How Far is That?
In your October clinic, “Driving All Night” you mention “Flying the full procedure is a cross-country drive of 12 miles to HUSKR.” Thinking HUSKR should be JUSAM, or am I interpreting it incorrectly?
Barry McCollom
Kerrville, TX
Readback May 2018
I was able to pull the ODP data but not the SID data, but I can give a fairly good guess as to whats going on. On the ODP, the controlling obstacle is a 2729-foot tower a few miles to the east of the runway. The initial climb is extended a bit more than usual in order to allow for a standard climb gradient when turning right (note that for turns other than to the right, a normal 400-foot turn is allowed). The WENDY and TRUPR are examples of Open SIDs, which have a route off the runway followed by radar vectors to a route. In these cases, the route off the runway is evaluated, but then the radar vector area gets no additional evaluation (other than MVA, etc.). SID evaluation begins again at the defined route. Because theres no SID evaluation required after the initial climb, the controlling obstacle for the ODP isnt considered. The minimum turning altitude for an RNAV SID is 500 feet above the runway, which would give you a turn at 1800 vs. the turn at 1900 on the ODP to keep a standard climb gradient and clear the tower. -LS
Key Takeaways:
- The article clarifies aviation procedural nuances, explaining differences in turn altitudes between SIDs and ODPs due to obstacle clearance and the specific conditions under which lead radials are depicted for DME arcs.
- It addresses corrections regarding a previously cited navigational distance and identifies an incorrect Canadian aircraft registration format used in a quiz.
- A reader's request for an inaccessible past article prompts the magazine to seek assistance from its readership.
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