Installation of Inset and Elevated Fittings
Housing of Isolating Transformers
FAA Type Deep Bases
The FAA type deep bases are used to :
- Make ground fixing of Elevated or Inset fittings (with or without housing
of the corresponding isolating transformer). See Fig 1 and Fig 2
- Make underground housing of Isolating Transformer(s). See Fig 3
- Make underground housing cables Junction(s). See Fig 4
DOC 1403.E
Revision 1.0
01/12/02
Utilisation
. Isolating Transformers
Housing and Ground
Fixing of :
- Inset Fittings
- Elevated Fittings
. Underground Isolating
Transformers or Junctions
Housing
Compliance with
standards
. FAA : AC 150/5345-42C
L-867, L-868 and
E-1315 LB-1, LB-4, LB-4A
Depending on the characteristics of the installation, type of fittings to support
(elevated or inset), Location on the field (withstand or not aircraft or vehicle
loads) and type of pavement (cement concrete or flexible), these deep bases are
available in four types : FAA L-867, one piece FAA L-868, Multiple sections FAA
L-868 and FAA LB
All these FAA type deep bases are made of hot galvanised steel. Their bolt, nuts
and fixing elements are stainless steel. They can be equipped with grounding
lugs upon request
A special Jig allows each base to be level, oriented correctly and maintain in its
final position during installation.
FAA Type Deep Bases
Accessories for FAA types Deep Bases
Spacer Rings
These rings allow the base installation to be adjusted. They are installed between the base top flange and the light fitting or other
accessory. All available types of spacer accessories are the following :
Flat Spacer Rings : used to provide height adjustment for L-867 and L-868 type bases. Thickness from 1/6” (1.6 mm) to 115/16” (49 mm).
Grooved Spacer Rings : Comprise of an O ring gasket used to provide a more watertight seal with an inset fitting. Thickness
from 1/4” (6.4 mm) to 1-15/16” (49 mm).
Tapered Spacer Rings : Is use to provide a level and/or height correction for L-868 type bases. Greatest thickness at a maximum
of 3/4” (19 mm) and thickness at a minimum of 1/4” (6.4 mm).
Azimuth Correction Rings : Used to correct the base alignment Standard thickness of 3/4” (19 mm).
Extensions
They are used to provide adjustments when exceeding the Spacer Ring depth. Minimum depth of 2” (51 mm).
Plates and Plain Covers
Cover Plate : Provides a cover to bases when used without light fitting top.
Mud Plate : Is used with plywood covers to protect the base flange during installation and to facilitate easy location after
installation.
Plywood cover and shipping gasket : Are used to protect bases during shipping and installation.
FAA L-867 Type Deep Base
Utilisation
These bases are used to install mainly elevated fittings but also inset fittings which do not withstand
aircraft or vehicle loads (Non Load Bearing).
Design
1) Flange attached to side-walls with continuous watertight weld
2) Holes (x 6) equally spaced, 3/8” – 16 UNC tapped after galvanisation
Conduit connection (two type of connections are available) :
4) Neoprene grommet
5) Tapped 2” NPT
Options (only on request) :
6) Grounding lugs Internal, external or both
7) Drainage Hole
Dimensions
Nominal
Diameter
Size B (=12” = 254 mm)
Size D (=16” = 406 mm)
Diameter in mm
A
B
C
D
343 260 203 314
441 362 314 413
FAA LB Type Deep Base
Utilisation
These bases are used to install inset fittings which do not withstand aircraft or vehicle loads (Non load
bearing)
Design
1) Flange attached to side-walls with continuous watertight weld
2) Holes
- For LB-1 and LB-4A : Six holes equally spaced, 3/8” – 16 UNC tapped after galvanisation.
- For LB-4 : Six holes equally spaced with diameter = 11 mm
Conduit connection (two type of connections are available) :
4) Neoprene grommet
5) Tapped 2” NPT
Options (only on request) :
6) Grounding lugs Internal, external or both
Dimensions
Type
LB-1 (H = 254 mm)
LB-4 (H = 711 mm)
LB-4A (H = 711 mm)
©Thorn Airfield Lighting
Version 1.0 (01 December 2002)
Diameter in mm
A
B
C
D
411 362 314 413
411 362 314 413
411 362 314 413
Page 2 / 4
FAA Type Deep Bases
Doc 1403.E
FAA Type Deep Bases
FAA L-868 Type Deep Bases
One Piece FAA L-868 Type Deep Base
Utilisation
These bases are used to install in rigid cement concrete pavements inset fittings which do withstand
aircraft or vehicle loads (Load Bearing).
Design
1) Flange attached to side-walls with continuous watertight weld
2) Holes (x 12) equally spaced, 3/8” – 16 UNC tapped after galvanisation
3) Anchor ring
Conduit connection (two type of connections are available) :
4) Neoprene grommet
5) Tapped 2” NPT
Options (only on request) :
6) Grounding lugs Internal, external or both
7) Drainage Hole
Dimensions
Nominal
Diameter
Size A (=10” = 254 mm)
Size B (=12” = 305 mm)
Size C (=15” = 381 mm)
Diameter in
A
B
C
254 235 203
305 286 254
381 362 330
mm
E
F
292 264
343 314
419 391
Multiple Sections FAA L-868 Type Deep Base
Utilisation
These bases are used to install in flexible asphalt pavements inset fittings which do withstand aircraft or
vehicle loads (Load Bearing).
Depending of their position inside the pavement, three different types of sections must be used : Top
sections (see Fig 5), middle sections (see Fig 6) and bottom sections (see Fig 7).
The height of each section can be adapted to the need of the customer (These heights have to be
specified in its order).
Nevertheless a minimum height exist for each section :
- Top Section (H1) minimum height = 51 mm
- Middle Section (H2) minimum height = 151 mm
- Middle Section (H3) minimum height = 151 mm
Design
1) Flange attached to side-walls with continuous watertight weld
2) Holes
2) Top of top section :
- Twelve holes equally spaced, 3/8” – 16 UNC tapped after galvanisation
2’) Bottom of top section, top of the middle section and top of the bottom Section :
- Six holes equally spaced with diameter = 12 mm
2’’) Bottom of middle section :
- Six slots aligned on the top holes 12 x 35 mm
3) Three Anchor bars welded to middle section, spaced of 120°
Conduit connection on bottom section (two type of connections are available) :
4) Neoprene grommet
5) Tapped 2” NPT
Options (only on request) : Grounding lugs on top section internal, external or both
Dimensions
Nominal
Diameter
Size A (=10” = 254 mm)
Size B (=12” = 305 mm)
Size C (=15” = 381 mm)
©Thorn Airfield Lighting
Version 1.0 (01 December 2002)
Diameter in
A
B
C
254 235 203
305 286 254
381 362 330
mm
F
G
I
264 210 152
314 260 235
391 337 314
Page 3 / 4
FAA Type Deep Bases
Doc 1403.E
FAA Type Deep Bases
Ordering Code
Type of Deep Base : L-867, L-868, LB-1, LB-4 or LB-4A
Nominal Diameter of the Base : A (10“ = 254 mm), B (12“ = 305 mm),
C (15“ = 381 mm), D (16“ = 410 mm)
Depth of the Base (For L-868 multiple sections base)
Cables Outlets :
Type : Neoprene grommet or tapped 2” NPT
Number of outlets
Locations of the outlets
Drainage Holes (Not supplied on standard bases)
Grounding Lug (Not supplied on standard bases) : Internal, External or Both
Accessories :
Type of accessories : Spacer Rings, Extensions, Plates and Covers
Type of the corresponding base
Nominal Diameter of the corresponding base
Requested thickness (if necessary)
Cardboard packing data
Data concerning packing of FAA type deep bases are specific to each delivery and only
be supplied after a complete study of the corresponding installation project.
Nevertheless find the following information on standards Deep bases.
Thorn Airfield Lighting France
156 boulevard Haussmann
75379 Paris Cedex 08
FRANCE
Tel : +33 (0) 1 49 53 62 62
Fax : +33 (0) 1 49 53 62 89
info@ThornAirfieldLighting.fr
Thorn Airfield Lighting Pty Ltd
7-9 Newcastle Road
Bayswater Victoria 3153
AUSTRALIA
Tel : +61 (0) 3 97 20 32 33
Fax : +61 (0) 3 97 20 82 33
info@ThornAirfieldLighting.com
Thorn Airfield Lighting UK Ltd
11 Town Quay Wharf, Abbey Road,
Barking, Essex, IG117BZ
UNITED KINGDOM
Tel : +44 (0) 208 594 2747
Fax : +44 (0) 208 594 2848
info@ThornAirfieldLighting.co.uk
Designation
Volume
in m3
Dimensions
in mm
Weight
in kg
L-867 size B
0.073
610 x 345 x 345
25
L-867 size D
0.120
610 x 445 x 445
32
L-868 One piece size A
0.042
610 x 260 x 260
18
L-868 One piece size B
0.060
610 x 310 x 310
30
L-868 One piece size C
0.095
610 x 390 x 390
37
L-B-1
0.044
254 x 415 x 415
30
L-B4 and LB-4A
0.125
711 x 415 x 415
35
Specification
The FAA type deep bases will be constructed to
comply with standards FAA L-867, L-868 of AC
150/5345-42B and LB-1, LB-4, LB-4B E1315.
They will allow :
- Ground fixing of elevated and inset fittings.
- Underground housing of Isolating Transformer(s).
- Underground housing of cable junctions.
The L-868 deep bases will be load bearing and
designed to withstand aircraft or vehicle loads.
Depending on the type of pavement, The L-868 deep
base will exist in two versions :
- One piece L-868 deep base for rigid cement
concrete pavements.
- Multiple sections L-868 deep base for flexible
asphalt pavements.
All these FAA type deep bases are made of hot
galvanise steel. Their bolt, nuts and fixing elements
are stainless steel. They will be on request equipped
with grounding lugs.
A special Jig will allow each base to be level,
oriented correctly and maintain in its final position
during installation.
All FAA deep base accessories as Spacer Rings,
Extensions, Covers and Plates will be available on
request.
All descriptions and photometric characteristics in this publication present only general particulars and shall not form part of any contract.
The right is reserved to change them without prior notification.
©Thorn Airfield Lighting
Version 1.0 (01 December 2002)
Page 4 / 4
FAA Type Deep Bases
Doc 1403.E