Page 260 - Planning and Design of Airports

Geometric Design of the Airfield 223

OBSTACLE RUNWAY

INTERMEDIATE FINAL MISSED APPROACH RE-ENTER ENROUTE
INITIAL
PHASE
PLAN
1000' FLIGHT PATH MAP 1000'
500'
PROFILE

PROJECTED VIEW

FIGURE 6-28 Typical TERPS procedure segments.

on the above standards and the existing terrain and obstacle environ-
ment for any given runway, as illustrated in Fig. 6-28.
It is widely understood that protecting airspace for TERPS is a
complex process, often unique to each airport. For planning purposes,
however, a slope with 40:1 gradient and 15° from the runway end
should be considered as TERPS obstacle clearance surface criteria.
Runways with the intention of being supported by published instru-
ment procedures should be designed in such a manner to avoid any
natural or man-made obstacles that penetrate this surface. Once a
runway exists, airport planners should work to ensure that future
development does not conflict with TERPS or FAR Part 77 obstacle
clearance requirements.

Runway End Siting Requirements
The specifications for determining obstacles to safe air navigation
to existing runways are described in FAR Part 77 and TERPS pro-
cedures. However, when locating, or siting a runway, the FAA pre-
scribes a different, yet complimentary set of specifications. These
specifications are published in Appendix 2 of Advisory Circular AC
150/5300-13, identified in Table 6-17, and illustrated in Figs. 6-29
through 6-31.