KHEG · Herlong Airport

JACKSONVILLE, FLORIDA · SMALL AIRPORT

Elevation ft

Runways

4,001

Longest ft · 07/25

30.28N

81.81W

Herlong Airport serves Jacksonville, Florida at 87 ft elevation with its longest runway, 07/25, at 4,001 by 100 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.

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01Runways

Runway	Length × width	Surface	Lighting
07/25	4,001 × 100 ft	asphalt	lit
11/29	3,500 × 100 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 87 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)	87 ft	2,455 ft	2,119 ft	3,179 ft
Warm day (ISA +10)	1,287 ft	2,689 ft	2,246 ft	3,369 ft
Hot day (ISA +20)	2,487 ft	2,923 ft	2,372 ft	3,559 ft
35°C afternoon	2,508 ft	2,927 ft	2,375 ft	3,562 ft

Planning aid only. Even on a 35°C afternoon the longest runway (07/25, 4,001 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,562 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

Useful as alternates, as fuel stops when the price at KHEG is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KVQQ Cecil Airport	5 nm SW	12,504 ft
KJAX Jacksonville International Airport	14 nm NE	10,000 ft
FD48 Deep Forest Airport	19 nm E	6,425 ft

04Jet A prices and FBOs at KHEG

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at KHEG, the app flags a price stale after two weeks, and the route finder ranks every field within a corridor of your route by net savings after the cost of the extra cycle. Log a price at KHEG or read what a fuel stop actually saves.

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