25 - Table 6-1. Fixed Wing Aprons.pdf

UFC 3-260-01

4 February 2019

Change 1, 5 May 2020

Table 6-1. Fixed-Wing Aprons

Table 6-1. Fixed-Wing Aprons

Item Class A Runway Class B Runway

RemarksNo. Description Requirement

1 Size and configuration

Variable

For Army and Air Force requirements, see the criteria listed below and AFMAN

32-1084.

For Navy and Marine Corps requirements, see UFC 2-000-05N .

As a general rule there are no standard sizes for aprons. They are individually designed to support specific aircraft uses. The dimensions are determined by the number and type of aircraft involved, the function of the apron, the maneuvering characteristics of the aircraft, the jet blast of the aircraft, and the degree of unit integrity to be maintained. Other determinants are the physical characteristics of the site, the relationship of the apron area to other airfield facilities, and the objective of the comprehensive plan.

2 Parking space width ("W")

Design aircraft wingspan Army and Air Force airfields. For V-22 parking dimensions, see Figure 6-44.

3 Parking space length ("L")

Design aircraft length Army and Air Force airfields. For V-22 parking dimensions, see Figure 6-44.

4 Wingtip clearance of parked aircraft (“P”)

3.1 m (10 ft)

Army and Air Force airfields, aircraft with wingspans up to 33.5 m (110 ft) For V-22 wingtip clearances, see Figure 6-44.

6.1 m (20 ft)

Army and Air Force airfields, aircraft with wingspans of 33.5 m (110 ft) or more except as noted below See note 1 for USAF.

7.7 m (25 ft)

Army and Air Force airfields, transient aprons, C-5 and C-17 aircraft (also see paragraph 6-5.8) See note 1 for USAF.

15.3 m (50 ft)

Army and Air Force airfields, KC-10, KC-46 and KC-135 aircraft to accommodate refueling and defueling operations.

See note 1 for USAF.

Change 1, 5 May 2020

Table 6-1. Fixed-Wing Aprons

Item Class A Runway Class B Runway

RemarksNo. Description Requirement 5 Wingtip clearance of aircraft on interior or secondary peripheral taxilanes (“I”)

6.1 m (20 ft)

Army and Air Force airfields, aircraft with wingspans up to 33.5 m (110 ft), except transient aprons. For V-22 wingtip clearances, see Figure 6-44.

Taxilanes that provide access to individual parking spots or hangars are considered secondary taxi routes.

See note 1 for USAF.

7.7 m (25 ft)

Army and Air Force airfields, transient aprons.

Taxilanes that serve multiple types of aircraft or serve to provide circulation beyond access to individual parking spots or hangars are considered primary facilities.

See note 1 for USAF. For V-22 wingtip clearances, see Figure 6-44.

9.2 m (30 ft)

Army and Air Force airfields, aircraft with wingspans of 33.5 m (110 ft) or more, except transient aprons Taxilanes that serve multiple types of aircraft or serve to provide circulation beyond access to individual parking spots or hangars are considered primary facilities. See note 1 for

USAF.

6 Wingtip clearance of aircraft on through or primary peripheral taxilanes (“T”)

9.2 m (30 ft)

Army and Air Force airfields, aircraft with wingspans up to

33.5 m (110 ft). For V-22 wingtip clearances, see Figure 6-44.

Taxilanes that serve multiple types of aircraft or serve to provide circulation beyond access to individual parking spots or hangars are considered primary facilities.

See note 1 for USAF.

Min 15.3 m (50 ft)

Army and Air Force airfields, aircraft with wingspans of 33.5 m (110 ft) or more Taxilanes that serve multiple types of aircraft or serve to provide circulation beyond access to individual parking spots or hangars are considered primary facilities.

See note 1 for USAF.

Change 1, 5 May 2020

Table 6-1. Fixed-Wing Aprons

Item Class A Runway Class B Runway

RemarksNo. Description Requirement 7 Distance from peripheral taxilane centerline to the outside edge of the apron boundary marking ("C")

7.7 m (25 ft)

Army and Air Force airfields Designed for aircraft with wingspan up to 33.5 m (110 ft). For V-22 wingtip clearances, see Figure 6-44.

11.5 m (37.5 ft)

Army and Air Force airfields Designed for aircraft with wingspan of

33.5 m (110 ft) and greater

8 Clear distance around aircraft during fueling (see paragraph 6-5.7.)

7.7 m (25 ft)

Around aircraft fuel vent outlets (see T.O. 00-25-172).

15.3 m (50 ft)

From a pressurized fuel carrying servicing component (see T.O. 00-25-172).

See Remarks Consider refueling operations when locating taxilanes.

9 Grades in the direction of drainage

Min 0.5% Max 1.5%

Avoid surface drainage patterns with numerous or abrupt grade changes that can produce excessive flexing of aircraft and structural damage.

Lateral and transverse slopes must be combined to derive maximum slope in the direction of drainage.

(i.e., the square root of the transverse slope squared plus longitudinal slope squared is equal to the slope in the direction of drainage.)

For the Air Force, no grade changes are allowed for individual parking positions within the aircraft block dimensions (not including clearance distances) of the design aircraft.

Exceptions are allowed for fuel hydrant pits.

10 Width of shoulders (total width including paved and unpaved)

7.5 m (25 ft)

15 m (50 ft)

Army and Air Force airfields

11 Paved width of shoulders

7.5 m (25 ft)

7.5 m (25 ft)

Army and Air Force airfields not otherwise specified. For apron shoulders where fire hydrants must be installed, see Note 5 and Appendix B, Section 13, for the minimum set back from the taxilane centerline.

Change 1, 5 May 2020

Table 6-1. Fixed-Wing Aprons

Item Class A Runway Class B Runway

RemarksNo. Description Requirement N/A 15 m

(50 ft) Army and Air Force airfields that accommodate B-52, C-5, E-4, and 747 aircraft. For apron shoulders where fire hydrants must be installed, see Note 5 and Appendix B, Section 13, for the minimum set back from the taxilane centerline.

12 Longitudinal grade of shoulders

Variable Conform to longitudinal grade of the abutting primary pavement.

13 Transverse grade of paved shoulder

Min 2.0% Max 4.0%

Army airfields and Air Force airfields not otherwise specified

N/A Min 1.5% Max 2.0%

Air Force airfields that accommodate B-52 aircraft

14 Transverse grade of unpaved shoulders

N/A (a) 40 mm (1.5 in) drop-off at edge of paved shoulder, +/- 13 mm (0.5 in).

(b) 2.0% min, 4.0% max.

Unpaved shoulders shall be graded to provide positive surface drainage away from paved surfaces.

15 Clearance from apron boundary marking to fixed or mobile obstacles

Variable Compute this distance by multiplying

0.5 x the wingspan of the most demanding aircraft that will use the apron and add the appropriate wingtip clearance required by item 5 or 6. Then subtract the distance from the taxilane centerline to the outside edge of the apron boundary marking (item 7) to find the required clear distance.

This distance is to be clear of all fixed and mobile obstacles except as specifically noted in Appendix B, Section 13, even if there is no peripheral taxilane along the edge of apron. This clear distance is required for safety purposes.

NOTES:

1. Light poles are not allowed within this distance without waiver.

2. Implement operational controls to ensure that aircraft larger than the design aircraft do not use the apron without wing-walkers. Publish this information in the airfield operating instruction.

Change 1, 5 May 2020

Table 6-1. Fixed-Wing Aprons

Item Class A Runway Class B Runway

RemarksNo. Description Requirement

3. Submit a revised summary of airfield restrictions to allow update to the AMC Airfield Suitability and Restrictions Report. Mail the revision to:

HQ AMC/A3AS

402 Scott Drive Unit 3A1 Scott AFB IL 62225-5302

16 Grades in cleared area beyond shoulders to fixed or mobile obstacles

(a) 40 mm (1.5 in) drop-off at edge of paved shoulder, +/- 13 mm (0.5 in).

(b) Min 2% Max 10% .

Min 2% Max 10.0%

40 mm (1.5–in) drop-off (+/- 13 mm (0.5 in)) at edge of pavement when the entire shoulder is paved.

When a slope reversal is required within this area, a flat bottom ditch that is graded to drain adequately shall be provided.

NOTES:

1. Air Force wingtip clearances may be reduced to those allowed by AFI 11-218 with a waiver. A waiver will be granted only if no other viable options exist.

2. Metric units apply to new airfield construction and, where practical, to modifications to existing airfields and heliports, as discussed in paragraph 1-3.4.

3. 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.

4. Airfield and heliport imaginary surfaces and safe wingtip clearance dimensions are shown as a direct conversion from inch-pound to SI units.

5. For apron edges where fire hydrants must be installed, widen paved shoulders to within 3 m (10 ft) of the hydrants to allow paved access for firefighting vehicles.

6. N/A = not applicable

6-6 TAXIING CHARACTERISTICS ON APRONS FOR FIXED-WING

AIRCRAFT.

6-6.1 Apron Taxilanes.

Taxi routes across parking aprons, referred to as taxilanes, are marked on the apron for safe passage of the aircraft. Typical taxilane locations are illustrated in Figures 6-1, 6-2 and 6-3. Minimum wingtip clearances between parked and taxiing aircraft are shown in Table 6-1 (see Figure 6-2). AFI 11-218 provides authorization for operating aircraft at reduced clearances under certain circumstances. If a decision is made to reduce clearances based on this authorization, a waiver must be obtained in accordance with Appendix B, Section 1. Waivers should be pursued only when all avenues for compliance have been exhausted.