Harmonization of Various Airworthiness Standards for Transport Category Airplanes-Flight Rules, 70854-70861 [2010-29193]

Agencies

• Federal Aviation Administration
• DEPARTMENT OF TRANSPORTATION

[Federal Register Volume 75, Number 223 (Friday, November 19, 2010)]
[Proposed Rules]
[Pages 70854-70861]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-29193]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2010-0310; Notice No. 10-17]
RIN 2120-AJ72


Harmonization of Various Airworthiness Standards for Transport 
Category Airplanes--Flight Rules

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to amend various airworthiness standards for 
transport category airplanes. This action would harmonize the 
requirements for takeoff speeds, static lateral-directional stability, 
speed increase and recovery characteristics, and the stall warning 
margin for the landing configuration in icing conditions with the 
European Aviation Safety Agency (EASA) certification standards. When 
airplanes are type certificated to both sets of standards, differences 
between the standards can result in additional costs to manufacturers 
and operators. Adopting this proposal would harmonize regulatory 
differences for the items noted above between United States (U.S.) and 
EASA airworthiness standards.

DATES: Send your comments on or before February 17, 2011.

ADDRESSES: You may send comments identified by Docket Number FAA-2010-
0310 using any of the following methods:
     Federal eRulemaking Portal: Go to https://www.regulations.gov and follow the online instructions for sending your 
comments electronically.
     Mail: Send comments to Docket Operations, M-30; U.S. 
Department of Transportation, 1200 New Jersey Avenue, SE., Room W12-
140, West Building Ground Floor, Washington, DC 20590-0001.
     Hand Delivery or Courier: Take comments to Docket 
Operations in Room W12-140 of the West Building Ground Floor at 1200 
New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
     Fax: Fax comments to Docket Operations at 202-493-2251.
    For more information on the rulemaking process, see the 
SUPPLEMENTARY INFORMATION section of this document.
    Privacy: We will post all comments we receive, without change, to 
https://www.regulations.gov, including any personal information you 
provide. Using the search function of our docket web site, anyone can 
find and read the electronic form of all comments received into any of 
our dockets, including the name of the individual sending the comment 
(or signing the comment for an association, business, labor union, 
etc.). You may review DOT's complete Privacy Act Statement in the 
Federal Register published on April 11, 2000 (65 FR 19477-78) or you 
may visit https://DocketsInfo.dot.gov.
    Docket: To read background documents or comments received, go to 
https://www.regulations.gov at any time and follow the online 
instructions for accessing the docket, or go to the Docket Operations 
in Room W12-140 of the West Building Ground Floor at 1200 New Jersey 
Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through 
Friday, except Federal holidays.

FOR FURTHER INFORMATION CONTACT: For technical questions concerning 
this proposed rule contact Don Stimson, FAA, Airplane & Flight Crew 
Interface Branch, ANM-111, Transport Airplane Directorate, Aircraft 
Certification Service, 1601 Lind Avenue, SW., Renton, WA 98057-3356; 
telephone (425) 227-1129; facsimile (425) 227-1149, e-mail 
Don.Stimson@faa.gov.
    For legal questions about this proposed rule, contact Doug 
Anderson, FAA, Office of the Regional Counsel (ANM-7), 1601 Lind 
Avenue, SW., Renton, Washington 98057-3356; telephone (425) 227-2166; 
facsimile (425) 227-1007; e-mail Douglas.Anderson@faa.gov.

SUPPLEMENTARY INFORMATION: Later in this preamble, under the Additional 
Information section, we discuss how you can comment on this proposal 
and how we will handle your comments. Included in this discussion is 
related information about the docket, privacy, and the handling of 
proprietary or confidential business information. We also discuss how 
you can get a copy of this proposal and related rulemaking documents. 
Appendix 1 of this NPRM defines terms used in this proposal.

[[Page 70855]]

Authority for This Rulemaking

    The FAA's authority to issue rules on aviation safety is found in 
Title 49 of the United States Code. Subtitle I, Section 106 describes 
the authority of the FAA Administrator. Subtitle VII, Aviation 
Programs, describes in more detail the scope of the agency's authority.
    This rulemaking is promulgated under the authority described in 
Subtitle VII, part A, subpart III, section 44701, ``General 
requirements.'' Under that section, the FAA is charged with promoting 
safe flight of civil aircraft in air commerce by prescribing 
regulations and minimum standards for the design and performance of 
aircraft that the Administrator finds necessary for safety in air 
commerce. This regulation is within the scope of that authority. It 
prescribes new safety standards for the design and operation of 
transport category airplanes.

Background

    Part 25 of Title 14 of the Code of Federal Regulations (14 CFR) 
prescribes airworthiness standards for type certification of transport 
category airplanes for products certified in the United States. EASA's 
Certification Specifications for Large Aeroplanes (CS-25) prescribe the 
corresponding airworthiness standards for products certified in Europe 
by the European Aviation Safety Agency. While part 25 and CS-25 are 
similar, they differ in several respects.
    The FAA tasked the Aviation Rulemaking Advisory Committee (ARAC) 
through its Flight Test Harmonization Working Group to review existing 
regulations and recommend changes that would eliminate differences 
between the U.S. and European performance and handling characteristics 
standards by harmonizing to the higher standards. This proposed rule is 
a result of this harmonization effort.

General Discussion of the Proposal

    Three of the four changes to the part 25 airworthiness requirements 
proposed in this rulemaking respond to ARAC recommendations and EASA's 
actions in response to those recommendations. The fourth proposed 
change (pertaining to the stall warning margin for the landing 
configuration in icing conditions) responds to an action taken by EASA 
regarding a comment made during the public comment period of the 
harmonized rulemaking that led to adoption of Amendment 25-121 and 
Amendment 3 of CS-25.
    The FAA agrees with the actions taken by EASA and proposes to amend 
part 25 in a similar manner. The proposals are not expected to be 
controversial and should reduce costs to industry without adversely 
affecting safety. In developing these proposals, ARAC and the FAA 
considered the following factors:
    a. Underlying safety issues addressed by current standards;
    b. Differences between part 25 and CS-25 standards;
    c. Differences between part 25 and CS-25 means of compliance;
    e. Effect of the proposed standard on current industry practice;
    f. Whether FAA advisory material exists and/or needs amendment; and
    g. The costs and benefits of each proposal.

The complete analyses for the proposed changes made in response to ARAC 
recommendations can be found in the ARAC recommendation reports. We 
have placed the reports in the docket for this rulemaking.
    The appendix of this preamble contains a glossary of airspeed terms 
and definitions to help the reader understand the rulemaking proposals.

Proposals From ARAC Recommendations

    The following proposals result from ARAC recommendations made to 
the FAA and EASA:
    (1) Amend Sec.  25.107(e)(1)(iv), selection of the takeoff rotation 
speed;
    (2) Amend Sec.  25.177, static lateral-directional stability; and
    (3) Amend Sec.  25.253, roll capability and extension of 
speedbrakes at high speeds.
    EASA's rulemaking action in response to these recommendations was 
included in the original issuance of CS-25, effective October 17, 2003. 
The adopted CS-25 requirements differ somewhat from the ARAC 
recommendations due to public comments received during the rulemaking 
process and because EASA disagreed with some portions of ARAC's 
recommendations.

A Proposal From a Commenter

    The sole proposal that did not result from an ARAC recommendation 
is to amend Sec.  25.21(g)(1) to add stall warning requirements that 
must be met in the landing configuration for flight in icing 
conditions. This proposal originates from a comment that this 
requirement should be added, which was made during the public comment 
period of the rulemaking that led to adoption of Amendment 25-121, 
Airplane Performance and Handling Qualities in Icing Conditions.
    In the preamble to that rulemaking (72 FR 44665), the FAA stated 
that we needed more time and aviation industry participation to fully 
address the safety concern expressed in this comment. We were concerned 
that adopting the changes proposed by the commenter would introduce 
significant regulatory differences from EASA's airworthiness 
certification requirements, and potentially add significant costs (as 
an initial cost estimate indicated). Further, it was unclear whether 
the proposed changes would completely resolve the potential safety 
issue.
    The commenter made the same comment to EASA during the public 
comment period for the rulemaking that became Amendment 3 to CS-25, 
which corresponds to Amendment 25-121 of 14 CFR. EASA deferred 
addressing the comment until its Notice of Proposed Amendment 2008-05, 
dated April 10, 2008. EASA did not receive any opposing comments from 
the public and adopted the rule change in Amendment 6 to CS-25, issued 
July 6, 2009. The FAA proposes to amend Sec.  25.21(g) in the same 
manner.

Discussion of the Proposed Regulatory Requirements

Proof of Compliance--Sec.  25.21(g)(1)

    Section 25.21(g)(1) specifies which subpart B requirements must be 
met in icing conditions and the ice accretions that must be used to 
show compliance. The current rule does not require the stall warning 
margin requirements of Sec.  25.207(c) and (d) to be met in icing 
conditions. The proposed rule would require that these stall warning 
margin requirements be met in icing conditions for the landing 
configuration. This proposed change would harmonize our standards with 
CS 25.21(g)(1), except for one minor difference regarding seaplanes and 
amphibians. This is because part 25 contains requirements for seaplanes 
and amphibians, and CS-25 does not.

Takeoff Speeds--Sec.  25.107(e)(1)(iv)

    This requirement ensures that the scheduled takeoff speeds provide 
a minimum liftoff speed (VLOF) greater than the minimum safe 
flyaway speed (VMU). The VMU is the lowest speed 
at which an applicant demonstrates that no hazardous characteristics 
are present, such as a relatively high drag condition or a stall. This 
rule prescribes a minimum speed margin between VLOF and 
VMU to ensure a safe takeoff speed, while taking likely in-
service variations in takeoff technique into consideration.
    The FAA proposes to allow reduction of both the all-engines-
operating and one-engine-inoperative speed margins between 
VMU and VLOF for airplanes for

[[Page 70856]]

which the minimum liftoff speed is limited by the geometry of the 
airplane (i.e., ground contact of the tail of the airframe with the 
runway as the nose lifts off). This limiting condition provides 
protection against early or over-rotation beyond the safe liftoff pitch 
attitude at or near VMU such that the prescribed minimum 
speed margin can be reduced without reducing the level of safety. In 
the past, the FAA has allowed reduction of this speed margin for 
geometry-limited airplanes for the all-engines-operating condition 
using findings of equivalent safety. The proposed standard would codify 
this practice and extend its application to the one-engine-inoperative 
condition. This proposed change would harmonize this takeoff speed 
requirement with CS 25.107(e)(1)(iv).

Static Lateral-Directional Stability--Sec.  25.177

    This requirement ensures that transport category airplanes have 
basic lateral and directional stability, proportionality between 
aileron and rudder control movements and forces (at least within the 
sideslip angles appropriate to the operation of the airplane), and 
freedom from fin stall or rudder overbalance. The full rudder sideslip 
requirements of Sec.  25.177(c) are primarily intended to investigate 
the potential for a loss of directional stability or fin stall (as 
indicated by a decrease in the rudder deflection needed for increased 
angles of sideslip) and rudder overbalance or locking (as indicated by 
a reversal in the rudder pedal force).
    The proposed revision to Sec.  25.177(a) and (b) would reinstate 
the standards that existed prior to Amendment 25-72 that treat the 
specific lateral and directional stability requirements as separate 
entities.
    The proposed revisions to Sec.  25.177(c) are as follows:
    1. Divide the existing paragraph into two separate paragraphs. The 
proposed Sec.  25.177(c) would address the basic lateral and 
directional stability, while a new paragraph (d) would be introduced to 
address full rudder sideslips. The existing paragraph (d) would be 
removed as its provisions would be covered by the reinstated Sec.  
25.177(b).
    2. Revise Sec.  25.177(c) to require that proportionality criteria 
must also be met at the sideslip angles obtained with one-half of the 
available rudder control (i.e., rudder pedal input). This change would 
impose a minimum lateral control power requirement such that the 
airplane must be capable of maintaining a straight, steady, sideslip 
when the pilot puts in one-half of the available rudder control or uses 
a force of 180 pounds on the rudder control at the conditions specified 
in the rule.
    3. Specify that the requirements in Sec.  25.177(c) must be met for 
the configurations and speeds specified in Sec.  25.177(a). This 
proposal would not change the applicable conditions from those applied 
in practice under the current Sec.  25.177(c).
    4. Move the current Sec.  25.177(c) requirement that applies to 
sideslip angles greater than those considered appropriate for normal 
operation of the airplane (i.e., up to full rudder control input) to a 
proposed new Sec.  25.177(d). The conditions for which this requirement 
must be met would include all of the approved landing gear and flap 
positions for the range of operating speeds and power conditions 
appropriate to each landing gear and flap position with all engines 
operating. Relative to the current Sec.  25.177(c), this proposal would 
reduce the range of speeds and power settings for which the requirement 
applies. The reduced speed ranges specified in the proposed Sec.  
25.177(d) are intended to reduce the flight test safety risk as well as 
to harmonize and standardize current practices.
    5. Add text to the new Sec.  25.177(d) stating that compliance with 
this requirement must be shown using straight, steady sideslips, unless 
full lateral control input is achieved before reaching either the 
rudder control input or force limit. A straight, steady sideslip need 
not be maintained beyond the lateral control limit. This change further 
clarifies the intent of the requirement regarding the capability 
required beyond the sideslip angles considered appropriate for 
operations. For airplanes lacking sufficient aileron control power to 
maintain a steady heading with full rudder input, any flight test 
demonstration would be continued to full rudder input even though a 
steady heading could not be maintained. This situation has caused 
difficulties in the past because the current rule wording is ambiguous 
regarding the conduct of the full rudder sideslips. This proposal would 
codify the FAA interpretation provided in the preamble to Amendment 25-
72, Special Review: Transport Category Airplane Airworthiness Standards 
(55 FR 29756).
    Also, Sec.  25.253(b) and (c) would be revised to reference only 
Sec.  25.177 (a) through (c), rather than the entire Sec.  25.177, to 
be consistent with the proposed reduced speed range over which Sec.  
25.177(d) applies. The current Sec.  25.253 (b) and (c) specify that 
VFC/MFC is the maximum speed for which the 
requirements of all of Sec.  25.177 must be met. Because the proposed 
Sec.  25.177(d) requirements only apply to the operational speed range 
(e.g., VMO/MMO) and need not be met at 
VFC/MFC, the reference to Sec.  25.177 in Sec.  
25.253(b) and (c) would be revised to refer only to Sec.  25.177(a) 
through (c).
    These proposed changes would harmonize the static lateral-
directional stability requirements with the corresponding CS-25 
requirements and update references to these requirements in other 
sections of part 25.

High-Speed Characteristics--Sec.  25.253

    This requirement assures that the airplane has safe recovery 
characteristics at speeds beyond the maximum operating limit speed 
(VMO/MMO) up to the maximum demonstrated flight 
diving speed (VDF/MDF). We propose to add 
requirements that (1) there must be adequate roll capability to assure 
a prompt recovery from a lateral upset condition and (2) speedbrake 
extension at high speed must not result in an excessive positive load 
factor when the pilot does act to counteract the effects of the 
extension. The speedbrake extension at high speed also must not cause 
buffeting that would impair the pilot's ability to read the instruments 
or cause a nose-down pitching moment, unless that pitching moment is 
small.
    The proposed revision would harmonize our high-speed 
characteristics requirements with CS 25.253.

Advisory Material

    The FAA is revising AC 25-7 to incorporate guidance on how to 
comply with the proposed harmonized standards. The draft AC is posted 
on the FAA's draft document Web site at https://www.faa.gov/aircraft/draft_docs/.

Paperwork Reduction Act

    The Paperwork Reduction Act of 1995 (44 U.S.C. 3507(d)) requires 
that the FAA consider the impact of paperwork and other information 
collection burdens imposed on the public. The FAA has determined that 
there would be no new requirement for information collection associated 
with this proposed rule.

International Compatibility

    In keeping with U.S. obligations under the Convention on 
International Civil Aviation, it is FAA policy to conform to 
International Civil Aviation Organization (ICAO) Standards and 
Recommended Practices to the maximum extent practicable. The FAA has 
reviewed the corresponding ICAO Standards and Recommended Practices

[[Page 70857]]

and has identified no differences with these proposed regulations.

Regulatory Evaluation, Regulatory Flexibility Determination, 
International Trade Impact Assessment, and Unfunded Mandates Assessment

    Changes to Federal regulations must undergo several economic 
analyses. First, Executive Order 12866 directs that each Federal agency 
shall propose or adopt a regulation only upon a reasoned determination 
that the benefits of the intended regulation justify its costs. Second, 
the Regulatory Flexibility Act of 1980 (Pub. L. 96-354) requires 
agencies to analyze the economic impact of regulatory changes on small 
entities. Third, the Trade Agreements Act (Pub. L. 96-39) prohibits 
agencies from setting standards that create unnecessary obstacles to 
the foreign commerce of the United States. In developing U.S. 
standards, this Trade Act requires agencies to consider international 
standards and, where appropriate, that they be the basis of U.S. 
standards. Fourth, the Unfunded Mandates Reform Act of 1995 (Pub. L. 
104-4) requires agencies to prepare a written assessment of the costs, 
benefits, and other effects of proposed or final rules that include a 
Federal mandate likely to result in the expenditure by State, local, or 
tribal governments, in the aggregate, or by the private sector, of $100 
million or more annually (adjusted for inflation with base year of 
1995). This portion of the preamble summarizes the FAA's analysis of 
the economic impact of the proposed rule.
    Department of Transportation Order DOT 2100.5 prescribes policies 
and procedures for simplification, analysis, and review of regulations. 
If the expected cost impact is so minimal that a proposed or final rule 
does not warrant a full evaluation, this order permits that a statement 
to that effect and the basis for it be included in the preamble if a 
full regulatory evaluation of the costs and benefits is not prepared. 
Such a determination has been made for this proposed rule.
    The reasoning for this determination follows: The proposed rule 
would amend Sec. Sec.  25.21(g)(1), 25.107(e)(1)(iv), 25.177, and 
25.253 to harmonize with EASA requirements already in CS-25. A review 
of current practice of U.S. manufacturers of transport category 
airplanes has revealed the manufacturers intend to fully comply with 
the EASA standards (or are already complying) as a means of obtaining 
joint certification. Since future certificated transport category 
airplanes are expected to meet the existing CS-25 requirements and this 
proposed rule would simply adopt the same requirements, the 
manufacturers would incur no additional costs. The proposed rule would 
provide benefits from reduced joint certification costs from the 
harmonization itself, and for the parts of the rule harmonizing with 
less stringent EASA requirements; manufacturers can expect additional 
benefits inherent in the reduced stringency. The FAA therefore has 
determined that this proposed rule would have no costs and positive 
benefits and does not warrant a full regulatory evaluation. The FAA 
requests comments regarding this determination. We discuss the basis 
for our findings below.
    The FAA has also determined that this proposed rule is not a 
``significant regulatory action'' as defined in section 3(f) of 
Executive Order 12866, and is not ``significant'' as defined in DOT's 
Regulatory Policies and Procedures.

Costs and Benefits of This Rulemaking

Cost and Benefits of Proposed Amendment to Sec.  25.21(g)(1)

    We are proposing to adopt an EASA requirement that has no 
counterpart in the current CFR. Manufacturer compliance with the EASA 
requirement would increase the safety of their airplanes. Since the 
manufacturers intend to comply with the EASA requirement, however, 
there would be no additional safety benefits from compliance with the 
proposed harmonizing amendment. Nevertheless, it is beneficial to make 
the FAA's compliance requirement identical to EASA's requirement in 
order to avoid confusion and make clear that the safety implications of 
the proposed Sec.  25.21(g)(1) and CS 25.21(g)(1) are identical.
    As we are proposing to adopt an EASA requirement that has no 
counterpart in the current CFR, there can be no reduction in 
certification costs--in the requirements for data collection and 
analysis, paperwork, and time spent applying for and obtaining approval 
from the regulatory authorities. Rather, manufacturers would face some 
increase in certification costs to comply with the EASA requirement. 
Since the manufacturers intend to comply with the EASA requirement, 
however, they would incur no additional costs to comply with the 
proposed FAA harmonizing amendment.

Costs and Benefits of Proposed Amendment to Sec.  25.107(e)(1)(iv)

    Manufacturers would benefit as a result of reduced certification 
costs from the harmonization of proposed Sec.  25.107(e)(1)(iv) with CS 
25.107(e)(1)(iv).
    Additional benefits would result because the proposed amendment is 
a less stringent requirement, which would reduce the required minimum 
takeoff speed of geometry-limited (viz., tail contact with the runway) 
airplanes. As discussed in the preamble above, since the minimum 
takeoff speed is, in part, intended to reduce the probability of an 
airplane reaching a takeoff pitch attitude beyond that shown to be 
safe, the additional protection against such a condition inherent in a 
geometry-limited airplane allows the minimum takeoff speed to be safely 
reduced. The less stringent requirement implies higher takeoff weights, 
increases in payload, and shorter takeoff distances for geometry-
limited airplanes. These are operator benefits, some of which will 
accrue to part 25 manufacturers by increasing airplane value.
    As this proposed amendment is relieving, there would be no increase 
in costs.

Costs and Benefits of Proposed Amendment to Sec.  25.177

    Section 25.177(a) and (b) (requiring separate directional and 
lateral stability assessments) were removed by Amendment 25-72, 
published in the Federal Register (55 FR 29756), July 20, 1990. The FAA 
considered them unnecessary since directional and lateral stability 
could be determined using an ``alternative test'' based on data 
obtained in showing compliance with Sec.  25.177(c). EASA's retention 
of CS 25.177(a) and (b), however, allows manufacturers to use the 
``basic test'' outlined by CS 25.177(a) and (b). Reinstatement of Sec.  
25.177(a) and (b) would lower certification costs for manufacturers 
preferring instead to use the ``basic test.'' Part 25 manufacturers 
preferring to satisfy the stability requirements with the ``alternative 
test'' of Sec.  25.177(c) would face no increase in cost since they 
could still use that test. In any case, since manufacturers intend to 
comply with CS 25.177(a) and (b), they would incur no additional costs 
from complying with the proposed harmonizing amendment regardless of 
the cost situation.
    Compared to the current Sec.  25.177(c) and (d), CS 25.177(c) and 
(d) have both more stringent and less stringent requirements. As 
discussed in the preamble above, the less stringent requirement would 
increase the safety of flight tests without reducing test validity. 
Compliance with the more stringent requirement would entail some 
certification costs and reduce payload-carrying capability under

[[Page 70858]]

certain conditions. Since the manufacturers intend to comply with CS 
25.177(c) and (d), however, they would incur no additional costs to 
comply with the proposed harmonizing amendment.

Costs and Benefits of Proposed Amendment to Sec.  25.253

    Manufacturers would benefit as a result of reduced certification 
costs from the harmonization of Sec.  25.253 with CS 25.253. The 
compliance of the manufacturers with the more stringent EASA 
requirements would also increase the safety of their airplanes. Since 
the manufacturers intend to comply with the EASA requirements, however, 
there would be no additional safety benefits from compliance with the 
proposed FAA harmonizing amendment.
    Part 25 manufacturers would face additional certification costs, 
especially additional flight testing costs, to meet the EASA 
requirements. Since the manufacturers intend to comply with the EASA 
requirements, however, they would incur no additional costs to comply 
with the proposed FAA harmonizing amendment.

Summary of Costs and Benefits

    The benefits of an FAA rule harmonizing with a more stringent EASA 
rule necessarily flow from reduced certification costs brought about by 
the harmonization itself. Just as any costs are attributable to 
complying with the existing EASA rule, so too are any benefits from 
increased safety. Accordingly, the benefits of the more stringent 
Sec. Sec.  25.21(g)(1), 25.253, 25.177(a) and (b), and the more 
stringent parts of Sec.  25.177(c) and (d) would be reduced 
certification costs or qualitative benefits from harmonization.
    For an FAA rule harmonizing with a less stringent EASA rule, there 
would be reduced certification costs from the harmonization itself, but 
also benefits inherent in the reduced stringency. For Sec.  
25.107(e)(1)(iv) the inherent benefits to operators would be higher 
takeoff weights, increases in payload, and shorter takeoff distances 
for geometry-limited airplanes allowed by the reduced minimum takeoff 
speeds. For the reduced speed ranges specified in proposed Sec.  
25.177(c) and (d), the inherent benefits would be to reduce test flight 
safety risk.
    The FAA, therefore, has determined that this proposed rule would 
have minimal costs with positive net benefits and does not warrant a 
full regulatory evaluation. The FAA requests comments regarding our 
determination of minimal costs with positive net benefits.

Regulatory Flexibility Determination

    The Regulatory Flexibility Act of 1980 (Pub. L. 96-354) (RFA) 
establishes ``as a principle of regulatory issuance that agencies shall 
endeavor, consistent with the objectives of the rule and of applicable 
statutes, to fit regulatory and informational requirements to the scale 
of the businesses, organizations, and governmental jurisdictions 
subject to regulation. To achieve this principle, agencies are required 
to solicit and consider flexible regulatory proposals and to explain 
the rationale for their actions to assure that such proposals are given 
serious consideration.'' The RFA covers a wide-range of small entities, 
including small businesses, not-for-profit organizations, and small 
governmental jurisdictions.
    Agencies must perform a review to determine whether a rule will 
have a significant economic impact on a substantial number of small 
entities. If the agency determines that it will, the agency must 
prepare a regulatory flexibility analysis as described in the RFA. 
However, if an agency determines that a rule is not expected to have a 
significant economic impact on a substantial number of small entities, 
section 605(b) of the RFA provides that the head of the agency may so 
certify and a regulatory flexibility analysis is not required. The 
certification must include a statement providing the factual basis for 
this determination, and the reasoning should be clear.
    As noted above, this proposed rule would not entail any additional 
costs to part 25 manufacturers as they are already in compliance, or 
intend to fully comply, with more stringent EASA standards. Moreover, 
all U.S. manufacturers of transport category airplanes exceed the Small 
Business Administration small-entity criteria of 1,500 employees. 
Therefore, the FAA certifies that this proposed rule would not have a 
significant economic impact on a substantial number of small entities. 
The FAA requests comments regarding this determination.

International Trade Impact Assessment

    The Trade Agreements Act of 1979 (Pub. L. 96-39), as amended by the 
Uruguay Round Agreements Act (Pub. L. 103-465), prohibits Federal 
agencies from establishing standards or engaging in related activities 
that create unnecessary obstacles to the foreign commerce of the United 
States. Pursuant to these Acts, the establishment of standards is not 
considered an unnecessary obstacle to the foreign commerce of the 
United States, so long as the standard has a legitimate domestic 
objective, such the protection of safety, and does not operate in a 
manner that excludes imports that meet this objective. The statute also 
requires consideration of international standards and, where 
appropriate, that they be the basis for U.S. standards. The FAA has 
assessed the potential effect of this proposed rule and determined that 
it would promote international trade by harmonizing with corresponding 
EASA regulations thus reducing the cost of joint certification.

Unfunded Mandates Assessment

    Title II of the Unfunded Mandates Reform Act of 1995 (Pub. L. 104-
4) requires each Federal agency to prepare a written statement 
assessing the effects of any Federal mandate in a proposed or final 
agency rule that may result in an expenditure of $100 million or more 
(in 1995 dollars) in any one year by State, local, and tribal 
governments, in the aggregate, or by the private sector; such a mandate 
is deemed to be a ``significant regulatory action.'' The FAA currently 
uses an inflation-adjusted value of $136.1 million in lieu of $100 
million.
    This proposed rule does not contain such a mandate. The 
requirements of Title II do not apply.

Executive Order 13132, Federalism

    The FAA has analyzed this proposed rule and the principles and 
criteria of Executive Order 13132, Federalism. We determined that this 
action would not have a substantial direct effect on the States, on the 
relationship between the national government and the States, or on the 
distribution of power and responsibilities among the various levels of 
government and therefore, would not have federalism implications.

Environmental Analysis

    FAA Order 1050.1E identifies FAA actions that are categorically 
excluded from preparation of an environmental assessment or 
environmental impact statement under the National Environmental Policy 
Act in the absence of extraordinary circumstances. The FAA has 
determined this proposed rulemaking action qualifies for the 
categorical exclusion identified in paragraph 312d and involves no 
extraordinary circumstances.

Regulations That Significantly Affect Energy Supply, Distribution, or 
Use

    The FAA has analyzed this NPRM under Executive Order 13211, Actions 
Concerning Regulations that Significantly Affect Energy Supply, 
Distribution, or Use (May 18, 2001). We have determined that it is not 
a ``significant energy action'' under the

[[Page 70859]]

executive order, it is not a ``significant regulatory action'' under 
Executive Order 12866 and DOT's Regulatory Policies and Procedures, and 
it is not likely to have a significant adverse effect on the supply, 
distribution, or use of energy.

Regulations Affecting Intrastate Aviation in Alaska

    Section 1205 of the FAA Reauthorization Act of 1996 (110 Stat. 
3213) requires the Administrator, when modifying regulations in Title 
14 of the CFR in a manner affecting intrastate aviation in Alaska, to 
consider the extent to which Alaska is not served by transportation 
modes other than aviation, and to establish such regulatory 
distinctions as he or she considers appropriate. Because this proposed 
rule would apply to the certification of future designs of transport 
category airplanes and their subsequent operation, it could, if 
adopted, affect intrastate aviation in Alaska. The FAA therefore 
specifically requests comments on whether there is justification for 
applying the proposed rule differently to intrastate operations in 
Alaska.

Plain English

    Executive Order 12866 (58 FR 51735, Oct. 4, 1993) requires each 
agency to write regulations that are simple and easy to understand. We 
invite your comments on how to make these proposed regulations easier 
to understand, including answers to questions such as the following:
     Are the requirements in the proposed regulations clearly 
stated?
     Do the proposed regulations contain unnecessary technical 
language or jargon that interferes with their clarity?
     Would the regulations be easier to understand if they were 
divided into more (but shorter) sections?
     Is the description in the preamble helpful in 
understanding the proposed regulations?
    Please send your comments to the address specified in the ADDRESSES 
section.

Additional Information

Comments Invited

    The FAA invites interested persons to participate in this 
rulemaking by submitting written comments, data, or views. We also 
invite comments relating to the economic, environmental, energy, or 
federalism impacts that might result from adopting the proposals in 
this document. The most helpful comments reference a specific portion 
of the proposal, explain the reason for any recommended change, and 
include supporting data. To ensure that the docket does not contain 
duplicate comments, please send only one copy of written comments, or 
if you are filing comments electronically, please submit your comments 
only one time.
    We will file in the docket all comments we receive, as well as a 
report summarizing each substantive public contact with FAA personnel 
concerning this proposed rulemaking. Before acting on this proposal, we 
will consider all comments we receive on or before the closing date for 
comments. We will consider comments filed after the comment period has 
closed if it is possible to do so without incurring expense or delay. 
We may change this proposal because of the comments we receive.

Proprietary or Confidential Business Information

    Do not file in the docket information that you consider to be 
proprietary or confidential business information. Send or deliver such 
information directly to the person identified in the FOR FURTHER 
INFORMATION CONTACT section of this document. You must mark the 
information that you consider proprietary or confidential. If you send 
the information on a disk or CD-ROM, mark the outside of the disk or 
CD-ROM and also identify electronically within the disk or CD-ROM the 
specific information that is proprietary or confidential.
    Under Sec.  11.35(b), when we are aware of proprietary information 
filed with a comment, we do not place it in the docket. We hold it in a 
separate file to which the public does not have access, and we place a 
note in the docket that we have received it. If we receive a request to 
examine or copy this information, we treat it as any other request 
under the Freedom of Information Act (5 U.S.C. 552). We process such a 
request under the DOT procedures found in 49 CFR part 7.

Availability of Rulemaking Documents

    You can get an electronic copy of rulemaking documents using the 
Internet by--
    1. Searching the Federal eRulemaking Portal (https://www.regulations.gov);
    2. Visiting the FAA's Regulations and Policies Web page at https://www.faa.gov/regulations_policies/; or
    3. Accessing the Government Printing Office's web page at https://www.gpoaccess.gov/fr/.
    You can also get a copy by sending a request to the Federal 
Aviation Administration, Office of Rulemaking, ARM-1, 800 Independence 
Avenue, SW., Washington, DC 20591, or by calling (202) 267-9680. Make 
sure to identify the docket number or notice number of this rulemaking.
    You may access all documents the FAA considered in developing this 
proposed rule, including economic analyses and technical reports, from 
the Internet through the Federal eRulemaking Portal referenced in 
paragraph (1).

Appendix 1 to the Preamble

                       Speed Terms and Definitions
------------------------------------------------------------------------
               Term                              Definition
------------------------------------------------------------------------
VR...............................  Rotation speed.
V1...............................  Maximum speed in the takeoff at which
                                    the pilot must take the first action
                                    (e.g., apply brakes, reduce thrust,
                                    deploy speed brakes) to stop the
                                    airplane within the accelerate stop
                                    distance. It also means the minimum
                                    speed in the takeoff, following a
                                    failure of the critical engine at
                                    VEF, at which the pilot can continue
                                    the takeoff and achieve the required
                                    height above the takeoff surface
                                    within the takeoff distance.
V2...............................  Takeoff safety speed.
VREF.............................  Reference landing speed.
VSW..............................  Speed at which the onset of natural
                                    or artificial stall warning occurs.
VSR..............................  Reference stall speed.
VSR1.............................  Reference stall speed in a specific
                                    configuration.
VLOF.............................  Lift-off speed.
VMU..............................  Minimum unstick speed.
VMC..............................  Minimum control speed with the
                                    critical engine inoperative.
VFE..............................  Maximum flap extended speed.
VLE..............................  Maximum landing gear extended speed.

[[Page 70860]]

 
VFC/MFC..........................  Maximum speed for stability
                                    characteristics.
VMO/MMO..........................  Maximum operating limit speed.
VDF/MDF..........................  Demonstrated flight diving speed.
------------------------------------------------------------------------

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements, Safety.

The Proposed Amendment

    In consideration of the foregoing, the Federal Aviation 
Administration proposes to amend part 25 of Title 14, Code of Federal 
Regulations, as follows:

PART 25--AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES

    1. The authority citation for part 25 continues to read as follows:

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

    2. Amend Sec.  25.21 by revising paragraph (g)(1) to read as 
follows:


Sec.  25.21  Proof of compliance.

* * * * *
    (g) * * *
    (1) Each requirement of this subpart, except Sec. Sec.  25.121(a), 
25.123(c), 25.143(b)(1) and (b)(2), 25.149, 25.201(c)(2), 25.239, and 
25.251(b) through (e), must be met in icing conditions. Section 
25.207(c) and (d) must be met in the landing configuration in icing 
conditions, but need not be met for other configurations. Compliance 
must be shown using the ice accretions defined in appendix C of this 
part, assuming normal operation of the airplane and its ice protection 
system in accordance with the operating limitations and operating 
procedures established by the applicant and provided in the Airplane 
Flight Manual.
* * * * *
    3. Amend Sec.  25.107 by revising paragraph (e)(1)(iv) to read as 
follows:


Sec.  25.107  Takeoff speeds.

* * * * *
    (e) * * *
    (1) * * *
    (iv) A speed that, if the airplane is rotated at its maximum 
practicable rate, will result in a VLOF of not less than--
    (A) 110 percent of VMU in the all-engines-operating 
condition, and 105 percent of VMU determined at the thrust-
to-weight ratio corresponding to the one-engine-inoperative condition; 
or
    (B) If the VMU attitude is limited by the geometry of 
the airplane (i.e., tail contact with the runway), 108 percent of 
VMU in the all-engines-operating condition and 104 percent 
of VMU determined at the thrust-to-weight ratio 
corresponding to the one-engine-inoperative condition.
* * * * *
    4. Revise Sec.  25.177 to read as follows:


Sec.  25.177  Static lateral-directional stability.

    (a) The static directional stability (as shown by the tendency to 
recover from a skid with the rudder free) must be positive for any 
landing gear and flap position and symmetric power condition, at speeds 
from 1.13 VSR1, up to VFE, VLE, or 
VFC/MFC (as appropriate).
    (b) The static lateral stability (as shown by the tendency to raise 
the low wing in a sideslip with the aileron controls free) for any 
landing gear and flap position and symmetric power condition, may not 
be negative at any airspeed (except that speeds higher than 
VFE need not be considered for flaps extended configurations 
nor speeds higher than VLE for landing gear extended 
configurations) in the following airspeed ranges:
    (1) From 1.13 VSR1 to VMO/MMO.
    (2) From VMO/MMO to VFC/
MFC, unless the divergence is--
    (i) Gradual;
    (ii) Easily recognizable by the pilot; and
    (iii) Easily controllable by the pilot.
    (c) In straight, steady sideslips over the range of sideslip angles 
appropriate to the operation of the airplane, but not less than those 
obtained with one-half of the available rudder control input or a 
rudder control force of 180 pounds, the aileron and rudder control 
movements and forces must be substantially proportional to the angle of 
sideslip in a stable sense; and the factor of proportionality must lie 
between limits found necessary for safe operation. This requirement 
must be met for the configurations and speeds specified in paragraph 
(a) of this section.
    (d) For sideslip angles greater than those prescribed by paragraph 
(c) of this section, up to the angle at which full rudder control is 
used or a rudder control force of 180 pounds is obtained, the rudder 
control forces may not reverse, and increased rudder deflection must be 
needed for increased angles of sideslip. Compliance with this 
requirement must be shown using straight, steady sideslips, unless full 
lateral control input is achieved before reaching either full rudder 
control input or a rudder control force of 180 pounds; a straight, 
steady sideslip need not be maintained after achieving full lateral 
control input. This requirement must be met at all approved landing 
gear and flap positions for the range of operating speeds and power 
conditions appropriate to each landing gear and flap position with all 
engines operating.
    5. Amend Sec.  25.253 by adding paragraphs (a)(4) and (a)(5) and 
revising paragraphs (b) and (c) introductory text to read as follows:


Sec.  25.253  High-speed characteristics.

    (a) * * *
    (4) Adequate roll capability to assure a prompt recovery from a 
lateral upset condition must be available at any speed up to 
VDF/MDF.
    (5) With the airplane trimmed at VMO/MMO, 
extension of the speedbrakes over the available range of movements of 
the pilot's control, at all speeds above VMO/MMO, 
but not so high that VDF/MDF would be exceeded 
during the maneuver, must not result in:
    (i) An excessive positive load factor when the pilot does not take 
action to counteract the effects of extension;
    (ii) Buffeting that would impair the pilot's ability to read the 
instruments or control the airplane for recovery; or
    (iii) A nose down pitching moment, unless it is small.
    (b) Maximum speed for stability characteristics, VFC/MFC. 
VFC/MFC is the maximum speed at which the 
requirements of Sec. Sec.  25.143(g), 25.147(e), 25.175(b)(1), 
25.177(a) through (c), and 25.181 must be met with flaps and landing 
gear retracted. Except as noted in Sec.  25.253(c), VFC/
MFC may not be less than a speed midway between 
VMO/MMO and VDF/MDF, except 
that, for altitudes where Mach number is the limiting factor, 
MFC need not exceed the Mach number at which effective speed 
warning occurs.
    (c) Maximum speed for stability characteristics in icing 
conditions. The maximum speed for stability characteristics with the 
ice accretions defined in appendix C, at which the requirements of 
Sec. Sec.  25.143(g), 25.147(e),

[[Page 70861]]

25.175(b)(1), 25.177(a) through (c), and 25.181 must be met, is the 
lower of:
* * * * *

    Issued in Washington, DC, on November 9, 2010.
KC Yanamura,
Deputy Director, Aircraft Certification Service.
[FR Doc. 2010-29193 Filed 11-18-10; 8:45 am]
BILLING CODE 4910-13-P