```

[Federal Register Volume 78, Number 144 (Friday, July 26, 2013)]
[Rules and Regulations]
[Page 45052]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2013-17931]

[[Page 45052]]

=======================================================================
-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 35

[Docket No. FAA-2010-0940-0001; Amdt. No. 35-9A]
RIN 2120-AJ88

Critical Parts for Airplane Propellers; Correction

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Correcting amendment.

-----------------------------------------------------------------------

SUMMARY: The FAA is correcting a final rule published on January 18, 
2013 (78 FR 4038). In that rule, the FAA established airworthiness 
standards for airplane propellers. That action required a safety 
analysis to identify a propeller critical part. Manufacturers would 
identify propeller critical parts, and establish engineering, 
manufacturing, and maintenance processes for propeller critical parts. 
An unintentional error was introduced in Sec.  35.15 when we revised 
paragraph (d). We did not intend to revise paragraph (d). This 
correction will add paragraph (d) to the end of paragraph (c), and 
restore the former paragraph (d).

DATES: Effective July 26, 2013.

FOR FURTHER INFORMATION CONTACT: For technical questions concerning 
this action, contact Jay Turnberg, Engine and Propeller Directorate 
Standards Staff, ANE-111, Federal Aviation Administration, 12 New 
England Executive Park, Burlington, Massachusetts, 01803-5299; 
telephone (781) 238-7116; facsimile (781) 238-7199, email: 
jay.turnberg@faa.gov. For legal questions concerning this action, 
contact Vincent Bennett, FAA Office of the Regional Counsel, ANE-7, 
Federal Aviation Administration, 12 New England Executive Park, 
Burlington, Massachusetts, 01803-5299; telephone (781) 238-7044; 
facsimile (781) 238-7055, email: vincent.bennett@faa.gov.

SUPPLEMENTARY INFORMATION: 

Background

    On January 18, 2013, the FAA published a final rule titled, 
``Critical Parts for Airplane Propellers'' (78 FR 4038).
    In that final rule the FAA revised the regulation to require a 
safety analysis to identify a propeller critical part and require that 
critical parts meet the prescribed integrity specifications of Sec.  
35.16, Propeller critical parts. However, in amending Sec.  35.15 we 
inadvertently revised paragraph (d), when we added the new 
requirements. This was not our intention. This correction will add 
paragraph (d) to the end of paragraph (c), and restore the former 
paragraph (d).

List of Subjects in 14 CFR Part 35

    Air transportation, Aircraft, Aviation safety, Safety.

The Correcting Amendment

    In consideration of the foregoing, the Federal Aviation 
Administration amends chapter I of title 14, Code of Federal 
Regulations as follows:

PART 35--AIRWORTHINESS STANDARDS: PROPELLERS

0
1. The authority citation for part 35 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701-44702, 44704.

0
2. Amend Sec.  35.15 by revising paragraphs (c) and (d) to read as 
follows:

Sec.  35.15  Safety analysis.

* * * * *
    (c) The primary failures of certain single propeller elements (for 
example, blades) cannot be sensibly estimated in numerical terms. If 
the failure of such elements is likely to result in hazardous propeller 
effects, those elements must be identified as propeller critical parts. 
For propeller critical parts, applicants must meet the prescribed 
integrity specifications of Sec.  35.16. These instances must be stated 
in the safety analysis.
    (d) If reliance is placed on a safety system to prevent a failure 
progressing to hazardous propeller effects, the possibility of a safety 
system failure in combination with a basic propeller failure must be 
included in the analysis. Such a safety system may include safety 
devices, instrumentation, early warning devices, maintenance checks, 
and other similar equipment or procedures. If items of the safety 
system are outside the control of the propeller manufacturer, the 
assumptions of the safety analysis with respect to the reliability of 
these parts must be clearly stated in the analysis and identified in 
the propeller installation and operation instructions required under 
Sec.  35.3.
* * * * *
    Issued under authority provided by 49 U.S.C. 106(f), 44701(a), and 
44703 in Washington, DC, on July 19, 2013.

Lirio Liu,
Director, Office of Rulemaking.
[FR Doc. 2013-17931 Filed 7-25-13; 8:45 am]
BILLING CODE 4910-13-P
```