Richard B Helgeson Airport traffic pattern

Pattern altitude at Richard B Helgeson Airport (TWM · KTWM) is 2,100 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 Richard B Helgeson 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 KTWM reports it.

RWY 15LEFT traffic

Heading: 148° mag · 149° true
Dimensions: 2,581 × 150 ft
TPA: 2,100 ft MSL (≈1,000 AGL) · standard
Surface: Turf
CTAF: 122.9

Enter the left downwind (heading 328°) on the 45° at 2,100 ft MSL (≈1,000 AGL).

More details — RWY 15

Threshold elev: 1,072 ft
TDZ elevation: 1,072 ft

Condition: Good.

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
06	Left traffic	061° mag	2,100 ft MSL (≈1,000 AGL)
24	Left traffic	241° mag	2,100 ft MSL (≈1,000 AGL)
15	Left traffic	148° mag	2,100 ft MSL (≈1,000 AGL)
33	Left traffic	328° mag	2,100 ft MSL (≈1,000 AGL)

No pattern altitude is published for KTWM; 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 KTWM

Richard B Helgeson Airport is non towered, so the pattern is self announced on CTAF 122.9. 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 KTWM?

Richard B Helgeson 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 2,100 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 KTWM have right traffic?

No. All 4 runway ends at Richard B Helgeson Airport use standard left traffic, so no right pattern is charted here.

What frequency is the pattern on at KTWM?

Richard B Helgeson Airport is non towered, so pattern position reports go on the CTAF, 122.9. AC 90-66B asks for self announcing on entry and on each leg.

More about KTWM

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.