Grosse Ile Municipal Airport

ONZ · KONZ · Detroit/Grosse Ile, MI · 591 ft elevation · var 7W · Non-towered

Overview Weather Runways Comms & NavAids Charts Services & info

Airport information

ICAO / IATA: KONZ
Coordinates: 42.0991, -83.1615
Elevation: 591 ft MSL
Magnetic variation: 7W
Sectional chart: DETROIT
Airport use: Public
Control tower: No
Weather station: AWOS-3P · 119.675 · ☎ 734-692-9686
ARTCC: CLEVELAND (ZOB)
Flight service (FSS): LANSING
NOTAM facility: ONZ
Attendance: MON-FRI 0800-1800; SAT-SUN PRIOR ARNGMT
Beacon: white-green (SS-SR)
Segmented circle: Yes
Wind indicator: lighted
Activated: 1941/05
Distance from city: 2 S

Weather

METAR observed

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TAF forecast

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Sun & FAA night 2026-06-21

Event	Local (EDT)	UTC
Morning civil twilight Loggable night ends	05:22 AM	09:22Z
Sunrise	05:57 AM	09:57Z
Sunset	09:12 PM	01:12Z
Evening civil twilight Loggable night begins	09:47 PM	01:47Z

Loggable night (§1.1)

09:47 PM → 05:22 AM

Night currency (§61.57)

10:12 PM → 04:57 AM

Plan a flight from KONZ

Destination (ICAO)

TAS (kt)Burn (gph)Reserve (hr)Wind from (°)Wind (kt)

Night operations

Airport lighting: SEE RMK
Rotating beacon: white-green · SS-SR
Pilot-controlled lighting: ACTVT REIL RWY 04 & 22; PAPI RWY 04, 22, 17, & 35; MIRL RWY 04/22 & 17/35 - CTAF. on 123.0 — Chart Supplement ↗

Runway lighting aids — 04: 4-light PAPI (left) · 22: 4-light PAPI (left) · 17: 4-light PAPI (left) · 35: 4-light PAPI (left).

FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are in the live weather panel above.

Traffic pattern

Landing runway

RIGHT traffic

Landing: Rwy 04 · 037°
Pattern: right (turns right)
TPA: 1,600 ft MSL (≈1,000 AGL)
CTAF: 123.0

Enter the right downwind for Rwy 04 at 1,600 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).

Runway 04/22

4,846 ft × 100 ft · Asphalt (Good)

Edge lights: Med. Weight bearing: Single wheel 66k, Double wheel 83k, Dual tandem 105k.

Heading: 037° mag · 30° true
Markings: nonprecision
VGSI: 4-light PAPI (left) (3.04°)
Traffic pattern: Right
Approach obstacle: Tree, 37 ft, 790 ft from threshold, 308 ft L of centerline — 15:1 slope to clear · penetrates the 20:1 visual approach surface
End lights: REIL

Heading: 217° mag · 210° true
Markings: nonprecision
VGSI: 4-light PAPI (left) (3.04°)
Traffic pattern: Left
Approach obstacle: Trees, 65 ft, 1,010 ft from threshold, 344 ft L of centerline — 12:1 slope to clear · penetrates the 20:1 visual approach surface
End lights: REIL
Displaced threshold: 428 ft

Runway 17/35

4,424 ft × 75 ft · Concrete (Poor)

Edge lights: Med. Weight bearing: Single wheel 40k, Double wheel 55k, Dual tandem 90k.

Heading: 174° mag · 167° true
Markings: basic
VGSI: 4-light PAPI (left) (3°)
Traffic pattern: Left
Approach obstacle: Trees, 80 ft, 1,180 ft from threshold, 40 ft R of centerline — 12:1 slope to clear · penetrates the 20:1 visual approach surface
Displaced threshold: 672 ft

Heading: 354° mag · 347° true
Markings: basic
VGSI: 4-light PAPI (left) (3°)
Traffic pattern: Right

Will it fit? Your aircraft's required runway length (from the POH) — checked against every runway here

ft · ≥1.5× comfortable, under 1.25× tight · saved across airports

Runway	Length	Your margin
04/22	4,846 ft
17/35	4,424 ft

Communication frequencies

Service	Frequency	Notes
APCH/P DEP/P	134.3
APCH/P DEP/P	284.0
CTAF	123.0	ACTVT REIL RWY 04 & 22; PAPI RWY 04, 22, 17, & 35; MIRL RWY 04/22 & 17/35 - CTAF.
UNICOM	123.0
ONZ AWOS-3P	119.675

Source: FAA NASR (current 28-day cycle).

Nearby navigation aids

NavAid	Type	Freq	Radial / Dist magnetic
DXO · Detroit	VOR-DME	113.40	r133° / 11.4 NM
CRL · Carleton	VORTAC	115.70	r080° / 13.5 NM
SVM · Salem	VORTAC	114.30	r137° / 26.8 NM
MTC · Selfridge	TACAN	133.70	r211° / 34.1 NM
PSI · Pontiac	VORTAC	111.00	r158° / 39.7 NM

Procedures at a glance

Lowest mins: RNAV (GPS) · vertical guidance Takeoff mins / ODP ↗ Non-std alternate mins ↗

Approaches3

Departures

Arrivals

Minimums & Hot Spots

Chart Supplement FAA A/FD

Open PDF ↗

Preview Chart Supplement

VFR sectional

Open KONZ on the VFR sectional (SkyVector) ↗

Services

Fuel available: 100LL, Jet A
Bottled oxygen: NONE
Bulk oxygen: NONE
Airframe service: MAJOR
Powerplant service: MAJOR
Parking: tiedowns, hangars
Other services: Charter, Instruction, Rental

Ownership & management

Owner

TOWNSHIP OF GROSSE ILE

PO BOX 129, PO BOX 129, GROSSE ILE, MI

734-675-0155

Manager

JANEL MACNEE

P.O. BOX 129, PO BOX 129, GROSSE ILE, MI

734-675-0155

Remarks FAA

ARPT CLSD TO ACR OPS GTR THAN 30 PAX SEATS EXC PPR CALL AMGR.
BIRDS & DEER ON & INVOF ARPT.
ULTRALIGHT & PWRD PRCHT ACT INVOF ARPT.
FOR CD CTC DETROIT APCH AT 734-955-1404.
ACTVT REIL RWY 04 & 22; PAPI RWY 04, 22, 17, & 35; MIRL RWY 04/22 & 17/35 - CTAF.
APCH RATIO 20:1 TO DTHR.
EXTSV PEELING & CRACKING - FOD HAZ.

Nearby airports

MI53 · Mills FieldPrivate (7 NM)78MI · Carls AirportPrivate (7 NM)99MI · Newport Meadows Airport (9 NM)9MI2 · Newport Woods AirportPrivate (9 NM)W87 · Wickenheiser Airport (11 NM)KDTW · Detroit Metropolitan Wayne County Airport (11 NM)

Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open KONZ in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.

About KONZ

Grosse Ile Municipal Airport (ONZ · KONZ) is an airport in Detroit/Grosse Ile, MI, at 591 ft MSL. It has 2 runways, the longest 4,846 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for KONZ, refreshed from the Aviation Weather Center and FAA NASR.

Does KONZ have a control tower?

No. Grosse Ile Municipal Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.

What is the longest runway at KONZ?

Grosse Ile Municipal Airport has 2 runways; the longest is 4,846 ft. See the Runways tab for headings, surface, and lighting.

Where is KONZ?

Grosse Ile Municipal Airport is in Detroit/Grosse Ile, MI, at an elevation of 591 ft MSL. Coordinates: 42.0991, -83.1615.

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