Fig. 1: L-867 / L-868
Airport Light Bases
and Transformer
Housings
Compliance with Standards
FAA: In compliance with FAA L-867 or L-868 specification AC
150/5345-42B, and with FAA E-1315 specification.
Moreover bases can be developed or adapted to accomodate
non-FAA semi-flush lights and also to meet particular installation
requirements.
Fig. 2
Uses
- Installation of elevated lights (Fig. 7). The base houses the isolating
transformer and its connectors.
- Installation of semi-flush lights (Fig. 10). The base may also house the
isolating transformer and its connectors.
- As an underground housing for one or more isolating
transformers (Fig. 8-9).
- As a cable pulling box or test link box.
Table A - Types and Sizes Available
Place where
lnstalled
NOT subject
to aircraft or
surface
vehicle loads
FAA
Spec.
L-867
Type
Size
B(12")
D 16
Subject to
L-868
aircraft or
surface vehicle
loads
A (10")
B (12")
C (15")
E-1315
LB-1
LB-4
LB-4
16"
Uses
Mounting of elevated lights on
base plates (Fig. 7)*
Installation of some types of
semi-flush lights
(e.g. edge lights)*
Installation of L-852 type III
semi-flush lights*
Installation of semi-flush lights
L-852 and VSF/1 VCF/1 type IV, L-850A and B
(Fig. 10)*
VCF/1 type IV, L-850A and B
(Fig. 10)*
lnstallation of semi-flush lights
L-850C, D and E*
lnstallation of semi-flush lights
E-2491 (Fig. 14)
A lnstallation of semi-flush
lights -850C, D and E
* Transformer housing (Fig. 8-9)
Cable pulling box
Test link pits
A.05.120e
Features
• Steel bases constitute a safe and proven method for anchoring semi
flush lighting fixtures into paved surfaces. Although other systems do
exist, they rely on the pouring in situ of quick setting concrete which
supports the lights and place heavy reliance upon the skill of the
contractor and the quality of the concrete mixing.
• Metal bases are self supporting and have the characteristics to bear
by themselves, and transfer the loads of the heaviest aircraft without
Notes
1. Grommets (Figure 19) are located on
XX’axis, except if otherwise required.
2. Upon request grounding lug
entailing stress concentrations into concrete and ground. Steel equally
resists compression, traction, bending moments and shear. All these are
(External,Internal or both).
stresses actually generated by the dynamic loads of landing and rolling
aircraft.
• The bases are factory made to a very demanding specification, fully
tested and certified prior to shipment. Thousands of these steel bases
have now been in satisfactory use around the world for many years.
• Universal mounting system for installation of elevated and semi-flush
lighting fixtures.
Fig. 3: BASE FAA L-867
Table B - Bases FAA L-867
Size
B
D
A
314
413
Dimensions (mm)
B
C
260
203
362
314
D
343
441
• Hot dip galvanization effectively protects base against corrosion.
• PCP grommets (ADB patented design) ensure watertight conduit
entrances.
-easy installation (no need to thread the conduit)
-will accept any kind of conduit: steel, PVC, PET, asbestos-cement,
GRP, ...
-fits tightly around conduit while allowing for free expansion and
contraction of conduit
Notes
1. Grommets are located on XX’axis, except if
otherwise required.
2. Anchor ring not included when base is
installed in non-load bearing surfaces or
in a concrete block independent from
pavement slab
3. Upon request grounding lug
(external, internal or both)
-compensates for slight angular offset of conduit in all directions
(Fig. 19).
• Rings and extensions allow for raising the lighting fixture after pavement
overlays.
• When used as a transformer housing:
-the base will keep transformer and connectors in clean conditions
- the lightweight steel cover facilitates speedy inspection and trouble
shooting operations
-the base is technically superior and cheaper compared to concrete or
brick pits with heavy covers.
-the base being metallic forms an integral part of the electrical
counterpoise (earthing) system.
Fig. 4: BASE FAA L-868, IN ONE PIECE
Table C - Bases FAA L-868
Size
A
B
C
Dimensions (mm)
A
A’
B
254 263 235
305 318
286
381 394 362
C
203
254
330
Note 6
D
E
292 152
343 235
419 314
F
264
314
391
G
210
260
337
G’
235
286
362
• The ADB technical department will assist Designers and Contractors to
solve any specific problem.
Construction
The bases are fabricated from A36 grade steel. After cutting, bending
and machining, the parts are arc-weld assembled. A steel lug for ground
connector is welded outside for E-1315 (LB-1, LB-4 and LB-4A) bases and
on request inside, outside or both for L-867, L-868 and special models.
A temporary plywood cover provides protection during transportation and
erection.
Quantity, location and diameter of conduit entrances must be specified with
order. Top gasket and screws are not part of the base and must be ordered
separately. They are generally supplied with the lighting fixture, with the
cover or with the flange rings.
For outline dimensions and details refer to:
Fig. 3 - Base L-867
Fig. 4 - Base L-868 in one piece
Fig. 5 - Base L-868 in multiple sections
Fig. 6 - Base E- 1315 types LB-1, LB-4 and LB-4A
Fig. 16 - Covers
Fig. 19 - Grommets.
a.Top section
b.Middle section
c.Bottom section
6x3/8” - 16 UNC @ 60° (standard).
12x3/8” - 16 UNC @ 30° (on request).
no holes on XX’ axis for size A base
(see figure 4).
Fig. 5: BASE FAA L-868, MULTIPLE SECTION
Notes
1. 20 x5mm steel anchor welded to section side at 120° intervals
2. To order: 115 mm minimum
3. To order: 51 mm minimum
4. Upon request grounding lug in top section (external, internal or both).
5. Grommets are in line with two opposite bolt holes.
6. A and G must be used for top section. A’ and G’ must be used for extensions
installed on top section after overlay.
7. Slotted holes 12 mm wide by 35 mm long.
Finish
- Base and extensions: hot dip galvanized
- Rings: zinc or cadmium plated and chromated.
Installation
General
ADB proposes a twenty minute video movie (VHS, Betamax/PAL, Secam,
NTSC) covering bases installation. This tape details the successive steps to
be carried out by the contractor, on site, to install bases;
- In rigid cement concrete pavement.
- In flexible asphalt pavement.
- In shoulders.
- Using the glue-in method (for L-850 shallow bases).
A copy may be obtained from the ADB technical department.
Specify: Video Standard: VHS or Betamax
Color System: PAL, SECAM or NTSC.
L-867 Bases
After levelling, aiming and bonding to an external counterpoise wire,
if specified, the base is encased in concrete poured in situ. Minimum
recommended thickness of concrete is 10cm all around base. See Fig. 7.
Fig. 6: BASES FAA E-1315 types LB-1 /LB-4/LB-4A
Alternatively the base may be supported on a concrete slab cast in advance
Table D - Bases Types LB-1, LB-4 AND LB-4A
at the bottom of the excavation. The soil material is then tightly compacted
Type
LB-1
LB-4
LB-4A
Dimensions (mm)
A
B
413
362
413
362
413
362
all around the base. A concrete slab is cast on the top to provide adequate
C
314
314
314
D
441
441
441
H
508
711
711
Notes
1. Base LB-1 and LB-4A: 6 tapped holes 3/8” - 16 UNC 2 Base LB-4:
6 holes 11 mm dia.
2. Grommets (Fig. 19) are located on XX’axis, except if otherwise required.
3. Fitted with external grounding lug. Optional internal lug on request
finish and good stability. See Fig. 8 and 9.
L-868 Bases
General
Since they shall have to bear and transmit considerable loads these bases
shall always be installed in concrete structures of appropriate sizes. lf it is
found necessary to reinforce the concrete, the steel reinforcement cage
may be welded to the base. See Fig.11 and 12 (not supplied by ADB).
A. Installation in rigid, cement concrete pavement This method applies to
runway centre line, (Fig. 10) touchdown zone, high speed turn off lights etc.
One piece bases shall be used (Fig. 4). The bases must be «integrated»
into the paved surface , therefore they will be positioned together with the
conduit system prior to paving operations.
This technique is known as «Monolithic base and conduit system» and is
summarized on Fig. 11.
Monolithic base and conduit system (Fig. 11)
The main steps of «monolithic» base and conduit installation in rigid cement
concrete pavement.
Step 1: Dig into gravel undercourse for base and conduits. Locate base into
final position and level it. Hold in place, using appropriate jigs. «A»: 38mm
below level of finished typical pavement.
Step 2: Pour concrete around base and conduits. Install temporary spacer
ring or plywood cover and eventually mud plate.
Step 3: Proceed with runway paving.
Step 4: Remove mud plate and temporary spacer ring or plywood cover.
Install final spacer ring and flange ring. Top of flange ring to be 19mm (3/4”)
below pavement level. Use appropriate spacer ring to compensate possible
variations in level.
Step 5: Install lighting fixture on flange ring fitted with «O» ring gasket. lnsert
A = Minimum 10 cm (4”)
Fig 7 ELEVATED RUNWAY EDGE LIGHT - TYPICAL INSTALLATION
Fig. 7
screws and tighten at specified torque.
CONSTRUCTION
1. Base L-867
2. Plain cover with gasket
3. Asphalted shoulder
4. Runway pavement
5. Conduit elbow
6. Compacted elbow
7. Concrete
Alternative installation method. Transformer base outside paved shoulder
Fig. 8
CONSTRUCTION
1. Base L-867
2. Plain cover with gasket
3. Asphalted shoulder
4. Resin filter
5. Runway pavement
6. Compacted material
7. Concrete
8. Resin sealant
Touchdown zone lighting barette. Typical installation of inset lights on shallow
(L-800) bases. Transformer base in paved shoulder
Fig. 9
INSTALLATION OF SQ2100 SEMI-FLUSH LIGHT
ON FAA L-868 BASE (runway centre line)
(Isolating transformer type RCE with earthing terminal)
CONSTRUCTION
1. Base L-868, one section
2. shielded AFL cable
3. Grounding wire
4. Isolating transformer type RCE
5. Earthing lug
6. Runway slab (concrete)
7. Subgrade
Fig. 10
One-pice based «monolithic» installation
(cement concrete pavement)
Fig. 11
B. Installation in flexible, asphalt pavements
This technique is similar to the one described hereabove, yet it requires a
multiple section base since the paving is executed in several layers.
See Fig. 5. The height of the different sections is defined by the thickness
of the successive layers. Fig. 13 gives a short description of this method
of installation. Spacer rings and flange rings should also be used. They are
identical to those used with the one-piece bases.
Existing Runways
A technique similar to that described in Fig. 13 is applicable to the
installation of semi-flush lights in existing runways that have to be
resurfaced. Please contact ADB for more details.
C. Installation in paved areas not subject to aircraft and vehicle traffic
This applies mainly to threshold lights, runway end lights and to semi-flush
Fig. 12: «monolithic» installation under way (step 2 partly completed)
approach lights installed in overrun areas. Thickness of these pavements is
The bases are in one piece as per Fig. 4.They must be completed with spacer
rings, a flange ring and sometimes with a remedial spacer ring if the base has been
wrongly oriented. See Fig. 17.
generally small, hence the base shall be encased in a concrete block cast
in-situ. A simplified L-868 base, without anchor ring shall be used in this
case (See Fig. 4, note 2).
The concrete block may be common to several lights forming a barrette. lf
particular circumstances preclude the digging of deep holes in these areas,
the lights may be installed on shallow depth bases (90 to 150mm) sealed by
means of resin into cored-out recesses.
Fig. 14 shows an H.l. approach light type ATF-1 -350 installed on a base
150mm deep.
Bases LB-1, LB-4 AND LB-4A
Theses bases are installed in the same way as L-867bases. See figure 15.
Main steps of base and conduit installation in asphalt
concrete (flexible) pavement.
Standard procedure (Fig. 13)
Step 1 Dig into gravel undercourse for base and conduits. Locate bottom
section of base into final position and level it. Hold in place, using
appropriate jigs.
Step 2 Install mud plate fitted with target rings. Pour concrete around
base and conduits up to original undercourse level.
Step 3 Lay base course.
Step 4 Core out 3” or 4” pilot hole and observe target. Measure depth
«D» and order middle section of proper height
Step 5 Core out at diameter slightly larger than O.D. of middle section,
including anchor blades.
Step 6 Remove core and mud plate. Install middle section. Seal around
with resin. Reinstall mud plate on top of middle section
Step 7 Lay filler course and top (wearing) course.
Step 8 Repeat steps 4 and 5.
Step 9 Remove core and mud plate. Bolt top section to middle section.
Seal around with resin, up to top flange.
Step 10 Install spacer and flange rings, plywood cover. Install lighting
fixture on flange ring equipped with «O» ring gasket. Tighten
screws at specified torque.
Multiple section base installation (flexible pavement)
Fig. 13
Accelerated procedure (Fig. 13)
An alternative procedure can be carried out according to the drilling
equipment available on site.
Steps 1, 2 and 3 are achieved as described in the standard procedure.
Step 4 Lay successively the different courses (filler and wearing courses).
Step 5 Core out 3” or 4” pilot hole and observe target (Fig. 13 - 11).
Measure depth «D» and order top section of proper height.
Step 6 Core out at 13” DIA.
Step 7 Remove core and mud plate, install top section, Bolt top section
to bottom section. Seal around with resin, up to top of flange ring.
(Fig. 13 - 12)
Step 8 Refer to step 10 of the standard procedure.
Installation of ATF-1 -350 Light on shallow depth base 16” DIA.
A minimum 900mm diameter and 600mm depth concrete foundation is required.
Fig. 14
Existing pavement
Follow the same method when lights are to be installed in an overlay to
an existing pavement In this case step 1 applies to existing pavement and
steps 6, 7 and 8 may be omitted if top section is installed directly on bottom
section as will be the case generally.
Construction
1. L-868 base
2. Conduit
3. Mud plate (optional)
4. Temporary spacer ring (or plywood cover)
5. Flange ring
6. Spacer ring
7. Lighting fixture
8. «O» ring gasket
9. Screw (variable length)
10. Optional steel reinforcement cage.
Notes
1. Diagrammatic only. Not intended to show actual installation details of dimensions.
2. The galvanization of the cone is effective only if the PH of the concrete is comprised
between 6 and 12.5.
Accessories
Plain Covers (Fig. 16 a)
For closing all bases listed in table A, except LB-4.
Finish: hot dip galvanized.
A pressed steel cover is available for L-867 size B base.
See Fig. 16 b.
Finish: aviation yellow. Covers are supplied with mounting screws and
gasket. Gasket is as per Fig. 16 (d) for L-867 and LB-1 bases.
An «O» ring gasket is supplied with covers intended for installation on L-868
bases.
Base Plates (Fig. 16 c and catalogue leaflet A.05.110.)
For mounting an elevated light on L-867 base.
Typical application: Fig. 7.
Made from pressed steel.
Finish: aviation yellow.
Supplied with gasket, as per Fig. 16(d), mounting screws and clamp for
secondary receptacle of isolating transformer.
Installation of an in-pavement DCF-1-120
Light on a LB-4 base
Fig. 15
CONSTRUCTION
1. LB-4 base
2. Screw lighting fixture
3. Lighting fixture
4. Outer ring
5. Resin filter
6. Screw mounting ring
7. External grounding lug
(standard) may be
internal on request
Rings (Figure 17)
Used with L-868 bases, they mount between the base top flange and the
lighting fixture.
Flange rings (Fig. 17 b) have a machined groove for the «O» ring gasket.
Spacer rings (Fig. 17 c) allow for mounting lighting fixture at correct level.
Finish: zinc or cadmium plated and chromated.
Dimensions: see figure 17 and table F below.
Table E - Refer to Figure 16a
For base type
Dimensions (mm)
L-867
Size
A
B
C
T
B
343
260
203
10
16”
441
362
314
30**
A
254
235*
203
20**
B
305
286
254
20**
C
381
362
330
32**
D
LB-1
LB-4A
L-868
Fig. 6: BASES FAA E-1315 types LB-1 /LB-4/LB-4A
*Only 4 holes: no holes on XX’axis.
**Minimum thickness to resist wheel loads.
Table F - Rings (Figure 17)
a. HEAVY PLAIN COVER: see table E
b. LIGHT PLAIN COVER, 12” dia
c. BASE PLATE 12” dia
d. GASKET
Fig. 16
Size
A
B
C
A
254
305
381
B
235
286
362
Dimensions (mm)
C
H
203
207
254
258
330
334
T
Specify
with
Order*
*Flange ring: min 7 mm, max 19 mm. (standard)
Spacer ring: standard sizes l,5 - 3 - 6 - 10 - 15 - 20mm
Conduit Caps (Figure 18)
To be installed on threaded steel conduit ends.
Typical application: figure 8.
Equipped with one or more compression glands («Squeeze connector»).
See table G below.
Material: malleable iron.
Finish: bituminous black paint.
Table G - Conduit Caps
Cap size
2” gas
CONSTRUCTION
1. Lighting fixture
2. <<O>> ring gasker
3. Flange ring
4. Space ring (if any)
5. L-868 base
Fig. 17
3” gas
4” gas
Qty and size of
compression glands
2 x PG 13,5
or 2 x PG 16
or 1 x PG 21
4 x PG 13,5
Outer dia.
of cable (mm)
min.
max.
10
12
12
14
14
17
10
12
or 4 x PG 16
or 3 x PG 21
12
14
14
17
6 x PG 13,5
or 6 x PG 16
or 4 x PG 21
10
12
14
12
14
17
Grommets (Figure 19)
The grommet compensates for angular offsets of conduits (Fig. 19b and
c) and ensures freedom of conduit under the effects of expansion or soil
movement, while ensuring a watertight conduit connection.
Material: polychloroprene (PCP)
Conduit O.D. should be within tolerances indicated in Table H to ensure
proper fit.
Special executions - optional extras
Note:
Special executions and extras always entail a price variation and should be
covered by a specific price quotation from ADB.
Concreting Collar
See figure 20, item A. Not for L-868 bases.
- Improves finish and workmanship of installation
- Avoids breakage of concrete around lighting fixture.
Fig. 2 shows type L-867 bases fitted with concreting collar.
Location: threshold.
Internal Grounding Lug
Useful for earthing of screen of shielded cables and/or ground terminal of
isolating transformer type RCE (Fig. 10)
Conduit Entrances (See figure 20.)
Fig. 18: Cap Iinstalled On 3”Steel conduit (note earrthing screw)
- Unthreaded steel hubs - item B.
- Tapped steel hubs 2” or 3” gas (11 TPI) - item C
- Number, diameter and location different from that of standard model.
Drain Hole (See figure 20, item D.)
3/4” drain hole and 3/4” gas, 11 TPI half coupling in bottom centre of base.
Height
Upon request bases of smaller or larger height can be manufactured.
Table H - Grommets
Conduit size
2” galv. steel
2” PVC
3” galv steel
1 1/2” PVC
Dimensions (mm)
Fig. 19 (a)
conduit O.D.
60,3 ± 0,6 mm
63 ± 0,6 mm
89 ± 0,9 mm
50 ± 0,6 mm
FOR DIMENSIONS
SEE TABLE H
Fig. 19: GROMMETS
A
70
70
99
60
B
60
62,5
89
49,7
CONSTRUCTION
A. Concreting collar
B. Unthreaded hub
C. Tapped hub 2” or 3” gas - 11 TPI
D. 3/4” gas - 11 TPI half coupling (drain)
Fig. 20: SPECIAL ECECUTIONS OPTIONAL EXTRAS
Table I - Net Weights and Volumes
Base type
Height
mm
Net weight
kg
Volume
m3
LB-1
B
D
A
B
C
16”
610
610
610
610
610
508
23,5
30,3
16,7
28,5
34,4
28,1
LB-4/LB-4A
16”
711
33,1
L-867
L-868
Size
0,074
0,122
0,035
0,071
0,094
0,102
Standard pallet*
Qty
per pallet
27
12
27
27
12
12
Weight per
per kg
685
405
495
820
450
375
Volume per
pallet m3
2,35
1,82
1,76
2,35
1,65
1,70
0,142
12
435
2,07
For information purpose only.
Note:
Packing method: -On pallets except if mentioned
otherwise in quotation.
-Accessories in boxes or on pallets.
Suggested Specification
Warranty
A temporary plywood cover shall be provided to protect the top flange
ADB undertake to remedy any defect resulting from faulty materials or
during transportation and erection. The bases equipped with the
workmanship appearing during a period of one year after date of shipment
appropriate type, quantity and positon of duct entrance(s) and with one
exclusive of any defect developing as a result of improper use or handling.
external, internal or both earthing terminal. The spacer and flange rings
Repairs and / or replacements will take place in our factory. Such correction
accurately machined shall be zinc or cadmium plated and chromated. They
shall constitute the limit of our liabilities with respect to equipment. Drawings
shall include stainless mounting screws and O-ring gaskets to ensure the
and sketches are typical and diagrammatic only and are not intended to
watertightness of the assembly. The base cover shall be made from hot dip
show actual manufacturing and installation details, or dimensions
galvanized machined steel or fom zinc coated and vellow painted pressed
The Airport Light Bases and Transformer Housing shall be constructed to
meet the requirements of FAA specifications, L-867, L-868 (AC150/534542B) or E1315. They shall be fabricated from A36 grade steel, protected by
hot dip galvanization.
steel. These base covers shall be supplied with stainless steel mounting
Ordering Information
One-piece bases
- Base type L-867, L-868, LB-1 , LB-4 or LB-4A
- Nominal sizes: A (10”), B (12”), C (15”) or D (16”)
- Nominal depth: 400,500 or 610mm
- Number, diameter, type and location of conduit entrances. For bases
designed to accommodate semi-flush lights the location(s) should be
given with respect to the light beam axis (disregard beam toe-in or
toe-out angle if any).
- Special execution or optional extras (see Fig. 20).
Multiple Section bases - Rings
This installation method will generally necessitate a technical study made
jointly by the Contractor and ADB. This study shall define all details of the
bases and their accessories.
screws and with a flat rubber gasket or an O-ring seal.
Notes
Registered Office:
Phone: +32 (2) 7221711
Fax: +32 (2) 7221764
info.adb@adb-air.com
www.adb-air.com
© ADB
all rights reserved
order number DOCA05120V2
subject to modifications
www.comith.be
ADB
Airfield Solutions
Leuvensesteenweg 585
B-1930 Zaventem
Belgium