(Adopted: 07/06/79; Amended: 5/07/82; Amended: 01/06/84; 

Amended: 06/01/84; Amended: 01/09/87; Amended: 2/06/87; 

Amended: 04/03/87; Amended 05/05/89; Amended: 03/02/90; 

Amended: 04/06/90; Amended: 06/01/90; Amended: 11/02/90; 

Amended: 12/07/90; Amended: 08/02/91; Amended 03/06/92; 

Amended: 12/04/92; Amended: 12/10/93; Amended: 1/13/95; 

Amended: 12/13/96; Amended: 03/20/07; Amended: mm/dd/yy) 

AVAQMD Rule 1124 1124-1

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

RULE 1124 

Aerospace Assembly and 

Component Manufacturing Operations 

(A) General 

(1) Purpose 

(a) To reduce Vvolatile Oorganic Ccompounds (VOC) emissions from aerospace 

assembly and component manufacturing operations.

(2) Applicability 

(a) This rule applies to any operation associated with manufacturing and assembling 

products for Aaircraft and Sspace Vvehicles. The affected industries include 

commercial and military Aaircraft, satellite, space shuttle and rocket 

manufacturers and their subcontractors.

(b) This rule also applies to maskant applicators, Aaircraft refinishers, Aaircraft 

Ffastener Mmanufacturers, Aaircraft operators, and Aaircraft maintenance and 

service facilities. 

(B) Definitions 

For the purpose of this rule, the following definitions shall apply:

[Unless otherwise indicated, new definitions are derived from “Control of Volatile Organic 

Compound Emissions from Coating Operations at Aerospace Manufacturing and Rework 

Operations,” EPA-453/R-97-004, December 1997.]

(1) Ablative Coating – A coating that chars when exposed to open flame or extreme 

temperatures, as would occur during the failure of an engine casing or during 

aerodynamic heating. The ablative char surface serves s an insulative barrier, protecting 

adjacent components from the heat or open flame. 
1124-2 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(21) Adhesion Promoter Coating – A Coatingprimer that is used to promote wetting and 

form a chemical bond with a subsequently applied Ssealant or other elastomer. [Moved 

from primer category for consistency with the CTG definition.]

(32) Adhesive - Any substance that is used to bond one surface to another surface by 

attachment. 

(43) Adhesive Bonding Primer - A Pprimer applied in a thin film to Aaerospace 

Ccomponents for the purpose of corrosion inhibition andto increased adhesive or 

adhesive film bond strength by attachment. 

(54) Aerosol Coating Product - A pressurized coating product containing pigments or resins 

that is dispensed by means of a propellant, and is packaged in a disposable can for 

hand-held application. 

(65) Aerospace Component - The raw material, partial or completed fabricated part, 

assembly of parts, or completed unit of any Aaircraft or Sspace Vvehicle and includes 

integral equipment such as models, mock-ups, prototypes, molds, jigs, tooling, 

hardware jackets, and test coupons. 

(76) Aerospace Material – any coating, Pprimer, Aadhesive, Ssealant, maskant, lubricant, 

Sstripper or hand-wipe cleaning or clean-up solvent used during the manufacturing, 

assembly, refinishing, maintenance or service of an Aerospace Component.]

(87) Air Brush Operations – Application of Aerospace Material with equipment operating at 

air pressure between 25 psi and 116 psi and an air volume of 0.7 cfm and 1.75 

respectively.

(98) Aircraft - Any machine designed to travel through the air, without leaving the earth's 

atmosphere, whether heavier or lighter than air, including airplanes, balloons, dirigibles, 

helicopters, and missiles. 

(109) Air Pollution Control Officer (APCO) – The person appointed to the position of Air 

Pollution Control Officer of the District pursuant to the provisions of California Health 

& Safety Code §40750 and his or her designee.

(110) Antichafe Coating - A coating applied to areas of moving Aaerospace Ccomponents 

which may rub during normal operation. 

(121) Anti-Wicking Wire Coating - The outer coating of a wire which prevents fluid wicking 

into insulation of the wire. 

(132) Barrier Coating - A coating applied in a thin film to fasteners to inhibit dissimilar metal 

corrosion and to prevent galling.
AVAQMD Rule 1124 1124-3 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(14) Bearing Coating – A coating applied to an antifriction bearing, a bearing housing, or the 

area adjacent to such bearing in order to facilitate bearing function or to protect be 

material from excessive wear. A material shall not be classified as a Bearing Coating if 

it can also be classified as a dry lubricative material or a solid-film lubricant. 

(15) Bonding Maskant – A temporary coating used to protect selected areas of aerospace 

parts from strong acid or alkaline solutions during processing for bonding. 

(16) Caulking and Smoothing Compound – Semi-solid materials which are applied by Hand 

Application Methods and are used to aerodynamically smooth exterior vehicle surfaces 

or fill cavities such as bolt hole accesses. A material shall not be classified as a 

Caulking and Smoothing Compound if it can also be classified as a Sealant. 

(17) Chemical Agent-Resistant Coating (CARC) – An exterior Topcoat designed to 

withstand exposure to chemical warfare agents or the decontaminants used on these 

agents. 

(183) Chemical Milling - The removal of metal by chemical action of acids or alkalis.

(19) Chemical Milling Maskant - A coating applied directly to aluminum components to 

protect surface areas when Chemical Milling the component with a Type I or Type II 

Etchant. Type I Chemical Milling Maskants are used with a Type I Etchant and Type II 

Chemical Milling Maskants are used with a Type II Etchant. This definition does not 

include Bonding Maskants, Critical Use and Line Sealant Maskants, and Seal Coat 

Maskants. Additionally, maskants that must be used with a combination of Type I or II 

Etchants and any of the above types of maskants (I.e., Bonding, Critical Use and Line 

Sealer, and Seal Coat) are not included. Maskants that are defined as Specialty 

Coatings are not included in this definition. [Definition updated to CTG definition for 

clarity of categories.]

(20) Chemical Processing Maskant - A coating applied directly to an Aerospace Component 

to protect surface areas when anodizing, aging, bonding, plating, etching, and/or 

performing other chemical surface operations on the component.

(1421) Clear Topcoat - A Ttopcoat that contains no visible pigments and is uniformly 

transparent when applied.

(22) Coating – A material that is applied to the surface of an aerospace vehicle or component 

to form a decorative, protective, or functional solid film, or the solid film itself.

(2315) Coating Application Equipment - Equipment used for applying coating to a substrate. 

Coating Aapplication Eequipment includes coating distribution lines, coating hoses, 

pressure-pots, spray guns, and hand-application equipment, such as hand-rollers, 

brushes, daubers, spatulas, and trowels.
1124-4 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(24) Commercial Exterior Aerodynamic Structure Primer – A Primer used on aerodynamic 

components and structures that protrude from the fuselage, such as wings and attached 

components, control surfaces, horizontal stabilizers, vertical fins, wing-to-body fairings, 

antennae, and landing gear and doors, for the purpose of extended corrosion protection 

and enhanced adhesion. 

(25) Commercial Interior Adhesive – Materials used in the bonding of passenger cabin 

interior components. These components must meet the FAA fireworthiness 

requirements. 

(26) Compatible Substrate Primer – Either compatible epoxy primer or adhesive primer. 

Compatible epoxy primer is primer that is compatible with the filled elastomeric coating 

and is epoxy based. The compatible substrate primer is an epoxypolyamide primer used 

to promote adhesion of elastomeric coatings such as impact-resistant coatings. 

Adhesive primer is a coating that (1) inhibits corrosion and serves as a primer applied to 

bare metal surfaces or prior to adhesive application, or (2) is applied to surfaces that can 

be expected to contain fuel. Fuel tank coatings are excluded from this category. 

(2716) Conformal Coating - A coating applied to electrical conductors and circuit boards to 

protect them against electrical discharge damage and/or corrosion.

(28) Corrosion Prevention Compound System – A coating system that provides corrosion 

protection by displacing water and penetrating mating surfaces, forming a protective 

barrier between the metal surface and moisture. Coatings containing oils or waxes are 

excluded from this category. 

(29) Critical Use and Line Sealer Maskant – A temporary coating, not covered under other 

maskant categories, used to protect selected areas of aerospace parts from strong acid or 

alkaline solutions such as those used in anodizing, plating, Chemical Milling and 

processing of magnesium, titanium, or high-strength steel, high-precision aluminum 

Chemical Milling of deep cuts, and aluminum Chemical Milling of complex shapes. 

Materials used for repairs or to bridge gaps left by scribing operations (i.e., line sealer) 

are also included in this category. 

(30) Cryogenic Flexible Primer – A Primer designed to provide corrosion resistance, 

flexibility, and adhesion of subsequent coating systems when exposed to loads up to and 

surpassing the yield point of the substrate at cryogenic temperatures (-275°F and 

below). 

(31) Cryoprotective Coating – A coating that insulates cryogenic or subcooled surfaces to 

limit propellant boil-off, maintain structural integrity of metallic structures during 

ascent or re-entry, and prevent ice formation. 

(32) Cyanoacrylate Adhesive – A fast-setting, single component Adhesive that cures at room 

temperature. Also known as “super glue.” 
AVAQMD Rule 1124 1124-5 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(33) District – The Antelope Valley Air Quality Management District, the geographical area 

of which is described in District Rule 103. 

(3417) Dry Lubricative Materials -Coatings consisting of lauric acid, cetyl alcohol, waxes or 

other non-cross linked or resin bound materials which act as a dry lubricant or 

protective coat. 

(18) District – The Antelope Valley Air Quality Management District, the geographical area 

of which is described in District Rule 103. [Alphabetized.]

(3519) Electric- oOr Radiation-Effect Coatings - Include electrically conductive coatings and 

radiation effect coatings and coating systems the uses of which may include prevention 

of radar detection.

(3620) Electronic Wire Coating - The outer electrical insulation coating applied to tape 

insulation of a wire specifically formulated to smooth and fill edges.

(37) Electrostatic Discharge and Electromagnetic Interference (EMI) Coating – A coating 

applied to Space-Vehicles, missiles, aircraft radomes, and helicopter blades to disperse 

static energy or reduce electromagnetic interference. 

(38) Elevated-Temperature Skydrol-resistant Commercial Primer – Primer applied primarily 

to commercial Aircraft (or commercial Aircraft adapted for military use) that must 

withstand immersion in phosphate-ester (PE) hydraulic fluid (Skydrol 500b or 

equivalent) at the elevated temperature of 150°F for 1,000 hours. 

(21) Epoxy Based Fuel-Tank Coating - Acoating that contains epoxy resin that is applied to 

a fuel tank of an aircraft to protect it from corrosion and/or bacterial growth. [Definition 

deleted. This category was combined with General Fuel Tank Coating in previous 

amendment which has same VOC limit.] 

(39) Epoxy Polyamide Topcoat – Coating used where harder films are required or in some 

areas where engraving is accomplished in camouflage colors. 

(4022) Exempt Compounds - A compound identified as exempt in 40 CFR 51.100(s)(1). 

[Definition modified to be consistent with District Tert-Butyl Acetate (tBA) policy.]

(4123) Facility - Any permit unit, group of permit units, non-permitted equipment or any 

combination thereof which emits or may emit an Air Pollutant; and belongs to a single 

major industrial group in the Standard Industrial Classification manual; and is located 

on a single parcel of land or on contiguous property within the District; and which is 

owned or operated by the same person or by persons under common control.

(42) Fastener – Any of various devices, including but not limited to, pins, collars, blots, nuts, 

and rivets for holding together two (2) or more objects or parts. 
1124-6 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(4324) Fastener Manufacturer - A Ffacility that coats Aaircraft fasteners, such as pins, collars, 

bolts, nuts, and rivets, with Ssolid-Ffilm Llubricants for distribution to other facilities.

(4425) Fire-Resistant (Interior) Coating - A cabin interior coating that meets for civilian 

aircraft the Federal Aviation Administration-required Ohio State University Heat 

Release, Fire and Burn Tests; for military aircraft, Aircraft Structure Integrity Program 

in MIL-STD-1530A and MIL-A-87221 (Northrop's MS-445-3.3.2.1 and MS-445-

3.3.2.2). 

(a) For civilian Aircraft, Fire-Resistant Interior Coatings are used on passenger 

cabin interior parts that are subject to FAA fireworthiness requirements. 

(b) For military Aircraft, Fire-Resistant Interior Coatings are used on parts that are 

subject to the flammability requirements of MIL-STD-1630A and MIL-A87721. 

(c) For space applications, Fire-Resistant Interior Coatings are used on parts that are 

subject to the flammability requirements of SE-R-0006 and SSP 30233. 

(45) Flexible Primer – A Primer that meets flexibility requirements such as those needed for 

adhesive bond primed fastener heads or on surfaces expected to contain fuel. The 

flexible coating is required because it provides a compatible, flexible substrate over 

bonded sheet rubber and rubber-type coatings as well as a flexible bridge between the 

fasteners, skin, and skin-to-skin joints on outer aircraft skins. This flexible bridge 

allows more topcoat flexibility around fasteners and decreases the chance of the topcoat 

cracking around the fasteners. The result is better corrosion resistance. 

(4626) Flight-Test Coating - A coating applied to an Aaircraft prior to flight testing to protect 

the Aaircraft from corrosion and to provide required marking during flight test 

evaluation. 

(4727) Fuel-Tank Adhesive - An Aadhesive used to bond components exposed to fuel that 

must be compatible with Ffuel-Ttank Ccoatings.

(4828) Fuel-Tank Coating, General -– A coating applied to a fuel tank of an Aaircraft to protect 

it from corrosion and/or bacterial growth. 

(4929) Fuel-Tank Coating, Rapid Cure – A fuel tank coating with shortened curing times and 

decreased sensitivity to low humidity during the curing process. 

(5030) Hand Application Method - The application of Aerospace Materials by manually held, 

non-mechanically operated equipment. Such equipment includes paint brushes, hand 

rollers, caulking guns, trowels, spatulas, syringe daubers, rags, and sponges.
AVAQMD Rule 1124 1124-7 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(5131) High-Temperature Coating - A coating that must withstand temperatures of more than 

350oF. 

(5232) High-Volume, Low-Pressure (HVLP) Spray - An Aerospace Materials application 

system which is operated with air pressure of between 0.1 and 10 pounds per square 

inch gauge (psig).

(5333) Impact-Resistant Coating - A flexible coating that protects Aaerospace Ccomponents, 

such as Aaircraft landing gear, and landing gear compartments, and other surfaces 

subject to impact and abrasion from runway debris.

(54) Insulation Covering – Material that is applied to foam insulation to protect the 

insulation from mechanical or environmental damage.

(55) Intermediate Release Coating – A thin coating applied beneath Topcoats to assist in 

removing the Topcoat in depainting operations and generally to allow the use of less 

hazardous depainting methods. 

(56) Lacquer Coating – A clear or pigmented coating formulated with a nitrocellulose or 

synthetic resin to dry by evaporation without a chemical reaction. Lacquers are 

resoluble in their original solvent.

(5734) Line-Sealer Maskant - A maskant used to cover scribe lines in maskant in order to 

protect against etchant in multi-step etching processing. [See Critical Use and Line 

Sealer Maskant.]

(5835) Low-Solids Adhesive Coating, Primer oOr Sealant - An Aadhesive coating, Pprimer or 

Ssealant which has less than one pound of solids per gallon of material. Such solids are 

the non-volatiles remaining after a sample is heated at 230oF (110oC) for one hour.

(5936) Low-Solids Corrosion Resistant Primer - A corrosion resistant polyurethane compatible 

Pprimer with enhanced adhesion and rain erosion resistance which contains no more 

than 45 percent (45%) solids, by weight, as applied. 

 (37) Maskant For Chemical Milling - A coating applied directly to an aerospace component 

to protect surface areas when chemically milling the component. [Formatted for 

consistency. See Chemical Milling Maskant.] 

(38) Maskant For Chemical Processing - A coating applied directly to an aerospace 

component to protect surface areas when anodizing, aging, bonding, plating, etching, 

and/or performing other chemical surface operations on the component. [Formatted for 

consistency. See Chemical Processing Maskant.]

(6039) Metallized Epoxy Coating - A coating that contains relatively large quantities of flake 

pigmentation for appearance and/or added protection. 
1124-8 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(6140) Mold Release Coating – A coating applied to the surface of a mold to prevent the 

molded component from sticking to the mold as it is removed.

(6241) Non-Structural Adhesive - An Aadhesive that bonds non-load-carrying Aaircraft 

components in non-critical applications and is not covered in any other specialty 

Aadhesive categories.

(6342) Optical Anti-Reflection Coating - A coating with a low reflectance in the infrared and 

visible wavelength range and is used for anti-reflection on or near optical and laser 

hardware.

(64) Part Marking Coating – Coatings or inks used to make identifying markings on 

materials, components, and/or assemblies. These markings may be either permanent or 

temporary.

(6543) Phosphate Ester Resistant Ink – A coating that is used for surface identification or 

marking which inhibits phosphate ester fluid corrosion. 

(6644) Photolithographic Maskant - A coating applied by Pphotoresist Ooperation(s) directly to 

printed circuit boards, and ceramic and similar substrates to protect surface areas from 

Cchemical Mmilling or Cchemical Pprocessing. 

(6745) Photoresist Operation - A process for the application or development of photoresist 

masking solution on a substrate, including preparation, soft bake, develop, hard bake, 

and stripping, and can be generally subdivided as follows: 

(a) Negative Photoresist Operation is a process where the maskant hardens when 

exposed to light and the unhardened maskant is stripped, exposing the substrate 

surface for Cchemical Mmilling or Cchemical Pprocessing. 

(b) Positive Photoresist Operation is a process where the maskant softens when 

exposed to light and the softened maskant is stripped, exposing the substrate 

surface for Cchemical Mmilling or Cchemical Pprocessing. 

(4668) Pre-bonding Bonding Etchant – An acid or basic substance that is used to increase the 

strength of an adhesive bond by chemically altering the substrate surface morphology to 

increase the bonding surface area of aerospace wire coatings to the underlying 

insulation layer. [Modified by combining Prebonding Etchant and Wire Prebonding 

Etchant definitions.]

(6947) Pretreatment Primer Coating - A Coatingprimer which contains no more than 12 percent 

(12%) solids, by weight and at least 0.5 percent (0.5%) acid by weight, to provide 

surface etching and is applied directly to metal surfaces to provide corrosion resistance, 

adhesion, and ease of stripping. [Moved from primer category for consistency with the 

CTG definition.]
AVAQMD Rule 1124 1124-9 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(7048) Primer - A coating applied directly to an Aaerospace Ccomponent for purposes of 

corrosion prevention, protection from the environment, functional fluid resistance 

and/or adhesion of subsequent coatings, Aadhesives, or Ssealants. 

(7149) Primer Compatible wWith Rain Erosion Resistant Coating - A Pprimer to which rain 

erosion resistant Ttopcoat is applied. 

(7250) Rain Erosion-Resistant Coating - A coating that protects leading edges, flaps, 

stabilizers, and engine inlet lips against erosion caused by rain impact during flight. 

(7351) Repair Coating - A coating used to recoat portions of a product which has sustained 

mechanical damage to the coating following normal painting operations. 

(52) Repair Maskant - A maskant used to cover imperfections in the maskant coat. [Specific 

definition not used. Critical Use and Line Sealer Maskant definition includes a repair 

provision.]

(7453) Rework - The inspection, repair, and reconditioning of Aaerospace Ccomponents 

subject to this rule.

(75) Rocket Motor Bonding Adhesive – Adhesive used in rocket motor bonding 

applications. 

(76) Rocket Motor Nozzle Coating – A catalyzed epoxy coating system used in elevated 

temperature applications on rocket motor nozzles.

(7754) Rollable, Brushable or Extrudable Sealant – A single or multi-component polymeric 

material used to seal many types of joints, gaps, removable panels, and windows where 

moderate movement is expected. Such material may be applied by rolling brushing 

extruding or daubing.

(78) Rubber-based Adhesive – A quick setting contact cement that provides a strong, yet 

flexible bond between two mating surfaces that may be of dissimilar materials.

(55) Rubber Solution Fuel-Tank Coating - A fuel-tank coating which performs as a sealant 

and protects the tank from corrosion and/or bacterial growth and is formulated with a 

butadiene acrylonitrile copolymer. [Definition no longer used. See Fuel Tank CoatingGeneral or –Rapid Cure.]

(7956) Scale Inhibitor Coating - A coating that is applied to the surface of a part prior to 

thermal processing to inhibit the formation of tenacious scale.

(80) Screen Print Ink – An ink used in screen printing processes during fabrication of 

decorative laminates and decals.
1124-10 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(8157) Sealants - Viscous semisolid materials that fill voids in order to seal out water, fuel, and 

other liquids and solids, and in some cases, air movement.

(82) Seal Coat Maskant – An overcoat applied over a maskant to improve abrasion and 

chemical resistance during production operations. 

(83) Silicone Insulation Material – An insulating material applied to exterior metal surfaces 

for protection from high temperatures caused by atmospheric friction or engine exhaust. 

These materials differ from Ablative Coatings in that they are not “sacrificial.”

(8458) Solid-Film Lubricant - A very thin coating consisting of a binder system containing as 

its chief pigment material one or more of the following: molybdenum disulfide, 

graphite, polytetrafluoroethylene (PTFE), or other solids that act as a dry lubricant 

between faying surfaces. 

(8559) South Coast Air Quality Management District (SCAQMD) – The air quality district 

created pursuant to Division 26, Part 3, Chapter 5.5 of the California Health & Safety 

Code (commencing with §40400). 

(8660) Space -Vehicle - A vehicle designed to travel beyond the earth's atmosphere. 

(87) Specialized Function Coating – A coating that fulfills extremely specific engineering 

requirements that are limited in application and are characterized by low volume usage. 

This category excludes coatings covered in other Specialty Coating categories. 

(88) Specialty Coating – A coating that, even though it meets the definition of a Primer, 

Topcoat, or self-priming Topcoat, has additional performance criteria beyond those of 

Primers, Topcoats, and self-priming Topcoats for specific applications. These 

performance criteria may include, but are not limited to, temperature or fire resistance, 

substrate compatibility, antireflection, temporary protection or marking, sealing, 

adhesively joining substrates, or enhanced corrosion protection.

(8961) Stencil Coating – An ink or coating that is rolled, sprayed with an airbrush or touch-up 

gun, or brushed while using a template to add identifying letters and or numbers to 

Aerospace Components.

(9062) Stripper - A volatile liquid applied to remove cured Aerospace Material or their 

residues.

(9163) Structural Adhesive - Autoclavable - An Aadhesive used to bond load-carrying 

Aaircraft components and is cured by heat and pressure in an autoclave. 

(9264) Structural Adhesive, High Temperature – Autoclavable – An Aadhesive used to bond 

load-carrying Aaircraft components which is cured by heat and pressure in an 

autoclave, and can withstand service temperatures above 450° F (232° C). 
AVAQMD Rule 1124 1124-11 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(9365) Structural Adhesive - Non-Autoclavable - An Aadhesive cured under ambient 

conditions and is used to bond load-carrying Aaircraft components or other critical 

functions, such as nonstructural bonding in the proximity of engines. 

 (66) Temporary Marking Coating - An ink or a coating used to make identifying markings, 

and is removed prior to delivery of the aerospace component and/or assembly. 

[Definition removed. See Part Marking Coating.] 

(9467) Temporary Protective Coating - A coating applied to an Aaerospace Ccomponent to 

protect it from mechanical and environmental damage during manufacturing.

(95) Thermal Control Coating – A coating formulated with specific thermal conductive or 

radiative properties to permit temperature control of the substrate.

(9668) Topcoat - A coating applied over a Pprimer or other coating on an aerospace vehicle or 

component for purposes such as appearance, identification, camouflage, or protection. 

Topcoats that are defined as specialty coatings are not included in this definition. 

[Definition modified to CTG definition for clarification pursuant to USEPA comment, 

and so definition will also include clear coating CTG category.]

(69) Touch-Up Coating - A coating used to cover minor coating imperfections appearing 

after the main coating operation. [Definition not used. See Touch-Up Operation.]

(9770) Touch-Up Operation – The application of Aerospace Materials by brush, air brush, 

detail HVLP spray equipment outside of a permitted paint enclosure to repair minor 

surface damage and imperfections after the main coating process. [See exemption 

(G)(6) for affected area exempted.]

(9871) Transfer Efficiency - The ratio of the weight or volume of coating solids adhering to an 

object to the total weight or volume, respectively, of coating solids used in the 

application process, expressed as a percentage. 

(9972) Type I Etchant – A Cchemical Mmilling etchant that contains varying amounts of 

dissolved sulfur and does not contain amines. 

(10073) Type II Etchant – A Cchemical Mmilling etchant that is a strong sodium 

hydroxide solution containing amines. 

(10174) Unicoat - A coating which is applied directly to an Aaerospace Ccomponent for 

purposes of corrosion protection, environmental protection, and functional fluid 

resistance that is not subsequently Ttopcoated. 

(10275) United States Environmental Protection Agency (USEPA) – The United States 

Environmental Protection Agency, the Administrator of the USEPA and his or her 

authorized representative. 
1124-12 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(10376) Volatile Organic Compound (VOC) - Any volatile compound containing the 

element carbon, excluding methane, carbon monoxide, carbon dioxide, carbonic acid, 

metallic carbides or carbonates, ammonium carbonate, and Eexempt Ccompounds as 

listed in 40 CFR 51.100(s)(1). [Definition modified for consistency with District TertButyl Acetate (tBA) policy.]

(104) Wet Fastener Installation Coating – A Primer or Sealant applied by dipping, brushing, 

or daubing to fasteners that are installed before the coating is cured. 

(10577) Wing Coating - A corrosion-resistant coating that is resilient enough to 

withstand the flexing of the wings. 

(78) Wire Ink - The surface identification stripe and mark on aerospace wire or cable which 

serves as an electrical insulator in the presence of high humidity. [Definition not used. 

See subcategories of Wire Coating Category.]

(79) Wire Prebonding Etchant - A non-additive surface treatment process to provide 

bondability of aerospace wire coatings to the underlying insulation layer [See 

“Prebonding Etchant” definition.]

(C) Requirements 

(1) VOC Content of Coatings 

(a) A person shall not apply to Aaerospace Ccomponents any Aerospace Materials, 

including any VOC-containing materials added to the original Aerospace 

Materials supplied by the manufacturer, which contain VOC in excess of the 

limits specified below: 

VOC LIMIT 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

Aerospace Materials: VOC Limit 

PRIMERS -- 

General 350 

Adhesion Promoter 850 

Adhesive Bonding Primers -- 

 Commercial Aircraft 250 

 Military Aircraft 805 

Low Solids Corrosion Resistant Primer 350 

Pretreatment Primer 780 

Primer Compatible with Rain Erosion-Resistant Coating 850 

COATINGS -- 

Antichafe Coating 420 

Conformal Coating 750 
AVAQMD Rule 1124 1124-13 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

VOC LIMIT 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

Electric- or Radiation-Effect Coating 800 

Fire-Resistant Coating -- 

 Civilian 650 

 Military 800 

Flight-Test Coating -- 

 Used on Missiles or Single Use Target Craft 420 

All Other 840 

Fuel-Tank Coating -- 

 General 420 

 Rapid Cure 720 

High-Temperature Coating 850 

Impact-Resistant Coating 420 

Metallized Epoxy Coating 700 

Mold Release Coatings 780 

Optical Anti-Reflection Coating 700 

Rain Erosion-Resistant Coating 800 

Scale Inhibitor 880 

Space-Vehicle Coatings -- 

 Electrostatic Discharge Protection Coating 800 

 Other Space-Vehicle Coating 1000 

Temporary Protective Coating 250 

Topcoat 420 

 Clear Topcoat 520 

Unicoat 420 

Wing Coating 750 

Wire Coatings -- 

 Electronic Wire Coating 420 

 Anti-Wicking 420 

 Pre-Bonding Etchant 420 

 Phosphate Ester Resistant Ink 925 

ADHESIVES -- 

Fuel-Tank Adhesive 620 

Non-Structural 250 

Space Vehicle Adhesive 800 

Structural Adhesive -- 

 Autoclavable 50 

 High Temperature - Autoclavable 650 

 Non-Autoclavable 850 

SEALANTS 

 Extrudable, Rollable or Brushable 280 

 Other 600 

MASKANTS -- 

For Chemical Milling 

 For use with Type I Etchant 250 
1124-14 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

VOC LIMIT 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

 For use with Type II Etchant 160 

For Chemical Processing 250* 

Photolithographic Maskant 850 

Touch-up, Line-Sealer Maskant 750 

* Less water exempt compounds and perchloroethylene (PERC). 

LUBRICANTS -

-

Fastener Installation -

-

 Solid-Film Lubricant 8

8

0

 Dry Lubricative Material 6

7

5

Fastener Lubricative Coating -

-

 Solid-Film Lubricant 2

5

0

 Dry Lubricative Material 1

2

0

 Barrier Coating 4

2

0

Non-Fastener Lubricative Coatings -

-

 Solid-Film Lubricant 8

8

0

 Dry Lubricative Materials 6

7

5

SPECIALTY COATING VOC LIMITS 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

AEROSPACE MATERIALS [Explanatory Comments, not a part of 

rule] VOC Limit 

 

PRIMERS -- 

General [SIP category] 350 

Adhesion Promoter [ 

Moved to coating category for consistency with CTG definition] 850 

Adhesive Bonding Primers [See AVAQMD 3/20/07 Staff Report for 

discussion of this category] -- 
AVAQMD Rule 1124 1124-15 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

VOC LIMIT 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

 Commercial Aircraft 250 

 Military Aircraft 805 

Commercial Exterior Aerodynamic Structure Primer [New CTG category. 

Not a subcategory of pretreatment primer] 650 

Compatible Substrate Primer [New CTG category. Not a low solids 

corrosion resistant primer] 780 

Cryogenic Flexible Primer [New CTG category. Not a subcategory of 

pretreatment primer] 645 

Elevated Temperature Skydrol-Resistant Commercial Primer [New CTG 

category. Not a subcategory of pretreatment primer] 740 

Flexible Primer [New CTG category. Not a subcategory of pretreatment 

primer] 640 

Low Solids Corrosion Resistant Primer [Added in 3/20/07 amendment. 

CTG category] 350 

Pretreatment Primer [Moved to coating category for consistency with CTG

definition] 780 

Primer Compatible with Rain Erosion-Resistant Coating [SIP category] 850 

 

COATINGS -- 

Ablative Coating [New CTG category] 600 

Adhesion Promoter Coating [Moved from primer category for consistency 

with CTG definition] 850 

Antichafe Coating [SIP category] 420 

Bearing Coating [New CTG category, not a subcategory of Fastener 

Lubricative or non-fastener lubricative coating] 620 

Chemical Agent-Resistant Coating [New specialized CTG category, 

resistant to chemical warfare agents, not a subcategory of topcoat] 550 

Conformal Coating [SIP Category] 750 

Cryoprotective Coating [New CTG category, not specific to space 

vehicles. Prevents ice formation] 600 

Electric- or Radiation-Effect Coating [SIP category] 800 

Electrostatic Discharge and Electromagnetic Interference (EMI) Coating 

[New CTG category, not specific to space vehicles] 800 

Fire-Resistant (Interior) Coating -- 

 Civilian [SIP category] 650 

 Military [SIP category] 800 

 Space [Sub-category split out to conform to CTG definition] 800 

Flight-Test Coating -- 

 Used on Missiles or Single Use Target AircCraft [SIP category] 420 

 All Other [SIP category] 840 

Fuel-Tank Coating [See AVAQMD 3/20/07 Staff Report for discussion of -- 
1124-16 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

VOC LIMIT 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

this category] 

 General 420 

 Rapid Cure 720 

High-Temperature Coating [SIP category] 850 

Impact-Resistant Coating [SIP category] 420 

Intermediate Release Coating [New CTG category] 750 

Lacquer Coating [New CTG category. Lacquer is not always a topcoat] 830 

Metallized Epoxy Coating [SIP category] 700 

Mold Release Coatings [Added in 3/20/07 amendment. CTG category] 780 

Optical Anti-Reflection Coating [SIP category] 700 

Part Marking Coating [New CTG category. Part marking can be 

permanent or temp. Remove exemption (G)(9) and (G)(11)] 850 

Pretreatment Coating [Moved from primer category for consistency with 

CTG definition] 780 

Rain Erosion-Resistant Coating [SIP category] 800 

Rocket Motor Nozzle Coating [New CTG category. Not a subcategory as 

it is very specific to withstand heat, pressure and magnetic forces] 660 

Scale Inhibitor Coating [SIP category] 880 

Space-Vehicle Coatings, Other: does not include Electric Discharge and 

EMI Protection Coating or Fire Resistant (Interior) Coating [CTG does 

not distinguish between space and other. SIP category] 1000 

 Electrostatic Discharge and Electromagnetic Interference (EMI) 

Protection Coating [This category is not specific to space vehicles. 

Alphabetized into general table] 800 

 Fire-Resistant (Interior) Coating [This category is not specific to space 

vehicles. Alphabetized into general table] 800 

 Other Space-Vehicle Coating [See Space Vehicle Coatings, Other, 

above] 1000 

Specialized Function Coating [New CTG category] 890 

Temporary Protective Coating [SIP category] 250 

Thermal Control Coating [New CTG category] 800 

Topcoat [Definition updated to include clear coating category from CTG] -- 

 Clear [SIP category] 520 

 Epoxy Polyamide [New CTG category] 660 

 Other [Reorganized for consistency with rest of table format] 420 

Unicoat Coating [SIP category] 420 

Wet Fastener Installation Coating [New CTG category] 675 

Wing Coating [SIP category] 750 

Wire Coatings [SIP categories] 
AVAQMD Rule 1124 1124-17 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

VOC LIMIT 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

 Electronic Wire Coating 420 

 Anti-Wicking 420 

 Pre-Bonding Etchant 420 

 Phosphate Ester Resistant Ink 925 

 

ADHESIVES -- 

Commercial Interior Adhesive [New CTG category, not covered by nonstructural category] 760 

Cyanoacrylate Adhesive [New CTG category] 1020 

Fuel-Tank Adhesive [SIP category] 620 

Non-Structural Adhesive [SIP category] 250 

Rocket Motor Bonding Adhesive [New CTG category, not covered by 

space vehicle adhesive] 890 

Rubber-based Adhesive [New CTG category] 850 

Space Vehicle Adhesive [SIP category] 800 

Structural Adhesive [See AVAQMD 3/20/07 Staff Report for discussion of

this category] -- 

 Autoclavable 50 

 High Temperature - Autoclavable 650 

 Non-Autoclavable 850 

 

SEALANTS -- 

Extrudable, Rollable, or Brushable or Extrudable Sealant [Added in 

3/20/07 amendment. CTG category. Restructured to match order in 

definition]] 280 

Fastener Sealant [Inadvertently removed by SCAQMD. This limit is in SIP 

version of Rule] 675 

Other [SIP category] 600 

 

MASKANTS -- 

Bonding Maskant [New CTG category. Definition of Chemical Milling 

Maskants says it is not bonding maskant] 1230 

Critical Use and Line Sealer Maskant [Renamed Touch-up, Line-sealer 

Maskant category for consistency with CTG] 750 

For Chemical Milling Maskant [Added in 3/20/07 amendment. CTG 

category] 

 For use with Type I Etchant 250 

 For use with Type II Etchant 160 

 For Chemical Processing *Less water, exempt compounds and 

perchloroethylene (PERC) 250* 
1124-18 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

VOC LIMIT 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

Photolithographic Maskant [SIP category] 850 

Touch-up, Line-Sealer Maskant 750 

* Less water exempt compounds and perchloroethylene (PERC). 

Seal Coat Maskant [New CTG category. Definition of Chemical Milling 

Maskants says it is not bonding maskant] 1230 

 

LUBRICANTS -- 

Fastener Installation Lubricant (applied at time of aircraft/component 

assembly) [Parenthetical is for clarification. SIP categories] -- 

 Solid-Film Lubricant 880 

 Dry Lubricative Material 675 

Fastener Lubricative Coating (applied at time of fastener manufacture) 

[Parenthetical is for clarification. SIP categories] -- 

 Solid-Film Lubricant 250 

 Dry Lubricative Material 120 

 Barrier Coating 420 

Non-Fastener Lubricative Coatings (applied at time of non-fastener 

manufacture) [Parenthetical is for clarification. SIP categories] -- 

 Solid-Film Lubricant 880 

 Dry Lubricative Materials 675 

 

OTHER -- 

Caulking and Smoothing Compound [New CTG category] 850 

Corrosion Prevention Compound System [New CTG category] 710 

Insulation Covering [New CTG category] 740 

Screen Print Ink [New CTG category not covered specifically by graphic 

arts rules] 840 

Silicone Insulation Material [New CTG category for aerospace industry 

specific material] 850 

[Added “Other” category to include materials that do not conform to existing 

categories. 

New categories for consistency with CTG: Commercial Exterior Aerodynamic Structure 

Primer; Compatible Substrate Primer; Cryogenic Flexible Primer; Elevated 

Temperature Skydrol-Resistant Commercial Primer; Flexible Primer; Ablative 

Coating; Adhesion Promoter; Bearing Coating; Chemical Agent-Resistant Coating 

(CARC); Cryoprotective Coating; Electrostatic Discharge and Electromagnetic 
AVAQMD Rule 1124 1124-19 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

Interference (EMI) Coating; Fire-Resistant Coating (Space); Intermediate Release 

Coating; Lacquer; Part Marking Coating; Pretreatment Coating; Rocket Motor Nozzle 

Coating; Specialized Function Coating; Thermal Control Coating; Topcoat (Epoxy 

Polyamide); Wet Fastener Installation Coating; Commercial Interior Adhesive; 

Cyanoacrylate Adhesive; Rocket Motor Bonding Adhesive; Rubber-based Adhesive; 

Fastener Sealant; Bonding Maskant; Critical Use and Line Sealer Maskant; Seal Coat 

Maskant; Caulking and Smoothing Compound; Corrosion Prevention System 

Compound; Insulation Covering; Screen Print Ink; Silicone Insulation Material. 

Changes and clarifications derived from CTG Control of Volatile Organic Compound 

Emissions from Coating Operations at Aerospace Manufacturing and Rework 

Operations, EPA-453/R-97-004, December 1997 unless otherwise noted.]

(b) Documents shall be provided to the the APCO demonstrating that the Unicoat is 

being used in lieu of the application of a Pprimer and Ttopcoat, and the 

applicant must receive written approval for the use of the Unicoat specifying the 

conditions of application from the APCO. 

(c) For Llow-Ssolids Aadhesives, Ccoatings, Pprimers or Ssealants, the appropriate 

limits in subparagraph (Cc)(1)(a) shall be expressed in grams of VOC per liter 

of material. 

(2) Solvent Use, Clean Up, and Stripping 

(a) A person shall not use VOC-containing materials for cleaning or clean up, 

excluding coating stripping and equipment cleaning unless: 

(i) The VOC composite partial pressure is 45 mm Hg or less at a 

temperature of 20oC (68oF); or 

(ii) The material contains 200 grams or less of VOC per liter of material. 

(b) A person shall not use Sstripper on Aaerospace Ccomponents unless: 

(i) It contains less than 300 grams of VOC per liter of material; or 

(ii) The VOC composite partial pressure is 9.5 mm Hg (0.18 psia) or less at 

20oC (68oF). 

(c) A person shall not atomize any solvent into open air. 

(3) Equipment Cleaning Operations 

Cleaning of Ccoating Aapplication Eequipment shall comply with provisions of Rule 

1171 – Solvent Cleaning Operations. 

(4) Storage of VOC-Containing Materials 
1124-20 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

All VOC containing material, used or unused, including but not limited to surface 

coatings, thinners, cleanup solvents, or surface preparation materials, and all solvent 

laden cloth and paper, shall be stored in non-absorbent, non-leaking containers which 

shall be kept closed at all times except during extraction or introduction of material for 

mixing, use or storage. 

(5) Transfer Efficiency 

No person or Ffacility shall apply Aerospace Materials unless it is applied with properly 

operating equipment or controlled, according to operating procedure specified by the 

equipment manufacturer or the APCO, and by the use of one of the following methods: 

(a) Eelectrostatic application; or

(b) Fflow coater; or

(c) Rroll coater; or

(d) Ddip coater; or

(e) Hhigh-Vvolume, Llow-Ppressure (HVLP) Sspray; or

(f) Hhand Aapplication Mmethods; or 

(g) Ssuch other alternative application methods as are demonstrated to the APCO, 

using District-approved procedures, to be capable of achieving at least 

equivalent Ttransfer Eefficiency to method (C)(5)(e) and for which written

approval of the APCO has been obtained; or 

(h) Approved air pollution control equipment under paragraph (C)(6). 

(6) Control Equipment 

Owners and/or operators may comply with provisions of paragraphs (C)(1), (C)(2), and 

(C)(5) by using approved air pollution control equipment provided that the VOC 

emissions from such operations and/or materials are reduced in accordance with 

provisions of (a) and (b) below. 

(a) The control device shall reduce emissions from an emission collection system 

by at least 95 percent (95%), by weight, or by reducing the output of the air 

pollution control device to less than 50 PPM ppm calculated for carbon with no 

dilution. 

(b) The owner/operator demonstrates that the system collects at least 90 percent 

(90%), by weight, of the emissions generated by the sources of emissions. 
AVAQMD Rule 1124 1124-21 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(7) Prohibition of Solicitation of Violations 

(a) A person shall not solicit or require any other person to use, in the District, any 

Aerospace Material or combination of Aerospace Materials to be applied to any 

Aaircraft component subject to the provisions of this rule that does not meet the 

limits and requirements of this rule, or of an Alternative Emission Control Plan 

(AECP) approved pursuant to the provisions of (C)(8). 

(b) The requirements of this paragraph shall apply to all written or oral agreements 

executed or entered into after April 3, 1987.

(8) Alternative Emission Control Plans 

(a) An owner/operator may comply with the provisions of paragraph (C)(1) by 

means of an Alternative Emission Control Plan pursuant to Rule 108 – 

Alternative Emission Control Plans. 

(D) Recordkeeping and Reporting Requirements 

(1) Recordkeeping 

(a) Records shall be maintained pursuant to the requirements of Rule 109 – 

Recordkeeping for Volatile Organic Compound Emissions. 

(2) Reporting 

(a) Persons who perform qualification acceptance testing on Aerospace Materials 

with a future compliance date for use in the District shall, on January 1 and July 

1 of each year, submit a status report describing the progress toward the 

development of Aerospace Materials which satisfy future compliance dates. 

These reports shall contain, at a minimum:

(i) Manufacturer, product number, VOC content, and applicable coating 

category for each of the test candidates; 

(ii) Test expenditures for the period; 

(iii) Progress on candidates tested during this period;.

(iv) Approvals received for coatings which comply with future compliance 

dates; and.

(v) Volume of coatings used in each coating category for which there is a 

future compliance date. 

(b) Facilities testing coatings in the same coating category may submit joint status 

reports. Once compliance with future compliance dates is achieved and a status 

report is submitted documenting such, no further status reports need be 

submitted. 
1124-22 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(E) Compliance Procedures and Test Methods 

(1) Calculations 

(a) For the purpose of determining compliance with VOC content limits specified in 

section (C), grams of VOC per liter of Aerospace Material shall be determined 

by using the following formulas as applicable: 

(i) For Aerospace Mmaterials not containing reactive diluents, grams of

VOC per liter of coating, less water and less Eexempt Ccompounds shall 

be determined as follows: 

  ⁄ =

	
 − 	 − 	



 −  − 



Grams of VOC per Liter of Ws – Ww – Wes

Coating, Less Water and Less = 

Exempt Compounds Vm – Vw - Ves

Where: 

G_(VOC⁄LoC) = Grams of VOC per Liter of 

Coating, Less Water and Less 

Exempt Compounds 

Ws = Weight of volatile compounds in 

grams. 

Ww = Weight of water in grams. 

Wes = Weight of Eexempt Ccompounds in 

grams. 

Vm = Volume of material in liters. 

Vw = Volume of water in liters. 

Ves = Volume of Eexempt Ccompounds 

in liters. 

(ii) For Aerospaces Materials that contain reactive diluents, grams of VOC 

per liter of coating, less water and less Eexempt Ccompounds shall be 

determined as follows:

Grams of VOC per Liter of Ws – Ww – Wes

Coating, Less Water and Less = 

Exempt Compounds Vm – Vw - Ves

Where: 

Ws = Weight of volatile compounds evolved 

during curing and analysis, in grams. 
AVAQMD Rule 1124 1124-23 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

Ww = Weight of water evolved during curing 

and analysis, in grams. 

Wes = Weight of Eexempt Ccompounds evolved 

during curing and analysis, in grams. 

Vm = Volume of material prior to reaction, in 

liters. 

Vw = Volume of water evolved during curing 

and analysis, in liters. 

Ves = Volume of Eexempt Ccompounds evolved 

during curing and analysis, in liters. 

(b) Total grams of VOC per liter of Aerospace Material shall be determined using 

the following formula: 

Grams of VOC per Liter of Ws – Ww – Wes

Coating = 

 Vm 

Where: 

Ws = Weight of volatile compounds in grams. 

Ww = Weight of water in grams. 

Wes = Weight of Eexempt Ccompounds in grams. 

Vm = Volume of material in liters. 

(c) The VOC composite partial pressure shall be determined as follows:

 = 

	

	

× 

	

	

+

	


	


+ ∑

	

	

!

"#

!

"#

 Wi 

 x VPi

 

 n MWi

 

PPc = Σ 

 i=1 Ww We n Wi

 + + Σ

 MWw MWe i=1 MWi

Where: 

Wi = Weight of the “i”th VOC compound, in grams. 

Ww = Weight of water, in grams. 

We = Weight of Eexempt Ccompound, in grams 

MWi = Molecular weight of the “i”th VOC compound, in 
1124-24 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

grams per gram-mole. 

MWe = Molecular weight of Eexempt Ccompound in grams per 

gram-mole. 

PPc = VOC composite partial pressure at 20°C, in mm Hg. 

VPi = Vapor pressure of the “i”th VOC compound at 20°C, in 

mm Hg. 

(2) VOC Content of Aerospace Materials 

(a) To determine the physical properties of an Aerospace Material in order to 

perform the calculations in subsection (E)(1) , the following reference methods 

shall be used: 

(i) EPA Reference Method 24 (Determination of Volatile Matter Content, 

Water Content, Density Volume Solids, and Weight Solids of Surface 

Coatings, Code of Federal Regulations Title 40, Part 60, Appendix A). 

a. Analysis done according to EPA Method 24 shall utilize ASTM 

Method D-2369-95 (Standard Test Method for Volatile Content 

of Coatings), referenced in EPA Method 24. [Complete title 

added to meet the enforceability requirement of CAA

110(a)(2)(A) per EPA’s “Little Blue Book” pursuant to USEPA 

comment 4/23/13.]

b. The exempt solvent content shall be determined using SCAQMD 

Test Methods 302-91 (Distillation of Solvents from Paints, 

Coatings and Inks, February 1993) and 303-91 (Determination of 

Exempt Compounds, August 1996) (SCAQMD "Laboratory 

Methods of Analysis for Enforcement Samples" manual) or;

[Complete title added to meet the enforceability requirement of 

CAA 110(a)(2)(A) per EPA’s “Little Blue Book” pursuant to 

USEPA comment 4/23/13.]

(ii) SCAQMD Test Methods 302, 303, and 304 (SCAQMD "Laboratory 

Methods of Analysis for Enforcement Samples" manual). 

(b) The following classes of compounds listed below will be analyzed as Eexempt 

Ccompounds for compliance with subdivision (C), only at such time as 

manufacturers specify which individual compounds are used in the coating 

formulations and identify the test methods, which, prior to such analysis, have 

been approved by the USEPA and the SCAQMD, that can be used to quantify 

the amounts of each Eexempt Ccompound. 

(i) Cyclic, branched, or linear, completely fluorinated alkanes; cyclic, 

branched, or linear, completely fluorinated ethers with no unsaturations; 

cyclic, branched, or linear, completely fluorinated tertiary amines with 
AVAQMD Rule 1124 1124-25 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

no unsaturations; and sulfur-containing perfluorocarbons with no 

unsaturations and with sulfur bonds only to carbon and fluorine.

(3) Test Methods 

(a) Efficiency of the control device shall be determined according to EPA Method 

25, 25A, or SCAQMD Test Method 25.1 (Total Gaseous Non-Methane 

Emissions, February 1991) or SCAQMD Test Method 25.3 (Clean-Fueled 

Combustion Sources, March 2000). Emissions determined to exceed any limits 

established by this rule through the use of either of the above-referenced test 

methods shall constitute a violation of this rule. [Complete title added to meet 

the enforceability requirement of CAA 110(a)(2)(A) per EPA’s “Little Blue 

Book” pursuant to USEPA comment 4/23/13.]

(b) The capture efficiency of the emissions collection system shall be determined by 

the USEPA method 204A-F and the most recent version of USEPA’s 

Guidelines for Determining Capture Efficiency or any other method approved by 

the USEPA, the California Air Resources Board, and the SCAQMD. 

(c) The Ttransfer Eefficiency of alternative coating application methods shall be 

determined in accordance with the SCAQMD method "Spray Equipment 

Transfer Efficiency Test Procedure for Equipment User, May 24, 1989". 

(d) The identity and quantity of components in solvents shall be determined in 

accordance with SCAQMD test method 308-91 (Quantitation of Compounds by 

Gas Chromatography, February 1993) contained in the SCAQMD "Laboratory 

Methods of Analysis for Enforcement Samples" manual. The VOC composite 

partial pressure is calculated using the equation in paragraph (b)(63)(E)(1)(c).

[Complete title added to meet the enforceability requirement of CAA 

110(a)(2)(A) per EPA’s “Little Blue Book” pursuant to USEPA comment 

4/23/13. Cross reference corrected pursuant to USEPA comment 4/23/13.]

(e) Multiple Test Methods 

(i) When more than one test method or set of test methods are specified for 

any testing, a violation of any requirement of this rule established by any 

one of the specified test methods or set of test methods shall constitute a 

violation of the rule. 

(f) Any applicable alternative test method may be used so long as such method has 

been approved by USEPA, CARB and the APCO. 
1124-26 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(F) Administrative Requirements 

(1) Rule 442 Applicability 

(a) Any Aerospace Material or Ffacility which is exempt from all or a portion of 

this rule, shall comply with the provisions of Rule 442 – Usage of Solvents. 

[Title added pursuant to USEPA comment 4/23/13.]

(G) Exemptions 

(1) The provisions of paragraph (C)(1) of this rule shall not apply to Aerospace Materials 

with separate formulations that are used in volumes of less than 20 gallons per year 

provided that the total of all such formulations applied annually at a Ffacility is less 

than 200 gallons.

(2) The provisions of subdivision (C) of this rule shall not apply to a Ffacility which uses a 

total of less than three gallons of VOC-containing Aerospace Materials on each and 

every day of operation. 

(3) The provisions of paragraphs (C)(1) and (C)(5) of this rule shall not apply to incidental 

corrosion maintenance Rrepair Ccoating operations at military Ffacilities, provided that 

the coating use at any maintenance repair location within the Ffacility does not exceed 

1.5 gallons per day, and the total coating usage for such operations at the Ffacility does 

not exceed five (5) gallons per day. 

(4) The provisions of subparagraph (C)(2)(a) shall not apply to Sspace Vvehicle 

manufacturing. 

(5) The provisions of paragraph (C)(1) shall not apply to clear or translucent coatings 

applied on clear or transparent substrates. 

(6) The provisions of paragraph (C)(5) shall not apply to Touch-up Operations and Sstencil 

Ccoatings provided that the Touch-up Operations and Sstencil Ccoatings do not exceed 

25 sq. ft. per Aaircraft. [This exemption further defines Touch-up Operations by 

defining the affected area.

(7) The provisions of paragraph (C)(1) shall not apply to the recoating of assembled 

Aaircraft at Rrework facilities if original coating formulations are used. 

(8) The provisions of paragraph (C)(1) shall not apply to Aadhesives with separate 

formulations that are used in volumes of less than ten gallons per year. 
AVAQMD Rule 1124 1124-27 

Aerospace Assembly and 

Component Manufacturing Operations 

D2: 06/26/13 

(9) The provisions of paragraph (C)(5) shall not be applied to the application of materials 

marking coatings. [Exemption removed for consistency with CTG category of Part 

Marking Coating, pursuant to USEPA comment 4/23/13.]

(109) The provisions of subdivision (C) shall not apply to laboratories which apply Aerospace 

Materials to test specimens for purposes of research, development, quality control, and 

testing for production-related operations. 

(11) The provisions of subdivision (C) shall not apply to the application of temporary 

marking coatings. [Exemption removed for consistency with CTG category of Part 

Marking Coating.] 

(1210) The provisions of paragraph (C)(2) of this rule do not apply to the surface cleaning of 

solar cells, fluid systems, avionic equipment, and laser optics. 

(1311) The provisions of subdivision (D)(1) and (C)(5) shall not be applied to the application 

of materials that contain less than 20 g/L of VOC per liter of material.

(1412) The provisions of paragraph (C)(5) shall not apply to the use of materials dispensed 

from airbrush operations provided that the paint reservoir on the air brush is 8 oz or less 

and that the total amount of coating used for Aair Bbrush Ooperations at the Facility 

does not exceed five (5) gallons per year. 

(1513) The provisions of this rule shall not apply to Aaerosol Ccoating Pproducts. 

See SIP Table at http://www.avaqmd.ca.gov/Modules/ShowDocument.aspx?documentid=921 

[SIP: Submitted as amended 3/20/07 on _____; Submitted as amended 12/13/96 on 8/1/97 and 

approved for SCAQMD area only 8/17/98, 63 FR 43884; Approved 5/6/96, 61 FR 20136, 40 CFR 

52.220(c)(215)(I)(A)(5); Approved 1/24/85, 50 FR 3338, 40 CFR 52.220(c)(154)(vii)(A); Approved 

9/28/81, 46 FR 47451, 40 CFR 52.220(c)(58)(ii)(B)]