Instruction Manual
Pro APF Series LED
ICAO RCL, TDZ, REX
The Crouse-Hinds ICAO Runway Centerline Light (RCL), Touchdown Zone Light (TDZ), and Rapid Exit
Taxiway Light (REX) are Style 3 lighting systems designed to facilitate landings, rapid exits, rollouts, and
takeoffs. The TDZ is primarily a landing aid, the RCL is used for both landing and takeoff operations,
while the REX 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 unit is 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 RCL may be unidirectional or bidirectional,
projecting two beams of light 180° apart. The TDZ is unidirectional only. They are weatherproof and will
endure roll over loads without damage. The light units consist of an optical assembly that must be secured
to a light base using four high-strength bolts. The optical assembly has a die cast inner cover that is
attached to a forged aluminum optical housing 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 a light base. The primary light emitting
lenses are held into the optical housing with a bracket, gasket and elastomeric boot. Either one or two LED
modules are fastened to the optical housing. 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-through
assemblies in the inner cover. The feed-throughs 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 203mm in diameter, 91mm deep and weighs 2.7kg. 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 RCL and TDZ light units are shipped complete, including the LED module(s), and are
ready for installation as received. Installation of a light unit is to be done with primary POWER OFF and
SECURED. At each light location, install a 203mm light base. For flush-to-grade installations, use Crouse-
Hinds P/N 22537-4 or 87103-4. For below grade installations, use Crouse-Hinds P/N 21378-4 or 21388-4.
For RCL, TDZ, and REX light units, install the light base with the alignment grooves perpendicular to the
runway centerline. Install the properly sized isolation transformer(s) and make necessary primary power
connections using FAA L-823 connectors. The RCL, TDZ, and REX light units’ minimum isolation
transformer requirements can be found in Section 12, Tables 2 & 3. All isolations transformers are 6.6
ampere secondary models.