KMBT Murfreesboro Municipal Airport — Instrument Checkride Guide

What kind of airport is KMBT and what is its IFR environment?

Murfreesboro Municipal Airport (KMBT) is an uncontrolled general aviation airport in Middle Tennessee at 614 ft MSL, approximately 30 nm southeast of Nashville International Airport (KBNA). There is no control tower — the airport operates on CTAF/UNICOM 123.075 MHz. Nashville Approach on 118.4 MHz is the controlling facility for all IFR operations at KMBT. The airport has an AWOS-3 weather observation system broadcasting on 133.975 MHz.

KMBT's proximity to Nashville Class B airspace means IFR flights toward Nashville will coordinate closely with Nashville Approach and may transit Class B airspace. Under 14 CFR 91.131, explicit ATC clearance is required before entering Class B airspace — on an IFR clearance from Nashville Approach, this clearance is embedded in the routing.

Special takeoff minimums and departure procedures are published at KMBT. These must be reviewed in the FAA Terminal Procedures Publication before every IFR departure. Training pattern operations are restricted at KMBT during certain hours (2200–0700 weekdays; 2200–0800 weekends and holidays) to manage noise impacts on surrounding communities.

What instrument approaches are published at KMBT?

KMBT publishes 2 instrument approach procedures — both RNAV (GPS). There is no ILS, localizer, or VOR approach at this airport, sourced from AirNav and verified against current SkyVector chart listings.

Both approaches use LNAV minima as the baseline. LPV guidance availability depends on current WAAS satellite geometry and NOTAM status — verify before flight using the FAA's WAAS NOTAM or your avionics' built-in LPV prediction. Special alternate minimums apply: when KMBT is below standard alternate minimums, it may not qualify as a legal IFR alternate under 14 CFR 91.169.

What is the runway configuration at KMBT?

KMBT has a single runway: 18/36 at 4,750 × 100 ft with an asphalt surface. This is a comparatively short instrument runway — pilots operating heavier or faster aircraft should carefully compute landing distance from the POH and confirm the runway is adequate before filing KMBT as a destination in IMC.

There is no approach lighting system on either runway end at KMBT. On short final in low ceilings at MDA, the visual transition relies entirely on runway threshold markings, runway edge lights, and PAPI. Pilots should brief this explicitly: you need the runway environment in sight — not just approach lights (which do not exist here) — to descend below MDA per 14 CFR 91.175(c).

What weather should instrument pilots expect at KMBT?

Middle Tennessee's weather is characterized by broad frontal systems that produce widespread IFR conditions, primarily in winter. Cold fronts pushing through the Nashville basin can drop ceilings below 1,000 ft for 12–24 hours with associated rain, drizzle, and occasional freezing precipitation. The absence of precision approach capability at KMBT means pilots must have realistic alternate planning — KBNA or KSMX with ILS capability should be briefed as alternates anytime KMBT weather is forecast marginal.

Summer weather is dominated by convective activity. Middle Tennessee sits in a zone that receives significant afternoon thunderstorm activity, especially when moisture-laden Gulf air advances northward ahead of weak disturbances. KMBT has no on-site instrument meteorologist; the AWOS-3 reports automated observations, and pilots must supplement with area PIREPs and the Nashville forecast from the National Weather Service.

Radiation fog is common in the narrow creek valleys surrounding Murfreesboro in autumn and early spring. Surface visibility can drop rapidly at night and early morning. AWOS-3's automated visibility report may not capture localized fog at the airport perimeter as accurately as a human observer would.

What should you expect on an instrument checkride at KMBT?

A checkride at Murfreesboro Municipal is fundamentally different from one at a Class C or Class B reliever airport. There is no tower — you are self-announcing position on CTAF throughout, coordinating with Nashville Approach for IFR, and managing your own traffic awareness in a busy training environment. The DPE will evaluate how you handle this combination: maintaining instrument scan while simultaneously monitoring CTAF for conflicting traffic is a real task management challenge.

The RNAV (GPS) approaches here are non-precision by default. At LNAV minima, you will fly to an MDA and must see the runway environment to continue the descent. There is no approach lighting to serve as a bridge between IMC and visual contact — the transition from instruments to visual is immediate at MDA. This makes KMBT a particularly demanding place to demonstrate non-precision approach proficiency in actual low ceilings, which is precisely why DPEs use smaller airports for this evaluation.

Expect an oral discussion centered on the special alternate minimums. The DPE will ask why KMBT has special alternate minimums, what the standard alternate weather requirements are under 14 CFR 91.169, and how you would select a legal alternate if KMBT weather is forecast at 700 ft overcast. Know the one- and two-hour alternate rules cold — this is a foundational IFR planning question.

The departure procedure discussion is equally important. Special takeoff minimums at KMBT mean you must brief the departure procedure from the Terminal Procedures Publication before every IFR departure. The DPE may ask what obstacle you are avoiding, what the required climb gradient is, and what you would do if your aircraft cannot meet the gradient.

Practice Questions

1. You are planning an IFR flight to KMBT. The forecast at ETA is 700 ft overcast, 2 miles in mist. Do you need an alternate? Walk the DPE through the one-two-three rule under 14 CFR 91.169 and explain whether KMBT qualifies as its own alternate.

2. On the RNAV (GPS) RWY 18 at KMBT, you reach MDA and see no runway environment — only darkness ahead. There is no approach lighting at KMBT. What is your required action, and at what point is the missed approach mandatory under 14 CFR 91.175(c)?

3. KMBT has special takeoff minimums and departure procedures. Where do you find this information, what does it require, and what is the consequence of departing below published special takeoff minimums as a Part 91 operator?

4. Nashville Approach clears you direct to KMBT for the RNAV (GPS) RWY 36. Your WAAS avionics shows "LNAV" rather than "LPV." Explain three possible reasons for the degraded mode and the effect on your approach minimums.

5. The DPE asks: you are flying the RNAV RWY 18 and at 1,000 ft AGL the vacuum pump fails. Your aircraft has electric attitude and heading indicators as backup. Walk through your automation degradation plan and whether you continue the approach or execute an immediate missed approach.

Frequently Asked Questions

Q: What instrument approaches are published at KMBT?

KMBT publishes RNAV (GPS) approaches to runway 18 and runway 36. There are no ILS, LOC, or VOR approaches at Murfreesboro Municipal. Special alternate minimums and special takeoff minimums and departure procedures apply — both must be checked before any IFR flight to KMBT.

Q: Does KMBT have an ILS approach?

No. Murfreesboro Municipal Airport (KMBT) does not have a published ILS or localizer approach. All instrument approaches are RNAV (GPS) only — runway 18 and runway 36. Pilots requiring precision guidance must plan alternates with ILS capability.

Q: What airspace class is Murfreesboro Municipal Airport?

KMBT has no control tower and operates as an uncontrolled airport with Class E airspace to the surface when IFR conditions prevail. Nashville Approach on 118.4 MHz handles IFR arrivals and departures. CTAF/UNICOM frequency is 123.075 MHz.

Q: What is the weather observation at KMBT?

KMBT has an AWOS-3 that broadcasts on 133.975 MHz. AWOS-3 provides automated wind, altimeter, temperature, dewpoint, density altitude, visibility, and precipitation type but does not provide a human-generated sky condition assessment.

Q: What special takeoff minimums apply at KMBT?

KMBT has published special takeoff minimums and departure procedures. Pilots must check the published departure procedure in the FAA Terminal Procedures Publication before filing IFR from KMBT. Part 91 operators are not legally required to comply with special takeoff minimums, but the procedure identifies terrain and obstacle constraints that are operationally significant.

Q: How close is KMBT to Nashville Class B airspace?

Murfreesboro is approximately 30 nm southeast of Nashville International (KBNA). IFR flights from KMBT toward Nashville will transit or closely approach the outer shelves of Nashville Class B airspace. An IFR clearance from Nashville Approach satisfies the 14 CFR 91.131 clearance requirement.

Q: What is the field elevation at Murfreesboro Municipal Airport?

Murfreesboro Municipal Airport (KMBT) has a surveyed field elevation of 614 ft MSL in the rolling Middle Tennessee plateau southeast of Nashville.

Sources

• AirNav — KMBT Airport Information
• SkyVector — KMBT Instrument Approach Procedures
• 14 CFR 91.131 — Operations in Class B Airspace (Cornell LII)
• 14 CFR 91.169 — IFR Flight Plan: Alternate Airport Requirements (Cornell LII)
• 14 CFR 91.175 — Takeoff and Landing Under IFR (Cornell LII)
• FAA Instrument Flying Handbook FAA-H-8083-15B

This article was researched from FAA primary sources (ACS, FAR/AIM, Advisory Circulars, Instrument Flying Handbook), approach procedure data from AirNav and SkyVector, and citing current 14 CFR Part 91 — drafted by MockDPE. Last updated: May 2026. If you spot an inaccuracy, email corrections@mockdpe.org.