B737-NG HPT BLADES

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B737-NG HPT BLADES

Postby OCTAVIAN » 03 Dec 2016, 11:33

Hello,

On the Borescope Inspection of the HPT Blades, there is a sentence that says:
" Discoloration and Oxidation permitted with this condition:
- Do the inspection again after each 400 cycles."

I don't know how this looks. If anyone can help me with an explanation or picture, I would be all too grateful.
OCTAVIAN
 
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Re: B737-NG HPT BLADES

Postby sjap » 06 Dec 2016, 20:51

You mean the leading edge of the HPT rotor blades .

My opinion is that if there is no other damage found as described in this same chapter, all blades are ok except the oxidation/discoloration. Then it must be really (obvious) discoloured of oxidised, and then you must inspect it again after 400 cycles to make sure it does not become more or worse.
We never used that rule to re-inspect the HPT blades as far as i know.

I have no picture of this as an aexample, do you have one?
sjap
 
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