Spares Costs
Recently we purchased carbon brushes for prop de-ice slip rings
at £48.50 each plus Vat.
Each brush weighs 4 grams.
4 grams of gold will cost you £32
4 gram of platinum will cost you £52
So each brush is worth more than its weight in gold.
We often are asked why is aircraft maintenence so expensive,
and this sort of pricing is my justification.