Union County Airport traffic pattern

Pattern altitude at Union County Airport (MRT · KMRT) is 2,000 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 Union County 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 KMRT reports it.

RWY 27LEFT traffic

Heading: 268° mag · 263° true
Dimensions: 4,218 × 75 ft
TPA: 2,000 ft MSL (≈1,000 AGL) · standard
Surface: Asphalt
Lights: 4-light PAPI (left) (3°)
Displaced thr: 123 ft
CTAF: 123.05

Enter the left downwind (heading 088°) on the 45° at 2,000 ft MSL (≈1,000 AGL).

More details — RWY 27

Threshold elev: 997 ft
Markings: nonprecision
Approach obstacle: Rr, 20 ft, 425 ft from threshold, 260 ft R of centerline — 11:1 slope to clear · penetrates the 20:1 visual approach surface
Threshold crossing height: 33 ft
TDZ elevation: 1,015 ft
End lights: REIL

Condition: Fair. Edge lights: Med. Weight bearing: Single wheel 17k.

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

Pattern direction by runway

Runway	Pattern	Heading	Pattern altitude
09	Left traffic	088° mag	2,000 ft MSL (≈1,000 AGL)
27	Left traffic	268° mag	2,000 ft MSL (≈1,000 AGL)

No pattern altitude is published for KMRT; 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 KMRT

Union County Airport is non towered, so the pattern is self announced on CTAF 123.05. AC 90-66B asks for a report on entry and on each leg, and for the standard 45° entry to downwind at pattern altitude.

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 KMRT?

Union County 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 2,000 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 KMRT have right traffic?

No. All 2 runway ends at Union County Airport use standard left traffic, so no right pattern is charted here.

What frequency is the pattern on at KMRT?

Union County Airport is non towered, so pattern position reports go on the CTAF, 123.05. AC 90-66B asks for self announcing on entry and on each leg.

More about KMRT

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.