Instruction Manual
ICAO Pro APF Series LED
RCLI, TDZI, & REXI
2
7 General Description
The Crouse-Hinds ICAO Runway Centerline Light (RCLI), Touchdown Zone Light (TDZI), and Rapid
Exit Taxiway Light (REXI) are Style 3 lighting systems designed to facilitate landings, rapid exits,
rollouts, and takeoffs. The TDZI is primarily a landing aid. The RCLI is used for both landing and takeoff
operations, while the REXI is used to provide distance-to-go information to the nearest rapid exit taxiway.
These lights meet the photometric requirements of ICAO Annex 14, Volume 1, Appendix 2, Figures A2-5,
A2-6, and A2-7 Cat I, II, and III. The light units are designed to fit on a 203mm light base (P/N 22537,
87103 or 21378) and have a total height above grade/ground level of ≤ 6mm. The RCLI may be
unidirectional or bidirectional, projecting two beams of light 180° apart. The TDZI is unidirectional only.
They are weatherproof and will endure roll over loads without damage.
The light units consist 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 and six 2-piece lock washers. The optical
assembly is secured to the ductile iron support ring using two high-strength bolts, two 2-piece lock
washers, and two aligning high-strength shear pins. The optical assembly has a forged aluminum optical
housing and an aluminum die-cast inner cover that are attached using four screws. An o- ring is used to
provide a water-tight seal between the inner cover and the optical housing. There may be an optional gasket
bonded to the outer cylinder of the inner cover to seal the optical assembly to the support ring. Either one or
two LED modules are fastened to the optical housing. The primary light emitting lenses are held into the
optical housing with a bracket, gasket, molded elastomeric boot and two screws. One plug (P1) light units
have one power supply fastened to the inner cover. Two plug (P2) and one plug with independent power
supplies (B1) versions have two power supplies fastened to the inner cover. Electrical connections are
made at 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. The light beam color can be changed by
switching LED module assemblies and power supply jumper configurations. All fasteners are type 18-8
stainless steel. The complete light unit is 303mm in diameter, 92mm deep, and weighs 9.5kg. Refer to
Section 10 for a list of spare and replacement parts.
Do not open any light unit unless the warranty period has expired.
Opening a light unit will void the warranty.
Never handle the light unit by the leads as this can break the waterproof seal.
8 Installation
The IEC Style 3 ICAO RCLI and TDZI light units are shipped complete, including the LED module(s), and
are ready for installation as received. Installation of the light unit is to be done with the primary POWER
OFF and SECURED. At each light location, install a steel, size B, 12 inch deep minimum, L-868 light base
per FAA AC 150/5340-4 (latest revision). For RCLI, TDZI, and REXI light units, install the light base with
two opposite bolt holes perpendicular to the runway centerline. Install the properly sized isolation
transformer(s) in the light base and make necessary primary power connections using FAA L-823
connectors. Isolation transformer requirements are dependent on a light unit’s plug and heater options. The
RCLI, TDZI, and REXI light units’ minimum isolation transformer requirements can be found in Section
12, Table 2 and 3. All isolation transformers are 6.6 ampere secondary models.