567 

Federal Aviation Administration, DOT 

§ 77.19 

(a) 

Horizontal surface. A horizontal 

plane 150 feet above the established air-
port elevation, the perimeter of which 
is constructed by SW.inging arcs of a 
specified radii from the center of each 
end of the primary surface of each run-
way of each airport and connecting the 
adjacent arcs by lines tangent to those 
arcs. The radius of each arc is: 

(1) 5,000 feet for all runways des-

ignated as utility or visual; 

(2) 10,000 feet for all other runways. 

The radius of the arc specified for each 
end of a runway will have the same ar-
ithmetical value. That value will be 
the highest determined for either end 
of the runway. When a 5,000-foot arc is 
encompassed by tangents connecting 
two adjacent 10,000-foot arcs, the 5,000- 
foot arc shall be disregarded on the 
construction of the perimeter of the 
horizontal surface. 

(b) 

Conical surface. A surface extend-

ing outward and upward from the pe-
riphery of the horizontal surface at a 
slope of 20 to 1 for a horizontal distance 
of 4,000 feet. 

(c) 

Primary surface. A surface longitu-

dinally centered on a runway. When 
the runway has a specially prepared 
hard surface, the primary surface ex-
tends 200 feet beyond each end of that 
runway; but when the runway has no 
specially prepared hard surface, the 
primary surface ends at each end of 
that runway. The elevation of any 
point on the primary surface is the 
same as the elevation of the nearest 
point on the runway centerline. The 
width of the primary surface is: 

(1) 250 feet for utility runways having 

only visual approaches. 

(2) 500 feet for utility runways having 

non-precision instrument approaches. 

(3) For other than utility runways, 

the width is: 

(i) 500 feet for visual runways having 

only visual approaches. 

(ii) 500 feet for non-precision instru-

ment runways having visibility mini-
mums greater than three-fourths stat-
ute mile. 

(iii) 1,000 feet for a non-precision in-

strument runway having a non-preci-
sion instrument approach with visi-
bility minimums as low as three- 
fourths of a statute mile, and for preci-
sion instrument runways. 

(iv) The width of the primary surface 

of a runway will be that width pre-
scribed in this section for the most pre-
cise approach existing or planned for 
either end of that runway. 

(d) 

Approach surface. A surface longi-

tudinally centered on the extended 
runway centerline and extending out-
ward and upward from each end of the 
primary surface. An approach surface 
is applied to each end of each runway 
based upon the type of approach avail-
able or planned for that runway end. 

(1) The inner edge of the approach 

surface is the same width as the pri-
mary surface and it expands uniformly 
to a width of: 

(i) 1,250 feet for that end of a utility 

runway with only visual approaches; 

(ii) 1,500 feet for that end of a runway 

other than a utility runway with only 
visual approaches; 

(iii) 2,000 feet for that end of a utility 

runway with a non-precision instru-
ment approach; 

(iv) 3,500 feet for that end of a non- 

precision instrument runway other 
than utility, having visibility mini-
mums greater that three-fourths of a 
statute mile; 

(v) 4,000 feet for that end of a non- 

precision instrument runway, other 
than utility, having a non-precision in-
strument approach with visibility 
minimums as low as three-fourths stat-
ute mile; and 

(vi) 16,000 feet for precision instru-

ment runways. 

(2) The approach surface extends for 

a horizontal distance of: 

(i) 5,000 feet at a slope of 20 to 1 for 

all utility and visual runways; 

(ii) 10,000 feet at a slope of 34 to 1 for 

all non-precision instrument runways 
other than utility; and 

(iii) 10,000 feet at a slope of 50 to 1 

with an additional 40,000 feet at a slope 
of 40 to 1 for all precision instrument 
runways. 

(3) The outer width of an approach 

surface to an end of a runway will be 
that width prescribed in this sub-
section for the most precise approach 
existing or planned for that runway 
end. 

(e) 

Transitional surface. These sur-

faces extend outward and upward at 
right angles to the runway centerline 
and the runway centerline extended at 

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