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2Federal AviationAdministration

FAA Pavement Grooving RequirementsApril 2010

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Presentation Outline FAA Rationale for Groove Requirements

Previous FAA Pavement Grooving

Standards

Current FAA Pavement Grooving Standards

Groove Measuring Methods

Comparison of Manual versus AutomatedGroove Measurements

Summary Acknowledgements

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FAA Airport Pavement Grooving

Requirements

Paragraph 2-15 of FAA AC 150/5320-12C

states: Cutting or forming grooves inexisting or new pavement is a proven andeffective technique for providing skid-resistance and prevention of hydroplaning

during wet weather. Grooving of all runways,.. serving ..turbojet

aircraft, is considered high priority safety

work and should be accomplished duringinitial construction.

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FAA Airport Pavement Grooving

Requirements, cont.

Paragraph 2-16 of FAA AC 150/5320-12C suggests

considering the following for other runways:- History of aircraft hydroplaning,

- annual rainfall rates and intensity,

- surface abnormalities impeding runoff,

- surface texture such as contaminant,

- crosswind effects,

- dropoffs at the end of the runway safety areas,

etc.

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FAA Pavement Grooving RequirementsApril 2010

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Previous FAA Groove Standards

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FAA Pavement Grooving RequirementsApril 2010

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Current FAA Groove Standards

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FAA Pavement Grooving RequirementsApril 2010

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Field Measuring of Pavement Grooves

In September 2008, representatives from aUS airport contacted the FAA to help

resolve a dispute between the airport and acontractor constructing a runway. Thedispute centered on whether the contractor

saw-cut the grooves in rigid pavementaccording to the AC.

The challenge to the FAA was to determine

an appropriate method of measuring theconstructed grooves for compliance with

the AC.

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Field Measuring of Pavement Grooves

Furnish a grooving profiling procedure ofthe runway.

This procedure would have to determine thenecessary sample size to ensure astatistically significant confidence level.

A 12,000 ft. runway can have approximately95,000 grooves, this procedure had toaccommodate a similar population.

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FAA Pavement Grooving RequirementsApril 2010 9

Groove Measurement Methods Two methods were identified;

a manual method measuring the depth,width, and separation of individual groovesusing a depth gage and calipers and,

a method using a laser displacement sensoraffixed to a passenger vehicle.

both methods were compared to each other

on the same slab and in the same line.

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FAA Pavement Grooving RequirementsApril 2010 10

Manual Groove Measurement

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FAA Pavement Grooving RequirementsApril 2010 12

Manual Depth Gage Measurements

Groove Measurement Worksheet

Distance Depth by Depth byGroove Between Width Gage SELCOM

Number (in.) (in.) (in.) ProFAA

(in.)

01 1.306 0.159 0.1872 0.1638

2 1.321 0.17 0.1806 0.1615

3 1.314 0.186 0.1786 0.1649

4 1.322 0.177 0.1705 0.1706

5 1.322 0.175 0.1472 0.1367

6 1.314 0.185 0.1308 0.1163

7 1.306 0.187 0.1489 0.1468

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FAA Pavement Grooving RequirementsApril 2010 13

Laser Groove Measurement

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FAA Pavement Grooving RequirementsApril 2010 14

Laser Displacement Sensor

Specifications

Manufacturer/Model: LMI Selcom 2207-

200/325 Spot size: 0.04 in (1mm)

Range: 8 in. (200mm)

Resolution: 0.002 in (0.049mm) (12 bits) Primary sample rate: 32 kHz

Storage sample rate: 8 kHz (11 samples/in at

40 mph) New system samples and stores at 64 kHz

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ProGroove Grooving Data

A 13,000 ftrunway has

about

104,000grooves.

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Example Groove PlotsExample zoomed plot over about 35 feet.

Close-up zoomed plot of standard grooves.

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Comparison of ProGroove and Manual Groove

Calculation at ACY Runway 4ACY Grooves S to N

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

1 14 27 40 53 66 79 92 105 118 131 144 157 170 183

Groove Number

Groove

Depth,

in

Depth Gauge

SELCOM

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Current FAA Pavement Grooving

Requirements Instruments for measuring groove width

and depth must have a range of at least 0.5

inches and a resolution of at least 0.005inches. Gage blocks or gages machined to

standard grooves width, depth, and spacing

may be used. Instruments for measuring center-to-center

spacing must have a range of at least 3.0

inches and a resolution of at least 0.02inches.

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Current FAA Pavement Grooving

Requirements

The Engineer will measure grooves in five

zones across the pavement width.Measurements will be made at least THREE

times during each days production.Measurements in all zones will be made foreach cutting head on each piece ofgrooving equipment used for each daysproduction.

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Current FAA Pavement Grooving

Requirements The five zones are as follows:

Zone 1 Centerline to 5 feet left or right of the centerline. Zone 2 5 feet to 25 feet left of the centerline.

Zone 3 5 feet 25 feet right of the centerline. Zone 4 25 feet to edge of grooving left of the centerline. Zone 5 25 feet to edge of grooving right of the centerline.

Width or depth measurements less than 0.170 inches shall beconsidered less than 3/16 inches.

Width or depth measurements more than 0.330 inches shallbe considered more than 5/16 inches.

Width or depth measurements more than 0.235 inches shallbe considered more than 1/4 inches.

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Comparison of Previous and Current

Groove Standards

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Current Groove Measurement

Methodology

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Summary

The revision to FAA AC 150/5370-10E,Standards for Specifying Construction of

Airports, dated 9/30/2009 clarifies thefollowing grooving requirements:

- combined rigid and flexible in one section,

- established criteria for acceptance testingequipment and the procedure for groove

measurement in the field for acceptance,

- augmented existing PWL acceptancestandards for pavement grooving.

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Acknowledgements

Mr. Jeffrey Rapol, AAS-100

SRA International