Study Corrosion Detection Flash Cards

 
Pile Management Card
Corrosion Detection

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External surfaces (skins) need to be reviewed for what?
Seam and lap joints should be checked, the end of material for concentration cell corrosion and Fillaform corrosion.
What can happen around welds?
Heat can cause improper heat treatment and intergranular corrosion.
What to look for on Control cables?
Broken strands, and corrosion, do not clean with solvent they are self-lubricating and solvents will remove the lube. Check around pulleys for ware. Reverse twist to look inside.Lube with LPS-2.
What do you look for in Control Surface recesses?
These areas are hard to see during a preflight. Need to search for hinge corrosion, on spoilers and flaps. Use a protectant like LPS-3 or Wd-40.
Are piano hinges important to check?
Yes, they are high carbon and brittle, may provide disimilar metal for galvanic corrosion.
What is important about wheels and wheel wells?
It is a high stress area that is exposed to rain. May have standing water.
What about the battery area? what is used to neutralize the acid in Lead acid and Ni-cads.
Battery Compartment - acidic, need to vent overboard. Lead-acid use bicarbonate of soda, Ni-cads use Boric Acid or Vinegar.
What do you look for around the engine?
Exhaust system - heat plus combustion gases, vibration.. not a good combination.
What do you look for in the Lavs and Galleys and why?
Corrosive fluids seep into areas not cleaned well. Poor cleaning technique.
There are many areas to look for corrosion on an aircraft. What are a few?
Exhaust system
Battery Compartment
Wheels and wheel wells
Lavatories and Galleys
External surfaces
Piano Hinges - flaps
Control surface recesses
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