+-----------------------------------+-----------------------------------+
| ![](media/image1.w                | **Advisory**                      |
| mf){width="0.37430555555555556in" |                                   |
| height="0.375in"}                 | **Circular**                      |
|                                   |                                   |
| U.S. Department\                  |                                   |
| of Transportation                 |                                   |
|                                   |                                   |
| **Federal Aviation\               |                                   |
| Administration**                  |                                   |
+-----------------------------------+-----------------------------------+

+-----------------------------------+---------------+-----------------+
| **Subject:** Change 8 to          | **Date:**     | **AC No:**      |
| MEASUREMENT, CONSTRUCTION, AND    | 2/7/07        | 150/5320-12C    |
| MAINTENANCE OF SKID-RESISTANT     |               |                 |
| AIRPORT PAVEMENT SURFACES         | **Initiated   | **Change:** 8   |
|                                   | by:** AAS-100 |                 |
+-----------------------------------+---------------+-----------------+

1.  **PURPOSE.** This change updates information regarding FAA qualified
    Continuous Friction Measuring Equipment.

**2. PRINCIPAL CHANGES.** The following editorial changes have been
made:

> **a.** Appendix 4. Changes have been made to reflect updated
> information for manufacturers.

PAGE CONTROL CHART

+----------------+-----------------+-----------------+-----------------+
| Remove Pages   | Dated           | Insert Pages    | Dated           |
+----------------+-----------------+-----------------+-----------------+
| Appendix 4     | 12/05/05        | Appendix 4      | 02/07/07        |
|                |                 |                 |                 |
| pg. 1 (and 2)  |                 | pg. 1 (and 2)   |                 |
+----------------+-----------------+-----------------+-----------------+

![](media/image2.png){width="2.5034722222222223in"
height="0.5847222222222223in"}

DAVID L. BENNETT

Director, Office of Airport Safety

and Standards

# APPENDIX 4. FAA APPROVED CFME

+-----------------------------------------------------------------------+
| ## AIRPORT                                                            |
| SURFACE FRICTION TESTER INDUSTRIES AB AIRPORT SURFACE FRICTION TESTER |
|                                                                       |
| Metallgatan 7 +46 0 411 651 00                                        |
|                                                                       |
| 271 39 Ystad, Sweden FAX +46 0 411 190 12                             |
|                                                                       |
| SWEDEN email: sales@asft.se                                           |
+-----------------------------------------------------------------------+
| ### AIRPORT TECHNOLOGY USA SAFEGATE FRICTION TESTER                   |
|                                                                       |
| NO LONGER AVAILABLE                                                   |
+-----------------------------------------------------------------------+
| ### DOUGLAS EQUIPMENT LTD MU METER                                    |
|                                                                       |
| Douglas House, Village Road +44 1242 531219                           |
|                                                                       |
| Arle, Cheltenham FAX +44 1242 571667                                  |
|                                                                       |
| Gloucestershire email: spd@douglas-equipment.com                      |
|                                                                       |
| GL51 0AB UK                                                           |
+-----------------------------------------------------------------------+
| **DYNATEST CONSULTING, INC., RUNWAY FRICTION TESTER (6810, 6850 and   |
| 6875)**                                                               |
|                                                                       |
| **(FORMERLY K.J. LAW ENGINEERS, INC**.) +(904) 964-3777               |
|                                                                       |
| 13952 US Highway 301 South FAX +(904) 964-3749                        |
|                                                                       |
| Starke, FL 32091                                                      |
+-----------------------------------------------------------------------+
| **FINDLAY, IRVINE, LTD. GRIPTESTER FRICTION TESTER**                  |
|                                                                       |
| 42-44 Bog Road, Penicuik +44 1968 672111                              |
|                                                                       |
| Midlothian EH 26 9 BU FAX +44 1968 671237                             |
|                                                                       |
| SCOTLAND www.findlayirvine.com                                        |
+-----------------------------------------------------------------------+
| **INTERTECH ENGINEERING** **TATRA FRICTION TESTER**                   |
|                                                                       |
| NO LONGER AVAILABLE                                                   |
+-----------------------------------------------------------------------+
| ### NEUBERT AERO CORP. NAC DYNAMIC FRICTION TESTER                    |
|                                                                       |
| 4105 West De Leon Street +(727) 538-8744                              |
|                                                                       |
| Tampa, FL 33609 FAX +(727) 538-8765                                   |
|                                                                       |
| email: info@airportnac.com                                            |
|                                                                       |
| www.airportnac.com                                                    |
+-----------------------------------------------------------------------+
| **NORSEMETER RUNAR RUNWAY ANALYSER AND RECORDER**                     |
|                                                                       |
| P. O. Box 125 +47 23 20 1270                                          |
|                                                                       |
| Bogstadvien FAX +47 23 20 1271                                        |
|                                                                       |
| 0323 0310                                                             |
|                                                                       |
| NORWAY                                                                |
+-----------------------------------------------------------------------+
| **PATRIA VAMMAS AEC BV-11 SKIDDOMETER**                               |
|                                                                       |
| P.O. Box 18 Vammaksentie +358 20 4694041                              |
|                                                                       |
| FIN-38201 Vammala FAX +358 20 4694250                                 |
|                                                                       |
| FINLAND www.patria.fi                                                 |
+-----------------------------------------------------------------------+
| **SCANDINAVIAN AIRPORT AND ROAD SYSTEMS AB SARSYS FRICTION TESTER     |
| (SFT)**                                                               |
|                                                                       |
| Box 31, Sjoviksvagen 4 **SARSYS TRAILER FRICTION TESTER (STFT)**      |
|                                                                       |
| 23121 Trelleborg **SARSYS SUV FRICTION TESTER (SSUV)**                |
|                                                                       |
| SWEDEN +46 410 46 110                                                 |
|                                                                       |
| FAX +46 410 46 111                                                    |
|                                                                       |
| US/Canada Tradewind Scientific Ltd. www.tradewindscientific.com       |
+-----------------------------------------------------------------------+
|                                                                       |
+-----------------------------------------------------------------------+