Touchdown zone elevation (TDZE)
Unfactored or Certified Landing Distance
Viscous Hydroplaning ...
Touchdown zone markers Meant to help define the touchdown zone, they show distance information in 500 foot increments. (The above drawing is illustrative only, and not to scale.)
Displaced threshold ...
Touchdown zone elevation (TDZE). The highest elevation in the first 3,000 feet of the landing surface, TDZE is indicated on the instrument approach procedure chart when straight-in landing minimums are authorized.
TOUCHDOWN ZONE- The first 3,000 feet of the runway beginning at the threshold. The area is used for determination of Touchdown Zone Elevation in the development of straight-in landing minimums for instrument approaches.
(See ICAO term TOUCHDOWN ZONE.) ...
touchdown zone (TDZ)
The first 3000 feet of the runway or the first third of the runway, whichever is less, measured from the threshold
~ Lighting (TDZ) - A system of two rows of transverse light bars located symmetrically about the runway centerline, usually at 100-foot intervals and extending 3,000 feet along the runway.
The ~ RVR will be reported whenever the observed value is less than 1500 m.
The Mid-point and Stop-end RVR will only be reported when the observed value is:
(a) Less than the ~ value; or
(b) Less than 600 m.
TECHNICAL STANDARD ORDER (TSO)
A performance specification and production compliance criteria applied to avionics and defined by FARs and the RTCA.
Do not use TDZE (~ elevation)
Over 90% of missed approach accidents occur on the second missed.
ATC cannot give a visual approach when visibility is less than three miles. In Class D airspace the ceiling must be better than a thousand feet.
On any runway, long or short, pick a definite ~ and hit it as accurately as you can; don't just land “somewhere” down the runway.
ALS systems are usually used in conjunction with other lighting systems, such as Runway End lights and ~ Lights, which mark the ends of the runway and the area in which the plane should touch the runway, respectively.
Glideslope: The vertical guidance portion of an Instrument Landing System. Usually at an angle of 3°, the glideslope produces a straight line of descent to the runway ~.
The instrument landing system (ILS) is a ground-based system that guides aircraft to safe landings during periods of low visibility or poor weather. It guides the pilot down an imaginary ramp at a shallow 3-degree angle that leads to the ~ of the runway surface.
by optical instruments (transmissometers) placed next to and aligned with a given runway. One or more measurements are usually provided, such as the touchdown (TD) zone, runway mid-point (MID) and rollout area (RO). If one value is reported it refers to the visibility measured in the ~.
See also: What is the meaning of Touchdown, Landing, Aircraft, Flight, Pilot?