Special Conditions: Gulfstream Aerospace Limited Partnership (GALP) Model G150 Airplane; Windshield Coating in Lieu of Wipers, 37715-37717 [05-12883]
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Federal Register / Vol. 70, No. 125 / Thursday, June 30, 2005 / Proposed Rules
For the reasons set out in the
preamble and under the authority of the
Atomic Energy Act of 1954, as amended;
the Energy Reorganization Act of 1974,
as amended; and 5 U.S.C. 553; the NRC
is proposing to adopt the following
amendments to 10 CFR Part 72.
SAR Submitted by: BNG Fuel Solutions
Corporation.
SAR Title: Final Safety Analysis Report for
the Ventilated Storage Cask System.
Docket Number: 72–1007.
Certificate Expiration Date: May 7, 2013.
Model Number: VSC–24
PART 72—LICENSING
REQUIREMENTS FOR THE
INDEPENDENT STORAGE OF SPENT
NUCLEAR FUEL, HIGH-LEVEL
RADIOACTIVE WASTE, AND
REACTOR-RELATED GREATER THAN
CLASS C WASTE
Dated at Rockville, Maryland, this 14th day
of June, 2005.
For the Nuclear Regulatory Commission.
*
*
*
*
*
Luis A. Reyes,
Executive Director for Operations.
[FR Doc. 05–12888 Filed 6–29–05; 8:45 am]
BILLING CODE 7590–01–P
1. The authority citation for Part 72
continues to read as follows:
Authority: Secs. 51, 53, 57, 62, 63, 65, 69,
81, 161, 182, 183, 184, 186, 187, 189, 68 Stat.
929, 930, 932, 933, 934, 935, 948, 953, 954,
955, as amended, sec. 234, 83 Stat. 444, as
amended (42 U.S.C. 2071, 2073, 2077, 2092,
2093, 2095, 2099, 2111, 2201, 2232, 2233,
2234, 2236, 2237, 2238, 2282); sec. 274, Pub.
L. 86–373, 73 Stat. 688, as amended (42
U.S.C. 2021); sec. 201, as amended, 202, 206,
88 Stat. 1242, as amended, 1244, 1246 (42
U.S.C. 5841, 5842, 5846); Pub. L. 95–601, sec.
10, 92 Stat. 2951 as amended by Pub. L. 102–
486, sec. 7902, 106 Stat. 3123 (42 U.S.C.
5851); sec. 102, Pub. L. 91–190, 83 Stat. 853
(42 U.S.C. 4332); secs. 131, 132, 133, 135,
137, 141, Pub. L. 97–425, 96 Stat. 2229, 2230,
2232, 2241, sec. 148, Pub. L. 100–203, 101
Stat. 1330–235 (42 U.S.C. 10151, 10152,
10153, 10155, 10157, 10161, 10168); sec.
1704, 112 Stat. 2750 (44 U.S.C. 3504 note).
Section 72.44(g) also issued under secs.
142(b) and 148(c), (d), Pub. L. 100–203, 101
Stat. 1330–232, 1330–236 (42 U.S.C.
10162(b), 10168(c), (d)). Section 72.46 also
issued under sec. 189, 68 Stat. 955 (42 U.S.C.
2239); sec. 134, Pub. L. 97–425, 96 Stat. 2230
(42 U.S.C. 10154). Section 72.96(d) also
issued under sec. 145(g), Pub. L. 100–203,
101 Stat. 1330–235 (42 U.S.C. 10165(g)).
Subpart J also issued under secs. 2(2), 2(15),
2(19), 117(a), 141(h), Pub. L. 97–425, 96 Stat.
2202, 2203, 2204, 2222, 2244 (42 U.S.C.
10101, 10137(a), 10161(h)). Subparts K and L
are also issued under sec. 133, 98 Stat. 2230
(42 U.S.C. 10153) and sec. 218(a), 96 Stat.
2252 (42 U.S.C. 10198).
2. In § 72.214, Certificate of
Compliance 1007 is revised to read as
follows:
§ 72.214 List of approved spent fuel
storage casks.
*
*
*
*
*
Certificate Number: 1007.
Initial Certificate Effective Date: May 7,
1993.
Amendment Number 1 Effective Date: May
30, 2000.
Amendment Number 2 Effective Date:
September 5, 2000.
Amendment Number 3 Effective Date: May
21, 2001.
Amendment Number 4 Effective Date:
February 3, 2003.
Amendment Number 5 Effective Date:
September 13, 2005.
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Jkt 205001
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM310; Notice No. 25–05–07–
SC]
Special Conditions: Gulfstream
Aerospace Limited Partnership (GALP)
Model G150 Airplane; Windshield
Coating in Lieu of Wipers
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed special
conditions.
AGENCY:
SUMMARY: This notice proposes special
conditions for the Gulfstream Aerospace
Limited Partnership (GALP) Model
G150 airplane. This airplane will have
a novel or unusual design feature
associated with use of a hydrophobic
coating, rather than windshield wipers,
as the means to maintain a clear portion
of the windshield during precipitation
conditions, as required by the
airworthiness standards for transport
category airplanes. The applicable
airworthiness regulations do not contain
adequate or appropriate safety standards
for this design feature. These proposed
special conditions contain the
additional safety standards that the
Administrator considers necessary to
establish a level of safety equivalent to
that established by the existing
airworthiness standards.
DATES: Comments must be received on
or before August 15, 2005.
ADDRESSES: Comments on this proposal
may be mailed in duplicate to: Federal
Aviation Administration, Transport
Airplane Directorate, Attn: Rules Docket
(ANM–113), Docket No. NM310, 1601
Lind Avenue SW., Renton, Washington
98055–4056; or delivered in duplicate to
the Transport Airplane Directorate at
the above address. Comments must be
marked: Docket No. NM310. Comments
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37715
may be inspected in the Rules Docket
weekdays, except Federal holidays,
between 7:30 a.m. and 4 p.m.
FOR FURTHER INFORMATION CONTACT: John
McConnell, Airplane and Flight Crew
Interface Branch, ANM–111, Transport
Airplane Directorate, Aircraft
Certification Service, 1601 Lind Avenue
SW., Renton, Washington 98055–4056;
telephone (425) 227–1365; facsimile
(425) 227–1320, e-mail
john.mcconnell@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites interested persons to
participate in this rulemaking by
submitting written comments, data, or
views. The most helpful comments
reference a specific portion of the
special conditions, explain the reason
for any recommended change, and
include supporting data. We ask that
you send us two copies of written
comments.
We will file in the docket all
comments we receive, as well as a
report summarizing each substantive
public contact with FAA personnel
concerning these special conditions.
The docket is available for public
inspection before and after the comment
closing date. If you wish to review the
docket in person, go to the address in
the ADDRESSES section of this preamble
between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
We will consider all comments we
receive on or before the closing date for
comments. We will consider comments
filed late if it is possible to do so
without incurring expense or delay. We
may change these special conditions in
light of the comments we receive.
If you want the FAA to acknowledge
receipt of your comments on this
proposal, include with your comments
a pre-addressed, stamped postcard on
which the docket number appears. We
will stamp the date on the postcard and
mail it back to you.
Background
On September 22, 2002, GALP
applied for an amendment to Type
Certificate Number A16NM to include
the new GALP Model G150 airplane.
The GALP Model G150, which is a
derivative of the GALP Model G100
currently approved under Type
Certificate Number A16NM, is intended
to be a nine passenger executive
airplane with a maximum takeoff weight
of 26,000 pounds and a maximum
operating altitude of 45,000 feet.
The GALP Model G150 flightdeck
design incorporates a hydrophobic
coating to provide adequate pilot
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Federal Register / Vol. 70, No. 125 / Thursday, June 30, 2005 / Proposed Rules
compartment view in the presence of
precipitation. Sole reliance on such a
coating, without windshield wipers,
constitutes a novel or unusual design
feature for which the applicable
airworthiness regulations do not contain
adequate or appropriate safety
standards. Therefore, special conditions
are required that provides the level of
safety equivalent to that established by
the regulations.
Type Certification Basis
Under the provisions of 14 CFR
21.101, GALP must show that the Model
G150 meets the applicable provisions of
the regulations incorporated by
reference in Type Certificate Number
A16NM or the applicable regulations in
effect on the date of application for the
change to the type certificate. The
regulations incorporated by reference in
the type certificate are commonly
referred to as the ‘‘original type
certification basis.’’ The regulations
incorporated by reference in Type
Certificate Number A16NM are 14 CFR
part 25, effective February 1, 1965,
including Amendments 25–1 through
25–107.
In addition, if the regulations
incorporated by reference do not
provide adequate standards with respect
to the change, the applicant must
comply with certain regulations in effect
on the date of application for the
change. GALP has elected to voluntarily
comply with Amendment 25–108 for
the G150 type certification program.
If the Administrator finds that the
applicable airworthiness regulations
(i.e., 14 CFR part 25) do not contain
adequate or appropriate safety standards
for the Model G150 because of a novel
or unusual design feature, special
conditions are prescribed under the
provisions of § 21.16.
In addition to the applicable
airworthiness regulations and special
conditions, the Model G150 must
comply with (1) either the ‘‘No
Acoustical Change’’ provisions of
§ 21.93(b) or 14 CFR part 36, as
amended by Amendments 36–1 thru
36–24, and (2) either the ‘‘No Emission
Change’’ provisions of § 21.93(c) or 14
CFR part 34, as amended by
Amendments 34–1 through 34–3.
Special conditions, as defined in 14
CFR 11.19, are issued in accordance
with § 11.38 and become part of the type
certification basis in accordance with
§ 21.101.
Special conditions are initially
applicable to the model for which they
are issued. Should the type certificate
for that model be amended later to
include any other model that
incorporates the same or similar novel
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15:17 Jun 29, 2005
Jkt 205001
or unusual design feature, or should any
other model already included on the
same type certificate be modified to
incorporate the same novel or unusual
design feature, the special conditions
would also apply to the other model
under the provisions of § 21.101.
Novel or Unusual Design Features
The GALP Mode G150 will
incorporate the following novel or
unusual design feature: Hydrophobic
windshield coating as the sole means to
maintain a clear portion of the
windshield, during precipitation
conditions, sufficient for both pilots to
have a sufficiently extensive view along
the flight path.
Discussion
Section 25.773(b)(1) requires that both
pilots of a transport category airplane be
provided a means to maintain a
sufficiently clear portion of the
windshield during precipitation
conditions, and that this clear portion of
the windshield must have a sufficiently
extensive view along the flight path.
The regulations require this means to
maintain such an area during
precipitation in heavy rain speeds up to
1.5 VSR1.
This requirement has existed in
principle since 1953 in Part 4b of the
Civil Air Regulations (CAR). Section
4b.351(b)(1) of CAR 4b required that
‘‘Means shall be provided for
maintaining a sufficient portion of the
windshield clear so that both pilots are
afforded a sufficiently extensive view
along the flight path in all normal flight
attitudes of the airplane. Such means
shall be designed to function under the
following conditions without
continuous attention on the part the
crew: (i) In heavy rain at speeds up to
1.6 VS1, flaps retracted.’’ Effective
December 26, 1990, Amendment 25–108
changed the criterion for effectiveness of
the means to maintain an area of clear
vision from 1.6 VS1 to 1.5 VSR1 to
accommodate the redefinition of the
reference stall speed as the 1–g stall
speed. As noted in the preamble to the
final rule for that amendment, the 7
percent decrease in the speed value
offsets a corresponding increase in the
reference stall speed associated with the
use of VSR1 rather than VS1.
The requirement that the means to
maintain a clear area of forward vision
must function at high speeds and high
precipitation rates is based on the use of
windshield wipers as the means to
maintain an adequate area of clear
vision in precipitation conditions. The
requirement in 14 CFR 121.313(b), and
in 14 CFR 125.213(b), to provide ‘‘a
windshield wiper or equivalent for each
PO 00000
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Fmt 4702
Sfmt 4702
pilot station’’ has remained unchanged
since at least 1953.
The effectiveness of windshield
wipers to maintain an area of clear
vision normally degrades as airflow and
precipitation rates increase. It is
assumed that because high speeds and
high precipitation rates represent
limiting conditions for windshield
wipers, they will also be effective at
lower speeds and precipitation levels.
Accordingly, § 25.773(b)(1)(i) does not
require maintenance of a clear area of
forward vision at lower speeds or lower
precipitation rates.
A forced air stream blown over the
windshield has also been used to
maintain an area of clear vision in
precipitation. The limiting conditions
for this technology are comparable to
those for windshield wipers.
Accordingly, introduction of this
technology did not present a need for
special conditions to maintain the level
of safety embodied in the existing
regulations.
Hydrophobic windshield coatings
may depend to some degree on airflow
to maintain a clear vision area. The
heavy rain and high-speed conditions
specified in the current rule do not
necessarily represent the limiting
conditions for this new technology. For
example, airflow over the windshield,
which may be necessary to remove
moisture from the windshield, may not
be adequate to maintain a sufficiently
clear area of the windshield in low
speed flight or during surface
operations. Alternately, airflow over the
windshield may be disturbed during
such critical times as the approach to
land, where the airplane is at a higher
than normal pitch attitude. In these
cases, areas of airflow disturbance or
separation on the windshield could
cause failure to maintain a clear vision
area on the windshield.
In addition to potentially depending
on airflow to function effectively,
hydrophobic coatings may also be
dependent on water droplet size for
effective precipitation removal. For
example, precipitation in the form of a
light mist may not be sufficient for the
coating’s properties to result in
maintaining a clear area of vision.
In summary, the current regulations
identify speed and precipitation rate
requirements that represent limiting
conditions for windshield wipers and
blowers, but not for hydrophobic
coatings, so it is necessary to issue
special conditions to maintain the level
of safety represented by the current
regulations.
These special conditions provide an
appropriate safety standard for the
hydrophobic coating technology as the
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Federal Register / Vol. 70, No. 125 / Thursday, June 30, 2005 / Proposed Rules
means to maintain a clear area of vision
by requiring it to be effective at low
speeds and precipitation rates as well as
the higher speeds and precipitation
rates identified in the current
regulation. These are the only new or
changed requirements relative to those
in § 25.773(b)(1) at Amendment 25–108.
Applicability
As discussed above, these special
conditions are applicable to the Model
G150. Should GALP apply at a later date
for a change to the type certificate to
include other type designs incorporating
the same novel or unusual design
feature, the special conditions would
apply to that model as well.
Conclusion
This action affects only certain novel
or unusual design features on one model
of airplanes. It is not a rule of general
applicability.
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting
and recordkeeping requirements.
The authority citation for these
special conditions is as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701,
44702, 44704.
The Proposed Special Conditions
Accordingly, the Federal Aviation
Administration (FAA) proposes the
following special conditions as part of
the type certification basis for
Gulfstream Aerospace Limited
Partnership (GALP) Model G150
airplane.
Pilot Compartment View—
Hydrophobic Coatings in Lieu of
Windshield Wipers. The airplane must
have a means to maintain a clear portion
of the windshield, during precipitation
conditions, enough for both pilots to
have a sufficiently extensive view along
the flight path in normal flight attitudes
of the airplane. This means must be
designed to function, without
continuous attention on the part of the
crew, in conditions from light misting
precipitation to heavy rain at speeds
from fully stopped in still air, to 1.5
VSR1 with lift and drag devices retracted.
Issued in Renton, Washington, on June 21,
2005.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 05–12883 Filed 6–29–05; 8:45 am]
BILLING CODE 4910–13–M
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Jkt 205001
DEPARTMENT OF ENERGY
Federal Energy Regulatory
Commission
18 CFR Part 284
[Docket Nos. PL05–8–000 and RM04–4–000]
Policy Statement on Creditworthiness
for Interstate Natural Gas Pipelines
and Order Withdrawing Rulemaking
Proceeding
Issued June 16, 2005.
Federal Energy Regulatory
Commission, DOE.
ACTION: Proposed rule; withdrawal;
policy statement.
AGENCY:
SUMMARY: On February 2, 2004, the
Federal Energy Regulatory Commission
(Commission) issued a notice of
proposed rulemaking (NOPR) proposing
to amend its open access regulations
governing capacity release and
standards for business practices and
electronic communications with
interstate natural gas pipelines. The
NOPR proposed to incorporate by
reference ten creditworthiness standards
promulgated by the Wholesale Gas
Quadrant of the North American Energy
Standards Board (NAESB) and adopt
additional regulations related to the
creditworthiness of shippers on
interstate natural gas pipelines. The
Commission adopted the NAESB
creditworthiness standards in Docket
No. RM96–1–026 (70 FR 28204), and is
now issuing a policy statement on
creditworthiness. Therefore, the
proposed rulemaking in Docket No.
RM04–4–000 is withdrawn.
DATES: The withdrawal of the proposed
rulemaking is made on the date of
publication in the Federal Register.
FOR FURTHER INFORMATION CONTACT:
David Faerberg, Office of the General
Counsel, Federal Energy Regulatory
Commission, 888 First Street, NE.,
Washington, DC 20426, (202)–502–8275,
david.faerberg@ferc.gov.
Frank Karabetsos, Office of the
General Counsel, Federal Energy
Regulatory Commission, 888 First
Street, NE., Washington, DC 20426,
(202)–502–8133,
frank.karabetsos@ferc.gov.
SUPPLEMENTARY INFORMATION:
Before Commissioners: Pat Wood, III,
Chairman; Nora Mead Brownell, Joseph T.
Kelliher, and Suedeen G. Kelly.
1. The Commission is issuing a policy
statement setting forth its approach to
credit issues relating to transportation
on natural gas pipelines. The policy
statement is intended to provide the
PO 00000
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37717
industry with guidance on the
Commission’s policies with respect to
credit and the way in which the
Commission will evaluate future
proceedings involving changes to the
creditworthiness provisions of pipeline
tariffs.
I. Background
2. In 2002, a number of interstate
natural gas pipelines made filings with
the Commission to revise the
creditworthiness provisions in their
tariffs. These pipelines claimed that,
due to increased credit rating
downgrades for many energy
companies, industry attention has
focused on issues relating to a pipeline’s
risk profile and its credit exposure. The
pipelines argued that tariff revisions are
needed to strengthen creditworthiness
provisions and minimize the risk to the
pipeline and its shippers in the event
that a shipper defaults on its
obligations.
3. In September 2002, the
Commission issued orders that began to
examine and investigate issues relating
to a pipeline’s ability to determine the
creditworthiness of its shippers.1
Several parties in these proceedings
requested that the Commission develop
uniform guidelines for pipeline
creditworthiness provisions. The parties
argued that generic guidelines would
reduce the potential burden faced by
customers who otherwise would need to
comply with inconsistent and overly
burdensome credit requirements.
4. The Commission concluded that
developing generic standards for
creditworthiness determination could
be valuable since shippers would be
able to provide the same documents to
every pipeline to obtain capacity. The
Commission encouraged the parties to
initiate the standards development
process at the Wholesale Gas Quadrant
(WGQ) of the North American Energy
Standards Board (NAESB) to see
whether a consensus standard could be
developed for creditworthiness
determinations. In June 2003, NAESB
filed a progress report with the
Commission in Docket No. RM96–1–000
stating that its Wholesale Gas Quadrant
had adopted ten standards relating to
creditworthiness. A number of parties
filed comments with the Commission
after NAESB filed its report.
5. On February 2, 2004, the
Commission issued a Notice of
Proposed Rulemaking (NOPR) in Docket
1 See Tennessee Gas Pipeline Co., 100 FERC
¶ 61,267 (2002); Northern Natural Gas Co., 100
FERC ¶ 61,278 (2002); Natural Gas Pipline Co. of
America, 101 FERC ¶ 61,269 (2002).
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]]>Agencies
[Federal Register Volume 70, Number 125 (Thursday, June 30, 2005)]
[Proposed Rules]
[Pages 37715-37717]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-12883]
=======================================================================
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM310; Notice No. 25-05-07-SC]
Special Conditions: Gulfstream Aerospace Limited Partnership
(GALP) Model G150 Airplane; Windshield Coating in Lieu of Wipers
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed special conditions.
-----------------------------------------------------------------------
SUMMARY: This notice proposes special conditions for the Gulfstream
Aerospace Limited Partnership (GALP) Model G150 airplane. This airplane
will have a novel or unusual design feature associated with use of a
hydrophobic coating, rather than windshield wipers, as the means to
maintain a clear portion of the windshield during precipitation
conditions, as required by the airworthiness standards for transport
category airplanes. The applicable airworthiness regulations do not
contain adequate or appropriate safety standards for this design
feature. These proposed special conditions contain the additional
safety standards that the Administrator considers necessary to
establish a level of safety equivalent to that established by the
existing airworthiness standards.
DATES: Comments must be received on or before August 15, 2005.
ADDRESSES: Comments on this proposal may be mailed in duplicate to:
Federal Aviation Administration, Transport Airplane Directorate, Attn:
Rules Docket (ANM-113), Docket No. NM310, 1601 Lind Avenue SW., Renton,
Washington 98055-4056; or delivered in duplicate to the Transport
Airplane Directorate at the above address. Comments must be marked:
Docket No. NM310. Comments may be inspected in the Rules Docket
weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.
FOR FURTHER INFORMATION CONTACT: John McConnell, Airplane and Flight
Crew Interface Branch, ANM-111, Transport Airplane Directorate,
Aircraft Certification Service, 1601 Lind Avenue SW., Renton,
Washington 98055-4056; telephone (425) 227-1365; facsimile (425) 227-
1320, e-mail john.mcconnell@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites interested persons to participate in this
rulemaking by submitting written comments, data, or views. The most
helpful comments reference a specific portion of the special
conditions, explain the reason for any recommended change, and include
supporting data. We ask that you send us two copies of written
comments.
We will file in the docket all comments we receive, as well as a
report summarizing each substantive public contact with FAA personnel
concerning these special conditions. The docket is available for public
inspection before and after the comment closing date. If you wish to
review the docket in person, go to the address in the ADDRESSES section
of this preamble between 9 a.m. and 5 p.m., Monday through Friday,
except Federal holidays.
We will consider all comments we receive on or before the closing
date for comments. We will consider comments filed late if it is
possible to do so without incurring expense or delay. We may change
these special conditions in light of the comments we receive.
If you want the FAA to acknowledge receipt of your comments on this
proposal, include with your comments a pre-addressed, stamped postcard
on which the docket number appears. We will stamp the date on the
postcard and mail it back to you.
Background
On September 22, 2002, GALP applied for an amendment to Type
Certificate Number A16NM to include the new GALP Model G150 airplane.
The GALP Model G150, which is a derivative of the GALP Model G100
currently approved under Type Certificate Number A16NM, is intended to
be a nine passenger executive airplane with a maximum takeoff weight of
26,000 pounds and a maximum operating altitude of 45,000 feet.
The GALP Model G150 flightdeck design incorporates a hydrophobic
coating to provide adequate pilot
[[Page 37716]]
compartment view in the presence of precipitation. Sole reliance on
such a coating, without windshield wipers, constitutes a novel or
unusual design feature for which the applicable airworthiness
regulations do not contain adequate or appropriate safety standards.
Therefore, special conditions are required that provides the level of
safety equivalent to that established by the regulations.
Type Certification Basis
Under the provisions of 14 CFR 21.101, GALP must show that the
Model G150 meets the applicable provisions of the regulations
incorporated by reference in Type Certificate Number A16NM or the
applicable regulations in effect on the date of application for the
change to the type certificate. The regulations incorporated by
reference in the type certificate are commonly referred to as the
``original type certification basis.'' The regulations incorporated by
reference in Type Certificate Number A16NM are 14 CFR part 25,
effective February 1, 1965, including Amendments 25-1 through 25-107.
In addition, if the regulations incorporated by reference do not
provide adequate standards with respect to the change, the applicant
must comply with certain regulations in effect on the date of
application for the change. GALP has elected to voluntarily comply with
Amendment 25-108 for the G150 type certification program.
If the Administrator finds that the applicable airworthiness
regulations (i.e., 14 CFR part 25) do not contain adequate or
appropriate safety standards for the Model G150 because of a novel or
unusual design feature, special conditions are prescribed under the
provisions of Sec. 21.16.
In addition to the applicable airworthiness regulations and special
conditions, the Model G150 must comply with (1) either the ``No
Acoustical Change'' provisions of Sec. 21.93(b) or 14 CFR part 36, as
amended by Amendments 36-1 thru 36-24, and (2) either the ``No Emission
Change'' provisions of Sec. 21.93(c) or 14 CFR part 34, as amended by
Amendments 34-1 through 34-3.
Special conditions, as defined in 14 CFR 11.19, are issued in
accordance with Sec. 11.38 and become part of the type certification
basis in accordance with Sec. 21.101.
Special conditions are initially applicable to the model for which
they are issued. Should the type certificate for that model be amended
later to include any other model that incorporates the same or similar
novel or unusual design feature, or should any other model already
included on the same type certificate be modified to incorporate the
same novel or unusual design feature, the special conditions would also
apply to the other model under the provisions of Sec. 21.101.
Novel or Unusual Design Features
The GALP Mode G150 will incorporate the following novel or unusual
design feature: Hydrophobic windshield coating as the sole means to
maintain a clear portion of the windshield, during precipitation
conditions, sufficient for both pilots to have a sufficiently extensive
view along the flight path.
Discussion
Section 25.773(b)(1) requires that both pilots of a transport
category airplane be provided a means to maintain a sufficiently clear
portion of the windshield during precipitation conditions, and that
this clear portion of the windshield must have a sufficiently extensive
view along the flight path. The regulations require this means to
maintain such an area during precipitation in heavy rain speeds up to
1.5 VSR1.
This requirement has existed in principle since 1953 in Part 4b of
the Civil Air Regulations (CAR). Section 4b.351(b)(1) of CAR 4b
required that ``Means shall be provided for maintaining a sufficient
portion of the windshield clear so that both pilots are afforded a
sufficiently extensive view along the flight path in all normal flight
attitudes of the airplane. Such means shall be designed to function
under the following conditions without continuous attention on the part
the crew: (i) In heavy rain at speeds up to 1.6 VS1, flaps
retracted.'' Effective December 26, 1990, Amendment 25-108 changed the
criterion for effectiveness of the means to maintain an area of clear
vision from 1.6 VS1 to 1.5 VSR1 to accommodate
the redefinition of the reference stall speed as the 1-g stall speed.
As noted in the preamble to the final rule for that amendment, the 7
percent decrease in the speed value offsets a corresponding increase in
the reference stall speed associated with the use of VSR1
rather than VS1.
The requirement that the means to maintain a clear area of forward
vision must function at high speeds and high precipitation rates is
based on the use of windshield wipers as the means to maintain an
adequate area of clear vision in precipitation conditions. The
requirement in 14 CFR 121.313(b), and in 14 CFR 125.213(b), to provide
``a windshield wiper or equivalent for each pilot station'' has
remained unchanged since at least 1953.
The effectiveness of windshield wipers to maintain an area of clear
vision normally degrades as airflow and precipitation rates increase.
It is assumed that because high speeds and high precipitation rates
represent limiting conditions for windshield wipers, they will also be
effective at lower speeds and precipitation levels. Accordingly, Sec.
25.773(b)(1)(i) does not require maintenance of a clear area of forward
vision at lower speeds or lower precipitation rates.
A forced air stream blown over the windshield has also been used to
maintain an area of clear vision in precipitation. The limiting
conditions for this technology are comparable to those for windshield
wipers. Accordingly, introduction of this technology did not present a
need for special conditions to maintain the level of safety embodied in
the existing regulations.
Hydrophobic windshield coatings may depend to some degree on
airflow to maintain a clear vision area. The heavy rain and high-speed
conditions specified in the current rule do not necessarily represent
the limiting conditions for this new technology. For example, airflow
over the windshield, which may be necessary to remove moisture from the
windshield, may not be adequate to maintain a sufficiently clear area
of the windshield in low speed flight or during surface operations.
Alternately, airflow over the windshield may be disturbed during such
critical times as the approach to land, where the airplane is at a
higher than normal pitch attitude. In these cases, areas of airflow
disturbance or separation on the windshield could cause failure to
maintain a clear vision area on the windshield.
In addition to potentially depending on airflow to function
effectively, hydrophobic coatings may also be dependent on water
droplet size for effective precipitation removal. For example,
precipitation in the form of a light mist may not be sufficient for the
coating's properties to result in maintaining a clear area of vision.
In summary, the current regulations identify speed and
precipitation rate requirements that represent limiting conditions for
windshield wipers and blowers, but not for hydrophobic coatings, so it
is necessary to issue special conditions to maintain the level of
safety represented by the current regulations.
These special conditions provide an appropriate safety standard for
the hydrophobic coating technology as the
[[Page 37717]]
means to maintain a clear area of vision by requiring it to be
effective at low speeds and precipitation rates as well as the higher
speeds and precipitation rates identified in the current regulation.
These are the only new or changed requirements relative to those in
Sec. 25.773(b)(1) at Amendment 25-108.
Applicability
As discussed above, these special conditions are applicable to the
Model G150. Should GALP apply at a later date for a change to the type
certificate to include other type designs incorporating the same novel
or unusual design feature, the special conditions would apply to that
model as well.
Conclusion
This action affects only certain novel or unusual design features
on one model of airplanes. It is not a rule of general applicability.
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting and recordkeeping
requirements.
The authority citation for these special conditions is as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704.
The Proposed Special Conditions
Accordingly, the Federal Aviation Administration (FAA) proposes the
following special conditions as part of the type certification basis
for Gulfstream Aerospace Limited Partnership (GALP) Model G150
airplane.
Pilot Compartment View--Hydrophobic Coatings in Lieu of Windshield
Wipers. The airplane must have a means to maintain a clear portion of
the windshield, during precipitation conditions, enough for both pilots
to have a sufficiently extensive view along the flight path in normal
flight attitudes of the airplane. This means must be designed to
function, without continuous attention on the part of the crew, in
conditions from light misting precipitation to heavy rain at speeds
from fully stopped in still air, to 1.5 VSR1 with lift and
drag devices retracted.
Issued in Renton, Washington, on June 21, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-12883 Filed 6-29-05; 8:45 am]
BILLING CODE 4910-13-M
