Chapter 5
Table 5.3. Rotary-Wing Taxiway Shoulders.
Item
Item Description
Requirement
Remarks
No.
Slope downward from edge of shoulder.
(a) 40 mm [1"] drop-
5
Grade
off at edge of paved
(adjacent to paved
For additional grading criteria in primary
shoulder.
shoulder)
surface and clear area, see Chapter 3 for
(b) 5% slope first 3 m
fixed-wing facilities and Chapter 4 for
[10 ft] from paved
rotary-wing facilities.
shoulder.
NOTES:
1. Metric units apply to new airfield construction and where practical modification to existing airfields and heliports,
as discussed in paragraph 1.4.4.
2. The criteria in this manual are based on aircraft specific requirements and are not direct conversions from inch-
pound (English) dimensions. Inch-pound units are included only as a reference to the previous standard.
3. Airfield and heliport imaginary surfaces and safe wingtip clearance dimensions are shown as a direct conversion
from inch-pound to SI units.
5.8.1. Fillet Only Dimensions. At Army and Air Force aviation facilities, and at Navy and Marine
Corps facilities not serving large transport aircraft, only fillets (not lead-in to fillets) are required at
intersections. Fillets at taxiway intersections are arcs installed in accordance with Figure 5.4.
5.8.2. Fillet and Lead-in to Fillet Dimensions. At Navy and Marine Corps aviation facilities with
Class B runways serving large transport aircraft, fillets and lead-in to fillets are required at
intersections. Lead-in to fillets widen the taxiway immediately to an intersection. Fillets and lead-in to
fillets are installed in accordance with Figure 5.5.
5.9. High-Speed Runway Exits. If peak operations are expected to exceed 30 take-offs and landings per
hour, aircraft may be required to exit runways at greater than normal taxi speeds to maintain airfield
capacity. In these cases, an acute-angle exit taxiway may be required. Air Force designers should contact
their MAJCOM pavements engineer or HQ AFCESA/CESC for assistance. Army designers should
contact CEMRO-ED-TX. Navy and Marine Corps designers may use the criteria for transport aircraft
provided within Federal Aviation Administration (FAA) Advisory Circular (AC) 150/5300-13, Airport
Design.
5.10. Apron Access Taxiways. Apron access taxiways are provided for aircraft access onto an apron.
The number of apron taxiways should allow sufficient capacity for departing aircraft. The apron access
taxiways should be located to enhance the aircraft's departing sequence and route.
5.10.1. Parking Aprons. The minimum number of apron access taxiways for any parking apron will be
two.
5.10.2. Fighter Aircraft Aprons. Three apron access taxiways should be provided for aprons with over
24 parked fighter aircraft. Four entrance taxiways should be provided for aprons with over 48 parked
fighter aircraft.
5.11. Shoulders. Shoulders are provided along a taxiway to allow aircraft to recover if they leave the
paved taxiway. Paved shoulders prevent erosion caused by jet blast, support an occasional aircraft which
may wander off the taxiway, support vehicular traffic, and reduce maintenance of unpaved shoulder areas.
5-10
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