(Refer to FAA-CT-8080-3F, Figure 158.) With winds reported as from 330° at 4 knots, you are given instructions to taxi to runway 4 for departure and to expect takeoff after an airliner departs from runway 29. What effect would you expect from that airliner's vortices?

Figure 158, RNAV (GPS) RWY 11, Grand Junction (GJT): figure for "(Refer to FAA-CT-8080-3F, Figure 158.) With winds reported as from 330° at 4 knots, you are given instructions" — **How to read it:** Read it top to bottom: briefing strip (frequencies, missed approach), plan view, profile view, then the minimums table at the bottom.

The winds will push the vortices southeast of your takeoff path.

The upwind vortex would tend to remain over the runway.✓ Correct Answer

The downwind vortex will rapidly dissipate.

Explanation

Runway 29 at GJT is aligned about 297 degrees, so a wind from 330 at 4 knots gives a crosswind component of roughly 2 knots from the right. AIM 7-4-4 notes that a light cross-runway component of 1 to 5 knots can keep the upwind vortex over the runway for a while and hasten the drift of the downwind vortex, so the vortices are not simply blown clear and the downwind vortex does not dissipate because of the wind.

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