Document 9913
Rev. V
Instruction Manual
Style 3
Runway Centerline Light L-850A & Touchdown Zone Light L-850B
3
7
General
Description
7.1
Runway Centerline Light, L-850A
The Crouse-Hinds Style 3 Runway Centerline Light is an ITS verified FAA L-850A per FAA AC 150/5345-46
(latest revision). It is designed for installation at the centerline of runways or any other location where visual
guidance of moving aircraft or ground vehicles is desirable. The fixture is designed to fit on a FAA L-868, steel,
Size B light base per FAA AC 150/5345-42(latest version), and have a total height above grade/ground level of
.250 inch. The fixture is bi-directional, projecting two beams of light 180
°
apart. It is weatherproof and will
endure roll over loads without damage. The light fixture consists of a ductile iron support ring and a removable
aluminum optical assembly. The ductile iron ring is mounted to a light base with six bolts (3/8-16 UNC x1½ lg.,
stn. stl.) and 2 piece washers (3/8, stn. Stl.). The aluminum optical housing is secured to the ductile iron ring
using two high-strength bolts and two high-strength shear pins. The optical housing has a die cast inner cover
that is attached using 4 screws. A polyurethane o-ring is used to provide a watertight seal between the inner
cover and the optical housing (see section 9.3). An optional silicone gasket is bonded to the outside of the inner
cover to provide a watertight seal between the optical assembly and the ductile iron support ring. Two 48-watt,
MR-16 lamps are secured to two brackets, which are fastened to the bottom housing. Electrical connections are
made at either one or two feed-thru assemblies in the inner cover. The feed-thrus have ITS verified L-823 plugs
for connecting to FAA L-830/ L-831 Isolation Transformers. Lenses are held into the aluminum housing with a
bracket, gasket, molded elastomeric boot and two screws. Red dichroic-coated lenses are available from the
factory, or may be installed in the field. All hardware is type 18-8 stainless steel. The complete light unit is
11.94 inches in diameter, 3.63 inches deep, and weighs 20 lbs.
7.2
Touchdown Zone Light, L-850B
The Crouse-Hinds Touchdown Zone Light is an ITS verified FAA L-850B per FAA AC 150/5345-46 (latest
revision). Except for being unidirectional, its design is identical to the L-850A described in section 7.1. Toe-in
of the light beam is obtained internally by alignment of the lamp bracket holes and the corresponding holes in
the bottom housing. The toe-in direction orientation can be straight, toe-left or toe-right
Toe-Left Straight Toe-Right
Figure 1
