EMASMAX ® – New Developments FAA Technology Transfer Conference April 21-23, 2010 Atlantic City,...

EMASMAX ® – New Developments

FAA Technology Transfer Conference

April 21-23, 2010

Atlantic City, NJ

Presenters:

Dr. Hong Zou – R&D Director

Ms Silvia Valentini – Sr. Tech Advisor

ENGINEERED ARRESTING SYSTEMS CORPORATION

Email: [email protected]

AEROSAFETY & TECHNOLOGY / EMERGENCY ARRESTING SYSTEMS

Successful Arrestment at Yeager Airport 1-19-2010

Courtesy of Yeager Airport


What is EMAS?

A bed of cellular cement blocks placed at the end of a runway to safely decelerate an overrunning aircraft in an emergency

Passive system that will reliably and predictably crush under the weight of an aircraft


EMAS Operation

Material crushes under weight of traversing aircraft.

Tire/material interface provides resistive loads to decelerate the aircraft

Loads are placed on the aircraft landing gear and support structure

Material is engineered to minimize potential for landing gear collapse.


EMAS Characteristics

FAA Advisory Circular AC150/5220-22Up to 70-kt arrestment capabilityThree strength options: 50, 60, and 80Jet Blast Resistant bed components

• Cellular core material• Top surface• Seam seal• Side coating• Vents• Steps

vents

seam seal

side coating

top surface


EMASMAX® Recent Developments


EMAS performance under extreme cold condition

EMAS field strength testing

Part I: Arctic Weather Performance

Part II:

Field Strength Test Method Development


Major Objectives of Cold Climate Testing

Evaluate the long term durability of the EMAS through twenty (20) years of simulated cycling from extreme cold to warm temperatures.

Evaluate the effect of temperature and humidity cycling on EMAS material strength.

Evaluate the effect of extreme cold temperature on plastic top durability.

Evaluate the effect of extreme cold temperature on silicone seal durability and adhesion.


Research was conducted under Cooperative Research and Development Agreement with the FAA.


Thermal cycling simulated 20 yrs arctic weather


Arctic Durability Testing:

An EMAS bed was installed inside a “Room size Environmental Chamber” with Temperature changes between -20ºF to +67ºF.

Cycle: Two weeks into cold and two weeks into warm temperature simulated a 20 yrs exposure to arctic climate.


Details of Installation


Thermocouples were inserted at different height inside some blocks; as well as moisture sensors in the gaps.


Example of a Temperature Record



Infrared Image of Bed Surface During Cold Cycle


-18.8°C

-12.8°C

-18

-16

-14 Block

-- Seam


Evaluate Effect on Core Material StrengthBlock Number Pre-Test Measurement Post-Test Measurement

22302 62.55 60.222303 59.35 73.4522319 65.3 59.3522320 72.8 74.6522321 66.75 78.0022322 73.75 69.822381 83.46 68.922324 55.75 56.2526322 70.25 72.15

Average 67.77 68.08Std. Deviation 8.39 7.66


Post Examination of Core Material Integrity



Evaluate Properties of the Top Surface

0.5 lbs 3.3 lbs


Evaluate Properties of Other Components


Top Material

Seal Tape Caulk


Extreme Cold Weather Testing Summary

“CRREL testing showed that the EMAS system tolerated the cold cycling well, with little change in strength and subsequently little or no change in expected performance. The silicone seals, adhesive, and lid materials also showed little change in durability and performance.

Based on these results, it was concluded that the current EMAS configurations durability, performance, and expected life will not be significantly impacted if installed in an extreme cold weather location and properly maintained.” *

*B.A. Coutermarsh. EMAS Cold Weather Performance Investigations. ERDC/CRREL Letter Report 08-09, October, 2008.



Field Strength Test (FST) Method

FST tolerance band development• Test apparatus and instrumentation• Material selection• Correlations between FST and PTM• FST 60-strength tolerance band

Field testing method• Sample size determination• Random sampling method• Test procedure• Data presentation



Test Apparatus and Instrumentation

In-House Test Apparatus (PTM)

Field Strength Tester (FST)• Temp range: 32~122 ºF• Resolution: 0.2 lb• Ultrasonic distance measurement• Speed indicator• Real-time resistive load curve• Download data to computer for later

analysis



In-House Testing Effort Material Selection

• Hundreds of blocks of various sizes tested

• Cover whole range of production line• Forty EMAS blocks for formal 60-

strength analysis Tested the same samples with PTM

and FST



Correlations between FST and PTM


0% 20% 40% 60% 80% 100%0%

20%

40%

60%

80%

100%

f(x) = 1.00238793811619 x − 0.000725889674021R² = 0.905730377063512

Dimensionless EMAS Block Strength

PTM

FS

T

Significant correlations• Large sample size• High coefficient of

correlation Equivalent to PTM

0.100.050.00-0.05-0.10

9

8

7

6

5

4

3

2

1

0

Strength Difference

Fre

quency

Mean 4.770490E-19StDev 0.05853N 40

Normal

Margin of error


Field Testing Effort in Development Stage


Used to assess conditions of EMAS beds during developmentoBGM, ROC, POU, HYA, LRD, BUR, BTR…

Str

en

gth

Depth

FSTTolerance Band for EMAS 60-strength Blocks


Field Testing Method


Sample size determination• Precision level• Confidence level• Strength variability

Random sampling method Minimal damage to bed Test data presentation S

tre

ng

th

Depth

FST Data at Binghamton RW16 Dep EndTested on 5/23/2008

Average Upper limit Lower limit


FAA Approval on FST Method


Written approval given by the FAA on July 15, 2009

ESCO-ZA’s FST method is ready for use on installed EMAS.

ESCO-ZA’s FST method is currently the only approved method available.



Thank You!

Courtesy of Stantec

EMASMAX ® – New Developments FAA Technology Transfer Conference April 21-23, 2010 Atlantic City,...

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