Engine Titanium Consortium - Center for Nondestructive Evaluation ...

include air drying, oven drying, and flash drying. Initial studies will utilize lcf blocks with final
recommendations to be based on actual engine hardware. A matrix that defines the effect of drying
parameters on detectability will be generated.
Development of Best Practices Document: The final stage of the work will be generation of a best
practices document that provides guidance to the OEMs and airlines and will allow for any
necessary specification changes. An assessment will be made of the need for further work such as
a formal POD study and recommendations provided.
Objective/Approach Amendments: Objective and approach were discussed and details were
added to the approach in the February 2000 kick-off meeting.
Progress (January 1, 2002 – March 31, 2002):
The third and final testing session for this study was held at Delta February 4-7. Honeywell
completed the “baked on” contamination process which lead to oxidation/scale, soot, and
coke/varnish as specified by the team. All planned cleaning methods of the baked on
contamination was completed at the Delta Airlines engine shop and at Northwest Airlines (wet-glass
beading) both in Atlanta.
Additionally, follow-up studies identified from results of the first cleaning run which occurred in
October at Delta were made. These include additional samples with penetrating oil contamination.
Some specimens were involved in various other cleaning trials including the use of vapor
degreasing, acidic scale conditioner, acetone and permanganate.
Part two of the cleaning studies at Delta included evaluation of the cleaning methods listed below
for each of the contaminate types. In cases where unsatisfactory cleaning results were found for a
particular contaminate/cleaning method combination, as determined by photometer brightness
numbers, the sample was then cleaned by another method.
• Oxidation of nickel specimens
C3 – Alkaline De-rust Solution A
C7a – Ultrasonic w/Alkaline De-rust Solution B
B2 – Wet Glass Bead
B5 – Aluminum Oxide 500 grit
• Oxidation and scale of titanium specimens
C2a – Alkaline De-rust Solution A
C2b – Alkaline De-rust Solution B
B2 – Wet Glass Bead
B5 – Aluminum Oxide 500 grit
• Soot on titanium
C1 – Aqueous degreaser
C2a – Alkaline De-rust Solution A
Quarterly Report – January 1, 2002 –March 31, 2002
print date/time: 6/6/2002 - 8:39 AM – Page 80