[Federal Register Volume 63, Number 192 (Monday, October 5, 1998)]
[Notices]
[Pages 53484-53485]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-26612]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
Proposed Advisory Circular (AC) 25.1419-1X, Certification of
Transport Category Airplanes for Flight in Icing Conditions
AGENCY: Federal Aviation Administration, DOT.
ACTION: Notice of proposed advisory circular.
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SUMMARY: The Federal Aviation Administration invites public comment on
a proposed Advisory Circular (AC) which provides guidance for
certification of airframe ice protection systems on transport category
airplanes.
DATES: December 4, 1998.
ADDRESSES: Send all comments on the proposed AC to: Kathi Ishimaru,
Propulsion/Mechanical Systems/Crashworthiness Branch, ANM-112, FAA
Transport Airplane Directorate, Aircraft Certification Service, 1601
Lind Ave SW., Renton, WA 98055-4056.
FOR FURTHER INFORMATION CONTACT: Katherine Burks, Regulations Branch,
ANM-114, FAA Transport Airplane Directorate, Aircraft Certification
Service, 1601 Lind Ave SW., Renton, WA 98055-4056; telephone (425) 227-
2114.
SUPPLEMENTARY INFORMATION:
Comments Invited
A copy of the subject AC may be obtained by contacting the person
named above under FOR FURTHER INFORMATION CONTACT. Interested persons
are invited to comment on the proposed AC by submitting such written
data, views, or arguments as they may desire. Commenters must identify
the title of the AC and submit comments in duplicate to the address
specified above. All comments on or before the closing date for
comments will be considered by the Transport Airplane Directorate
before issuing the final AC.
[[Page 53485]]
Discussion
If certification for flight in icing conditions is desired, an
applicant must demonstrate that the airplane can safely operate through
the icing envelope of 14 CFR part 25, Appendix C. Sections 25.1419 sets
forth the specific airframe requirements for demonstrating compliance
with the icing conditions defined in Appendix C. To provide guidance to
applicants seeking approval of the installation and operation of ice
protections systems in the icing environment, the FAA has developed
guidance material in the form of a draft advisory circular (AC 25.1419-
1X). While the primary focus of this draft AC pertains to the
certification of airframe ice protection systems on transport category,
it also supplements similar guidance provided in other AC's concerning
icing requirements for other parts of the airplane (i.e., engine,
engine inlet, propeller). Examples of the type of guidance provided in
this AC include:
1. Development of a certification plan.
2. Analyses (e.g., flutter, similarity, failure, etc.) to
substantiate decisions involving the application of selected ice
protection equipment, including areas and components to be protected.
3. Dry air ground tests.
4. Flight test planning.
5. Compliance tests, including dry air flight tests with ice
protection equipment installed and with predicted artificial ice shapes
installed, as well as flight tests in both natural icing and simulated
icing conditions.
6. Placards necessary for safe operation of the airplane in an
icing environment.
7. Airplane Flight Manual pilot information needed to operate the
ice protection system.
The guidance provided in this AC is applicable to new Type
Certificates (TC's) Supplemental Type Certificates (STC's), and
amendments to existing TC's for airplanes certified under part 4b of
the Civil Aviation Requirements (CAR) and part 25, for which approval
under the provisions of Sec. 25.1419 is desired.
John J. Hickey,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service, ANM-100.
[FR Doc. 98-26612 Filed 10-2-98; 8:45 am]
BILLING CODE 4910-13-M
