SJUAPCD RULE 4605 AEROSP. ASSEMB. & COMP. MANUF. OPS          
LAST REVISED 02/17/1994
                     
          RULE 4605 AEROSPACE    ASSEMBLY   AND   COMPONENT   MANUFACTURING
                    OPERATIONS (Adopted December 19, 1991; Amended December
                    17, 1992; Amended  March 31, 1993; Amended February 17,
                    1994)

          1.0  Purpose

               The purpose of this rule  is to limit the VOC emissions from
               aerospace  coatings  and  adhesives   and   to  provide  the
               administrative requirements for recording and  measuring the
               emissions.

          2.0  Applicability

               This  rule  shall  apply  to  the manufacturing, assembling,
               coating,  masking,  bonding, paint  stripping,  and  surface
               cleaning  of  aerospace   components   and  the  cleanup  of
               equipment associated with these operations.

          3.0  Definitions

               3.1  Adhesion Promoter:  a coating applied to a substrate in
                    a monomolecular thickness to promote wetting and form a
                    chemical bond with the subsequently applied material.

               3.2  Adhesive:  a substance that is used to bond one surface
                    to another.

               3.3  Adhesive Bonding Primer:  a coating  applied  in a very
                    thin  film to aerospace adhesive bond detail components
                    for corrosion inhibition and adhesion.

               3.4  Aerosol  Coating:   a  mixture of pigments, resins, and
                    liquid and gaseous solvents and propellants packaged in
                    a disposable container for hand-held application.

               3.5  Aerospace  Component:  any  raw  material,  partial  or
                    completed  fabricated   part,  assembly  of  parts,  or
                    completed unit of any aircraft, helicopter, missile, or
                    space vehicle, including mockups and prototypes.

               3.6  Antichafe  Coating:   a coating  applied  to  areas  of
                    moving aerospace components which may rub during normal
                    operation.

               3.7  Anti-wicking Wire Coating:  the outer coating of a wire
                    which prevents fluid wicking into the insulation of the
                    wire.

               3.8  Barrier Coating:  a coating  applied  in a thin film to
                    fasteners to inhibit dissimilar metal corrosion  and to
                    prevent galling.

               3.9  Brush  Coating:   manual  application of coatings using
                    brushes and rollers.
               3.10 Clear  Topcoat:   a clear or  semi-transparent  coating
                    applied over a primer  for purposes such as appearance,
                    identification, or protection.

               3.11 Coating:  a material which  is applied to a surface and
                    which forms a film in order to  beautify and/or protect
                    such surface.

               3.12 Conformal  Coating:   a coating applied  to  electrical
                    conductors and circuit  boards  to protect them against
                    electrical discharge damage and/or corrosion.

               3.13 Dip  Coating:   the  process in which  a  substrate  is
                    immersed in a solution  (or  dispersion) containing the
                    coating and then withdrawn.

               3.14 Dry  Lubricative  Coating:   a  coating  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.

               3.15 Electric-effect  Coating:   an  electrically-conductive
                    coating.

               3.16 Electrodeposition:   a dip coating  application  method
                    where the paint solids  are  given an electrical charge
                    which is then attracted to a substrate.

               3.17 Electronic   Wire   Coating:   the   outer   electrical
                    insulation coating applied to tape insulation of a wire
                    specifically formulated to smooth and fill edges.

               3.18 Electrostatic Application:   a  sufficient  charging or
                    atomized paint droplets to cause deposition principally
                    by electrostatic attraction. This application  shall be
                    operated at a minimum 60 KV power.

               3.19 Exempt  Organic  Compounds:  all organic compounds  not
                    classified as VOCs.   Refer  to Rule 1020 (Definitions)
                    for list of exempt organic compounds.

               3.20 Fastener Sealant:  a sealant applied  to  a device used
                    to join two or more parts together.

               3.21 Fire Resistant Coating - Civilian (interior):   a cabin
                    interior   coating   that   passes   Federal   Aviation
                    Administration   standards   using   the   Ohio   State
                    University Heat Release, Fire and Burn Tests.

               3.22 Flight  Test Coating:  a coating applied to an aircraft
                    prior to  flight  testing  to protect the aircraft from
                    corrosion and to provide required marking during flight
                    test evaluation.

               3.23 Flow Coating:  a coating application system where paint
                    flows over the part and the  excess coating drains back
                    into a collection system.
               
               3.24 Fuel  Tank  Adhesive:   an  adhesive   used   to   bond
                    components  continuously exposed to fuel and which must
                    be compatible with and used with fuel tank coatings.

               3.25 Fuel Tank Coating:   a  coating applied to the interior
                    of  a  fuel  tank  or areas of  an  aircraft  that  are
                    continuously  wetted   by   fuel  to  protect  it  from
                    corrosion and/or bacterial growth.

               3.26 Grams  of VOC per Liter of Coating  Applied,  Excluding
                    Water and  Exempt Compounds:  the weight of VOC content
                    per combined  volume  of VOC and coating solids and can
                    be calculated by the following equation:

                         Grams of VOC per liter of coating less water, less
                         exempt organic compounds

                         =   Ws - Ww - Wec
                             ------------- 
                             Vm - Vw - Vec

                    where,

                              Ws  = weight of volatile compounds (grams)
                              Ww  = weight of water (grams)
                              Wec = weight of exempt compounds (grams)
                              Vm  = volume of material (liters)
                              Vw  = volume of water (liters)
                              Vec = volume of exempt compounds (liters)


               3.27 Grams of VOC per Liter  of  Material: the weight of VOC
                    per volume of material and can  be  calculated  by  the
                    following equation:

                              Grams of VOC per liter of material

                              =  Ws - Ww - Wec
                                 -------------    
                                      Vm

                    where,

                              Ws  = weight of volatile compounds (grams)
                              Ww  = weight of water (grams)
                              Wec = weight of exempt compounds (grams)
                              Vm  = volume of material (liters)

               3.28 Hand Application Methods:  the application of coatings,
                    sealants,  or  adhesives,  by  nonmechanical  hand-held
                    equipment  including  but not limited to paint brushes,
                    hand rollers, caulking guns, trowels, spatulas, syringe
                    daubers, rags and sponges.

               3.29 High  Temperature  Coating:    a   coating   that  must
                    withstand temperatures of more than 350oF.

               3.30 High  Volume  Low  Pressure Application (HVLP):   spray
                    equipment which used to apply the coating by means of a
                    gun which operates at  pressures  between  0.1 and 10.0
                    psig.

               3.31 Impact  Resistant  Coating:   a  flexible coating  that
                    protects aerospace components, such as aircraft landing
                    gear, and landing gear compartments, and other surfaces
                    subject to abrasive impacts from runway debris.

               3.32 Maskant  for  Chemical  Milling:   a  coating   applied
                    directly  to  an aerospace component to protect surface
                    areas when chemical milling such component.

               3.33 Non-Structural  Adhesive:   an adhesive that bonds non-
                    load   carrying  aircraft  component   in   noncritical
                    applications.

               3.34 Optical  Anti-Reflective 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.

               3.35 Phosphate Ester Resistant  Wire Ink Coating:  a coating
                    that  is  used for surface identification  or  mark  on
                    aerospace  wire   or   cable  and  which  inhibits  the
                    corrosion caused by contact  with  phosphate ester type
                    hydraulic fluids.

               3.36 Pretreatment Coating:  a coating which contains no more
                    than 12 percent solids by weight, and at least one-half
                    (0.5)  percent  acid,  by  weight,  to provide  surface
                    etching, and is applied directly to metal  surfaces  to
                    provide  corrosion  resistance,  adhesion  and  ease of
                    stripping.

               3.37 Primer:   a  coating  applied  directly to an aerospace
                    component   for   purposes  of  corrosion   prevention,
                    protection  from  the   environment,  functional  fluid
                    resistance and adhesion of subsequent coatings.

               3.38 Radiation-Effect Coating:  a coating which helps in the
                    prevention of radar detection.

               3.39 Rain  Erosion  Resistant  Coating:    a   coating  that
                    protects leading edges, flaps, stabilizers,  and engine
                    inlet  lips  against  erosion  caused  by  rain  during
                    flight.

               3.40 Roll  Coating:   application  of  coatings from a paint
                    trough  to  a  flat  surface  by mechanical  series  of
                    rollers.

               3.41 Scale  Inhibitor:  a coating that  is  applied  to  the
                    surface  of  a  part  prior  to  thermal  processing to
                    inhibit the formation of tenacious scale.

               3.42 Sealant:  a viscous semisolid material that fills voids
                    in order to seal out water, fuel, and other liquids and
                    solids, and in some cases air movement, and  is applied
                    with a syringe, caulking gun, or spatula.

               3.43 Solid  Film  Lubricant:  a very thin coating consisting
                    of a binder system  containing  as  its  chief  pigment
                    material  one  (1) or more of the following: molybdenum
                    disulfide, graphite,  polytetrafluoroethylene (PTFE) or
                    other  solids  that  act as  a  dry  lubricant  between
                    closely-fitting surfaces.

               3.44 Space Vehicle Coating:   a  coating applied to vehicles
                    designed to travel beyond earth's atmosphere.

               3.45 Stripper:   a  volatile  liquid  applied  to  remove  a
                    maskant for chemical processing,  cured or dried paint,
                    cured  or  dried paint residue or temporary  protective
                    coating.

               3.46 Structural Adhesive  -  Autoclavable:  an adhesive used
                    to bond load-carrying aircraft  components and is cured
                    by heat and pressure in an autoclave.

               3.47 Structural  Adhesive  - Nonautoclavable:   an  adhesive
                    cured under ambient conditions  and  is  used  to  bond
                    load-carrying  aircraft  components  or  other critical
                    functions, such as nonstructural bonding near engines.

               3.48 Surface Cleaning:  any method of cleaning  outside of a
                    degreaser, including but not limited to:

                    3.48.1    Wipe cleaning.

                    3.48.2    Equipment flushing.

               3.49 Temporary Protective Coating:  a coating applied  to an
                    aerospace  component  to protect it from mechanical and
                    environmental damage during manufacturing or shipping.

               3.50 Topcoat:  a coating applied  over a primer for purposes
                    such as appearance, identification, or protection.

               3.51 Transfer Efficiency:  the ratio of the weight or volume
                    of coating solids adhering to  the part being coated to
                    the  weight or volume of coating  solids  used  in  the
                    application process, expressed as a percentage.

               3.52 Unicoat:   a  coating  that  is  applied directly to an
                    aerospace   component   for   purposes   of   corrosion
                    protection,  environmental  protection  and  functional
                    fluid resistance that is not subsequently topcoated.  A
                    unicoat  is used in lieu of the application of a primer
                    and a topcoat.

               3.53 Volatile Organic  Compounds (VOCs):  refer to Rule 1020
                    (Definitions).

               3.54 Wing Coating:  a coating  that  is  corrosion resistant
                              and  is  resilient  enough to  withstand  the
                              flexing of wings.

               3.55 Wire   Prebonding   Etchant:   a  nonadditive   surface
                    treatment process to  provide  bondability of aerospace
                    wire coatings to the underlying insulation layer.

          4.0  Exemptions

               4.1  Until January 1, 1994, the requirements  of Section 5.0
                    of  this rule shall not apply to jet engine  or  rocket
                    engine  gas  path cleaning or flushing operations using
                    trichloroethylene  which  are carried out in accordance
                    with procedures approved by  the  APCO.  Jet  engine or
                    rocket  engine  flushing  operations  using any solvent
                    other than trichloroethylene shall remain  exempt  from
                    this rule.

               4.2  The  requirements  of  Section  5.0  shall not apply to
                    aerospace    assembly   and   component   manufacturing
                    operations using  not  more  than  four  (4) gallons of
                    products  containing  VOCs  per day. Solvent-containing
                    materials  used in operations  subject  to  Rule  4662,
                    (Organic Solvent  Degreasing  Operations), shall not be
                    included in this determination.

               4.3  The  provisions  of  Section  5.0 shall  not  apply  to
                    laboratories  which  apply  coatings,   solvents,   and
                    adhesives  to  test  specimens for purpose of research,
                    development,   quality   control,   and   testing   for
                    production-related  operations.   Any  person  claiming
                    this exemption shall  provide operational records, data
                    and  calculations, as determined  by  the  APCO  to  be
                    necessary, to substantiate this claim.

               4.4  The provisions  of  Section  5.1 of this rule shall not
                    apply to:

                   4.4.1 Coatings  or aerosols with  separate  formulations
                         that are used  in  volumes  of  less  than one (1)
                         gallon  on  any day or 20 gallons in any  calendar
                         year  at  an  aerospace   assembly  and  component
                         manufacturing facility, or

                   4.4.2 Adhesives with separate formulations that are used
                         in volumes of less than one  half  (0.5) gallon on
                         any  day or ten (10) gallons in any calendar  year
                         at   an    aerospace    assembly   and   component
                         manufacturing facility.

                    Any person seeking to claim the  exemption  in  Section
                    4.4  shall  notify  the APCO in writing that substitute
                    complying coatings are not available.

               4.5  The provisions of Section  5.4  shall  not apply to the
                    application of coatings that:

                   4.5.1 Contain  less  than 20 grams of VOC per  liter  of
                         coating less water and exempt compounds, or

                   4.5.2 Are dispensed from hand-held aerosol cans.

               4.6  For existing facilities,  if  an incineration device is
                    added  or modified for the sole  purpose  of  complying
                    with the requirements of this rule, such a device shall
                    be exempt  from  the  Best Available Control Technology
                    and  the Offset requirements  of  Rule  2201  (New  and
                    Modified Stationary Source Review Rule).

          5.0  Requirements

               5.1  Aerospace  Coatings and Adhesives: After the applicable
                    effective date  indicated  in  Table 1, no person shall
                    apply to any aerospace component  any  coating, aerosol
                    or  adhesive  with a VOC content, less water  and  less
                    exempt organic  compounds, as applied, in excess of the
                    limits in Table 1.

               5.2  Evaporative Loss Minimization:

                   5.2.1 Surface Cleaning:   No  person shall use a solvent
                         for surface cleaning, clean-up,  or  jet engine or
                         rocket  engine gas path cleaning or flushing,  not
                         exempt under  Section  4.0 of this rule, excluding
                         stripping coatings or cleaning coating application
                         equipment, unless:

                         5.2.1.1   the solvent contains less than 200 grams
                                   of  VOC  per  liter   (1.67  lb/gal)  of
                                   material, as applied, or

                         5.2.1.2   the  composite  vapor  pressure  of  the
                                   solvent is less than or  equal  to 45 mm
                                   Hg (0.87 psia) at a temperature of 68oF.
                                       
                                       Table 1
          Limits (Grams of VOC Per Liter of Coating, Less Water and Exempt
                            Compound) and Effective Dates

 Product (VOC Containing      1/1/92  1/1/93  1/1/94  2/17/94  1/1/96  1/1/97
          Material)
 ----------------------------------------------------------------------------
 
 Adhesion Promoter              850

 Adhesives
     Non-Structural             250
     Structural
        Autoclavable             50
        Nonautoclavable         850

 Adhesive Bonding Primers

     350F Curing Temp          780             250     850              250
     250F or less Curing Temp. 800             250     800              250

 Antichafe Coatings             600

 Barrier Topcoat                790     420             790      420

 Clear Topcoat                  750     520

 Conformal Coating              750

 Dry Lubricative Materials
     Fastener Manufacturing     250
     Nonfastener Manufacturing  880

 Electric/Radiation Effect      800
 Coatings

 Fastener Sealants              675

 Fire Resistant Coatings
     Civilian (Interior)        650

 Flight Test Coatings Used on
     Missiles or Single-Use     420
     Target Craft
     All others                 600

 Fuel Tank Coatings             650     420             650      420

 Fuel Tank Adhesives            620
                           
 High Temperature Coating       850

 Impact Resistant Coating       600             420

 Maskants-Chemical Milling     1200             250

 Optical Anti-Reflective        700
 Coating

 Pretreatment Coatings          780

 Primers Not Resistant to       350
 Phosphate Esters

 Phosphate Ester Resistant      350
 Primers

 Rain Erosion Resistant         800             420     800
 Coating

 Scale Inhibitor                850

 Sealant                        600

 Solid Film Lubricants
     Fastener Manufacturing             250             880              250
     Fastener Installation      880
     Nonfastener Manufacturing  880

 Space Vehicle Coatings

     Electrostatic Discharge    800
     Protection
     Other Space Vehicle       1000
     Coatings
     Adhesives                  800

 Temporary Protective Coatings  250

 Topcoats                       420

 Unicoats (Self Priming         420
 Topcoats)

 Wing Coating                   750             420     750

 Wire Coatings
     Electronic                 725     420             725      420
     Anti-Wicking               825     420             825      420
     Pro-Bonding Etching        900     420             900      420
     Phosphate Ester Resistant  925
     Ink
        
          5.2.2     Coating Application Equipment Cleaning: 
                    Effective January 1, 1992, no person shall use
                    materials containing VOC for the cleaning of
                    equipment used in coating operations unless an
                    enclosed system or enclosed gun washer is used
                    according to the manufacturer's
                    recommendations and is closed when not is use.

     5.3  Coating Strippers:  Effective January 1, 1992, no person
          shall use or specify for use within the District a
          coating stripper unless it contains less than 300 grams
          of VOC per liter (2.5 lb/gal), as applied, or unless it
          has a composite vapor pressure of 9.5 mm Hg (0.18 psia)
          or less at 68oF.

     5.4  Storage of VOC Containing Materials:  Closed containers
          shall be used for disposal and storage of cloth, paper,
          or other solvent-containing materials used for surface
          preparation, coating, cleanup, or paint removal. 

     5.5  Application Equipment Requirements:  Effective January 1,
          1992, no person shall apply coatings subject to the
          provisions of this rule unless one (1) of the following
          methods is used:

          5.5.1     Electrostatic application;

          5.5.2     Electrodeposition;

          5.5.3     High volume, low pressure application;

          5.5.4     Flow coating;

          5.5.5     Roll coating;

          5.5.6     Dip coating;

          5.5.7     Brush coating.

     5.6  Add-on Control Equipment Option:  As an alternative to
          meeting the requirements of Section 5.1 or Section 5.2,
          a person may install pollution control equipment provided
          that:

          5.6.1     The control device shall reduce organic
                    emissions from an emission collection system
                    by at least 95 percent, by weight, and

          5.6.2     The control system shall capture at least 90
                    percent, by weight, of all the organic
                    emissions from the source to the control
                    device, and

          5.6.3     Authority to Construct for such equipment is
                    received from the APCO.

     5.7  Prohibition of Solicitation:  After the effective date of
          this rule, no person shall solicit, specify or require
          any other person to use in the District any coating,
          solvent, spray equipment, or control equipment that does
          not meet the limits or requirements of this rule.

6.0  Administrative Requirements

     6.1  Recordkeeping

          6.1.1     Any person subject to the requirements of this
                    rule shall have coating manufacturer's
                    specifications, either listed on the coating
                    container or on Material Safety Data Sheets
                    (MSDS), available for review and shall
                    maintain daily records which show the
                    following for each coating:

               6.1.1.1   type,

               6.1.1.2   grams of VOC per liter of coating, less
                         water and less exempt organic compounds,
                         as applied,

               6.1.1.3   mix ratio of coatings and reducers or
                         quantities or any coating components,
                         reducers or thinners used,

               6.1.1.4   volume of coating applied, and

               6.1.1.5   method of application.

          6.1.2     Any person subject to the requirements of this
                    rule shall have manufacturer's specifications,
                    either listed on the coating container or on
                    MSDS, of any stripper containing any VOC used
                    for paint removal and of any solvents subject
                    to the requirements of Section 5.2.2 of this
                    rule, available for review and shall maintain
                    daily records which include the following
                    items:

               6.1.2.1   type,

               6.1.2.2   VOC content of solvent, in grams per
                         liter, as applied,

               6.1.2.3   volume of solvent used, and

               6.1.2.4   vapor pressure of solvent used.

          6.1.3     Any person claiming the coating exemption in
                    Section 4.3 shall maintain records of each
                    exempt coating which show on a daily basis,
                    the following for each coating:

               6.1.3.1   coating type,

               6.1.3.2   volume of coating applied,

               6.1.3.3   mix ratio of coatings and reducers or
                         quantities of any coating components,
                         reducers or thinners used,

               6.1.3.4   grams of VOC per liter of coating, less
                         water and less exempt organic compounds
                         as applied, and

               6.1.3.5   method of application.

          6.1.4     Any person subject to the requirements of this
                    rule shall record any coating intended for use
                    in any of the specialty categories listed
                    below. This record shall be available for
                    review and shall include the coating
                    manufacturer name, product ID number,
                    specialty coating category, VOC limit as
                    applied, and information to support that the
                    specialty coating has been specified for the
                    intended application.

                    6.1.4.1   adhesion promoter.

                    6.1.4.2   antichafe coating.

                    6.1.4.3   electric/radiation effect.

                    6.1.4.4   fuel tank adhesive.

                    6.1.4.5   high temperature coating.

                    6.1.4.6   impact resistant coating.

                    6.1.4.7   optical anti-reflective coating.

                    6.1.4.8   rain erosion resistant wing coating.

          6.1.5     Any person using an add-on emission control
                    system as a means of complying with this rule
                    shall maintain daily records of key system
                    operating and maintenance procedures which
                    will demonstrate continuous operation and
                    compliance of the emission control device
                    during periods of emission producing
                    activities.  Key system operating parameters
                    are those necessary to ensure compliance with
                    VOC content of coating requirements such as
                    temperatures, pressures, and flowrates.

          6.1.6     Such records shall be maintained for a minimum
                    of two (2) years and shall be available for
                    inspection by the APCO. A longer period of
                    time for record retention may be specified by
                    a permit condition.

     6.2  Test Methods

          6.2.1     Coating VOC content and solvent VOC content
                    shall be determined using EPA Reference Method
                    24 or its constituent methods. The VOC content
                    of coatings or solvents containing exempt
                    organic compounds shall be determined by ARB
                    Test Method 432.

          6.2.2     The solid content of pretreatment coatings
                    shall be determined using EPA Reference Method
                    24. The acid content of pretreatment coatings
                    shall be determined using ASTM Method D1639-
                    83.

          6.2.3     The test method for determining the fire
                    resistance of an interior coating shall be
                    Federal Aviation Administration required Ohio
                    State University Heat Release, Fire and Burn
                    Tests.

          6.2.4     The composite vapor pressure of a blended
                    solvent shall be determined by quantifying the
                    amount of each organic compound in the blend
                    using gas chromatographic analysis (ASTM 2306-
                    81) and by calculating the composite vapor
                    pressure of the solvent by summing the product
                    of the vapor pressure of each pure component
                    and its molar fraction. For the purpose of
                    this calculation, the blend shall be assumed
                    to be an ideal solution where Raoult's Law
                    applies.  The vapor pressure of each pure
                    component shall be obtained from published
                    reference manuals or handbooks.

          6.2.5     The VOC emissions from enclosed systems used
                    to clean coating application equipment shall
                    be determined by the manufacturer using the
                    South Coast Air Quality Management District
                    General Test Method for Determining Solvent
                    Losses from Spray Gun Cleaning Systems.

          6.2.6     The control device efficiency of any air
                    pollution control equipment shall be
                    determined using EPA Methods 2, 2A, 2C, or 2D
                    for measuring flow rates and EPA Methods 25,
                    25A, or 25B for measuring the total gaseous
                    organic concentrations at the inlet and outlet
                    of the control device. The calculation of
                    control device efficiency shall be determined
                    only during periods of continuous coating
                    operations and shall be averaged over the
                    duration of the coating operation not to
                    exceed 24 hours.

          6.2.7     Where add-on control equipment is utilized,
                    collection efficiency shall be determined by
                    40 CFR 52.741.