Cleaning compounds and solvents identified in Volume IV and V, Chapter 2, may react with some encapsulants or plastics used to form fire harness tubing, wire coatings, conformal coatings, gaskets, or seals. Test on a small area for softening or other adverse reactions prior to general application. Refer to Table 2-4 for further restrictions on these materials.
10-4.1. GENERAL. Where possible, the primary method of emergency cleaning (paragraph 10-4.2) shall be used. One of the alternate methods of emergency cleaning shall be used when a sufficient quantity of fresh water is not available.
10-4.2. PRIMARY CLEANING METHOD. The primary method for removing salt water and fire extinguishing agents shall be used when a sufficient quantity of fresh water is available.
a. Flush all internal and external areas with clean, fresh water. Whenever possible, units or components that have been removed should be immersed and flushed thoroughly in clean, fresh water. A 55-gallon drum may be used for this purpose. Tilt the equipment back and forth to aid in draining off excess water
WARNING
Compressed air used for drying can create airborne particles that may enter the eyes. Pressure shall not exceed 10 psi. Eye protection is required.
b. Blow off excess water with not more than 10 psi air pressure or dry nitrogen. Deflect jet of air off interior, back, and sides of enclosures to diffuse.
Compound, Aircraft Cleaning 4 MIL-PRF-85570
c. (N) (A) If any evidence of salt or fire extinguishing agents remain, a second cleaning action should be initiated, using a solution of one part Aircraft Cleaning Compound, MIL-PRF-85570 Type II (Volume IV, Chapter 2), to ten parts of distilled water. Scrub the affected areas with the solution. Flush thoroughly with fresh water and drain excess. The equipment may be immersed in fresh water to aid in removing hidden contaminants. Tilt the equipment back and forth to aid in draining excess water.
d. (AF) If any evidence of salt or fire extinguishing agents remain, a second cleaning action should be initiated, using a solution of one part Aircraft Cleaning Compound, MIL-PRF-87937 Type II or IV (Volume V, Chapter 2), to ten parts of distilled water. Scrub the affected areas with the solution. Flush thoroughly with fresh water and drain excess. The equipment may be
immersed in fresh water to aid in removing hidden contaminants. Tilt the equipment back and forth to aid in draining excess water.
e. Blow off excess water as specified in step b. 10-4.3. ALTERNATE CLEANING METHODS. 10-4.3.1. Solvent Method.
Solvent, Degreasing 7
MIL-PRF-680
a. If soil or soot remain on external equipment chassis, scrub the affected areas using Paint Brush (Volume IV or V, Chapter 3) and Degreasing Solvent, MIL-PRF-680 Type III or Cleaning Solvent (Volume IV or V, Chapter 2).
b. Collect excess solvent and dispose as hazardous waste.
c. Clean as specified in paragraph 10-4.2. steps c or d, and e.
10-4.3.2. Aircraft Cleaning Compound Method.
Compound, Aircraft Cleaning 4 MIL-PRF-85570
a. (N) (A) Dip a cloth or brush in mixture of one part Aircraft Cleaning Compound, MIL-PRF-85570 Type II (Volume IV, Chapter 2), in nine parts water. Rub over affected exterior and interior areas until contaminants become intermixed or emulsified. Wipe off thoroughly with Cleaning Cloth, CCC-C-46 Class 7(Volume IV, Chapter 2), removing both contaminant and cleaner.
b. (AF) Dip a cloth or brush in mixture of one part Aircraft Cleaning Compound, MIL-PRF-87937 Type II or IV (Volume V, Chapter 2), in nine parts water. Rub over affected exterior and interior areas until contaminants become intermixed or emulsified. Wipe off thoroughly with Cleaning Cloth, CCC-C-46 Class 7 (Volume V, Chapter 2), removing both contaminant and cleaner.
WARNING
Compressed air used for drying can create airborne particles that may enter the eyes. Pressure shall not exceed 10 psi. Eye protection is required.
c. Blow off excess solution with not more than 10 psi dry air pressure or dry nitrogen. Deflect jet of air off interior, back, and sides of enclosure to diffuse. 10-4.3.3. Water-Displacing Method. The water displacing method is to be used as a last resort and only for temporary preservation prior to thorough cleaning. Water-Displacing Corrosion Preventive Compound, Ultra-Thin Film, MIL-C-81309, or Water-Displacing Lubricant and Corrosion Preventive Compound, MIL-L-87177 Type I or II Grade B (AF only), will deposit a nonconductive film. This film must be removed for proper function of contact points and other electromechanical devices where no slipping or wiping action is involved. Tag equipment with appropriate marking and indicate application of the corrosion preventive compound. This compound is easily removed with Degreasing Solvent, MIL-PRF-680 Type III.
WARNING
Compressed air used for drying can create airborne particles that may enter the eyes. Pressure shall not exceed 10 psi. Eye protection is required.
a. Blow off excess water with not more than 10 psi dry air pressure or dry nitrogen. Deflect jet of air off interior, back, and sides of enclosures to diffuse.
Compound, Corrosion Preventative 3 Water-Displacing
MIL-C-81309
b. (N) (A) Totally immerse equipment in a 55-gallon drum of Water-Displacing Corrosion Preventive Compound, Ultra-Thin Film, MIL-C-81309 Type II (Volume IV, Chapter 2). If immersion is not possible, spray, brush, or wipe the interior and exterior of equipment with water-displacing corrosion preventive compound.
c. (AF) Totally immerse equipment in a 55-gallon drum of Water-Displacing Corrosion Preventive Compound, Ultra-Thin Film, MIL-C-81309 Type II, or Water-Displacing Lubricant and Corrosion Preventive Compound MIL-L-87177 Type I or II Grade B (Volume V, Chapter 2). If immersion is not possible, spray, brush, or wipe the interior and exterior of equipment with water-displacing corrosion preventive compound. 10-4.4. REMOVING PURPLE K POWDER (O-D-1407, POTASSIUM BICARBONATE) OR OTHER DRY CHEMICAL FIRE EXTINGUISHING AGENTS. To remove powder, proceed as follows:
a. If the surplus can be removed by vacuum cleaning, do so; otherwise, use the following rinse procedure.
b. Use a soft bristle brush and air pressure not greater than 10 psi to dislodge contaminants between close-fitting components.
c. Vacuum clean again.
Compound, Aircraft Cleaning 4 MIL-PRF-85570
d. (N) (A) Remove the residual film of dry powder adhering to the surface by wiping, brushing, or spraying with a solution of one part aircraft cleaning compound, MIL-PRF-85570 Type II (Volume IV, Chapter 2), in nine parts of water.
e. (AF) Remove the residual film of dry powder adhering to the surface by wiping, brushing, or spraying with a solution of one part of MIL-PRF-87937 Type IV or MIL-PRF-85570 Type II aircraft cleaning compound (Volume V, Chapter 2), in nine parts of water.
f. Rinse thoroughly with fresh water.
g. Dry with cloths or paper towels, or blow dry with air pressure not greater than 10 psi.
Compound, Corrosion Preventative 3 Water-Displacing
MIL-C-81309
h. (N)(A) Liberally apply water displacing CPC, MIL-C-81309 Type II (Volume IV, Chapter 2), to affected areas.
i. (AF) Apply a liberal amount of MIL-C-81309 Type II, or MIL-L-87177 Type I or II Grade B, water displacing CPC (Volume V, Chapter 2) to the affected area.
j. Enter a notation defining areas and components that have been exposed to residue from burned materials and fire extinguishing agent in the appropriate aircraft, missile, or equipment forms, with a requirement for a special inspection for corrosion prone areas or components at a specified future time to determine if any corrosion has occurred.
10-4.5. REMOVING MIL-F-24385, AQUEOUS FILM FORMING FOAM (AFFF). To remove residues of salt water solutions of AFFF fire extinguishing agent, proceed with steps a. through j. below. To remove residues of fresh water solutions of AFFF, use the same procedure but omit steps b. through d.
NOTE
The following procedure applies to AFFF and salt water mixture normally used aboard ship. AFFF and fresh water mixtures usually do not present a corrosion problem. However, cleanup of residues after a fire is required for corrosion prevention.
a. Flush all affected areas with fresh, clean water while draining. Whenever possible, units or components which have been removed should be immersed in fresh water and then flushed thoroughly with fresh, clean water. Drain away the water.
b. Mix a solution of one pint of AFFF fire extinguishing agent (MIL-F-24385) in 10 gallons of fresh water.
c. Apply solution to affected areas using one of the following methods:
(1) Use a foam generator, solvent wash gun, backpack, or other type of spray equipment.
(2) Use aircraft washing kit, sponges, or low lint cloths, or pour solution directly over affected areas if foaming generator is not available.
d. Keep affected areas wet with AFFF solution for 3 to 5 minutes.
Compound, Aircraft Cleaning 4 MIL-PRF-85570
e. (N) (A) Clean surfaces with a solution of one part aircraft cleaning compound, MIL-PRF-85570 Type II (Volume IV, Chapter 2), in nine parts of water. Scrub affected areas and rinse with clean, fresh water. Drain away excess water.
f. (AF) Clean surfaces with a solution of one part MIL-PRF-87937 Type IV, or MIL-PRF-85570 Type II, aircraft cleaning compound (Volume V, Chapter 2), in nine parts of water. Scrub affected areas and rinse with clean, fresh water. Drain away excess water.
g. Dry with cloths, paper towels, or air pressure not greater than 10 psi.
Compound, Corrosion Preventative 3 Water-Displacing
MIL-C-81309
h. (N) (A) Apply water displacing CPC, MIL-C-81309 Type III (Volume IV, Chapter 2) to all avionic components and electrical connectors. Liberally apply water displacing CPC, MIL-C-81309 Type II (Volume IV, Chapter 2), to all other areas that cannot be properly drained or recesses which are difficult to reach.
i. (AF) Apply MIL-C-81309 Type III or MIL-L-87177 Type I or II Grade B (Volume V, Chapter 2), water displacing CPC to all avionic components and electrical connectors. Apply a liberal amount of MIL-C-81309
Type II or MIL-L-87177 Type I or II Grade B water displacing CPC to all other areas that cannot be properly drained or contain recesses which are difficult to reach.
j. Enter a notation defining areas and components that have been exposed to residue from burned materials and fire extinguishing agent in the appropriate aircraft, missile, or equipment forms, with a requirement for a special inspection for corrosion prone areas or components at a specified future time to determine if any corrosion has occurred.
10-4.6. REMOVAL OF CARBON DIOXIDE (CO2), HFC-125, OR HALON FIRE EXTINGUISHING AAGENTS.
NOTE
Carbon dioxide, HFC-125, or Halon fire extinguishing agents will not leave residues. However, smoke, smudges, or other grime from a fire is corrosive and shall be removed from affected items that are to be retained for future use.
10-4.6.1. CO2, HFC-125 (pentafluoroethane), Halon 1211 (MIL-DTL-38741, bromochloro-difluoromethane) and Halon 1301 (ASTM D 5632, bromotrifluoromethane) evaporate rapidly. Therefore, no cleanup is required unless moisture or high temperature was present at the area of application. However, ventilation should always be provided to remove the vapors. If moisture or high temperature was present, use the following clean-up procedures.
a. After fire has been extinguished, purge area and surface with clean, dry air (dust free, low moisture content, compressed air).
Compound, Aircraft Cleaning 4 MIL-PRF-85570
b. (N) (A) Clean surfaces with a solution of one part aircraft cleaning compound, MIL-PRF-85570 Type II (Volume IV, Chapter 2), in nine parts of water. Scrub affected areas and rinse with clean, fresh water. Drain away excess water.
c. (AF) Clean surfaces with a solution of one part MIL-PRF-87937 Type IV or MIL-PRF-85570 Type II (Volume V, Chapter 2), aircraft cleaning compound in nine parts of water. Scrub affected areas and rinse with clean, fresh water. Drain away excess water.
d. Dry with cloths, paper towels, or air pressure not greater than 10 psi.
Compound, Corrosion Preventative 3 Water-Displacing
MIL-C-81309
e. (N) (A) Apply water displacing CPC, MIL-C-81309 Type III (Volume IV, Chapter 2), to all avionic components and electrical connectors. Liberally apply water displacing CPC, MIL-C-81309 Type II, to all other areas that cannot be properly drained or recesses which are difficult to reach.
f. (AF) Apply MIL-C-81309 Type III, or MIL-L-87177 Type I or II Grade B water displacing CPC (Volume V, Chapter 2), to all avionic components and electrical connectors. Apply a liberal amount of MIL-C-81309 Type II, or MIL-L-87177 Type I or II Grade B, water displacing CPC to all other areas that cannot be properly drained or contain recesses which are difficult to reach. g. Enter a notation defining areas and components that have been exposed to residue from burned materials and fire extinguishing agent in the appropriate aircraft, missile, or equipment forms, with a requirement for a special inspection for corrosion prone areas or components at a specified future time to determine if any corrosion has occurred.
10-4.7. REMOVAL OF PROTEIN FOAM AND SODA ACID. The residues left from the use of these materials can be very corrosive to aircraft and equipment. Remove residues as follows:
a. Thoroughly flush the affected area with fresh water. Ensure that the rinse water is completely flushed from the aircraft or equipment.
Compound, Aircraft Cleaning 4 MIL-PRF-85570
b. (N) (A) Clean surfaces with a solution of one part aircraft cleaning compound, MIL-PRF-85570 Type II (Volume IV, Chapter 2), in nine parts of water. Scrub affected areas and rinse with clean, fresh water. Drain away excess water.
c. (AF) Clean surfaces with a solution of one part of MIL-PRF-87937 Type IV, or MIL-PRF-85570 Type II (Volume V, Chapter 2), aircraft cleaning compound in nine parts of water. Scrub affected areas and rinse with clean, fresh water. Drain away excess water.
d. Dry with cloths, paper towels, or air pressure not greater than 10 psi.
Compound, Corrosion Preventative 3 Water-Displacing
MIL-C-81309
e. (N) (A) Apply water displacing CPC, MIL-C-81309 Type III (Volume IV, Chapter 2), to all avionic components and electrical connectors. Liberally apply water displacing CPC, MIL-C-81309 Type II, to all other areas that cannot be properly drained or recesses which are difficult to reach.
f. (AF) Apply MIL-C-81309 Type III or MIL-L-87177 Type I or II Grade B (Volume V, Chapter 2) water displacing CPC to all avionic components and electrical connectors. Apply a liberal amount of MIL-C-81309 Type II or MIL-L-87177 Type I or II Grade B water displacing CPC to all other areas that cannot be properly drained or contain recesses which are difficult to reach. g. Enter a notation defining areas and components that have been exposed to residue from burned materials and fire extinguishing agent in the appropriate aircraft, missile, or equipment forms, with a requirement for a special inspection for corrosion prone areas or components at a specified future time to determine if any corrosion has occurred.
10-4.8. TREATMENT AFTER EXPOSURE TO VOLCANIC ASH. The primary concern in removing volcanic ash is the extreme abrasiveness of the ash. It is not a significantly corrosive material. Aircraft which have been exposed to volcanic ash should be cleaned using the following procedures after exposure and before the next aircraft operation or flight:
a. All static ports, fuel vents, engine inlets, air conditioning inlets, or openings shall be vacuumed to remove as much ash as possible and then suitably covered to preclude additional ash entry. Special emphasis should be placed on ducting supplying cooling air to avionics equipment.
b. After covering all openings where ash may enter, the exterior of the airframe or equipment should have ash removed using vacuum, low pressure air, or by lightly dusting with clean rags. Avoid rubbing since this may damage surfaces due to the abrasiveness of the ash.
c. Clean and lubricate entire aircraft or component in accordance with Volume II (Navy and Army) or TO 1-1-691 (Air Force.)
10-5. EMERGENCY DRYING AND PRESERVA-