M91 Springfield Robertson County

PROBABLE 60%

Runway 4 — wind slightly favors it, low confidence

Based mostly on wind; no traffic or ATIS to confirm. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available.

certainty: 60% evidence: NONE no tower now

Wind 050° true at 4 kt · VFR · 20 min old · from KBNA (27.9 nm away)

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4 59% 5505 ft · 4 kt head, 1 kt x-right

22 41% 5505 ft · 4 kt TAIL, 1 kt x-left · calm-wind rwy

Active NOTAMs affecting runways

LIGHTING RWY 22 until 03-24 21:11Z

RWY 22 RWY END ID LGT U/S

APCH OTS RWY 4 until 10-23 20:00Z

NAV ILS RWY 04 LOC U/S

Why — evidence behind this answer

Runway 4

WIND 4 kt headwind, 1 kt right crosswind 20 min ago +0.20

Runway 22

WIND 4 kt TAILWIND, 1 kt left crosswind 20 min ago -0.69
PRIOR 22 is the designated calm-wind runway +0.50

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	20 min	Nearest station KBNA (27.9 nm away)
ADSB	UNAVAILABLE		No ADS-B track history here yet
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (No ADS-B track history here yet)

Was this right?

M91 field & runways

Springfield Robertson County, Springfield, Tennessee. Field elevation 706 ft. Non-towered (NON-ATCT). Magnetic variation 3.0°W on record, 4.2°W today.

The FAA's variation of record is the number this field was surveyed against; the second is where north points now, from WMM2025. It is moving 0.053°/year west — about 1° every 19 years — which is why runway numbers eventually stop matching their pavement.

Runway data from the FAA NASR 01 Oct 2026 cycle. Where NASR locates both thresholds, the true heading is the bearing between them rather than NASR's whole-degree alignment. Magnetic is that heading against *today's* declination from WMM2025, not the field's variation of record — so it can differ from the chart by the gap between the two shown above. The number painted on the runway is the one ATC uses.
Runway	True	Magnetic	Number	Length	Surface	Pattern	Notes
22	213.5°	217.7°	matches	5,505 ft	ASPH	left	calm-wind CALM WIND RWY.
4	33.5°	37.7°	matches	5,505 ft	ASPH		ILS

Generated 11:13:16Z · auto-refreshes · JSON

M91 ☆ Springfield Robertson County