New ACS - Cessna Wing Spar

[WebMaster]

Originally Posted by stackj

Larry,

I went to the link... couldn't find your reference. Where have I gone wrong?

Here's a quote from the first document

FAA Description of Airworthiness Concern
The Cessna Multi-Engine Service Letter ME78-2, dated February 13, 1978, and Airworthiness Directive (AD) 78-09-05 require a dye penetrant inspection of the rear spar cap. Dye penetrant is no longer considered acceptable for the following reasons:

There is also reference to an inspection method outlined in a SID, but since we haven't seen those, I don't know how we can comply.

That's just my .02 for starters.

[Skymaster337B]

I own an Eddy Current machine that is specified in the Cessna Service Bulletin, which the AD refers to. There's a few problems not addressed either before or now. First, it is important that Cessna provide a sample that the machine can be calibrated against; there is no reference to this, nor does Cessna have a part number for the required calibration sample. Additionally, most of the bolt holes in the front spare caps are threaded, making the inspection some what subjective.