Displaced Runway Threshold
Posted: Sat Jun 01, 2013 4:00 pm
Most people think you can't land on them, that's what I was taught at least.
Doing a bit of reading, the TC AIM says:
AGA 3.3 Displaced Runway Threshold
Occasionally, natural and human-made obstacles penetrate
the obstacle limitation surfaces of the take-off and approach
paths to runways.
To ensure that a safe clearance from these obstacles is
maintained, it is necessary to displace the runway thresholds.
In the case of runways for which instrument approach
procedures are published in the CAP, the usable runway
distances for landings and takeoffs are specified as declared
distances. The displacements are also depicted on the
aerodrome or airport diagram in both the CAP and the CFS.
For other runways not having published CAP approaches,
the requisite data is given in the CFS. Where a threshold is
displaced, it is marked as shown in AGA 5.4.1.
When the portion of the runway before the displaced
threshold is marked with displaced threshold arrows (see
AGA 5.4.1), it is permissible to use that portion of the runway
for taxiing, for takeoff and for the landing roll-out from the
opposite direction. In addition, this displaced portion of the
runway may be used for landing; however, it is the pilot’s
responsibility to ensure that the descent path can be safely
adjusted to clear all obstacles. When taking off from the end
opposite to the displaced threshold, pilots should recognize
the fact that there are obstacles present that penetrated above
the approach slope to the physical end of the runway, which
resulted in the threshold being displaced.
When a section of a runway is closed, either temporarily because
of construction or permanently because the full length is no
longer required, the closed portion of the runway is unavailable
for the surface movement of aircraft for taxiing, take-off or
landing purposes and is marked with an “X”, indicating that
the area is not suitable for aircraft use. A lighted “X” may also
be used to mark a temporarily closed runway.
The closed portion of the runway may be shown on the
aerodrome or airport diagram in the CFS and the CAP for
identification purposes; however, declared distances will only
include runway length starting at the new threshold position.
______________________________________________________________________________________________________________________________________________
Then onto the FAA AIM
2. Displaced Threshold. A displaced threshold is a threshold located at a point on the runway other than the designated beginning of the runway. Displacement of a threshold reduces the length of runway available for landings. The portion of runway behind a displaced threshold is available for takeoffs in either direction and landings from the opposite direction. A ten feet wide white threshold bar is located across the width of the runway at the displaced threshold. White arrows are located along the centerline in the area between the beginning of the runway and displaced threshold. White arrow heads are located across the width of the runway just prior to the threshold bar, as shown in FIG 2-3-4.
______________________________________________________________________________________________________________________________________________
It doesn't say you can land on them as we can in Canada. Am I missing something???
Doing a bit of reading, the TC AIM says:
AGA 3.3 Displaced Runway Threshold
Occasionally, natural and human-made obstacles penetrate
the obstacle limitation surfaces of the take-off and approach
paths to runways.
To ensure that a safe clearance from these obstacles is
maintained, it is necessary to displace the runway thresholds.
In the case of runways for which instrument approach
procedures are published in the CAP, the usable runway
distances for landings and takeoffs are specified as declared
distances. The displacements are also depicted on the
aerodrome or airport diagram in both the CAP and the CFS.
For other runways not having published CAP approaches,
the requisite data is given in the CFS. Where a threshold is
displaced, it is marked as shown in AGA 5.4.1.
When the portion of the runway before the displaced
threshold is marked with displaced threshold arrows (see
AGA 5.4.1), it is permissible to use that portion of the runway
for taxiing, for takeoff and for the landing roll-out from the
opposite direction. In addition, this displaced portion of the
runway may be used for landing; however, it is the pilot’s
responsibility to ensure that the descent path can be safely
adjusted to clear all obstacles. When taking off from the end
opposite to the displaced threshold, pilots should recognize
the fact that there are obstacles present that penetrated above
the approach slope to the physical end of the runway, which
resulted in the threshold being displaced.
When a section of a runway is closed, either temporarily because
of construction or permanently because the full length is no
longer required, the closed portion of the runway is unavailable
for the surface movement of aircraft for taxiing, take-off or
landing purposes and is marked with an “X”, indicating that
the area is not suitable for aircraft use. A lighted “X” may also
be used to mark a temporarily closed runway.
The closed portion of the runway may be shown on the
aerodrome or airport diagram in the CFS and the CAP for
identification purposes; however, declared distances will only
include runway length starting at the new threshold position.
______________________________________________________________________________________________________________________________________________
Then onto the FAA AIM
2. Displaced Threshold. A displaced threshold is a threshold located at a point on the runway other than the designated beginning of the runway. Displacement of a threshold reduces the length of runway available for landings. The portion of runway behind a displaced threshold is available for takeoffs in either direction and landings from the opposite direction. A ten feet wide white threshold bar is located across the width of the runway at the displaced threshold. White arrows are located along the centerline in the area between the beginning of the runway and displaced threshold. White arrow heads are located across the width of the runway just prior to the threshold bar, as shown in FIG 2-3-4.
______________________________________________________________________________________________________________________________________________
It doesn't say you can land on them as we can in Canada. Am I missing something???
