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granted by the delivery of this document or the disclosure of
its content. This document shall not be reproduced or
disclosed to a third party without the express written consent
of AIRBUS S.A.S. This document and its content shall not be
used for any purpose other than that for which it is supplied.
The statements made herein do not constitute an offer. They
are based on the mentioned assumptions and are expressed
in good faith. Where the supporting grounds for these
statements are not shown, AIRBUS S.A.S. will be pleased to
explain the basis thereof.
AIRBUS, its logo, A300, A310, A318, A319, A320, A321,
A330, A340, A350, A380, A400M are registered trademarks.
CUSTOMER SERVICES DIRECTORATE AIRBUS
1 ROND POINT MAURICE BELLONTE
31707 BLAGNAC CEDEX FRANCE
TELEPHONE + 33 (5) 61 93 33 33
TELEX AIRBU 530526F SERVICE INFORMATION LETTER
SIL NUMBER: 20-017
PAGE: 1 of 3
DATE: June 28/2004
REVISION:
SUBJECT:
ATA CHAPTER:
AIRCRAFT TYPE:
APPLICABILITY:
1. PURPOSE:
A300, A300-600, A310, A318, A319, A320, A321, A330, A340, A340-500/600
20-00
ALL
REFERENCES: - OIT AI/SE-E 999.0071/02 dated 24 July 2002
- FAA Report DOT/FAA/AR-01/118 dated November 2002
- SIL 20-013
- Electrical Standard Practices Manual (ESPM) – Chapter 20
AGING OF CIRCUIT BREAKERS
The above referenced OIT provided a description of the background of Aging Transport
Systems Rulemaking Advisory Committee (ATSRAC) and FAA Enhanced Airworthiness
Program for Airplane Systems (EAPAS).
As a complement to the referenced OIT concerning the results of the ATSRAC Tasks, this
SIL is intended to provide additional information on the FAA Aging Electrical Systems
Research Program and particularly on the Aging Circuit Breaker study.
AIRBUS
SERVICE INFORMATION LETTER
SIL NUMBER: 20-017
PAGE: 2 of 3
DATE: June 28/2004
REVISION:
2. BACKGROUND
The EAPAS is an overall program that outlines the recommendations of the ATSRAC but
is also intended to focus on all aircraft systems, including mechanical systems. The
current focus of this program revolves around aging wiring systems and provides
strategies for how the FAA and industry will work to improve the airworthiness of wire
systems through near-term and long-term actions, with the intent to disseminate the
outcomes throughout the industry.
The EAPAS also includes an extensive Aging Electrical System Research Program. This
program is intended to conduct research into aging wiring systems to determine
mechanisms that drive the aging process, develop tools to better inspect and maintain
wiring, and develop technologies that mitigate the hazards associated with wiring failure.
3. DESCRIPTION
As part of the Aging Electrical System Research Program, the FAA sponsored a test
program to evaluate the performance of circuit breakers removed from some retired
large transport aircraft (B727 and DC-10 aircraft) and issued in November 2002 a report
ref. DOT/FAA/AR-01/118 to disseminate the results of this study.
The purpose of this test was to provide data needed to determine to what extent circuit
breakers removed from retired aircraft have degraded from their original performance
specification parameters. The test program encompassed visual and X-Ray
examination, voltage drop test, current overload test, insulation resistance test and
failure analysis.
Results indicated that circuit breakers installed on aircraft with extended service life would
continue to protect the electrical wire provided that adequate attention is placed on the
need to control circuit breaker aging characteristics throughout their life. The report makes
several recommendations aiming at improving the reliability of circuit breakers, and
reducing maintenance related problems, including:
- Cycle circuit breakers periodically with no power,
- Need for instructions to protect the back of circuit breaker panels during routine
maintenance,
- Need for instructions on cleaning the back of circuit breaker panels,
- Need to inspect circuit breaker panels for loose, broken or misapplied wire termination
hardware,
- Need to inspect circuit breakers for overheating and arcing,
- Need for instructions to use the correct wire termination hardware,
The FAA is now considering the results of this test program and more particularly the
benefits of thermal circuit breaker cycling.
AIRBUS
SERVICE INFORMATION LETTER
SIL NUMBER: 20-017
PAGE: 3 of 3
DATE: June 28/2004
REVISION:
4. AIRBUS ACTION
Even if the circuit breakers used during the test program were not removed from Airbus
aircraft, Airbus have reviewed the results and recommendations for potential application on
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