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【范围】
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1.1 This SAE Aerospace Recommended Practice (ARP) covers the determination of the amount of
stock loss caused by use of chemical cleaning agents on aircraft turbine engine materials.
1.2 The evaluation is conducted on representative engine materials by determination of weight loss
during total immersion in the cleaning solution with the weight-loss measurement converted to stock
loss by calculation.
1.3 Test conditions are based upon manufacturer’s recommended operating parameters for maximum
concentration, maximum temperature, and twice the maximum immersion time.
1.4 Chemical cleaning solutions and compounds used for preinspection cleaning of aircraft turbine
engine parts shall be subject to requirements of this test practice.
1.5 The test does not give consideration to cleaning performance of the compounds except as specified
in 5.1.4.
1.6 Classification:
Examples of types of cleaning materials to be qualified under the requirements of this test procedure
are:
a. Category 1: Cold carbon and paint remover
b. Category 2: Alkaline rust remover
c. Category 3: Alkaline oxide conditioner
d. Category 4: Acidic oxide conditioner
e. Category 5: Alkaline permanganate oxide conditioner
f. Category 6: Inhibited phosphoric acid
g. Category 7: Hot carbon and paint remover
h. Category 8: Silicone rubber remover
i. Category 9: Antigalling compound remover
j. Category 10: Aqueous cleaner
k. Category 11: Alkaline degreaser
l. Category 12: Organic solvent cleaner
1.7 Safety - Hazardous Materials:
While the materials, methods, applications, and processes described or referenced in this aerospace
recommended practice may involve the use of hazardous materials, this aerospace recommended
practice does not address the hazards which may be involved in such use. It is the sole
responsibility of the user to ensure familiarity with the safe and proper use of any hazardous
materials and to take necessary precautionary measures to ensure the health and safety of all
personnel involved.
1.8 Significance:
This aerospace recommended practice establishes a test procedure for determining the metal
removal characteristics of aircraft turbine engine cleaning materials when used on a representative
list of aircraft turbine engine alloys and coatings. This test result shall be compared with the
following maximum stock loss per surface to establish acceptability for overhaul shop evaluation of
cleaning performance characteristics:
a. Bare Panels or Disks: 0.000025 in (0.635 μm)
b. Electroplated Panels: 0.000025 in (0.635 μm)
c. Plasma Coated Panels or Bars: 0.000100 in (2.5 μm)strRefField
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