KNRB · Naval Station Mayport / Admiral David L McDonald Field

JACKSONVILLE, FLORIDA · MEDIUM AIRPORT

Elevation ft

Runway

8,001

Longest ft · 05/23

30.39N

81.42W

Naval Station Mayport / Admiral David L McDonald Field serves Jacksonville, Florida at 15 ft elevation with its longest runway, 05/23, at 8,001 by 200 ft. The figures below are computed from FAA NASR runway data (via OurAirports) and the same rules of thumb JetDesk uses on the airport page in the app; the POH and current NOTAMs are the authority.

Military airfield. This is a military airfield in the FAA file. It is listed here for reference and for emergency planning. Civil use needs prior permission, there is no FBO, and no Jet A you can buy. Do not plan it as a fuel stop or a routine alternate.

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01Runways

Runway	Length × width	Surface	Lighting
05/23	8,001 × 200 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 15 ft is about 15°C. Every 1,000 ft of density altitude adds roughly 8 percent to a turboprop's takeoff distance and 5 percent to its landing distance. The table uses Piper Meridian book numbers (2,438 ft takeoff and 2,110 ft landing over a 50 ft obstacle at sea level, ISA, max weight) as a reference airplane; heavier turboprops and light jets scale the same way from their own POH figures.

Conditions	Density altitude	Takeoff est.	Landing est.	Landing × 1.5
Standard day (ISA, 15°C)	15 ft	2,441 ft	2,112 ft	3,167 ft
Warm day (ISA +10)	1,215 ft	2,675 ft	2,238 ft	3,357 ft
Hot day (ISA +20)	2,415 ft	2,909 ft	2,365 ft	3,547 ft
35°C afternoon	2,419 ft	2,910 ft	2,365 ft	3,548 ft

Planning aid only. Even on a 35°C afternoon the longest runway (05/23, 8,001 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,548 ft needed). The percentages are a generic rule of thumb applied to one reference airplane, not certified performance data for any specific aircraft, and the runway size categories describe the runway, not your airplane's suitability. Verify with the approved flight manual before every flight.

03Nearby fields with 5,000 ft or more

Listed for reference only: KNRB is not a field to divert to or buy fuel at.

Airport	Distance	Longest runway
FD48 Deep Forest Airport	9 nm S	6,425 ft
KFHB Fernandina Beach Municipal Airport	13 nm N	5,301 ft
KJAX Jacksonville International Airport	15 nm NW	10,000 ft
K4J6 St Marys Airport	23 nm N	5,000 ft

04Fuel and services at KNRB

There is no public FBO fuel to log at KNRB. JetDesk collects Jet A prices that pilots actually paid, at civil fields, and its route finder leaves military and private-use fields out of every ranking. Read what a fuel stop actually saves.

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