Overrun

This is an extension of the length of the runway pavement.

Runway overruns keep the probability of serious damage to an aircraft to a minimum in the event that the aircraft runs off the runway end during a takeoff or landing, or lands short during a landing. Overruns are required for the landing and takeoff area. Table 3-4 shows the dimensional requirements for overruns. Overrun profiles are shown in Figure 3-3, and an overrun layout is shown in figures 3-7, 3-10, 3-13, and 3-16. USAF and Army design and construction requirements are covered in UFC 3-260-02 (Chapter 10, under "Special Areas"). Additionally, for all services, manholes, hand holes, and drainage structures constructed within this area should, at a minimum, be designed as provided in this section of the manual. (NOTE: These requirements do not apply to projects already under design prior to the publication date of this manual.) The top surface of foundations should be flush with the grade. Sub-grade structures are not designed to support aircraft wheel loads beyond the paved and unpaved areas of the overrun. Maintenance action is required if the drop-off at the top edge of the foundation exceeds 76 mm (3 in).

The Paved Portion of the Overrun

3-10.1.1 For structures with their shortest span equal to or less than 0.6 m (2 ft), design based on a wheel load of 34,000 kg (75,000 lb) at a contact pressure of 1,724 kPa (250 psi).

3-10.1.2 For structures with their shortest span greater than 0.6 m (2 ft), design based on the maximum number of wheels that can fit onto the span, considering the most critical assigned aircraft operating at its maximum gross weight. In no case, however, should the design be based on computed stress conditions less than those created by a wheel load of 34,000 kg (75,000 lb) at a contact pressure of 1,724 kPa (250 psi).

The Unpaved Portion of the Overrun

3-10.2.1 For structures with their shortest span equal to or less than 0.6 m (2 ft), design based on a wheel load of 22,667 kg (50,000 lb) at a contact pressure of 1,724 kPa (250 psi)

3-10.2.2 For structures with their shortest span greater than 0.6 m (2 ft), design based on the maximum number of wheels that can fit onto the span, considering the most critical assigned aircraft operating at its maximum gross weight. In no case, however, should the design be based on computed stress conditions less than those created by a wheel load of 22,667 kg (50,000 lb) at a contact pressure of 1,724 kPa (250 psi).

Yokota

Vehicles must never stop between the overrun traffic signals.