Question

If filing a flight plan from SEA to TWSIP intersection on J505, what is the minimum altitude you can file?

(a) Highest obstacle within 4 nm of the course
(b) 18,000 AGL
(c)FL 240
(d) FL 180

Answer 1

In aviation, the minimum altitude a pilot can file for airway J505 from SEA to TWSIP intersection, unless specified otherwise, is FL 180 (18,000 feet AGL), ensuring navigational signal coverage and obstacle clearance.

Step-by-step explanation:

The question pertains to the minimum altitude a pilot should file when planning a flight from Seattle-Tacoma International Airport (SEA) to the TWSIP intersection using airway J505. In United States aviation regulations, minimum en route altitudes (MEA) are established for specific segments of airways to ensure adequate navigational signal coverage and obstacle clearance. For jet routes, which are typically above 24,000 feet or Flight Level 240 (FL 240), the minimum altitude is often FL 180 (18,000 feet), unless otherwise specified on the aeronautical charts or required for obstacle clearance. Therefore, in this case, the minimum altitude you can file, if no higher MEA is depicted on the chart, would most likely be FL 180 (18,000 feet Above Ground Level or AGL).