is this an acceptable borescope

[N74DV]

I need a 1/4" flexible borescope to properly do the AD on our plane. The A&P used a piece of broken mirror and flashlight and says he can't really get a good idea of the level of corrosion.

So I need to get a scope. Will this one work?

http://cgi.ebay.com/ebaymotors/SLI-ProVision-PV636-36-Borescope-w-Case-Only-179-95_W0QQcmdZViewItemQQcategoryZ43989QQihZ001QQitemZ110258795893QQrdZ1QQsspagenameZWDVW

I'm not looking for a super duper quality scope, just good enough to complete the AD.

[3Dreaming]

Re: is this an acceptable borescope

It should work OK. My dad just bought one from NAPA that looks just like that. He got it last week and it was on sale. I think he said around $150. Tom

[perryv1]

Re: is this an acceptable borescope

Thats the Same one I have.Works great.
Its a little more than 150.00 more like 299.00
PV

[Guest]

Re: is this an acceptable borescope

I got this one. http://www.tooldesk.com/products/pro...l.aspx+id+2099

Sorry guys I rented a ProVision once and didn't like it because I had to squeeze the button to keep the light on.

This one the button clicks on then stays on till you press it again.

I am surprized that an A&P does not have a borescope assuming he does annuals. Here's why. Below is a snipit of Continental Service Bulletin SB03-3 "DIFFERENTIAL PRESSURE TEST AND BORESCOPE INSPECTION PROCEDURES FOR CYLINDERS" that requires the borescope and I put a link to the SB also. He may not do annuals so please don't think I am indicting him. When this SB came out our FAA office gave us a heads up that this is now a requirement.

http://www.tcmlink.com/pdf2/SB03-3.pdf

GENERAL
F.A.A. Advisory Circular (AC) 43.13-1. Chapter 8, Section 1, paragraph 8-1 states; “ Consult the
manufacturer’s manuals, service bulletins and instruction books regarding the repair and overhaul, inspection,
installation, and maintenance of aircraft engines, for that particular make, model and type of engine. This
section lists acceptable inspection and repair procedures that may be used in the absence of an engine
manufacturer’s maintenance information.” The following procedures are to be used as the standard for
performing a cylinder differential pressure test on all TCM engines. Reference 14 CFR Part 43.13.
A. CYLINDER CONDITION DISCUSSION
The cylinder differential pressure test has become a widely used method of assisting in determining the
internal condition of cylinders and cylinder components. As with any test or inspection the cylinder
differential pressure test has certain limitations that necessitate its use in conjunction with other non-invasive
inspections. TCM requires a cylinder borescope inspection be accomplished in conjunction with the
differential pressure test.



FAR 43.13 reads...

§ 43.13 Performance rules (general).
(a) Each person performing maintenance, alteration, or preventive maintenance on an aircraft, engine, propeller, or appliance shall use the methods, techniques, and practices prescribed in the current manufacturer's maintenance manual or Instructions for Continued Airworthiness prepared by its manufacturer, or other methods, techniques, and practices acceptable to the Administrator, except as noted in §43.16. He shall use the tools, equipment, and test apparatus necessary to assure completion of the work in accordance with accepted industry practices. If special equipment or test apparatus is recommended by the manufacturer involved, he must use that equipment or apparatus or its equivalent acceptable to the Administrator.

SB96-12 titlled "CONTINUED AIRWORTHINESS INSTRUCTIONS FOR TCM
CYLINDERS." has the snipit below

link is here => http://www.aircbs.gr/pdfsd/Teledyne_...ess_checks.pdf


SUBJECT: CONTINUED AIRWORTHINESS INSTRUCTIONS FOR TCM
CYLINDERS.
PURPOSE: In addition to the instructions provided in TCM Overhaul Manuals,
Maintenance Manuals and Service Bulletins, TCM has established the
following inspection criteria to assist in achieving the optimum service life
from cylinder assemblies...

and later it says

B. COMPRESSION CHECK
1. Perform a compression check in accordance with the latest instructions in the TCM Service
Bulletin concerning cylinder compression leakage check...