Trajectory-Based Operations (TBO) - Joint Planning and ...
Trajectory-Based Operations (TBO) - Joint Planning and ...
Trajectory-Based Operations (TBO) - Joint Planning and ...
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<strong>Trajectory</strong>-<strong>Based</strong> <strong>Operations</strong> (<strong>TBO</strong>)<br />
Study Team Report<br />
at 8,000 feet (2,500 feet AGL). She lowers the l<strong>and</strong>ing gear <strong>and</strong> continues slowly while crossing<br />
CYOTE at 8,000 feet. The virtual tower controller advises N72MD that the Moon Air aircraft ahead<br />
has reported deteriorating visibility at the runway.<br />
When aircraft N43P is five nm east of the LIVINGSTON feeder fix, a data link message is received<br />
from the BZN virtual tower sequencing N43P to conduct the RNAV (RNP) RWY 30 Approach with<br />
five nm spacing behind aircraft N72MD. The pilot of N43P pushes a virtual button on his glass cockpit<br />
display to accept the clearance (WILCO). He sees on the CDTI display that aircraft N72MD has<br />
already started to RF leg from CYOTE to WOLFE. N43P’s onboard spacing tool determines a relative<br />
4DT for the approach to maintain adequate spacing behind the slower aircraft throughout the approach<br />
<strong>and</strong> l<strong>and</strong>ing. Upon reaching the EAGLE IAF, the pilot of N43P is instructed to contact the virtual<br />
tower via voice radio. The virtual tower ANSP clears N43P by voice for the approach <strong>and</strong> l<strong>and</strong>ing with<br />
delegated separation authority to conduct spacing behind N72MD. The pilot accepts the clearance via<br />
voice. This represents the first voice communication the pilot has had with a controller since leaving<br />
Cincinnati airspace. The assigned clearance means the controller intervenes by exception <strong>and</strong> only<br />
does so by voice when data communications are inadequate or the aircraft is not suitably equipped.<br />
N43P continues the approach, with onboard spacing tools continuously monitoring the progress of<br />
N72MD ahead <strong>and</strong> periodically updating the speed guidance for spacing.<br />
The pilot of N72MD begins to roll out of the RF turn to the final approach with situational awareness<br />
of the surrounding terrain <strong>and</strong> flight path via the SVS terrain <strong>and</strong> Highway-In-The-Sky (HITS)<br />
displays. Pathway deviation indicators provide the guidance necessary to accomplish the RF turn <strong>and</strong><br />
the RNP 0.1 approach. The pathway deviation indicators compensate adequately for the winds, <strong>and</strong> the<br />
pilot is able to maintain the course within RNP 0.1.<br />
The navigation display shows WOLFE (FAF) at rollout of the turn four nm from the RWY 30<br />
threshold with an altitude of 6,700 feet mean sea level (MSL). Upon reaching WOLFE, the virtual<br />
tower ANSP gives N72MD l<strong>and</strong>ing clearance via voice <strong>and</strong> instructs the pilot to report clear of the<br />
runway. Due to the high winds, the pilot will maintain an approach speed of Vref+20 until<br />
approximately one half mile from the runway threshold then slow to Vref+10 for l<strong>and</strong>ing. The aircraft<br />
is established on the straight-in segment of the final approach course at three nm from the runway.<br />
At approximately one mile from the runway, the snow increases in intensity. The virtual tower ANSP<br />
reports that the visibility is now down to less than a quarter mile in blowing snow. The pilot is able to<br />
use the SVS to maintain runway alignment <strong>and</strong> vertical profile, but has not visually acquired the<br />
runway before reaching decision height, <strong>and</strong> is forced to conduct a missed approach. The virtual tower<br />
ANSP provides vectors for N72MD to leave the BZN vicinity with a left turn to cross over SLOAN at<br />
10,000 feet. While in the turn, N72MD advises that she will proceed to her alternate <strong>and</strong> receives<br />
another vector from the ADS-B surveillance on course to successfully l<strong>and</strong> at an alternate airport with<br />
better current weather. At h<strong>and</strong>off from the virtual tower to the en route tactical controller, a new 4DT<br />
to the alternate has been determined, <strong>and</strong> will be provided to the pilot to go from an open to a closed<br />
trajectory in <strong>TBO</strong>.<br />
Aircraft N43P also encounters the higher intensity snow at one mile from the runway. However, N43P<br />
is equipped with an EVS in addition to its SVS. The N43P EVS provides the pilot with current runway<br />
<strong>Joint</strong> <strong>Planning</strong> <strong>and</strong> Development Office<br />
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