[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