[Federal Register Volume 80, Number 19 (Thursday, January 29, 2015)]
[Rules and Regulations]
[Pages 4761-4762]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2015-01205]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Parts 25
[Docket No. FAA-2013-0142; Amdt. No. 25-141]
RIN 2120-AK12
Harmonization of Airworthiness Standards--Gust and Maneuver Load
Requirements; Correction
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule; correction.
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SUMMARY: The FAA is correcting the final rule, ``Harmonization of
Airworthiness Standards--Gust and Maneuver Load Requirements'' (79 FR
73462), published December 11, 2014. In the rule, the FAA amended
certain airworthiness regulations for transport category airplanes to
eliminate regulatory differences between the airworthiness standards of
the FAA and European Aviation Safety Agency (EASA). It does not add new
requirements beyond what manufacturers currently meet for EASA
certification and does not affect current industry design practices.
This final rule revises the pitch maneuver design loads criteria;
revises the gust and turbulence design loads criteria; revises the
application of gust loads to engine mounts, high lift devices, and
other control surfaces; adds a ``round-the-clock'' discrete gust
criterion and a multi-axis discrete gust criterion for airplanes
equipped with wing-mounted engines; revises the engine torque loads
criteria; adds an engine failure dynamic load condition; revises the
ground gust design loads criteria; revises the criteria used to
establish the rough air design speed; and requires the establishment of
a rough air Mach number. This document corrects errors in the rule by
ensuring that certain letters in the included equations have the right
formatting and therefore the correct meaning.
DATES: This correction is effective February 9, 2015.
FOR FURTHER INFORMATION CONTACT: For technical questions concerning
this action, contact Todd Martin, Airframe and Cabin Safety Branch,
ANM-115, Transport Airplane Directorate, Aircraft Certification
Service, Federal Aviation Administration, 1601 Lind Avenue SW., Renton,
WA 98057-3356; telephone (425) 227-1178; facsimile (425) 227-1232;
email [email protected].
For legal questions concerning this action, contact Sean Howe,
Office of the Regional Counsel, ANM-7, Federal Aviation Administration,
1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone (425)
227-2591; facsimile (425) 227-1007; email [email protected].
SUPPLEMENTARY INFORMATION:
Background
On December 11, 2014, the FAA published the final rule entitled,
``Harmonization of Airworthiness Standards--Gust and Maneuver Load
Requirements'' (79 FR 73462).
[[Page 4762]]
In the rule, the FAA amended certain airworthiness regulations for
transport category airplanes to eliminate regulatory differences
between the airworthiness standards of the FAA and European Aviation
Safety Agency (EASA). It does not add new requirements beyond what
manufacturers currently meet for EASA certification and does not affect
current industry design practices. This final rule revises the pitch
maneuver design loads criteria; revises the gust and turbulence design
loads criteria; revises the application of gust loads to engine mounts,
high lift devices, and other control surfaces; adds a ``round-the-
clock'' discrete gust criterion and a multi-axis discrete gust
criterion for airplanes equipped with wing-mounted engines; revises the
engine torque loads criteria; adds an engine failure dynamic load
condition; revises the ground gust design loads criteria; revises the
criteria used to establish the rough air design speed; and requires the
establishment of a rough air Mach number.
This document corrects three errors in the Greek letters and
subscripts contained in various equations in the regulatory text. In
one case, the ``U'' in the equation is changed from subscript to
regular, uppercase text. In another case, instead of ``PL =
PL-1g U[sigma]AA'', the
equation should be ``PL = PL-1g
U[sigma]AA''. In two cases, the three Greek letters
``[rho][egr][phis]'' after sigma ``[sigma]'' in the subscript of ``U''
are changed to ``ref''. In these cases,
``U[sigma][rho][egr][phis]'' should be
``U[sigma]ref''.
This correction also corrects the statement in the rule's preamble
that the FAA received 33 comments to the Advisory Circulars, rather
than none.
Corrections
In FR Doc. 2014-28938, beginning on page 73464, in the Federal
Register of December 11, 2014, make the following corrections:
1. On Page 73464, second column, under the heading ``C. Advisory
Material'', the sentence, ``The FAA did not receive any comments on the
proposed ACs'' is corrected to read ``The FAA received 33 comments on
the proposed ACs. These comments did not have an impact on the
regulatory requirements''.
2. On page 73467, second column, line 11, the equation
``PL = PL-1g
U[sigma]AA'' is corrected to read ``PL
= PL-1g U[sigma]AA''.
3. On page 73467, second column, fifth line from the bottom, the
equation ``U[sigma] =
U[sigma][rho][egr][phis]Fg'' is corrected to read
``U[sigma] = U[sigma]ref Fg''.
4. On page 73467, second column, third line from the bottom, the
text ``U[sigma][rho][egr][phis]'' is corrected to read
``U[sigma]ref''.
Issued in Washington, DC, on January 16, 2015.
Lirio Liu,
Director, Office of Rulemaking.
[FR Doc. 2015-01205 Filed 1-28-15; 8:45 am]
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