San Marcos Regional Airport traffic pattern

Pattern altitude at San Marcos Regional Airport (HYI · KHYI) is 1,600 ft MSL (≈1,000 AGL) by the standard convention — none is published for this field, and every runway end is standard left traffic.

All of San Marcos Regional Airport — runways, frequencies, charts and live weather

Pattern diagram

Drawn to scale from the FAA NASR runway alignments and the per end right traffic flags — pick a runway to see its pattern. Live wind picks the favored runway when KHYI reports it.

RWY 13LEFT traffic

Heading: 126° mag · 133° true
Dimensions: 5,601 × 100 ft
TPA: 1,600 ft MSL (≈1,000 AGL) · standard
Surface: Asphalt
Lights: 2-light PAPI (left) (3°) + MALS
ILS: ILS · CAT I · LOC 108.7 (RUM) · GS 3.00°
CTAF: 126.825

More details — RWY 13

Threshold elev: 593 ft
Markings: precision
Threshold crossing height: 57 ft
TDZ elevation: 593 ft

Condition: Good. Edge lights: Med. Weight bearing: Single wheel 60k.

Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates

Pattern direction by runway

Runway	Pattern	Heading	Pattern altitude
08	Left traffic	081° mag	1,600 ft MSL (≈1,000 AGL)
26	Left traffic	261° mag	1,600 ft MSL (≈1,000 AGL)
13	Left traffic	126° mag	1,600 ft MSL (≈1,000 AGL)
31	Left traffic	306° mag	1,600 ft MSL (≈1,000 AGL)
17	Left traffic	171° mag	1,600 ft MSL (≈1,000 AGL)
35	Left traffic	351° mag	1,600 ft MSL (≈1,000 AGL)

No pattern altitude is published for KHYI; the figure above is the AC 90-66B 1,000 ft AGL convention for propeller aircraft, rounded to the field. Turbine aircraft normally fly 1,500 ft AGL. Headings are the runway alignment; downwind is the reciprocal.

Flying the pattern at KHYI

San Marcos Regional Airport is towered, working 126.825. Contact the tower before entering the surface area and fly the pattern you are assigned — the directions below are the charted default when no instruction is given.

All ends are left traffic, which is the FAR 91.126 default — turns to the left unless the field charts otherwise. The full entry procedure is here →

Frequently asked

What is the traffic pattern altitude at KHYI?

San Marcos Regional Airport has no traffic pattern altitude published in the FAA NASR data. The AC 90-66B convention for propeller aircraft is 1,000 ft AGL, which works out to roughly 1,600 ft MSL (≈1,000 AGL) here — but confirm it against the Chart Supplement before you fly, since a field can have a non standard pattern altitude that NASR does not carry.

Does KHYI have right traffic?

No. All 6 runway ends at San Marcos Regional Airport use standard left traffic, so no right pattern is charted here.

Do I fly a standard pattern at KHYI?

San Marcos Regional Airport is towered (126.825), so the pattern shown here is the charted default — but the controller's instruction overrides it. Expect straight in approaches, base entries and midfield crossings as traffic dictates.

More about KHYI

Pattern direction and alignment are drawn from the FAA NASR (28-day cycle); the diagram is generated, not an FAA chart. Pattern altitude is shown as published where NASR carries one, otherwise as the AC 90-66B 1,000 ft AGL convention. For planning and education only; always verify against the Chart Supplement.