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• Aircraft Age-Related Degradation Study
on Single- and Three-Phase Circuit
Breakers
• Available at: actlibrary.tc.faa.gov
• Report contains detailed results and
recommendations
Aging Circuit Breaker
Recommendations
• Maintenance Manual: Review and
update
– Cycle all breakers off/on at least
annually
– Instructions on protecting the back of
c.b. panels during routine maintenance
– Instructions on cleaning back of c.b.
panels
Aging Circuit Breaker
Recommendations
• Maintenance Manual: Review and
update
– Instructions to examine c.b. panels for
loose, broken, misapplied termination
hardware and corrective procedures
– Instructions to avoid cross-threading
screws or thread-stripping terminals
and require replacement of c.b. when
this occurs
Aging Circuit Breaker
Recommendations
• Maintenance Manual: Review and
update
– Instructions to inspect for
overheating and electrical arcing
– Instructions clearly specifying
correct wire-termination hardware.
No substitutions permitted.
Aging Circuit Breaker
Recommendations
• Maintenance Manual: Review and
update
– Review all processes that use the c.b.
as the primary on/off switch.
– Breakers routinely used for this
purpose shall be scheduled for
replacement based upon design
requirements for the breaker, or the
circuit shall be redesigned with an
appropriate switching device.
Aging Circuit Breaker
Recommendations
• SAE Standards: ARP 1199
– Recommend c.b. termination hardware
be replaced with identical parts.
– Standardize date code marking
– Revise ARP 1199 and ARP 4404 to
include definitive guidelines related to
multiple circuits powered by a single
c.b.
Aging Circuit Breaker
Recommendations
• SAE Standards:
– Revise AS 50881 & AS 5809 to
develop guidelines on multiple
wires terminated into one-lug
attached to c.b. terminal and
multiple-lugs attached to a c.b.
Aging Circuit Breaker
Recommendations
• FAA Advisory Circulars:
– Recommend that relevant AC’s
refer to SAE ARP 1199, ARP
4404, and AS 50881 for electrical
distribution system guidance.
Aging Circuit Breaker
Recommendations
R&D Results, Recommendations,
and Products
Technology Transfer/Implementation
???
ATSRAC
Technology Transfer/Implementation
• FAA provides quarterly R&D
reviews to ATSRAC
• Information exchange
• Research partnerships and
cooperation
Tech Xfr/Implementation
• As EWIS rulemaking activities
proceed establish a means to explore
implementation of R&D products
and knowledge
• Supports development of guidance,
implementation, and technology
transfer.
Tech Xfr/Implementation
Outputs:
• Liaison with ATSRAC membership
concerning implementation of R&D
products within the industry
Tech Xfr/Implementation
Outputs:
• Provide recommendations and
comment to the FAA R&D program
concerning implementation and
potential additions, changes, or
deletion of R&D that would enhance
the implementation process
Tech Xfr/Implementation
Outputs:
• Recommend additions, changes, or
deletion of implementation methods
Tech Xfr/Implementation
Outputs:
• Provide an interface between the FAA
R&D program and the ATSRAC
membership.
• Facilitate R&D cooperation and/or
partnerships
• Facilitate transfer of technology to
aviation community
Tech Xfr/Implementation
Wire Test & Inspection
Technology
Excited Dielectric Test Wire Indenter
Optical Chafe Detector
Validation Test Bed
Hi-Voltage Micro-Energy
Complete: March 2003
Broadband Impedance Measurement
Complete: May 2004
Terahertz Reflectometry
Complete: March 2004
Complete: July 2004
Complete: November 2003
Pulsed Arrested Spark Discharge
Complete: September 2005
Pseudo-Random Binary
Sequence Reflectometry
Complete: December 2004
Wire Degradation Research
Wire Degradation Research
• Test Data and Preliminary Age Models
April 2004
• Draft Final Report
August 2004
• Final Report
December 2004
Evaluation of Performance Requirements,
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