Page 290 - Planning and Design of Airports

Geometric Design of the Airfield 251

Runway
C L

Taxiway
C L

Runway
C L

Taxiway
C L

FIGURE 6-40 Typical holding pad confi gurations.

designed so that one aircraft can bypass another whenever this is nec-
essary. For piston-engine aircraft the holding apron is an area where
the aircraft instrument and engine operation can be checked prior to
takeoff. The holding apron also provides for a trailing aircraft to
bypass a leading aircraft in case the takeoff clearance of the latter
must be delayed for one reason or another, or if it experiences some
malfunction. There are many configurations of holding aprons, two of
which are shown in Fig. 6-40. The important design criteria are to
provide adequate space for aircraft to maneuver easily onto the run-
way irrespective of the position of adjacent aircraft on the holding
apron and to provide sufficient room for an aircraft to bypass parked
aircraft on the holding apron. The recommendations for the mini-
mum separation between aircraft on holding aprons are the same as
those specified for the taxiway object-free area.
The design of a typical flow-through holding pad studied is
shown in Fig. 6-41. Holding pads must be designed for the largest

Runway
C L

Taxiway
C L

Taxiway
C L
FIGURE 6-41 Flow-through bypass holding pad.