Code of Maryland Regulations
Title 11 - DEPARTMENT OF TRANSPORTATION
Subtitle 03 - MARYLAND AVIATION ADMINISTRATION
Chapter 11.03.05 - Obstructions to Air Navigation
Section 11.03.05.04 - Obstruction Standards
Current through Register Vol. 51, No. 6, March 22, 2024
A. An obstruction is a hazard to air navigation if it:
B. For the purpose of this chapter, airport runways are classified as follows:
Table 1: Runway Classifications
Type of Runway | Classification |
Utility Runway: | |
Visual approaches only | I |
With nonprecision instrument approach | II |
Runway with greater than utility capacity-visual approaches only | III |
Runway with greater than utility capacity and a nonprecision instrument approach with visibility minimum greater than 3/4 statute mile | IV |
Precision instrument approach or nonprecision approach and visibility minimum of 3/4 statute mile or less | V |
Precision instrument runway using an Instrument Landing System (ILS)or a Precision Approach Radar (PAR) | VI |
C. Imaginary Surfaces.
D. Each imaginary surface shall be determined in the following manner:
Runway Classification | Width |
I | 250 feet |
II, III, IV | 500 feet |
V, VI | 1,000 feet |
Runway Classification | Radius |
I, II, III | 5,000 feet |
IV, V, VI | 10,000 feet |
E. To provide clearance for mobile objects operating on traverse ways on or near a public-use airport that does not have an operative ground traffic control service coordinated with the air traffic control service, the actual height of the traverse way shall be adjusted upwards by the following amounts:
Type of Traverse Way | Increase in Height |
Interstate highway | 17 feet |
Other public roadways | 15 feet |
Private roadways | The greater of 10 feet or the height of the highest mobile object that would normally use the roadway |
Railroads | 23 feet |
Other traverse ways, including waterways | The height of the highest mobile object that would normally use the traverse way |
Table 2: Dimensions of Approach Surface*
Runway Class | Description | Width of Inner Edge | Width of Outer Edge | Horizontal Length | Slope Angle |
I | Utility runway; visual approaches only | 250 ft. | 1,250 ft. | 5,000 ft. | 20 to 1 |
II | Utility runway; nonprecision approach | 500 ft. | 2,000 ft. | 5,000 ft. | 20 to 1 |
III | Runway with greater than utility capacity;visual approaches only | 500 ft. | 1,500 ft. | 5,000 ft. | 20 to 1 |
IV | Runway with greater than utility capacity; nonprecision approach with visibility minimumsgreater than 3/4 statute mile | 500 ft. | 3,500 ft. | 10,000 ft. | 34 to 1 |
V | Runway with greater than utility capacity; nonprecision approach with visibility minimums as low as 3/4 statute mile | 1,000 ft. | 4,000 ft. | 10,000 ft. | 34 to 1 |
VI | Precision instrument runway using either an Instrument Landing System | 1,000 ft. | 16,000 ft. | 10,000 ft. plus 40,000 ft. | 50 to 1 |
(ILS) or Precision Radar Approach (PAR) | 40 to 1 |
* The inner edge of the approach surface is equal to, and abuts, the primary surface