(b)
Mask or plug all internal passages to prevent blasting materials from entering.
NOTE: Protect all areas adjacent to or near areas to be blasted with masking tape (SECTION VII) or equivalent.
(c)
Using the appropriate process parameters (see Step (4)), blast a small area using a circular motion until the desired removal has been achieved, then proceed to a new area. Never allow the blast stream to dwell on a single area at any time; always keep the impingement area moving. Try to work in a fluid manner maintaining continuous motion.
NOTE: When blasting, the blast stream must be smooth and continuous to prevent uneven erosion of coatings or damage to the substrate.
Plastic media blast cleaning exposes substrates to corrosion or potential contamination from the environment. Areas should be plastic media blast cleaned as preparation for a subsequent coating operation.
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4. Alternate Cleaners
A. General
(1)
Alternate cleaners may be used in lieu of those specified in Method No. 202A and Method No. 202E. Previously approved alternates are listed below and do not require further testing prior to use. See item 5 below for definition of Types.
(a)
Approved alternates for Method No. 202A cleaning product, Diversey 909:
.
Ardrox 6025 (Types I, and II)
.
Ardrox 6333 (Types I, and II)
.
Armakleen M-HP-2 (Types I, and II)
.
Brulin 815GD (Types I, II, and IV)
.
Brulin 1990 (Types I, and II)
.
CeeBee A7X7 (Types I, and II)
.
Daraclean 282 (Types I, and II)
.
Ecomate FN (Types I, and II)
.
Oakite 61-B (Types I, and II)
.
Turco 5948R (Types I, and II)
.
X-IT Plus (Types I, II, and IV)
(b)
Approved alternates for Method No. 202E cleaning product, Oakite Rustripper:
.
Ardrox 1854 (Type VI)
.
CeeBee J84A (Type VI)
.
Turco 4181 (Type VI)
(2)
Any other cleaners desired for use in place of those specified in Method No. 202A and 202E shall be chosen per the methods in Section II, Part E.
(3)
Procedures for preparation and use of alternate chemicals shall be documented with revision control and shall be in accordance with cleaning material manufacturers instructions, notes, warnings, and cautions addressing the agents to ensure no harm is caused to the products, parts, equipment, or appliances (per FAA Advisory Circular 43-205). These procedures shall be available to Honeywell upon request.
(4)
Results of tests performed to verify acceptability of alternate cleaners not listed above shall be documented and available to Honeywell upon request.
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(5)
Tests specified for each Type of cleaning (see types below) in Table 202 shall be performed to determine acceptable alternate cleaners to be used in place of products specified in Method No. 202A and 202E which are not already listed above as approved alternate cleaners. Alternate cleaning products not listed above shall only be used for the Type of cleaning (in Table 202) for which they specifically meet all of the test requirements.
(a)
Type I – General cleaning prior to chemical processing or other processes not covered in Types II-IV.
(b)
Type II – Cleaning prior to fluorescent penetrant inspection or magnetic particle inspection.
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