Components and Characteristics of the Instrument Landing System (ILS)
T-45A UJPT & E2-C2 INav-04
3.
Touchdown Zone Lights (TDZLs)
a.
Incorporate two rows of transverse light bars disposed
symmetrically about the runway centerline in the runway
touchdown zone.
b.
Spaced at 100-ft intervals
c.
System starts 100 ft from landing threshold and extends to
3,000 ft from the threshold or the midpoint of the runway,
whichever is less
C. Runway Lights
1.
Runway End Identifier Lights (REILs)
a.
Provide rapid and positive ID of the approach end of a runway
b.
Consist of a pair of synchronized flashing lights laterally
located on each side of the runway threshold
c.
May be either omnidirectional or unidirectional facing the
approach area
2.
Runway Edge Light System
a.
Identifies a runway:
(1) Surrounded by a large concentration of other lighting
(2) That lacks contrast with surrounding terrain
(3) During reduced visibility
b.
Physical characteristics:
(1) Normally white except for instrument runways where yellow
lights replace the white edge lights for the last 2,000 ft of
the runway or half the runway length, whichever is less.
This forms a caution zone for landings
(2) Lights emit green outward from the runway approach end
to indicate the threshold to landing aircraft
(3) Lights marking the ends of the runway emit red light toward
the runway to indicate the end of the runway to departing
aircraft
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