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9/8/98 AC 43.13-1B SECTION 14. HANDLING AND CARE OF AIRCRAFT RECOVERED FROM WATER IMMERSION. 6-220. GENERAL. Aircraft recovered from partial or total immersion in standing water or flash floods require an in-depth inspection and cleaning of both the exterior and interior areas. Water-immersion increases the probability of corrosive attack, it removes lubricants, deterio rates aircraft materials, and destroys electrical and avionics components. a. Sea water, because of salt content, is more corrosive than fresh water. However, fresh water may also contain varying amounts of salt and, as drying occurs, the salt concen tration is increased and corrosive attack accel erated. b. Prompt action is the most important factor following recovery of an aircraft from water-immersion. Components of the aircraft which have been immersed, such as the powerplant, accessories, airframe sections, actuating mechanisms, screws, bearings, working surfaces, fuel and oil systems, wiring, radios, and radar should be disassembled, as necessary, and the contaminants completely removed. 6-221. INITIAL FRESH WATER OR DETERGENT WASH. As soon as possible after the aircraft is recovered from water- immersion, thoroughly wash all internal and external areas of the aircraft using a wa ter/detergent solution as follows: a. Mix liquid detergent (MIL-D-16791, type I) and isopropyl alcohol (TT-I-735) in ra tio of eight parts detergent, to 20 parts of alco hol. Add the detergent/alcohol mixture to 72 parts of tap water and mix thoroughly. For use, add one part of the preceding concentrate to nine parts of tap water (warm water if avail able) and mix thoroughly. b. If the above specified deter gent/alcohol materials are not available, use water-emulsion cleaning compound (MIL-C-43616). Add one part compound to nine parts water. If the MIL cleaning com pound is not available, use any available mild household detergent solution with fresh tap water. 6-222. RECIPROCATING ENGINES AND PROPELLERS. Remove the propeller from the engine and the engine from the air craft. The exterior of the engine and propeller should be washed with steam, or fresh water, preferably hot. a. Major accessories, engine parts, etc., should be removed and all surfaces flushed with fresh water, preferably hot. If facilities are available, immerse the removed parts, time permitting, in hot water or hot oil, 180 °F, for a short time. Soft water is preferred. Change the water frequently. All parts must be com pletely dried by air blast or other means. If no heat-drying facility is available, wipe the cleaned parts with suitable drying cloths. b. The constant-speed propeller mecha nism should be disassembled, as required, to permit complete decontamination. Clean parts with steam or fresh water, preferably hot. Dry the cleaned parts in an oven, but if a heat- drying facility is not available, wipe the cleaned parts with suitable drying cloths. 6-223. AIRFRAME. The salvable compo nents of the fuselage, wings, empennage, sea plane and amphibian hulls and floats, and movable surfaces should be processed as fol lows: Par 6-220 Page 6-43PDF Image | AFS-640
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