# Presentation: 681023

## FAA PERSPECTIVE 

***Airfield Pavement Roughness***

- Presentation to:  ASTM E17 Committee Mini-SeminarName:  Rodney Joel - Airport Engineering DivisionDate:  Dec. 5, 2006

## FAA Guidance - Pavement Profile

- _NEW CONSTRUCTION_
- 	AC 150/5300-13, Airport Design
- Surface Gradient
- Maximum grade allowance
- Change in grade provisions
- 	AC 150/5370-10B, Standards for Specifying Construction of Airports
- Construction Tolerances
- Acceptance Criteria

## FAA Guidance - Pavement Profile

- AC 150/5300-13, Airport Design
- 	_Category C & D airports_
- 		_+_1.5 percent - Max longitudinal grade
- (_+_0.8 percent in first and last quarter of runway)
- 		_+_1.5 percent - Max grade change
-  		Parabolic vertical curves 1,000 ft each 1 percent change
- 		1,000 ft - Min distance between points of intersection
- Relaxed for category A & B airports

## FAA Guidance - Pavement Profile

- Longitudinal Grade – Category C & D Airports

- 0% to 0.8%

- End 1⁄4 Runway

- 0% to 1.5%

- Vert.CurveLength

- Vert.CurveLength

- Grade Change

- Distance Between Grade Change

- Minimum (1000 ft) x (sum of grade change)

- Minimum length – 1000 ft x grade change

- 0% to 1.5%

- P.C.

- P.T.

## FAA Guidance - Pavement Profile

- Transverse Grade – Category C & D Airports

- 1.0 % to 1.5 %

- Runway Width

- 1.0% to 1.5%

## FAA Guidance - Pavement Profile

- AC 5370-10B, Item** P-401** Plant Mix Bituminous Pavements
- Grade – 	not exceed 1⁄2 inch at any point
- Smoothness	Finished Surface   < 1⁄4 inch in 16 feet
- 			Reject if more than 15% exceed criteria
- 			Optional Profilograph

## FAA Guidance - Pavement Profile

- AC 5370-10B, Item **P-501** Portland Cement Concrete Pavement
- Grade 	 	not exceed 0.4 inch (12mm) at any point
- Smoothness	Finished Surface   < 1⁄4 inch in 16 feet
- 			Reject if more than 15% exceed criteria
- 			Optional Profilograph

## FAA Guidance - Pavement Profile

- When tolerances are within the quality limits specified,experience has shown that the current FAA grade and straightedge criteria provides pavements that are safe for aircraft operations with regards to accelerated gear load, fatigue damage, pitch & roll, and cockpit g-forces.
- This criteria may not address isolated exceptions such as harmonic oscillations

## FAA Guidance - Pavement Profile

***FAA Guidance - Pavement Profile***

- BOEING BUMP(appears to address gear load issues for a single event)
- Meeting the FAA design and construction criteria (0.25” per 16’) or the ICAO (3mm per 3 m) criteria produces pavements which are safe for aircraft operations

## Pavement Roughness

- EVALUATION OF EXISTING PAVEMENTS
- There are several tools and methods to measure and evaluate a pavement profile.
- Parameters under consideration include:
- 	Boeing Bump
- 	CG or Gear Acceleration (aircraft response)
- 	IRI
- 	Bandpass Filters
- 	Power Spectral Density
-   ETC...

## Pavement Roughness

- EVALUATION OF EXISTING PAVEMENTS
- _There is no industry standard which clearly defines when an airport pavement has become “too rough”_
- Problems can be aircraft specific
- New Construction criteria is not applied
- Action is initiated by pilot complaints

## Pavement Roughness – Existing Facilities

***Pavement Roughness – Existing Facilities***

## Pavement Roughness – What Next?

-  FAA Tech Center – Airport Pavement Roughness Criteria
- “develop practical procedures for measuring and characterizing the roughness of runways and taxiways”
- Simulator Study
- Dr. Hayhoe will discuss
- Industry Efforts ??