Advisory

U.S. Department 

of Transportation 

Federal Aviation Circular

Administration 

Subject: SPECIFICATION FOR AIRPORT Date: October 17, 2006 AC No: AC 150/5345-42F

LIGHT BASES, TRANSFORMER HOUSINGS, 

JUNCTION BOXES, AND ACCESSORIES Initiated by: AAS-100 Change:

1. PURPOSE. This advisory circular (AC) contains the specifications for containers designed 

to serve as airport light bases, transformer housings, junction boxes, and accessories. This AC is 

not intended to be a compilation of currently available product designs. This AC provides the 

basic standard requirements for critical dimensions and performance requirements to which all 

manufacturers must demonstrate compliance. 

2. EFFECTIVE DATE. Effective October 17, 2006, only that equipment qualified in 

accordance with this specification will be listed in AC 150/5345-53, Airport Lighting Equipment 

Certification Program. 

a. Manufacturers who, prior to the effective date of this AC, were certified manufacturers of 

Class I, Type L-867 and Type L-868 bases and extensions under AC 150/5345-42C may 

maintain their certification under this new AC for the Class IA providing they 

satisfactorily complete any additional qualification testing required as part of this AC. 

b. Manufacturers who, prior to the effective date of this AC, were certified manufacturers of 

Class II, Type L-867 bases and extensions under AC 150/5345-42C may maintain their 

certification under this new AC for Class IIA providing they satisfactorily complete any 

additional qualification testing required as part of this AC. 

c. Manufacturers who, prior to the effective date of this AC, were certified manufacturers of 

metallic Class II, Type L-867 and Type L-868 bases and extensions under AC 150/5345­

42C may maintain their certification under this new AC for Class IA providing they 

satisfactorily complete any additional qualification testing required as part of this AC. 

d. Manufacturers who were certified to manufacture 10 inch (254 mm) diameter Type 

L-868 bases may maintain their 150/5345-42C certification listing for spacers and 

extensions under Class IA in this revised AC in order to service those airports with 

existing 10 inch (254 mm) diameter taxiway centerline fixtures. These items must be 

fabricated and certified to the appropriate Class as defined in this AC. Appendix figure 

A-1 provides the design dimensional details. New base installations should not have 10 

inch (254 mm) diameter L-868 bases. 

3. CANCELLATION. AC 150/5345-42E, Specification for Airport Light Bases, Transformer 

Housings, Junction Boxes, and Accessories, dated May 8, 2006, is canceled. 

4. APPLICATION. The specifications contained in this AC are recommended by the Federal 

Aviation Administration (FAA) in all applications involving development of this nature. For 
airport projects receiving Federal funds under the airport grant assistance program, the use of 

these standards is mandatory. 

5. PRINCIPAL CHANGES FROM 42E: 

a. Figure 8, increase inner diameter of extension bottom flange from 9.25 inches to 10 

inches. 

b. Figure A-1, decrease outer diameter of spacer ring from 10.5 inches to 10 inches. 

c. Rescind torque testing of L-867s by deleting paragraphs 4.1.7 and 4.2.8. 

d. Reduce required cycles for fatigue testing from 5 × 108 to 5 × 107. 

6. METRIC UNITS. To promote an orderly transition to metric units, this AC includes both 

English and metric dimensions. The metric conversions may not be exact equivalents, and until 

there is an official changeover to the metric system, the English dimensions will govern. 

7. COMMENTS OR SUGGESTIONS for improvements to this AC should be sent to: 

Manager, Airport Engineering Division 

Federal Aviation Administration 

ATTN: AAS-100 

800 Independence Avenue, S.W.

Washington, DC 20591 

8. COPIES OF THIS AC. The Office of Airport Safety and Standards is in the process of 

making ACs available to the public through the Internet. These ACs may be found through the 

FAA home page (www.faa.gov). A printed copy of this AC and other ACs can be ordered from 

the U.S. Department of Transportation, Subsequent Distribution Office, Ardmore East Business 

Center, 3341 Q 75th Avenue, Landover, MD 20785. 

DAVID L. BENNETT 

Director of Airport Safety and Standards 
October 17, 2006 AC 150/5345-42F 

TABLE OF CONTENTS 

SECTION 1. SCOPE ................................................................................................................... 1

1.1 Type. ................................................................................................................................... 1 

1.2 Class.................................................................................................................................... 1 

1.3 Size...................................................................................................................................... 2 

SECTION 2. APPLICABLE DOCUMENTS............................................................................ 3

2.1 FAA Advisory Circulars..................................................................................................... 3 

2.2 Military Standard and Specification. .................................................................................. 3 

2.2.1 Military Standard. ...................................................................................................... 3

2.2.2 Military Specification. ............................................................................................... 3 

2.3 American Society for Testing and Materials (ASTM) Specifications, Test Methods, 

Standard Practices, and Recommended Practices......................................................... 3 

2.4 American Society of Mechanical Engineers (ASME). ....................................................... 4 

2.5 American Society for Quality Control (ASQC).................................................................. 4 

2.6 Miscellaneous Documents. ................................................................................................. 4 

SECTION 3. REQUIREMENTS................................................................................................ 5

3.1 General Description and Intended Use. .............................................................................. 5 

3.1.1 Type L-867 Bases. ..................................................................................................... 5 

3.1.2 Type L-868 Bases. ..................................................................................................... 5 

3.1.3 General Accessories................................................................................................... 5 

3.2 Fabrication and Materials. .................................................................................................. 7

3.2.1 Type L-867, Class IA and Class IB Bases and Extensions........................................ 7 

3.2.2 Type L-867, Class IIA and Class IIB Bases and Extensions..................................... 9 

3.2.3 Type L-867 Accessories. ......................................................................................... 10 

3.2.4 Type L-868, Class IA and Class IB Bases and Extensions...................................... 10 

3.2.5 Type L-868 Accessories. ......................................................................................... 12 

3.2.6 Grounding Lugs. ...................................................................................................... 12 

3.2.7 Drains. ................................................................................................................... 12 

3.2.8 Protective Coating.................................................................................................... 12 

SECTION 4. QUALITY ASSURANCE PROVISIONS ........................................................ 13

4.1 Type L-867, Class IA and Class IB Certification Testing................................................ 13 

4.1.1 Type L-867, Class IA and Class IB Load Test. ....................................................... 13 

4.1.2 Type L-867, Class IA and Class IB Weld Integrity Test......................................... 14 

4.1.3 Type L-867, Class IA and Class IB Dimensional Tests. ......................................... 14 

4.1.4 Type L-867, Class IA and Class IB Protective Coating Thickness Test. ................ 14 

4.1.5 Type L-867, Class IA and Class IB Visual Inspection. ........................................... 14 

4.1.6 Type L-867, Class IB Potassium Acetate Test. ....................................................... 14 

4.2 Type L-867, Class IIA and Class IIB Certification Testing. ............................................ 14 

4.2.1 Type L-867, Class IIA and Class IIB Load Test. .................................................... 14 

4.2.2 Type L-867, Class IIA and Class IIB Weld Integrity Test. ..................................... 15 

4.2.3 Type L-867, Class IIA and Class IIB Temperature Shock Test. ............................. 15 

4.2.4 Type L-867, Class IIA and Class IIB Dimensional Tests........................................ 15 

4.2.5 Type L-867, Class IIA and Class IIB Protective Coating Thickness Test............... 15 

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AC 150/5345-42F October 17, 2006 

4.2.6 Type L-867, Class IIA and Class IIB Visual Inspection. ........................................ 15 

4.2.7 Type L-867, Class IIB Potassium Acetate Test....................................................... 15 

4.3 Type L-868, Class IA and Class IB Certification Testing................................................ 15 

4.3.1 Type L-868, Class IA and Class IB Load Test. ....................................................... 15 

4.3.2 Type L-868, Class IA and Class IB Fatigue Test. .................................................. 15 

4.3.3 Type L-868, Class IA and Class IB Impact Test. .................................................... 16 

4.3.4 Type L-868, Class IA and Class IB Flange Bolt Torque Test................................. 16 

4.3.5 Type L-868, Class IA and Class IB Weld Integrity Test......................................... 16 

4.3.6 Type L-868, Class IA and Class IB Dimensional Tests. ......................................... 16 

4.3.7 Type L-868, Class IA and Class IB Protective Coating Thickness Test. ................ 16 

4.3.8 Type L-868, Class IA and Class IB Visual Inspection. ........................................... 16 

4.3.9 Type L-868, Class IB Potassium Acetate Test. ....................................................... 16 

4.3.10 Type L-868, Class IA and Class IB Torque Test for Adjustable Height Bases and 

Extensions................................................................................................. 16 

4.4 Production Testing............................................................................................................ 17 

4.4.1 Lot Size. ................................................................................................................... 17 

4.4.2 Sample Size and Acceptance Criteria...................................................................... 17 

4.4.3 Retesting. ................................................................................................................. 17 

4.4.4 Type L-867, Class IA and Class IB. ........................................................................ 17 

4.4.5 Type L-867, Class IIA and Class IIB....................................................................... 17 

4.4.6 Type L-868, Class IA and Class IB. ........................................................................ 17 

SECTION 5. PREPARATION FOR DELIVERY.................................................................. 19

5.1 Packing.............................................................................................................................. 19 

5.2 Marking............................................................................................................................. 19 

LIST OF FIGURES 

Figure 1. Flange, Type L-867, Class IA, Class IB, Class IIA, Class IIB .................................... 21 

Figure 2. Body, Type L-867, Class IA, Class IB, Class IIA, Class IIB....................................... 22 

Figure 3. Extensions, Type L-867, Class IA, Class IB, Class IIA, Class IIB.............................. 23 

Figure 4. Accessories, Type L-867.............................................................................................. 24 

Figure 5. Flange, Type L-868, Class IA, Class IB....................................................................... 25 

Figure 6. Body, Type L-868, Class IA, Class IB......................................................................... 26 

Figure 7. Sectional Body, Type L-868, Class IA, Class IB......................................................... 27 

Figure 8. Extensions, Type L-868 Class IA, Class IB................................................................. 28 

Figure 9. Accessories, Type L-868.............................................................................................. 29 

Figure A-1. Extensions and spacers for 10-inch (254 mm) Diameter Type L-868 base, for 

Maintenance of Existing Installations Only......................................................................... A-1 

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October 17, 2006 AC 150/5345-42F 

SECTION 1. SCOPE

This specification sets forth the requirements for light bases, transformer housings, junction 

boxes, and related accessories. This specification covers several types, classes, and sizes of 

bases. 

1.1 Type. The type designation of the bases and extensions distinguishes their application as 

follows: 

Type L-867 Bases and extensions for applications subject to occasional light vehicular 

loading but no aircraft or other heavy vehicular loading. 

Type L-868 Bases and extensions for applications subject to aircraft and other heavy 

vehicular loading. 

1.2 Class. The class designation applies as follows: 

Class IA Bases and extensions that are fabricated from metal in exact conformance 

to the critical dimensions and requirements necessary for standardization 

between parts specified herein. 

Class IB Bases and extensions that are fabricated from metal in exact conformance 

to the critical dimensions and requirements necessary for standardization 

between parts specified herein and which have been subjected to corrosion 

testing and found resistant to deicing fluids containing potassium acetate. 

Class IIA Bases and extensions that are fabricated from non-metallic materials in 

exact conformance to the critical dimensions and requirements necessary 

for standardization between parts specified herein. 

Class IIB Bases and extensions that are fabricated from non-metallic materials in 

exact conformance to the critical dimensions and requirements necessary 

for standardization between parts specified herein and which have been 

subjected to corrosion testing and found resistant to deicing fluids 

containing potassium acetate. 

Note 1 Bases and extensions that meet the Class IB or Class IIB requirements are 

also considered to meet Class IA or Class IIA requirements, respectively. 

Note 2 Bases and extensions that are fabricated as either Class IA or Class IB are 

to perform the same exact function. The only difference between the two 

classes of bases and extensions is the possible difference in metal or metal 

surface treatment required to meet the Class IB level of testing. 

Note 3 Bases and extensions that are fabricated as either Class IIA or Class IIB 

are to perform the same exact function. The only difference between the 

two bases and extensions is the possible difference in material or material 

surface treatment required to meet the Class IIB level of testing. 

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AC 150/5345-42F October 17, 2006 

1.3 Size. Five base size designations are assigned. The size refers to the nominal diameter of the 

base. Sizes and applicable types are as follow: 

Size Type 

Size A - 8 inch (203 mm) Type L-868 

Size B - 12 inch (305 mm) Type L-867 and Type L-868 

Size C - 15 inch (381 mm) Type L-868 

Size D - 16 inch (406 mm) Type L-867 

Size E - 24 inch (610 mm) Type L-867 

2 
October 17, 2006 AC 150/5345-42F 

SECTION 2. APPLICABLE DOCUMENTS

The following documents are referenced or complement the information presented in this AC: 

2.1 FAA Advisory Circulars. The FAA AC listed below contains information pertinent to this 

specification. Copies of the current edition of the AC may be obtained at no charge from the 

following FAA website: 

http://www.faa.gov/ 

AC 150/5340-30 Design and Installation Details for Airport Visual Aids 

2.2 Military Standard and Specification. The following Military Standard and Specification 

(in effect on the date of application for qualification) form a part of this specification and are 

applicable to the extent specified herein. Copies of military standards and specifications may be 

obtained at no charge from: DoDSSP, Building 4, Section D, 700 Robbins Ave, Philadelphia, 

PA 19111-5098, or from the following website: 

http://dodssp.daps.mil/ 

2.2.1 Military Standard. 

MIL-STD-810 Environmental Engineering Considerations and Laboratory 

Tests 

2.2.2 Military Specification. 

MIL-PRF-26915 Primer Coating, for Steel Surfaces 

2.3 American Society for Testing and Materials (ASTM) Specifications, Test Methods, 

Standard Practices, and Recommended Practices. The following specifications, test methods, 

standard practices, and recommended practices (in effect on the date of application for 

qualification) form a part of this specification and are applicable to the extent specified herein. 

Copies of ASTM specifications, test methods, and recommended practices may be obtained from 

the American Society for Testing and Materials, or from the website: 

http://www.astm.org/ 

A 36 Standard Specification for Carbon Structural Steel 

A 123/A 123M-02 Standard Specification for Zinc (Hot-Dip Galvanized) Coatings 

on Iron and Steel Products 

A 153 Standard Specification for Zinc Coating (Hot-Dip) on Iron and 

Steel Hardware 

A 385-03 Standard Practice for Providing High-Quality Zinc Coatings 

(Hot-Dip) 

B 633 Standard Specification for Electrodeposited Coatings of Zinc 

on Iron and Steel 

C 109 Test Method for Compressive Strength of Hydraulic Cement 

Mortars 

C 617 Standard Practice for Capping Cylindrical Concrete 

Specimens 

3 
AC 150/5345-42F October 17, 2006 

C 827 Early Volume Change of Cementitious Mixtures 

D 2240 Standard Test 

Hardness 

Method for Rubber Property-Durometer 

E 23 Standard Test Methods for Notched Bar Impact Testing of 

Metallic Materials 

2.4 American Society of Mechanical Engineers (ASME). The following standard (in effect on 

the date of application for qualification) forms a part of this specification and is applicable to the 

extent specified herein. Copies of ASME standards may be obtained from the American Society 

of Mechanical Engineers, or from the website: 

http://www.asme.org/ 

B46.1 Surface Texture, Surface Roughness, Waviness and Lay 

2.5 American Society for Quality Control (ASQC). The following standard (in effect on the 

date of application for qualification) forms a part of this specification and is applicable to the 

extent specified herein. Copies of ASQC standards may be obtained from the American Society 

for Quality Control, or from the website: 

http://www.asqc.org/ 

Z1.4 Sampling Procedures and Tables for Inspection by Attributes 

2.6 Miscellaneous Documents. 

The Design, Installation and Maintenance of In-Pavement Airport Lighting by Arthur S. Schai, 

F.I.E.S. Library of Congress Catalog Card Number 86-81865. This document does not form a 

part of this specification but is listed as valuable resource material on the design and installation 

of light bases. (Reference AC 150/5340-30 for installation details and options.) 

4 
October 17, 2006 AC 150/5345-42F 

SECTION 3. REQUIREMENTS 

3.1 General Description and Intended Use. 

3.1.1 Type L-867 Bases. Type L-867 is used as a mounting base for airport lights, as a 

transformer housing and as an electrical junction box. The Type L-867 base must be designed to 

withstand occasional light vehicular loads. It is subject to direct earth burial with and without 

concrete backfill. 

3.1.2 Type L-868 Bases. Type L-868 is used as a mounting base for in-pavement airport lights, 

as housing for series circuit transformers, and as an electrical junction box. It must be designed 

to withstand aircraft and other heavy vehicular loadings. The design must allow the installation 

of any in-pavement fixture. 

The Type L-868 top flange and base must be designed to meet the dimensional requirements and 

performance requirements, as detailed in this document, in order to assure proper mating 

between base and in-pavement lighting fixture. 

3.1.3 General Accessories. Accessories are used to make corrections, and adjustments to Type 

L-867 and Type L-868 bases, and to facilitate proper performance of the lighting fixture which 

the base supports. Examples of accessories are listed below, and when used in conjunction with 

a base specified in this AC, must not reduce the performance capabilities of that base. 

3.1.3.1 Spacer Rings. Spacer rings are available in various designs depending on the application 

and are available in various thicknesses and diameters and are generally installed between the 

base flange and the light fixture or other accessory. See Figures 3 and 8 for minimum and 

maximum height. In order to preserve the base integrity and proper bolt torque, a maximum of 

three spacer rings may be stacked together. Each type of L-868 spacer ring, when interfaced to 

the fixture housing, may be provided with a protective dam that encircles the spacer ring. The 

protective dam is 1⁄8 inch shorter than the fixture housing it protects and has an inner diameter 

(ID) that is a maximum 1/4 inch greater than the outer diameter (OD) of the fixture housing. The 

OD of the protective dam must not exceed the OD of the base flange ring. The various types of 

spacer rings are noted in paragraphs 3.1.3.1.1 through 3.1.3.1.4. 

NOTE 1: The protective dam prevents grout, sealant, or other pavement material from sealing 

the fixture in place and preventing easy maintenance access to the fixture or base. 

NOTE 2: On field adjustable bases and extensions, the protective dam may be integral to the 

base or extension top flange ring as long as the requirements noted above and the base or 

extension top flange ring dimensions comply with the dimensional requirements of this AC. 

3.1.3.1.1 Flat Spacer Ring. A flat spacer ring is used to provide height adjustment for Type 

L-867 or Type L-868 bases. 

3.1.3.1.2 Grooved Spacer Ring. A grooved spacer ring, when used with a provided “O” ring 

gasket, is used to provide a seal between the in-pavement fixture and spacer ring for the purpose 

of minimizing the entrance of surface water and other liquids into the Type L-868 base. 

3.1.3.1.3 Tapered Spacer Ring. Tapered spacer rings are used to provide level and/or height 

correction for out-of-level Type L-868 and L-867 bases. 

3.1.3.1.4 Azimuth Correction Spacer Ring. Azimuth correction spacer rings are used to 

correct the alignment of light fixtures attached to misaligned Type L-868 bases. 

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AC 150/5345-42F October 17, 2006 

3.1.3.2 Conduit Connections. Conduit connections permit connection of underground conduit 

to the bases. Conduit connections (number, type, size, and location) are to be provided as 

specified and must meet the environmental requirements of the Class base with which they are 

utilized. Conduit connections may include hubs, grommets, or other devices suited for the 

application. 

3.1.3.3 Adapter Rings. Adapter rings are used for converting the bolt circle of an existing base 

to that of a fixture having a different bolt circle or to that of a threaded adaptor ring for adjustable 

threaded extensions. No modification of the existing base should be required. All fixture 

mounting bolts must have at least 1⁄2 inches (13 mm) of thread engagement into the ring. 

3.1.3.4 Base Extensions, Fixed and Adjustable. Base extensions are used to provide height 

adjustments to both Type L-867 and Type L-868 bases. They are used with bases when the 

required new elevation exceeds the capability of spacer rings to obtain it. 

Base extension capability can be provided by installing either a fixed extension or a field 

adjustable extension that conforms to the top flange of an existing type base and that has the 

same dimensional top flange and fixture clearance as the existing base. Care should be taken to 

ensure that the proper Class of extension is utilized. Extensions are equal to or greater than 1-3/4 

inches (44 mm) for Type L-867 and 2 inches (51 mm) for Type L-868. Extensions and spacers 

will be dimensioned as shown in Figures 3 and 8. Note that fixed extensions are shown for 

dimensional purposes only. Various methods of providing adjustable heights are possible 

(including proprietary stainless steel adjustable threaded extensions), but all must meet the 

applicable dimensions of these figures. 

Type L-867 bases with provisions for height adjustment may be specified to meet local 

conditions. These base extensions, which rely on the top flange and the embedment material to 

support the load, are not suitable for direct earth burial. If the adjustable height base is intended 

to support the load without top flange and embedment assistance, it is suitable for direct earth 

burial and must be capable of withstanding the full load test requirement at its maximum 

extension. 

All bases that utilize a method of height adjustment that is integral to the base or extension and is 

intended for field adjustment must, during qualification testing, be subjected to a torque test to 

ensure there will be no top flange rotation under normal operating conditions. Reference 

paragraphs 4.1.7, 4.2.8, and 4.3.10. 

3.1.3.5 Covers. Various covers are available to facilitate the proper installation of bases. All 

covers must utilize manufacturer furnished fully threaded 18-8 stainless steel, hex head 3/8′′ (10 

mm) bolts long enough to provide full thread engagement into the mounting surface. 

3.1.3.5.1 Blank Covers. Blank covers are used to provide a cover for bases when no light fitting 

is to be installed. They must be metallic and meet the applicable dimensional requirements of 

the type base to which they are attached. For Type L-868 load bearing bases, the cover must be 

equal in thickness to the light fixture. For Type L-867B and Type L-867D non-load bearing 

bases, the cover must be a minimum of 3/8 inches (10 mm). For Type L-867E bases, the cover 

must be a minimum of 1⁄2 inch (13 mm). Covers thicker than 3⁄4 inch (19 mm) must have (2) 

opposite holes of the (6) 7/16 inch (11 mm) through holes tapped 1⁄2"-13 as a means to affix a 

lifting eye for ease of removal. All cover plates 1⁄2 inch (13 mm) or thicker must have all bolt 

holes counter-bored 1-1/8 inches × 3/8 inches (29 mm × 10 mm) deep. 

6 
October 17, 2006 AC 150/5345-42F 

3.1.3.5.2 Mud Covers. Mud covers may stand alone or may be used in conjunction with 

plywood covers on Type L-867 and Type L-868 bases to protect the base flange during 

construction, and to include surface marking to facilitate locating the center of the base when 

coring out to locate the base after pavement overlay. Mud covers are appropriately sized for the 

specific bases they are to protect. 

3.1.3.5.3 Shipping Covers. Plywood covers are used to protect bases during shipping and 

installation and are to be installed on all base or base extension shipments. For all galvanized 

bases, a 3 mil poly shipping gasket may be installed between the base and plywood cover or, as 

an alternative, the plywood cover should be waxed on the bottom surface to eliminate the 

bonding action of the plywood and zinc. The Type L-868 plywood cover should also be waxed 

on the OD edge to facilitate easy removal from any surrounding embedment material. Plywood 

should be exterior grade 1⁄2 inch (13 mm) thick bb/cc or other material of equal strength and 

weather resistance (reference figure 9) for Type L-867 and equal to the thickness of the light 

fixture [3/4 inch (19 mm) or 1-3/4 inch (44.5 mm)] to be installed on the Type L-868 base. 

When shipped with a mud cover on top, the total thickness of mud cover and plywood cover 

must equal the thickness of the light fixture. 

NOTE: The thickness of the fixture is determined to be the height of fixture flange at the OD of 

the fixture. 

3.1.3.6 Grounding Lugs. For the purpose of enhancing safety, each base must have installed, 

by the manufacturer, an internal and external ground strap that is available for the purpose of 

attaching a ground lug that is connected to an earth ground or a safety ground conductor installed 

in the series circuit conduit. For Class I bases, a metallic ground connector or strap must be 

welded to the interior and exterior wall of each base before applying surface protection. The 

details and location of the ground connectors are shown in Figures 2 and 6. The location of the 

connector may be varied to meet specific conditions. A bronze or copper ground connector 

should not be fastened to the ground connector or strap until after the base surface protection is 

applied. For Class II bases, the ground connector or strap must provide a positive ground 

connection path to a light fixture mounting bolt. 

3.1.3.7 Drains. The conduit/base system, which protects the series circuit cable, should have 

drains installed in the bases at low points in the system to provide for drainage of water and 

deicing fluids away from the base and conduit system, which if allowed to pool for long periods 

of time, will hasten corrosion of the conduit/base system. 

3.2 Fabrication and Materials. Bases and related accessories, designed to function as light 

bases, transformer housings, and junction boxes, must be fabricated of suitable material to meet 

the following standards. Appropriate separation material must be used between dissimilar metals 

to prevent galvanic action between flange rings, spacer rings etc. Copper ground components 

and stainless steel bolts are exempted. This separation material must not deform at 450 psi (a 

load equivalent to the L-868 load test) to prevent compression and subsequent loosening of bolts. 

3.2.1 Type L-867, Class IA and Class IB Bases and Extensions. Type L-867 Class IA bases 

and extensions must be fabricated from an appropriate metal using fabrication techniques that 

will produce units meeting the appropriate testing requirements of paragraph 4.1. Class IB bases 

must be fabricated from metal using fabrication techniques that will produce units meeting the 

appropriate testing requirements of paragraph 4.1. All bases and extensions (excluding spacers 

and covers) must be labeled using a suitable long lasting contrasting color ink stamp with either 

7 
AC 150/5345-42F October 17, 2006 

the letter A or B to indicate the Class suffix under which the certification has been obtained. The 

stamp must be a minimum of one inch (25 mm) in height and placed on the exterior wall of the 

base, no more than 6 inches (152 mm) below the base flange. All components described in this 

paragraph must be manufactured such that their use does not require existing bases, extensions or 

any existing components installed in the ground to be cut or modified in any manner. The 

modification of standard, certified components renders them non-standard and voids their 

certification. The only exception to this is the cutting of additional conduit holes during 

installation and the installation of threaded inserts in the flange as these do not affect the 

structural integrity of a standard unit. 

3.2.1.1 Flange. The dimensions of the flange must be as shown in Figure 1. The flat surface of 

the flange must be installed at an angle of 90 ±0.25 degrees to the axis of the cylindrical body. 

The flange must be continuously attached to the body to provide a watertight seal. 

3.2.1.2 Body. The body, including the sides and bottom, must be fabricated from one or more 

pieces. The standard dimensions of the body must be as shown in Figure 2. Two conduit 

entrances must be provided and installed near the bottom of the base. The location and size, as 

shown in Figure 2, is considered standard. However, the location, number, type, and size can be 

altered to meet project requirements. Any sharp edges formed on the inside of the body must be 

removed to prevent cutting or chafing of the cable insulation. The length of the body section as 

shown in Figure 2 is considered standard, but the length may be varied to meet special 

conditions. 

3.2.1.3 Extensions. The dimensions of the extensions and spacer rings must be as shown in 

Figure 3. Extensions for Type L-867 bases must be ordered to length with a minimum length of 

1-3/4 inches (44.5 mm) and a tolerance of ±l/16 inch (1.5 mm). Flat spacer rings are utilized for 

height adjustments from l/16 inch (1.5 mm) through l-11/16 inches (42.86 mm) in l/16 inch (1.5 

mm) increments. In order to preserve the base integrity, a maximum of three spacer rings may 

be stacked together. 

3.2.1.4 Adjustable Height Type L-867, Class IA and Class IB Bases and Extensions. 

Adjustable height Type L-867, Class IA and IB bases and extensions must have a provision 

inherent to their design for adjusting the height of the top flange. Various methods of providing 

height adjustment are possible (including proprietary stainless steel adjustable threaded 

extensions). The top flange must have the identical dimensions as the top flange of the standard 

base. For adjustable bases, the body must also have the identical dimensions as the standard 

base. For adjustable extensions, the top flange and body of the extension must also be 

compatible with lighting fixtures and with existing parts in the ground without field 

modifications to certified parts. The adjustable top flange and supporting wall may mate into the 

base body either externally or internally of the base supporting wall. If the adjustable base is 

designed for installation in earth (no embedment support required), the base must be load tested 

fully extended in free space. If the base requires portland cement concrete (PCC) embedment in 

order to meet the loading requirements, it may be tested with supporting PCC embedment to 

simulate actual installation as directed by the testing laboratory. The manufacturer must indicate 

by the suffix “PCC” to the catalog number that the base does not meet the load requirements of 

Type L-867, unless the top base flange is embedded and supported by PCC. These bases must 

be dimensioned as shown in Figure 2 with regard to fixture interface and critical dimensions. 

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October 17, 2006 AC 150/5345-42F 

3.2.1.5 Bolts. Bolts suitable for use in threaded holes, as shown in Figures 1 and 2, must be 

supplied with each base and extension assembly. The bolts must conform to the dimensions 

specified in the notes in Figures 1, 2, and 3 and must be fully threaded and fabricated from 18-8 

stainless steel. 

3.2.2 Type L-867, Class IIA and Class IIB Bases and Extensions. Type L-867 bases and 

extensions, Class IIA and IIB, must be fabricated from suitable materials and dimensioned so as 

to produce units meeting the appropriate testing requirements of paragraph 4.2. All bases and 

extensions (excluding spacers and covers) must be labeled using a suitable long lasting 

contrasting color ink stamp with either the letter A or B to indicate the Class suffix under which 

the certification has been obtained. The stamp must be a minimum of one inch (25 mm) in 

height and placed on the exterior wall of the base, no more than 6 inches (152 mm) below the 

base flange. All components described in this paragraph must be manufactured such that their 

use does not require existing cans, extensions, or any existing components installed in the ground 

to be cut or modified in any manner. The modification of standard certified components renders 

them non-standard and voids their certification. The only exception to this is the cutting of 

additional conduit holes during installation and the installation of threaded inserts in the flange as 

these do not affect the structural integrity of a standard unit. 

3.2.2.1 Flange. The flange must be fabricated from suitable materials and must meet the same 

critical lighting fixture interface dimensions specified for Class I in Figure 1. Flange thickness 

and material should be sufficient to pass the load test specified in paragraph 4.1.1. The flange 

must be continuously attached to the body to provide a watertight seal. 

3.2.2.2 Body. The body, sides, and bottom may be fabricated from one or more pieces. The 

sides and bottom must be fabricated from suitable materials sufficient to pass the load test 

described in paragraph 4.2.1. Two conduit entrances must be installed near the bottom of the 

base. The location and size, as shown in Figure 2, must be considered standard. However, the 

location, number, type, and size may be altered to meet project requirements. Any sharp edges 

formed on the inside of the body must be removed to prevent cutting or chafing of the cable 

insulation. The length of the body section as shown in Figure 2 must be considered standard, but 

the length may be varied to meet special conditions. 

3.2.2.3 Extensions. The dimensions of the extensions and spacer rings must be as shown in 

Figure 3. Extensions must be fabricated of the same materials and dimensions specified in 

paragraphs 3.2.2.1 and 3.2.2.2. Extensions must be ordered to length with a minimum length of 

l-3/4 inches (44.5 mm) and a tolerance of ±l/16 inch (1.5 mm). Flat spacer rings are utilized for 

height adjustments from l/16 inch (1.5 mm) through l-11/16 inches (42.86 mm) in l/16 inch (1.5 

mm) increments. In order to preserve the base integrity, a maximum of three spacer rings may 

be stacked together. 

3.2.2.4 Adjustable Height Type L-867, Class IIA and Class IIB Bases and Extensions. 

Adjustable height Type L-867, Class IIA and IIB bases and extensions must have a provision 

inherent to their design for adjusting the height of the top flange. Various methods of providing 

height adjustment are possible (including proprietary stainless steel adjustable threaded 

extensions). The top flange must have the identical dimensions as the top flange of the standard 

base. The top flange must have the identical dimensions as the top flange of the standard base. 

For adjustable bases the body must also have the identical dimensions as the standard base. For 

adjustable extensions the top flange and body of the extension must also be compatible with 

9 
AC 150/5345-42F October 17, 2006 

lighting fixtures and with existing parts in the ground without field modifications to certified 

parts. The adjustable top flange and supporting wall may mate into the base body either 

externally or internally of the base supporting wall. If the adjustable base is designed for 

installation in earth (no embedment support required) the base must be load tested fully extended 

in free space. If the base requires PCC embedment in order to meet the loading requirements, it 

may be tested with supporting PCC embedment to simulate actual installation as directed by the 

testing laboratory. The manufacturer must indicate by the suffix “PCC” to the catalog number 

that the base does not meet the load requirements of Type L-867 unless the top base flange is 

embedded and supported by PCC. These bases must be dimensioned as shown in Figure 2 with 

regard to fixture interface and critical dimensions. 

3.2.2.5 Bolts. Bolts suitable for use in threaded holes as shown in Figures 1, 2, and 3 must be 

supplied with each base and extension assembly. The bolts must conform to the dimensions 

specified in the notes in Figures 1, 2, and 3, and must be fully threaded and fabricated from 18-8 

stainless steel. 

3.2.3 Type L-867 Accessories. Various accessories are necessary to facilitate construction 

involving Type L-867 bases or to make corrections or adjustments to Type L-867 bases. These 

accessories are detailed in Figure 4. 

3.2.4 Type L-868, Class IA and Class IB Bases and Extensions. Type L-868, Class IA bases 

and extensions, must be fabricated from an appropriate metal* and constructed in such a manner 

as to meet the appropriate testing requirements given in paragraph 4.3. Class IB bases and 

extensions must be fabricated from an appropriate metal* and constructed in such a manner as to 

meet the appropriate testing requirements specified in paragraph 4.3. 

*If a material other than ASTM A36 steel is used for a major load bearing structural component, 

the material must meet the mechanical property yield and tensile values of A36 steel. A material 

with yield and tensile stress values lower than the minimum specified values of A36 steel may be 

used if the manufacturer can demonstrate conformance to the requirements set forth in section 4 

of this specification. 

All bases and extensions (excluding spacers and covers) must be labeled using a suitable long 

lasting contrasting color ink stamp with either the letter A or B to indicate the Class suffix under 

which the certification has been obtained. The stamp must be a minimum 1 inch (25 mm) in 

height and placed on the exterior wall of the base, no more than 6 inches (152 mm) below the 

base flange. 

All components described in this paragraph must be manufactured such that their use does not 

require existing cans, extensions or any existing components installed in the ground to be cut or 

modified in any manner. The modification of standard, certified components renders them nonstandard and voids their certification. The only exception to this is the cutting of additional 

conduit holes during installation and the installation of threaded inserts in the flange as these do 

not affect the structural integrity of a standard unit. 

3.2.4.1 Flange. The dimensions of the flange must be as shown in Figure 5. The flat surface of 

the flange must be installed at an angle of 90 degrees, ±0.125 degree, to the axis of the 

cylindrical body of the base. The flange must be continuously attached to the body to provide a 

watertight seal. The flange faces, outside and inside diameter, must be finished in accordance 

with ASME B 46.1. Bolt hole size and placement must be as shown in Figure 5. Bolt hole may 

10 
October 17, 2006 AC 150/5345-42F 

be integral to the flange or contained in metal insert located in the flange. A specified bolt 

installed in the flange bolt hole must be capable of accepting a bolt torque test as indicated in 

paragraph 4.3.4. As part of the base testing, any insert or remedial device used for correcting 

threads damaged while in service must be tested in the base flange as part of the base in which it 

is intended for service. 

3.2.4.2 Body. The body section, sides and bottom, may be formed from one or more pieces. 

One piece body sections must have an anchor ring (mid-ring) attached to the body by a 

continuous weld applied to the upper side and lower side of the ring as shown in Figure 6. The 

length of the one piece body section shown in Figure 6 must be considered a standard, but the 

overall length may vary to meet specific conditions. Two 2-inch (51 mm) conduit entrances 

must be provided near the bottom of the body. The location, number, and size of conduit 

entrances shown in Figure 6 must be considered standard, but the size, location, and number of 

connections may be varied to meet specific conditions. Any sharp edges at the conduit entrances 

must be removed to prevent cutting or chafing of the cable insulation. When sectional bases are 

specified, the sections must be dimensioned as shown in Figure 7. 

3.2.4.3 Extensions. Extensions must be fabricated from the appropriate metal for either Class IA 

or Class IB bases. The dimensions of extensions must be as shown in Figure 8. The minimum 

extension length must be 2 inches (51 mm) flat spacer rings must be used for height corrections 

of l/16 inch (1.6 mm) to l-15/16 inches (49 mm) in l/l6 inch (1.6 mm) increments. Flat spacer 

ring dimensions are shown in Figure 8. If specified, grooved spacer rings may be used for height 

corrections of l/4 inch (3.2 mm) to l-15/16 inches (49 mm) in l/16 inch (1.6 mm) increments. 

3.2.4.4 Adjustable Height Type L-868, Class IA and Class IB Bases and Extensions. 

Adjustable height Type L-868, Class IA and IB bases and extensions must have a provision 

inherent to their design for adjusting the height of the top flange. Various methods of providing 

height adjustment are possible (including proprietary stainless steel adjustable threaded 

extensions). The top flange must have the identical dimensions as the top flange of the standard 

base. For adjustable bases the body must also have the identical dimensions as the standard base. 

For adjustable extensions the top flange and body of the extension must also be compatible with 

lighting fixtures and with existing parts in the ground without field modifications to certified 

parts. The adjustable top flange and supporting wall may mate into the base body either 

externally or internally of the base supporting wall. 

3.2.4.5 Bolts. Bolts suitable for use in the threaded holes as shown in Figures 5, 6, and 7 must be 

supplied with each spacer ring. These bolts must be of sufficient length to provide a full thread 

connection with the base flange when the spacer ring is inserted between the light fixture and the 

base flange. If bases or extensions are ordered without spacer rings, bolts conforming to the 

dimensions specified in the notes in Figures 5, 6, and 7 must be supplied. All bolts must be fully 

threaded and fabricated from 18-8 stainless steel and supplied with stainless steel locking 

washers. 

NOTE: Anti-seize material is recommended to be furnished and utilized by the installing 

contractor when installing bolts (Reference AC 150/5340-30). Anti-seize material is normally 

not supplied by the base manufacturer due to the various airport preferences for different brands 

of material. 

11 
AC 150/5345-42F October 17, 2006 

3.2.5 Type L-868 Accessories. Various accessories are necessary to facilitate construction 

involving Type L-868 bases or make corrections or adjustments to Type L-868 bases. These 

accessories are detailed in Figure 9. 

3.2.6 Grounding Lugs. Ground connectors or straps must be supplied with each base. A 

metallic ground connector or strap must be welded to the interior and exterior wall of each base 

before applying surface protection. The details and location of the ground connectors are shown 

in Figure 6. The location of the connector may be varied to meet specific conditions. A bronze 

or copper ground connector should not be fastened to the ground connector or strap until after the 

base surface protection is applied. 

3.2.7 Drains. If specified, a drain should be provided in the bottom of the base prior to applying 

surface protection. When not otherwise specified, the drain should be 3/4 inch (19 mm) in 

diameter. 

3.2.8 Protective Coating. After fabrication, burrs and sharp edges must be removed, and all 

ferrous metal parts must be treated for corrosion protection. Prior to tapping operations, all parts 

of Class I bases, extensions, and spacer rings in excess of l/4 inch (6.35 mm) in thickness must 

be hot-dip galvanized, as specified in ASTM A123/A123M-02 , and applied in accordance with 

ASTM A 385-03 . Flanges, covers, and rings must be wiped smooth to a flatness of ±0.010 inch 

(0.254 mm). Plates and rings l/4 inch (6.35 mm) or less in thickness, grooved extensions, and 

grooved spacer rings when made of ferrous metal must be plated with zinc in accordance with 

the requirements of ASTM B 633, Type II, Class I or hot dip galvanized in accordance with 

ASTM A123/A123M-02. Tapped holes for conduit must be protected with a polyurethane 

varnish or equivalent. A zinc dust primer meeting MIL-PRF-26915 must be permitted for 

touchup. The area covered by zinc dust primer must not exceed 10 percent of the total treated 

area. Any cast iron may be coated with a minimum of 2.0 mils of oxyplast powder in lieu of 

galvanizing. Class IA base extensions and spacer rings must utilize surface protection, as 

required, meeting the appropriate testing requirements stated in paragraph 4.4. 

12 
October 17, 2006 AC 150/5345-42F 

SECTION 4. QUALITY ASSURANCE PROVISIONS 

Equipment produced under this specification may be eligible for funding for installation on 

airports under Federal grant assistance programs for airports. In order to be eligible for 

installation under Federal grant assistance programs, manufacturers of the types of equipment 

specified herein are required to certify or furnish proof to the airport sponsor, or the sponsor’s 

representative, that the equipment is certified by an FAA-approved Third Party Certification 

Body to meet the following test specimen, and production provisions established in paragraphs 

4.1, 4.2 and 4.3 Certification Testing. Certification testing is intended to assure that the materials 

and fabrication methods are adequate to provide acceptable in-service performance of bases. 

Certification testing is required for each type, class, and size of base produced. The third party 

certification body must make a permanent record (for up to seven years beyond the life of the 

certification) of the exact material and fabrication process used for the prototype submitted for 

certification. Any change in material or fabrication process requires the certification of the 

resultant product as a new product being submitted for certification. After testing and 

qualification are complete, the prototype accepted for qualification must serve as the dimensional 

and workmanship model for all subsequent production units. 

4.1 Type L-867, Class IA and Class IB Certification Testing. Type L-867, Class IA and Class 

IB bases and extensions fabricated in accordance with the materials and dimensions specified 

herein must be capable of passing the following tests: 

4.1.1 Type L-867, Class IA and Class IB Load Test. Sample bases and extensions must be 

subject to the load test described below. The base and cover assembly or assemblies including 

spacer rings, extensions, and multi-section bodies must be bolted together and placed on a flat 

steel plate mounted in a standard testing machine. The test section must be a unit in height 

deemed to be the maximum height to be furnished by the manufacturer with four 2 inch (51 mm) 

conduit entrances located in the body section, located at 90 degree increments, 2-l/2 inches (64 

mm) from the bottom of the base. A load must be applied to the top part of the base through a 

block of rubber l-1/2 inches (38 mm) thick, with a diameter equal to the cover plate, and having a 

durometer hardness of 55 to 70. A load of 250 psi (1724 kPa) must be applied uniformly over 

the area of the rubber block at a rate not to exceed 10,000 pounds (4536 kg) per minute. The 

base or any of the components will be considered unsatisfactory if there is any permanent 

deformation or cracking of material or coating. The above test will be repeated three times. 

After each loading, bolts must be checked for loss of tension. The bolts must be torqued to the 

manufacturer’s recommended service torque after the first two loadings. The base and/or 

assembly will be considered unsatisfactory if there is any loss of torque in the bolts or permanent 

deformation of the flange or coating after the third loading. Load testing is to be performed on 

free standing units. 

4.1.1.1 Type L-867, Class IA and Class IB Load Test, Adjustable Height Bases and 

Extensions. If the adjustable base or extension is designed for installation in earth (no 

embedment support required), the base or extension must be tested fully extended in free space 

and must be subject to the load test in paragraph 4.1.1. If the base or extension requires PCC 

embedment in order to meet the loading requirements, it may be tested to the requirements in 

paragraph 4.1.1 with supporting PCC embedment to simulate actual installation as directed by 

the testing laboratory. 

13 
AC 150/5345-42F October 17, 2006 

4.1.2 Type L-867, Class IA and Class IB Weld Integrity Test. This test must be performed 

after each assembly has undergone the load test described in paragraph 4.1.1. An internal air or 

hydraulic pressure of 12 psi, ±2 psi, (83 kPa, ±14 kPa) must be maintained within the assembly 

using pressure fittings. The conduit entrances must include a sample of the conduit interfaces 

(hub, grommet etc.) that are offered by the manufacturer for interfacing to the conduit. The 

conduit entrances must include conduit stubs suitably plugged during the conducting of the test. 

A high foam soap or detergent solution of low surface tension must be brushed on welds, seams, 

and joints to detect leakage. Alternatively, the assembly may be submerged in a tank of water 

while pressurized to detect any air leakage. The assembly will be considered unsatisfactory if 

leakage is evident. The conduit entrances must be placed at least 24 inches (0.6 m) below the 

water surface. Any leakage of water into the assembly will be cause for rejection. 

NOTE: This test is also to be performed on bases designed to be field height adjustable, but the 

extension itself does not have to be in place. 

4.1.3 Type L-867, Class IA and Class IB Dimensional Tests. Specimens must be measured 

for conformance to the dimensions specified in Figures 1, 2, 3, and 4, as applicable. Should any 

new product be introduced that does not exactly conform to the fixed products shown, the 

applicable dimensions necessary to ensure compatibility with certified light fixtures and bases 

must be applied. 

4.1.4 Type L-867, Class IA and Class IB Protective Coating Thickness Test. When utilized, 

the thickness of protective coatings must equal or exceed those specified herein. The weight of 

hot-dip galvanizing must be tested according to the method described in ASTM A 153. Zinc 

plating thickness must be tested by a method described in ASTM B 633. 

4.1.5 Type L-867, Class IA and Class IB Visual Inspection. Each unit must be visually 

inspected for quality of workmanship and materials. The specified Class marking must be 

inspected for correctness. Particular attention must be given to smoothness and continuity of 

welds and seams, flatness and smoothness of the flange surface, complete and uniform 

application of the protective coating, freedom from excess zinc when applicable, and absence of 

burrs, sharp edges, cracks, voids, penetrations or any other imperfection that could potentially 

affect the structural integrity or performance of the product. 

4.1.6 Type L-867, Class IB Potassium Acetate Test. Those bases and extensions certified to 

Type L-867 Class IB requirements must be subjected to testing to determine if they are resistant 

to corrosion caused by deicing fluids containing potassium acetate. The test consists of taking a 

test base and filling it half full with a potassium acetate deicing fluid composed of 50 percent 

potassium acetate and 50 percent water, by weight. The test base will have conduit connecting 

devices identical to that to be furnished with the base with conduit stubs plugged and the top of 

the base must be covered with an appropriate blank cover and gasket. The test base will remain 

for 21 days at an elevated temperature of 194°F (90oC). After the test period the base and spacer 

ring must be inspected. There must be no evidence of corrosion or leakage. 

4.2 Type L-867, Class IIA and Class IIB Certification Testing. Type L-867, Class IIA and 

Class IIB bases and extensions fabricated from materials to dimensions as specified herein must 

be capable of passing the following tests. 

4.2.1 Type L-867, Class IIA and Class IIB Load Test. Sample bases and extensions must be 

subjected to the load test described in paragraph 4.1.1. 

14 
October 17, 2006 AC 150/5345-42F 

4.2.2 Type L-867, Class IIA and Class IIB Weld Integrity Test. Sample bases and extensions 

must be subjected to the leakage test described in paragraph 4.1.2. 

NOTE: This test is also to be performed on bases designed to be field height adjustable, but the 

extension itself does not have to be in place. 

4.2.3 Type L-867, Class IIA and Class IIB Temperature Shock Test. Temperature shock test 

requirements apply only to Class II, non-metallic, Type L-867 bases. A temperature shock test 

must be conducted on a completed non-metallic base assembly. The test must be performed 

according to MIL-STD-810, Method No. 503.2, Paragraph II, Procedure I. The high test 

temperature must be conducted at +130oF (+54oC) and the low test temperature must be 

conducted at -65oF (-54oC). This test must be conducted on the assembly after the load test 

described in paragraph 4.1.1 has been concluded. Any cracking or joint separation of the 

materials making up the base assembly will be cause for rejection. 

4.2.4 Type L-867, Class IIA and Class IIB Dimensional Tests. Specimens must be measured 

for conformance to the dimensions specified in Figures 1, 2, 3, and 4, as applicable. Mounting 

flange and base wall thicknesses must be measured and must be equal to or greater than those 

required to pass the load test and torque test described in paragraph 4.1.1. Should any new 

product be introduced that does not exactly conform to the fixed products shown, the applicable 

dimensions necessary to ensure compatibility with certified light fixtures and bases must be 

applied. 

4.2.5 Type L-867, Class IIA and Class IIB Protective Coating Thickness Test. For 

components of the base or assembly requiring protective coatings, the thickness of protective 

coatings must be tested in accordance with paragraph 4.1.4. 

4.2.6 Type L-867, Class IIA and Class IIB Visual Inspection. Bases must be visually 

inspected in accordance with paragraph 4.1.5. 

4.2.7 Type L-867, Class IIB Potassium Acetate Test. Those bases and extensions certified to 

Type L-867 Class IIB requirements must be subjected to testing to determine if they are resistant 

to corrosion caused by deicing fluids containing potassium acetate. The test must be conducted 

in accordance with paragraph 4.1.6. 

4.3 Type L-868, Class IA and Class IB Certification Testing. Type L-868, Class I bases and 

extensions fabricated in accordance with the materials and dimensions specified herein must be 

capable of passing the following tests. 

4.3.1 Type L-868, Class IA and Class IB Load Test. Sample bases and extensions must be 

subject to the load test described in paragraph 4.1.1 with the following exception. A load of 450 

psi (3,103 kPa) must be applied uniformly over the area of the rubber block at a rate not to 

exceed 10,000 pounds (4,536 kg) per minute. The test section must be a unit in height deemed to 

be the maximum height, to be furnished by the manufacturer. For 8 inch (203 mm) Type L-868, 

one inch (25 mm) conduit entrances must be used. 

4.3.2 Type L-868, Class IA and Class IB Fatigue Test. If a material other than ASTM A36 

steel is used for a major load-bearing structural component, the material must have a fatigue limit 

or endurance limit no less than 27 ksi (186 MPa). Specimens from the proposed material must 

be able to withstand a minimum of 5 × 107

 cycles at 27 ksi (186 MPa) by a standard R.R. Moore 

rotating beam fatigue test using polished specimens. No less than three tests must be conducted 

to validate the material’s fatigue properties. 

15 
AC 150/5345-42F October 17, 2006 

4.3.3 Type L-868, Class IA and Class IB Impact Test. If a material other than ASTM A36 

steel is used for a major load-bearing structural component, the material must have an impact 

toughness equal to or greater than 15 ft-lb (20 J) at 20°F (-7°C), per the Charpy V-notch test 

specified in ASTM E 23. No less than three tests must be conducted to validate the material’s 

impact properties. 

4.3.4 Type L-868, Class IA and Class IB Flange Bolt Torque Test. Flanges must be tested by 

inserting 18-8 stainless steel fixture mounting bolts in all 6 bolt holes and torquing all bolts to 

failure. Any cracking or permanent deformation of the flange material will be cause for 

rejection. Any rotation or distortion of installed remedial devices or replaceable inserts will also 

be cause for rejection. 

4.3.5 Type L-868, Class IA and Class IB Weld Integrity Test. Sample bases and extensions 

must be subjected to the leakage test described in paragraph 4.1.2. 

NOTE: This test is also to be performed on bases designed to be field height adjustable, but the 

extension itself does not have to be in place. 

4.3.6 Type L-868, Class IA and Class IB Dimensional Tests. Specimens must be measured 

for conformance to the dimensions specified in Figures 5-9, as applicable. Should any new 

product be introduced that does not exactly conform to the fixed products shown, the applicable 

dimensions necessary to ensure compatibility with certified light fixtures and bases must be 

applied. 

4.3.7 Type L-868, Class IA and Class IB Protective Coating Thickness Test. For 

components of the base or assembly requiring protective coatings, the thickness of protective 

coatings must be tested in accordance with paragraph 4.1.4. 

4.3.8 Type L-868, Class IA and Class IB Visual Inspection. Specimens must be subject to 

visual inspection as described in paragraph 4.1.5. 

4.3.9 Type L-868, Class IB Potassium Acetate Test. Bases and Extensions must be subjected 

to testing to determine if they are resistant to corrosion caused by deicing fluids containing 

potassium acetate. The test must be conducted in accordance with paragraph 4.1.6. 

4.3.10 Type L-868, Class IA and Class IB Torque Test for Adjustable Height Bases and 

Extensions. All L-868 bases and extensions that utilize a method of height adjustment that is 

inherent to their design that are designed for field adjustment must be subjected to a torque test. 

The test base must be held in the maximum adjustable height position utilizing the locking 

method that will be utilized in the actual installation. A torque of 100,000 in-lbs (11,000 

Newton-meters (N-m)) must be applied perpendicular to the vertical axis of the base utilizing a 

steel cover plate. The maximum torque must be achieved within 60 seconds of the start of the 

test. The torque load must be applied three times. Upon completion of the third torque loading, 

a measurement must be taken to determine if the base top flange has been displaced in azimuth. 

An azimuth displacement of 0.25 degree or greater will be cause for rejection. All welds or 

seams must be examined for integrity and any failure will be cause for rejection. 

NOTE: The locking method is defined as the method of locking that is inherent to the device 

itself. This does not include any type of embedment material that is used as a part of the 

installation - grout, concrete, asphalt, etc. In the past, torque testing in embedment material was 

permitted providing that production testing included random samples being torque tested in the 

field following installation to verify that the proper grout, etc., was applied in the proper manner 

16 
October 17, 2006 AC 150/5345-42F 

as was done in the lab. History has shown that it is not possible to ensure that the appropriate 

production testing will be performed in the field for this verification to be made. Therefore, 

devices are to be tested free standing and the requirement to perform torque testing of random 

samples in the field is rescinded. 

4.4 Production Testing 

4.4.1 Lot Size. The lot size must be equal to the daily production rate. 

4.4.2 Sample Size and Acceptance Criteria. Production testing must be based on the 

procedures given in ASQC Z1.4. Sample size and acceptance criteria must be based on Table 1 

(Sample Size Code Letters), General Inspection Level I, Table II-A (Single Sampling Plans for 

Normal Inspection), and an Acceptable Quality Level (AQL) of 2.5. Note that normal inspection 

may be switched to reduced inspection provided the conditions set forth in ASQC Z1.4 are met. 

4.4.3 Retesting. If the lot is rejected, the remainder of the lot may be tested and inspected on an 

individual basis. As an alternative to individual testing and inspection, the remainder of the lot 

may be tested using criteria in ASQC Z1.4 for multiple sampling. Table IVB, Multiple Sampling 

Plans for Tightened Inspection, using the appropriate sample size and an AQL of 2.5, must be 

used. Should the lot fail under the multiple sampling plan criteria, all units must be inspected 

and tested individually and repaired as necessary. Any samples that fail under any of the above 

criteria must be repaired prior to shipment. 

4.4.4 Type L-867, Class IA and Class IB. 

4.4.4.1 Dimensional Tests. Random samples from each lot must be subjected to dimensional 

tests as described in paragraph 4.1.3. 

4.4.4.2 Visual Inspection. Random samples from each lot must be subjected to visual 

inspection as described in paragraph 4.1.5. 

4.4.4.3 Weld Integrity Test. Random samples from each lot must be subjected to the leakage 

test described in paragraph 4.1.2, except that load testing of production samples is not required. 

4.4.5 Type L-867, Class IIA and Class IIB. 

4.4.5.1 Dimensional Tests. Random samples from each lot must be tested in accordance with 

paragraph 4.2.4. 

4.4.5.2 Visual Inspection. Random samples from each lot must be visually inspected in 

accordance with paragraph 4.1.5. 

4.4.5.3 Weld Integrity Test. Random samples from each lot must be subjected to the leakage 

test described in paragraph 4.1.2, except that load testing of production samples is not required. 

4.4.6 Type L-868, Class IA and Class IB. 

4.4.6.1 Dimensional Test. Random samples from each lot must be tested for conformance to the 

dimensional test described in paragraph 4.3.6. 

4.4.6.2 Visual Inspection. Random samples from each lot must be inspected for conformance to 

the requirements in paragraph 4.3.8. 

4.4.6.3 Weld Integrity Test. Random samples from each lot must be subjected to the leakage 

test described in paragraph 4.1.2, except that load testing of production samples is not required. 

17 
AC 150/5345-42F October 17, 2006 

Intentionally left blank. 

18 
October 17, 2006 AC 150/5345-42F 

SECTION 5. PREPARATION FOR DELIVERY. 

5.1 Packing. Equipment must be carefully packaged for shipment and delivery to avoid damage 

and/or corrosion. Protective covers are to be included on all bases. (See paragraph 3.1.3.5.3) 

5.2 Marking. Equipment must be marked for shipment with the consignee’s name and address, 

and other pertinent information as needed by the installer. Marking must include the following 

statement, “Installer: These products have been packed and shipped in accordance with FAA 

recommendations. Products are to be handled carefully so no damage to the structure or finish 

will occur during the installation process.” 

19 
AC 150/5345-42F October 17, 2006 

Intentionally left blank. 

20 
October 17, 2006 AC 150/5345-42F 

Figure 1. Flange, Type L-867, Class IA, Class IB, Class IIA, Class IIB Sizes B 

D E 

Nominal Diameter 12 16 24 

D, Outside Dia 13.500 17.375 24.000 Tolerances, D +0.100 +0.100 +0.100 

-0.000 -0.000 -0.000 

B, Bolt Circle 10.250 14.250 21.500 Tolerances, B ±0.010 ±0.010 ±0.010 C, Inside Dia 9.250 12.375 20.000 Tolerances, C +0.060 +0.060 +0.060 

-0.000 -0.000 -0.000 

E, Chord 5.125 7.125 11.125 Tolerances, E ±0.005 ±0.005 ±0.005 Note: All Dimensions are shown in inches,

To convert from in. to mm multiplyby 25.4.nmeq means no metric equivalent 

Drill & Tap3/8 in. (9.53 mm)16 NC (nmeq)

6 Thru Holes Equally 

Spaced, 

E 

CBD 

0.375 in. minimum. For Class II base

dimension is minimum and exact dimension is dependent on that required 

to meet the loading requirement. 

21 
AC 150/5345-42F October 17, 2006 Sizes Nominal Diameter 12 16 24 A, Inside Dia 12.250 16.250 22.500 Tolerances, A ±0.375 ±0.375 ±0.375 AAA, Bottom Dia 13.000 17.375 24.000 

Tolerances, AAA ±0.100 

±0.100 

±0.100 

NOTES:1. Conduit Entrances Are To Be MadeThe Bolt Hole Axis Of The Flange WithAn Angular Tolerance of ±1°.

2. Supply Six 18-8 Stainless Steel Hex

Head 3/8 in (9.53 m

m) 16 UNC-2

(nmeq) Fully Threaded Bolts 1 in. (25 m

m) Long 

With Each Container.3. Dimensions Shown Are In InchesTo Convert From in. to mm MultiplyBy 25.4. nmeq means no 

metric

eq1uivalent. 

0.375 in. (9.53 m

m) Minimum 

Flange Attached To

Sidewalls With Continuous

The flat surface of the flange

shall be installed at

90°±0.25°to the axis of the 

0.109 in. (2.77 mm) Minimum 

thickness may be greater if

required to meet the base

Bottom attached to Sidewalls with

continuous non-metallic a suitable

ground path to one metalic

threaded hole in the top flange shall

provide continuity to the fixture. 

2 1/2 in (64 m

m) or as specified 

AAA 

Optional Drain hole or hub with size and 

0.109 in. (2.77 mm) Minimum configuration to be specified by the airport

For Class IIA or IIB base the flange thickness may engineer. Hole should not exceed 2 inches

) mm0 24 in (61

A 

Watertight Weld

) mm 150 ( . in 6

l ca Typi 

For Class II base the wall

loading requirements. 

cylindrical body. 

Ground Strap 

for Bronze or 

Copper 

Ground 

Connector 

be greater if required to meet the base loading in diameter. Ref AC 150/5340-30 requirements. 

Figure 2. Body, Type L-867, Class IA, Class IB, Class IIA, Class IIB 

22 
D

16

 17.375 

14.250

±0.010

 12.375

 +0.060

 -0.000 

7.125 

±0.005 

 16.250 

 ±0.375 

E

24

 21 24 .500 ±0.010

 20.000 

+0.060

-0.000

 11.125 

 22.500 

 ±0.375 

Sizes 

B 

Nominal Diameter 12 

D, Outside DiaMinimum 13.500 

B, Bolt Circle 10.250 Tolerances, B ± 0.010 C, Inside Dia 9.250Tolerances, C +0.060 

 -0.000

E, Chord 5.125 Tolerances, E ±0.005 A, Actual Dia 12.250 

Tolerances, A ±0.375 

Extension 

Height to Order1-3/4 inch (44 mm)minimum

Tolerance ±1/16 in.(±1.5 mm) 

CBD 

CBD 

7/16 in(11.1 mm)6 Thru HolesEqually Spaced 

E E 

Flange Thickness 3/8 in. (9.5 mm) for Class I, as Required for Class II 

Flange Thickness 3/8 in. (9.5 mm) for Class I, as Required for Class II 

A

0.109 in (2.77 mm) min. Class 1 As req'd Class II 

NOTES:1. Holes In Top And Bottom Of Extensions Shall BeAligned.2. Supply 6 Stainless Steel 18-8 Hex Head 3/8 in.(9.53 mm) 16 UNC (nmeq) Bolts With Each Extension Sufficiently Long To Provide Minimum 1/2 in. (13 mm)Thread Engagement With Base Container.Supply 6 Stainless Steel 18-8 Hex Head 3/8 in. (9.53 mm)16 UNC (nmeq) Bolts With Each Extension Sufficiently Long to Provide Minimum 1/2 in. (13 mm) Thread EngagementWith Extension Top Flange.3. Tabulated Dimensions Are In Inches, To ConvertFrom in. to mm Multiply By 25.4. nmeq means nometric equivalent.

Spacer Ring 

1/16 in (1.5 mm)

to

1 11/16 in (43 mm) 

Drill & Tap3/8 in (9.53 mm)16 NC (nmeq)6 Thru HolesEqually Spaced.Tap after

application ofprotectivecoating 

Drill 7/16 in(11.1 mm) 6 ThruHoles EquallySpaced 

October 17, 2006 AC 150/5345-42F 

Figure 3. Extensions, Type L-867, Class IA, Class IB, Class IIA, Class IIB 

Top and Bottom Attached to Sidewalls With Contunous

Watertight Connection. 23 
D, Outside Dia

Tolerances, DB, Bolt Circle DiaTolerances, BT, Thicknesst, Thickness 

B

13.500+0.100

-0.000

10.250

±0.010

0.375 

1/2 

Sizes 

D

17.375

+0.100

-0.000

14.250±0.010

0.375 

1/2 

E

24.000

+0.100

-0.000

21.500

±0.010

0.500

1/2 

Notes: 

1. Supply 18-8 Stainless Steel Hex Head 3/8 (9.53 mm)UNC 16 (nmeq) Bolts Of Sufficient Length To Provide Full Thread Engagement With Flange.2. Dimensions Tabulated Above Are In Inches. To Convert From in. to mm, Multiply by 25.4. nmeq means no metricequivalent.

Drill Six 7/16 in (11.11 mm)Thru Holes Equally Spaced. 

t 

AC 150/5345-42F October 17, 2006 

Figure 4. Accessories, Type L-867

D 

Drill Six 7/16 in (11.11 mm)Thru Holes Equally Spaced. 

B

D 

T 

B 

STEEL COVER PLATE EXTERIOR PLYWOOD COVER

24 
Sizes 

A

B

12 Provide

3/8 in. (9.53 mm)16 U

NC (nmeq)

12 Thru Holes EquallySpaced,For 8 in. sizeHoles are Locatedat 60°, 120°,

240° and 300°.

When Using 

Only Two

Bolts the 120° and 300°

Locations Shall be Used.

0.750 in(19.1 mm)minimum 

CBA 

Nominal Dia

meter 8 

A, Outside DiaTolerances, A 

8.500 12.500 

+0.050 +0.050

-0.000 -0.000 

B, B

olt Circle 7.250 11.250 

±0.010 ±0.010 

C, Inside Dia 6.500 10.000 

Tolerances, C +0.015 +0.015 

-0.000 -0.000 

Note: All Dimensions are shown in inches,

 t

o convert from

in. to mm multiply by 25.4

nmeq 

means no metric equivalent 

Detail "

A" 

30° 

X 

240° 

60° 

30°

120° 

300° 

Tolerances, B 

C

15 

15.500 

+0.050

-0.000

14.250

±0.010

13.000 

+0.015 

-0.000 

October 17, 2006 AC 150/5345-42F 

Figure 5. Flange, Type L-868, Class IA, Class IB 

25 
AC 150/5345-42F October 17, 2006 Flange Attached To Sidewalls A With Continuous Watertight Weld The flat surface of the flange shall be installed at 90°±0.25°to the axis of the cylindrical body. The flange surface shall be finished in accordance with ANSI B 46.1 Anchor Ring Inner Dia = A Outer Dia = A + 1.5 in (38 mm) 3/8 in (9.5 mm) Thick Sizes Welded Top and Bottom Nominal Diameter 8 12 A, Outside Dia 8.500 12.500 15.500 0.109 in. (2.77 mm) Tolerances, A +0.050 +0.050 +0.050 -0.000 -0.000 -0.000 AAA Bottom Dia 9.000 13.000 16.000 Bottom Attached To Sidewalls Tolerances, AAA ±0.100 ±0.100 With Continuous Watertight ±0.100 Note: Tabulated Dimensions are shown in inches, to convert from in. to mm multiply by 25.4. nmeq means no metric equivalent. 2-1/2 in (64 mm) Or As Specified Connections Located On X-X Or Y-Y Axis Of Flange As Required 0.109 in. specified by the airport (2.77 mm) designer (Max 2 inch) Minimum 24 in (610 mm) minimum 4 in. (100 mm) AAA Weld 

6 in. (150 mm) 

Typical 

For Size 12 and 15.

12 in.(305mm) for

Size 8 

Drain hole when specified

Size and configuration to be 

15 

Figure 6. Body, Type L-868, Class IA, Class IB 

26 
minimum

Tolerance ±1/16 in.

4. Dimensions Shown Are In Inches, To Convert Fromin. to mm, Multiply By 25.4. nmeq means no metricequivalent. 

5. Conduit Connections Aligned With Bolt Hole Axis In BottomSection. 

AAA

3/8 in BB (10 mm) CC

A outer Dia. 

To Order 

4-1/2 in. 

(114 mm) 

minimum 

Height to Order

0.750 in. (19.1 mm) 

0.109 in. min.(2.77 mm) 

Nominal Diameter 

A B C

15 12 8 

Sizes 

To O r der 3/8 in (10 mm) 

3/8 in(10 mm) 

0.109 in. min. (2.77 mm) 

0.109 in. min.(2.77 mm) 

.109 (2.77 mm) 

Bottom Section 

Middle Section 

Top Section

CC

AAA

BB

CCCC

BB

AAA 

AAA 

BB 

A, Actual Dia.

Tolerances, A 

8.500 12.500 15.500 

±0.050 ±0.050 ±0.050 

AAATolerances, AAA 

9.000 13.000 16.000 

±0.015 ±0.015 ±0.015 

BB, Bolt Circle

Tolerances, BB 

6.250 10.250 13.250 

±0.010 ±0.010 ±0.010 

A outer Dia. 

3/4 in (19 mm)X 3 in (76 mm)X 3/16 in (5 mm)steel anchorwelded tosection sideat 120 °intervals 

2 in. (51 mm) 

BBB 

4 in. (100 mm) 

Minimum 

Holes In Bottom Of Middle Section AreSlots 7/16 in (11 mm) Wide By 1-3/4 in (44 mm) Long Aligned WithBB Diameter 

A 

C

125 

125 

Drill & Tap 12

Equally Spaced Thru Holes 3/8 in

(9.53 mm) - 16 UNC

(nmeq). 

For 8 in. size

Holes are Located

On Y Axis and 

at 120° and 320°

When Using Only Two

Bolts the 120° and 320°Locations Shall be Used. 

7/8 in min. 

BBB, Bolt CircleTolerances, BBB 

7.250

±0.010 

11.250

±0.010 

14.250

±0.010 

(±1.5 mm) 

3/8 in. (9.5 mm) min. 

C, Inside Dia. 6.500 10.000 13.000

CC 5.250 9.250 12.375 

Tolerances, CC ±0.015 ±0.015 ±0.015 

NOTES:

1. Tops And Bottoms Attached To Sidewalls With Continuous Watertight Welds.2. Holes In Tops And Bottoms Shall Be Aligned.3. Supply Six 18-8 Stainless Steel Hex Head 3/8 in (9.53 mm)Fully Threaded 16UNC-2 (nmeq) Bolts, 7/8 in (22 mm) Long With EachMultiple Section

October 17, 2006 AC 150/5345-42F 

Figure 7. Sectional Body, Type L-868, Class IA, Class IB 

27 
EXTENSION SPACER RING

H, Optional H, Optional 

7/16 in.

Drill & Tap (11.1 mm) 3/8 in (9.53 mm) 6 Thru Holes16 NC (nmeq) Equally Spaced 

300° Equally Spaced

Holes are Located 

Locations

Shall be Used. 

CB

A

60° 

X

240° 

12 Thru Holes 

G, Gasket DiaTolerances, G 

6.160 10.160

±0.008 

13.160

±0.008 ±0.008 120° 

7.125

±0.005

13.160

±0.008 

240° and 300°.

When Using Only Two

Bolts the 120° and 300° 

Tolerance ±1/16 in.

C

B

AA 

E 

.1 25 

.125 

E, ChordTolerances, E 

3.625 5.625 7.125

±0.005 ±0.005 ±0.005 

X 

Sizes 

A B C C* (see note 3) Nominal Diameter 8 12 15 17.25 

A, Ext. Outside Dia 8.500 12.500 15.500 17.375Tolerances, A +0.050 +0.050 +0.050 +0.050

-0.000 -0.000 -0.000 -0.000

AA, Ext. Outside Dia 8.000 12.000 15.000 17.375

Tolerances, AA +0.050 +0.050 +0.050 +0.050

-0.000 -0.000 -0.000 -0.000 

B, Bolt Circle 7.250 11.250 14.250 14.250

Tolerances, B ±0.010 ±0.010 ±0.010 ±0.010

H, Groove Dia 6.145 10.145 13.145 13.145

Tolerances, H ±0.008 ±0.008 ±0.008 ±0.008

C, Inside Dia 6.500 10.000 13.000 13.000

Tolerances, C +0.015 +0.015 +0.015 +0.015

-0.000 -0.000 -0.000 -0.000

CC, Inside Dia 6.500 10.00 12.375 12.375

Tolerances, CC For 8 in. size ±0.015 ±0.015 ±0.015 ±0.015 

at 60°, 120°, 

NOTES:

1. Supply Six 18-8 Stainless Steel Hex Head 3/8 in. (9.53 mm) Fully

Threaded UNC 16 (nmeq) Bolts Of A Length Required For Minimum 1/2 in(13 mm) Thread Engagement In Top Flange Of L-868 ContainerWith Each Spacer Ring. For Extensions Supply Twelve BoltsMeeting The Same Requirements.2. Tabulated Dimensions Shown Above Are inches, To Convert In.to mm, Multiply by 25.4. nmeq means no metric equivalent.

3. Type C* Dimensions are Applicable for Extensions or Spacers Used to Raise Currently Installed 17 Inch Fixtures 

2 in. (51 mm) 1/16 in. (1.5 mm) Minimum

minimum 0.109 in. min.

(2.77 mm) 

0.210 in. dia. (5.33 mm) 

Height to Order

Drill 7/16 in(11.1 mm) 6 ThruHoles EquallySpaced Top and Bottom Attached to 

CC 

0.750 in. (19.1 mm) 

3/8 in. (9.5 mm) min.

.125 

.125 

Sidewalls With Continuous Watertight Weld Aligned With Holes In Top 

For Flat Spacer Ring

1/4 in. (6.35 mm) Minimum

(±1.5 mm) For Grooved Spacer Ring

"O" Ring Gasket Detail 

G 

To 1-15/16 in. (49.2 mm) 

Groove Detail 

0.165 in (4.19 mm) +0.000 in (0.00 mm) -0.005 in (0.13 mm) 

H 0.240 in (6.10 mm)

7° max 

AC 150/5345-42F October 17, 2006 

Figure 8. Extensions, Type L-868 Class IA, Class IB 

28 
Sizes TYPICAL ADAPTER RING

8" - 12" 12" - 15" A B C 

11.938" 14.938"/17.250"

Tolerances, A +0.050 +0.050 +0.050A, Outside Dia 8.000 12.000 15.000

+0.100 +0.100

-0.000 -0.000 -0.000 -0.000 -0.000 

AA, Outside Dia 9.938"Tolerances, AA +0.000

Drill Six 7/16 in (11.11 mm) Drill Six 7/16 in (11.11 mm) -0.030 

Thru Holes Equally Spaced. Thru Holes Equally Spaced. AAA, Outside Dia 8.375 12.375 15.375 Counterbore Each Hole Counterbore Each Hole Tolerances, AAA +0.050 +0.050 +0.050 1-1/8 X 1/4 in. 1-1/8 X 1/4 in. -0.000 -0.000 -0.000 

(28.58 X 6.35 mm). (28.58 X 6.35 mm). No Holes On X-X No Holes On X-X B, Bolt Circle Dia 7.250 11.250 14.250 11.250" 14.250"

Axis Of 8 in. Axis Of 8 in. Tolerances, B ±0.010 ±0.010 ±0.010 ±0.010 ±0.010 (254 mm) Size. (203 mm) Size. BB, Bolt Circle Dia 6.250 10.250 13.250 7.250" 11.250"

X ±0.010 ±0.010 X X X Tolerances, BB ±0.010 ±0.010 ±0.010

C, Inside Dia 6.500 10.000 13.000 8.125"* 12.250"*

Coat Edge & 1 in. (25 mm) Tolerances, C +0.015 +0.015 +0.015 +0.015 +0.015 Minimum Each Side With -0.000 -0.000 -0.000 -0.000 -0.000 Paraffin CC, Inside Dia 6.500" 10.000"

Fabricate from Exterior Grade Tolerances, CC +0.015 +0.015

Plywood, BB/CC, or other material -0.000 -0.000 See Note 3 of Equal Strength and Weather T, Thickness (steel) .750 .750 1.250 1.250" 1.250" B B Resistance t, Thickness (plywood) 3/4 w/o 3/4 w/o 1-1/4 

Mud Plate Mud Plate A AAA 5/8 w/ 5/8 w/ 

Mud Plate Mud Plate 

T t NOTES:

1. Supply Six 18-8 Stainless Steel Hex Head 3/8 in (9.53 mm) Fully Threaded 

 16 UNC (nmeq) Bolts Of A Length Required For Minimum 1/2 in (13 mm) Thread Engagement In The Top Flange Of A Type L-868

2. Dimensions Tabulated Above Are In inches, To Convert From in. to mm STEEL COVER PLATE EXTERIOR PLYWOOD COVER Multiply By 25.4 nmeq means no metric equivalent

3. Steel Cover Plate Bolt Circle "B" May be "BB" Dimension if Required.

Drill & Tap3/8 in. (9.53 mm) 4. * C Dimensions apply Only to Adapter Rings.16 UNC (nmeq)6 Thru Holes Equally Drill 6 Thru Holes Drill 6 Thru HolesSpaced, Tap after 7/16 (11.1 mm) Dia Drill & Tap 12 7/16 in (11.1 mm)Galvanizing Equally Spaced With Thru Holes Dia Equally Spaced 

Drill & Tap 4 Thru Holes Drill 6 Thru Holes 1 1/8 in (28.6 mm), 3/8 in (9.53 mm) Y

3/8 in (9.53 mm) 16 UNC 7/16 (11.1 mm) Dia 5/16 in (8 mm) Deep 16 UNC (nmeq) 

(nmeq) Equally Spaced Equally Spaced With Counterbore Equally Spaced 

1 1/8 in (28.6 mm),1/2 in (12.7 mm) Deep 2-1/4 in (57 mm) Apart Counterbore Centered On X X Axis

Ø 1-1/8 in (28.5 mm) Either

Side Of Y Y Axis B X BB X BB B 

Inner Ring O.D. 4.25 in (108 mm)Middle Ring O.D. 5.75 in (146 mm) 2 Knockouts Drill 6 Thru Holes Outer Ring O.D. 7.25 in (184 mm) 1 in (25 mm) 7/16 in (11.11 mm) Dia Rings Are 1/4 in (6 mm) Wide With 5/8 in (15.88 mm) and Raised 1/32 in (0.8 mm) Counterbore Azimuth Minimum Dia Correction Holes Y 

A Ø To Order 

A AAA A T B T C C B or BB C Center Point Indented 

Thickness To Order1/2 in (13 mm) CC 1/8 in (3 mm) CC Minimum AA 

12" - 15" 8" - 12" 

REMEDIAL SPACER RING TYPICAL ADAPTER RINGS MUD COVER 

October 17, 2006 AC 150/5345-42F 

Figure 9. Accessories, Type L-868 

29 
AC 150/5345-42F October 17, 2006 

Intentionally left blank. 

30 
APPENDIX 

EXTENSION SPACER RING Nominal Diameter 10 inch

A, Outside Dia 10.500 Tolerances, A +0.050

-0.000

CB

AA 

E 

12 . 5 

.125 

H, Groove Dia 8.145

X C, Inside Dia 8.000

Drill & Tap3/8 in (9.53 mm)16 NC (nmeq)Equally SpacedTap aftergalvinizing

Size 

7/16 in.(11.1 mm)6 Thru HolesEqually Spaced 

C

B

A

B, Bolt CircleTolerances, B

Tolerances, C 

9.250

±0.005

+0.015

-0.000 

Y 

X 

Y 

12 Thru Holes

No Holes OnX-X Or Y-YAxis On10 in. (254 mm)

H, Optional H, Optional 

Tolerances, H ±0.008 

AA, Outside Dia Tolerances, AA 

10.000

+0.050 

-0.000 

minimum

Drill 7/16 in(11.1 mm) 6 Thru C

0.109 in. min.

3/8 in. (9.5 mm) min. 

12 . 5 

.125 

1-15/16 in. (49.2 mm) 

E, Chord 4.625Tolerances, E ±0.005 G, Gasket Dia 8.160Tolerances, G ±0.008 

NOTES:

1. Supply Six 18-8 Stainless Steel Hex Head

3/8 in. (9.53 mm) UNC 16 (nmeq) Bolts Of A

Length Required For Minimum 1/2 in (13 mm)

Thread Engagement In Top Flange Of L-868 

Container With Each Spacer Ring. For

Extensions Supply Twelve Bolts Meeting The 

0.750 in. (19.1 mm) Same Requirements.

Height to Order

2 in. (51 mm)

2. Tabulated Dimensions Shown Above Are 1/16 in. (1.5 mm) Minimum inches, To Convert In. to mm, Multiply by 25.4. For Flat Spacer Ring

1/4 in. (6.35 mm) Minimum nmeq means no metric equivalent. Tolerance ±1/16 in. (2.77 mm) (±1.5 mm) For Grooved Spacer Ring To

Holes EquallySpaced Top and Bottom Attached to 0.210

Aligned With Holes In Top Sidewalls With Continuous Watertight (5.33 mm) Weld 

Extensions and spacers for 10 inch Diameter type

+0.000 in (0.00 mm) 0.210 G -0.005 in (0.13 mm) L-868 base. (5.33 mm) 

0.165 in (4.19 mm) 

H 0.240 in (6.10 mm)

7° max 

Extensions are for use on existing bases only to provide height adjustments when changes in pavement 

level occur. 

"O" Ring Gasket Detail Groove Detail 

October 17, 2006 AC 150/5345-42F 

Figure A-1. Extensions and Spacers for 10-inch (254 mm) Diameter Type L-868 Base, for 

Maintenance of Existing Installations Only 

A-1 
AC 150/5345-42F October 17, 2006 

Intentionally left blank. 

A-2