping box, some low odour oil is less likely to cause an incident than gasoline or kerosene.