Chapter 5
5.12. Towways. A towway is used to tow aircraft from one location to another.
5.12.1. Dimensions. Table 5.4 presents the criteria for towway layout and design including clearances,
slopes, and grading dimensions.
5.12.2. Layout. A typical transverse cross-section of a towway is shown in Figure 5.6.
5.12.3. Existing Roadway. When existing roads or other pavements are modified for use as towways,
provide for necessary safety clearances, pavement strengthening (if required), and all other specific
requirements set forth in Table 5.4 and Figure 5.6.
5.13. Hangar Access. The pavement which allows access from the apron to the hangar is referred to as a
hangar access apron and is discussed in more detail in Chapter 6.
Table 5.4. Towways.
Class A
Class B
Item
Item
Runway
Runway
No.
Description
Requirement
Remarks
(outside gear width of towed Army and Air Force facilities.
1
Width
mission aircraft)
1.5 m [5 ft] on each side of gear.
+3 m [10 ft]
Navy and Marine Corps facilities for
11 m [36 ft]
carrier aircraft.
Navy and Marine Corps facilities
12 m [40 ft]
for patrol and transport aircraft.
Navy and Marine Corps facilities
10.7 m [35 ft]
for rotary-wing aircraft.
2
Total Width of Shoulders
7.5 m [25 ft]
(paved and unpaved)
3
Paved Shoulder Width
Not Required
4
Longitudinal Grade of
Max 3.0%
Grades may be both positive and
Towway
negative but must not exceed the
limit specified.
5
Rate of Longitudinal Grade
Max 1.0%
The minimum distance between
Change Per
two successive points of
30 m [100 ft]
intersection (PI) is 150 m [500 ft].
Changes are to be accomplished
by means of vertical curves.
NA (See note 1.)
6
Longitudinal Sight
Distance
7
Transverse Grade
Min 2.0%
Pavement crowned at towway
Max 3.0%
centerline.
Slope pavement downward from
5-14
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