U.S. Department
%7
of Transportation
Federal Aviation
Administration
Circular
Subject: SPECIFICATION FOR SERIES Date:
07/22/11
AC No: 150/5345-47C
TO SERIES ISOLATION TRANSFORMERS
Initiated
by:
AAS-100
Change:
FOR AIRPORT LIGHTING SYSTEMS
1.
PURPOSE. This advisory circular (AC) contains the Federal Aviation Administration (FAA)
specifications for series to series isolation transformers for use in airport lighting systems.
2.
EFFECTIVE DATE. Effective six months after the issue date of this AC, only that equipment
qualified in accordance with the specifications herein will be listed in accordance with AC 150/5345-53,
Airport
Lighting Equipment Certification
Program.
3.
CANCELLATION. AC 150/5345-47B,
Isolation Transformers
for Airport Lighting
Systems,
dated
June 30, 2005, is cancelled.
4.
APPLICATION. The Federal Aviation Administration (FAA) recommends the guidance and
specifications in this Advisory Circular for isolation transformers. In general, use of this AC is not
mandatory. However, use of this AC is mandatory for all projects funded with federal grant monies
through the Airport Improvement Program
(AIP)
and with revenue from the Passenger Facility Charges
(PFC) Program. See Grant Assurance No. 34,
"'Policies,
Standards, and Specifications," and PFC
Assurance No. 9, "Standards and Specifications." The transformer designs contained in this standard are
a means acceptable to the Administrator to meet the lighting requirements of Title 14 CFR Part 139,
Certification of
Airports,
Section
139.311,
Marking, Signs and Lighting.
5. PRINCIPAL CHANGES. The following principal changes are incorporated:
a. Paragraph
2.3,
ASTM Specification D4247 is withdrawn by ASTM with no replacement.
This specification covers cross-linked polychloroprene compounds suitable for use as outer coverings
or
jackets on electrical cables for general-purpose, black heavy-duty and black extra-heavy-duty
service.
Formerly under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials,
this specification was withdrawn in January 2006. The Executive Committee felt strongly that
Committee D09 could not support the practice of maintaining a standard for which the expertise may
not lie within the current committee membership, or for which the utilization of the standard is
questionable.
b.
Delete Paragraph
3.4.lg
references to ASTM D4247 and 2240. Paragraph is rewritten to allow
the use of thermoplastic elastomers (TPE) and thermoplastic vulcanizates (TPV).
