The Qualified Products List (QPL)
The aerospace industry relies upon Type 1 fluorescent penetrant systems for the detection of defects in aircraft and engine components during maintenance and overhaul operations. Liquid penetrant specifications, such as ASTM E-1417 and AMS-2647, are considered industry standards for in-process, final, and maintenance (in-service) penetrant examinations for the final acceptance of aerospace products. These widely used specifications state that only materials listed and approved to QPL-AMS-2644 shall be utilized for penetrant examination. This is an important rule in the aerospace industry because only these materials have been quality tested by an approved laboratory.
The United States Air Force Materials Command
Type 1 fluorescent penetrant systems are approved for use by The United States Air Force Materials Command (USAFMC) at the Air Force Materials Research Laboratory (AFRL) at Wright Paterson Air Force Base in Dayton, Ohio. Only materials stating “certified to AMS 2644” are approved for use, not materials or manufacturers that state “meets the requirements of AMS2644”. Approved materials are recorded on the Qualified Products List (QPL) and certified by the manufacturer in accordance with AMS-2644. Materials listed on the QPL meet the rigorous requirements of the following:
NADCAP quality programs
FAA and EASA repair stations
AS9100 and ISO 9001:2015 quality systems
OEM aerospace manufacturers: Airbus, Boeing, General Electric, Gulfstream, Honeywell, Hamilton Sundstrand, Pratt & Whitney, Parker Hannifin, Rolls-Royce.
Common Liquid Penetrant Aerospace Systems
Developer Form a – Dry powder: D-72A
Developer Form b – Water-soluble: D-76B
Developer Form c – Water-suspendable: D-78B
Developer Form d – Nonaqueous: D-70