Airworthiness Directives; Boeing Model 727 Airplanes, 67873-67875 [E7-23342]

Download as PDF Federal Register / Vol. 72, No. 231 / Monday, December 3, 2007 / Proposed Rules apply fillet seal and sealant as applicable to the affected areas according to the Accomplishment Instructions of Bombardier Service Bulletin 601R–28–060, Revision A, dated March 30, 2005. (4) Application of sealant prior to the effective date of this AD according to Bombardier Service bulletin 601R–28–051, dated May 12, 2003, satisfies the requirements of paragraph (f)(1) of this AD. (5) Inspection and application of sealant and fillet seal prior to the effective date of this AD according to Bombardier Service Bulletin 601R–28–060, dated January 28, 2004, satisfy the corresponding requirements of paragraphs (f)(2) and (f)(3) of this AD. FAA AD Differences Note: This AD differs from the MCAI and/ or service information as follows: No Differences. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Rocco Viselli, Aerospace Engineer, Airframe and Propulsion Branch, ANE–171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228–7331; fax (516) 794–5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAAapproved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120–0056. Related Information yshivers on PROD1PC62 with PROPOSALS (h) Refer to MCAI Canadian Airworthiness Directive CF–2007–17, dated September 4, 2007, and Bombardier Service Bulletins 601R–28–051 and 601R–28–060, both Revision A, both dated March 30, 2005, for related information. Issued in Renton, Washington, on November 23, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–23339 Filed 11–30–07; 8:45 am] BILLING CODE 4910–13–P VerDate Aug<31>2005 14:41 Nov 30, 2007 Jkt 214001 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2007–0265; Directorate Identifier 2007–NM–213–AD] RIN 2120–AA64 Airworthiness Directives; Boeing Model 727 Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 727 airplanes. This proposed AD would require repetitive inspections for any cracking of or damage to the left side and right side flight deck No. 2, No. 4, and No. 5 windows, as necessary, and corrective actions if necessary. This proposed AD results from reports of in-flight departure and separation of the flight deck windows. We are proposing this AD to detect and correct cracking in the vinyl interlayer or damage to the structural inner glass panes of the flight deck No. 2, No. 4, and No. 5 windows, which could result in loss of a window and rapid loss of cabin pressure. Loss of cabin pressure could cause crew communication difficulties or crew incapacitation. We must receive comments on this proposed AD by January 17, 2008. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this AD, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124–2207. DATES: Examining the AD Docket You may examine the AD docket on the Internet at http:// www.regulations.gov; or in person at the PO 00000 Frm 00010 Fmt 4702 Sfmt 4702 67873 Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (telephone 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Berhane Alazar, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 917–6577; fax (425) 917–6590. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2007–0265; Directorate Identifier 2007–NM–213–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD because of those comments. We will post all comments we receive, without change, to http:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. Discussion We have received one report of inflight departure of the flight deck No. 3 window, on a Boeing Model 747 series airplane, which resulted in rapid loss of cabin pressure and an emergency landing. That airplane had accumulated 36,131 total flight hours and 5,607 total flight cycles. We have also received two reports of in-flight separation of the left side flight deck No. 5 window, on two Boeing Model 737 series airplanes. One of the Model 737 series airplanes experienced cabin pressure loss at 12,500 feet due to separation of the forward, aft, and upper edges of the left side flight deck No. 5 window. That airplane had accumulated 25,673 total flight hours and 15,669 total flight cycles. The other Model 737 series airplane experienced a pressure leak at 29,000 feet due to partial separation of the upper aft corner of the left side flight deck No. 5 window. That airplane had E:\FR\FM\03DEP1.SGM 03DEP1 67874 Federal Register / Vol. 72, No. 231 / Monday, December 3, 2007 / Proposed Rules accumulated 28,139 total flight hours and 16,566 total flight cycles. Vinyl interlayer cracking of the flight deck No. 2, No. 4, and No. 5 windows could decrease the load carrying capability of the affected windows during cabin pressurization if the structural glass pane of the window becomes broken. Vinyl interlayer cracking could also decrease the bird impact resistance capability of the flight deck No. 2 and No. 4 windows. Cracking in the vinyl interlayer or damage to the structural inner glass panes of the flight deck No. 2, No. 4, and No. 5 windows, if not corrected, could result in loss of a window and rapid loss of cabin pressure. Loss of cabin pressure could cause crew communication difficulties or crew incapacitation. The window construction and operating environment on the Model 737 airplanes and Model 747 airplanes are similar to those on the affected Boeing Model 727 airplanes. Therefore, all of these models are also subject to the same unsafe condition. yshivers on PROD1PC62 with PROPOSALS Other Related Rulemaking On July 18, 2007, we issued AD 2007– 15–10, amendment 39–15139 (72 FR 41438, July 30, 2007), to address the unsafe condition on all Model 747 airplanes. A correction was issued on September 10, 2007 (72 FR 53923, September 21, 2007), to fix a typographical error in AD 2007–15–10. That AD requires an inspection of the No. 2 and No. 3 windows on the left and right sides of the airplane to determine their part numbers, and related investigative and corrective actions if necessary. On October 5, 2007, we issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an airworthiness directive (AD) that would apply to all Boeing Model 737–100, –200, –200C, –300, –400, and –500 series airplanes. That NPRM was published in the Federal Register on October 17, 2007 (72 FR 58766). That NPRM proposed to require repetitive inspections for any cracking of or damage to the left side and right side flight deck No. 2, No. 4, and No. 5 windows and corrective actions if necessary. Relevant Service Information We have reviewed Boeing Alert Service Bulletin 727–56A0019, dated June 6, 2007. The service bulletin describes procedures for doing repetitive internal and external detailed inspections for any cracking of or damage to the left side and right side flight deck No. 2, No. 4, and No. 5 windows, as applicable, that exceeds the limits given in the Accomplishment VerDate Aug<31>2005 14:41 Nov 30, 2007 Jkt 214001 Instructions of the service bulletin. The service bulletin specifies an initial compliance time ranging between 6 months and 24 months, depending on the window location and number of window flight hours. If a replacement window is not new or has an unknown number of flight hours, the service bulletin specifies accomplishing the initial inspections before installation. If a replacement window is new or has zero flight hours, the service bulletin specifies accomplishing the initial inspections at the following times: (1) 7,500 window flight hours or 36 months, whichever occurs first, for flight deck No. 2 windows, and (2) 6,000 window flight hours or 24 months, whichever occurs first, for flight deck No. 4 and No. 5 windows. The service bulletin also specifies a repetitive interval of (1) 7,500 window flight hours or 36 months, whichever occurs first, for flight deck No. 2 windows, and (2) 6,000 window flight hours or 24 months, whichever occurs first, for flight deck No. 4 and No. 5 windows. The service bulletin also describes procedures for accomplishing corrective actions if necessary. The corrective actions include replacing any cracked or damaged window with a new or serviceable window. The service bulletin specifies accomplishing the corrective actions before further flight. Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition. FAA’s Determination and Requirements of the Proposed AD We have evaluated all pertinent information and identified an unsafe condition that is likely to exist or develop on other airplanes of this same type design. For this reason, we are proposing this AD, which would require accomplishing the actions specified in the service information described previously. Costs of Compliance There are about 790 airplanes of the affected design in the worldwide fleet. This proposed AD would affect about 431 airplanes of U.S. registry. The proposed actions would take about 2 work hours per airplane, at an average labor rate of $80 per work hour. Based on these figures, the estimated cost of the proposed AD for U.S. operators is $68,960, or $160 per airplane, per inspection cycle. Authority for This Rulemaking Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, PO 00000 Frm 00011 Fmt 4702 Sfmt 4702 Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency’s authority. We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, ‘‘General requirements.’’ Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Regulatory Findings We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD 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. For the reasons discussed above, I certify that the proposed regulation: 1. Is not a ‘‘significant regulatory action’’ under Executive Order 12866; 2. Is not a ‘‘significant rule’’ under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and 3. Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the AD docket. See the ADDRESSES section for a location to examine the regulatory evaluation. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. E:\FR\FM\03DEP1.SGM 03DEP1 Federal Register / Vol. 72, No. 231 / Monday, December 3, 2007 / Proposed Rules § 39.13 [Amended] 2. The Federal Aviation Administration (FAA) amends § 39.13 by adding the following new airworthiness directive (AD): Boeing: Docket No. FAA–2007–0265; Directorate Identifier 2007–NM–213–AD. Comments Due Date (a) The FAA must receive comments on this AD action by January 17, 2008. Affected ADs (b) None. Applicability (c) This AD applies to all Boeing Model 727, 727C, 727–100, 727–100C, 727–200, and 727–200F series airplanes, certificated in any category. Unsafe Condition (d) This AD results from reports of in-flight departure and separation of the flight deck windows. We are issuing this AD to detect and correct cracking in the vinyl interlayer or damage to the structural inner glass panes of the flight deck No. 2, No. 4, and No. 5 windows, which could result in loss of a window and rapid loss of cabin pressure. Loss of cabin pressure could cause crew communication difficulties or crew incapacitation. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Repetitive Inspections and Replacement (f) At the applicable times specified in Tables 1, 2, and 3 of paragraph 1.E. of Boeing Alert Service Bulletin 727–56A0019, dated June 6, 2007, except as provided by paragraph (g) of this AD: Do the internal and external detailed inspections for any cracking of or damage to the left side and right side flight deck No. 2, No. 4, and No. 5 windows, as applicable, and do the applicable corrective actions before further flight, by accomplishing all of the applicable actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 727–56A0019, dated June 6, 2007. Repeat the inspections thereafter at the applicable interval specified in paragraph 1.E. of Boeing Alert Service Bulletin 727–56A0019, dated June 6, 2007. yshivers on PROD1PC62 with PROPOSALS Exception to Compliance Times (g) Where Tables 1, 2, and 3 of paragraph 1.E. of Boeing Alert Service Bulletin 727– 56A0019, dated June 6, 2007, specify counting the compliance time from ‘‘ * * * the date on this service bulletin,’’ this AD requires counting the compliance time from the effective date of this AD. Alternative Methods of Compliance (AMOCs) (h)(1) The Manager, Seattle Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. VerDate Aug<31>2005 14:41 Nov 30, 2007 Jkt 214001 (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (3) An AMOC that provides an acceptable level of safety may be used for any repair required by this AD, if it is approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make those findings. For a repair method to be approved, the repair must meet the certification basis of the airplane, and the approval must specifically refer to this AD. (4) Installation of metallic window blanks at cockpit eyebrow windows No. 4 and No. 5 in accordance with Supplemental Type Certificate ST01704SE is approved as an alternative means of compliance with the initial and repetitive inspections for the flight deck No. 4 and No. 5 windows required by paragraph (f) of this AD. All other applicable actions required by paragraph (f) of this AD must be fully complied with. Issued in Renton, Washington, on November 7, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–23342 Filed 11–30–07; 8:45 am] BILLING CODE 4910–13–P DELAWARE RIVER BASIN COMMISSION 18 CFR Part 410 Proposed Rulemaking To Implement a Flexible Flow Management Program for the New York City Delaware Basin Reservoirs Delaware River Basin Commission. ACTION: Notice of public hearing and informational meetings. AGENCY: SUMMARY: The Delaware River Basin Commission (‘‘Commission’’ or ‘‘DRBC’’) will hold a public hearing to receive comments on proposed amendments to its Water Code and Comprehensive Plan to implement a Flexible Flow Management Program (‘‘FFMP’’) for the New York City Delaware River Basin reservoirs. The proposed amendments are consistent with provisions of an agreement dated September 26, 2007 among the parties to the 1954 Supreme Court decree in New Jersey v. New York—the states of Delaware, New Jersey, and New York, the Commonwealth of Pennsylvania and the City of New York—that provide a comprehensive framework for PO 00000 Frm 00012 Fmt 4702 Sfmt 4702 67875 addressing multiple flow management objectives, including water supply, drought mitigation, flood mitigation, protection of the tailwaters fishery, a diverse array of habitat needs in the main stem Delaware River, the Delaware Estuary and Delaware Bay, recreational uses and salinity repulsion. DATES: The public hearing will take place on Wednesday, January 16, 2008, from 3 p.m. to 5:30 p.m. and from 7 p.m. to 10 p.m. or until all those who wish to testify have had an opportunity to do so. Persons wishing to testify are asked to register in advance with the Commission Secretary at (609) 883– 9500 ext. 224. Written comments will be accepted through the close of business on Friday, January 18, 2008. All testimony and written comments submitted to the Commission during its previous hearings or comment period on the FFMP, including comments on the form of the FFMP that was published on the Commission’s Web site in February 2007, will be included in the administrative record for this action and need not be re-submitted. Four informational meetings on the proposed amendments will be held. The first two meetings will take place on Tuesday, December 18, 2007 from 3 p.m. to 5 p.m. and from 6:30 p.m. to 9:30 p.m. The second two meetings will take place on Tuesday, January 8, 2008 from 3 p.m. to 5 p.m. and from 6:30 p.m. to 9:30 p.m. Each meeting will consist of an informational presentation followed by questions and answers. ADDRESSES: The January 16, 2008 public hearing will take place at the West Trenton Volunteer Fire Company, 40 West Upper Ferry Road, West Trenton, NJ. The December 18, 2007 informational meetings will take place at the Best Western Inn at Hunt’s Landing, 120 Routes 6 and 209, Matamoras, PA. The January 8, 2008 informational meetings will take place at the offices of Wolf, Block, Schorr and Solis-Cohen LLP, 1650 Arch Street, 26th Floor, Philadelphia, PA. Directions to the hearing and meeting locations are available via links on the DRBC Web site. Written comments may be submitted by e-mail to paula.schmitt@drbc.state.nj.us; by U.S. Mail to Commission Secretary, DRBC, P.O. Box 7360, West Trenton, NJ 08628– 0360; or by fax to 609–883–9522. In all cases, the commenter’s name, affiliation, and address should be provided in the comment document, and ‘‘FFMP’’ should appear in the subject line. FOR FURTHER INFORMATION CONTACT: For further information about the rulemaking process, please contact Pamela M. Bush, Commission Secretary E:\FR\FM\03DEP1.SGM 03DEP1

Agencies

[Federal Register Volume 72, Number 231 (Monday, December 3, 2007)]
[Proposed Rules]
[Pages 67873-67875]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-23342]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-0265; Directorate Identifier 2007-NM-213-AD]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 727 Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for all Boeing Model 727 airplanes. This proposed AD would require 
repetitive inspections for any cracking of or damage to the left side 
and right side flight deck No. 2, No. 4, and No. 5 windows, as 
necessary, and corrective actions if necessary. This proposed AD 
results from reports of in-flight departure and separation of the 
flight deck windows. We are proposing this AD to detect and correct 
cracking in the vinyl interlayer or damage to the structural inner 
glass panes of the flight deck No. 2, No. 4, and No. 5 windows, which 
could result in loss of a window and rapid loss of cabin pressure. Loss 
of cabin pressure could cause crew communication difficulties or crew 
incapacitation.

DATES: We must receive comments on this proposed AD by January 17, 
2008.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://
www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    For service information identified in this AD, contact Boeing 
Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
www.regulations.gov; or in person at the Docket Management Facility 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains this proposed AD, the regulatory 
evaluation, any comments received, and other information. The street 
address for the Docket Office (telephone 800-647-5527) is in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

FOR FURTHER INFORMATION CONTACT: Berhane Alazar, Aerospace Engineer, 
Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 
1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 
917-6577; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2007-0265; 
Directorate Identifier 2007-NM-213-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD because of those comments.
    We will post all comments we receive, without change, to http://
www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    We have received one report of in-flight departure of the flight 
deck No. 3 window, on a Boeing Model 747 series airplane, which 
resulted in rapid loss of cabin pressure and an emergency landing. That 
airplane had accumulated 36,131 total flight hours and 5,607 total 
flight cycles. We have also received two reports of in-flight 
separation of the left side flight deck No. 5 window, on two Boeing 
Model 737 series airplanes. One of the Model 737 series airplanes 
experienced cabin pressure loss at 12,500 feet due to separation of the 
forward, aft, and upper edges of the left side flight deck No. 5 
window. That airplane had accumulated 25,673 total flight hours and 
15,669 total flight cycles. The other Model 737 series airplane 
experienced a pressure leak at 29,000 feet due to partial separation of 
the upper aft corner of the left side flight deck No. 5 window. That 
airplane had

[[Page 67874]]

accumulated 28,139 total flight hours and 16,566 total flight cycles. 
Vinyl interlayer cracking of the flight deck No. 2, No. 4, and No. 5 
windows could decrease the load carrying capability of the affected 
windows during cabin pressurization if the structural glass pane of the 
window becomes broken. Vinyl interlayer cracking could also decrease 
the bird impact resistance capability of the flight deck No. 2 and No. 
4 windows. Cracking in the vinyl interlayer or damage to the structural 
inner glass panes of the flight deck No. 2, No. 4, and No. 5 windows, 
if not corrected, could result in loss of a window and rapid loss of 
cabin pressure. Loss of cabin pressure could cause crew communication 
difficulties or crew incapacitation.
    The window construction and operating environment on the Model 737 
airplanes and Model 747 airplanes are similar to those on the affected 
Boeing Model 727 airplanes. Therefore, all of these models are also 
subject to the same unsafe condition.

Other Related Rulemaking

    On July 18, 2007, we issued AD 2007-15-10, amendment 39-15139 (72 
FR 41438, July 30, 2007), to address the unsafe condition on all Model 
747 airplanes. A correction was issued on September 10, 2007 (72 FR 
53923, September 21, 2007), to fix a typographical error in AD 2007-15-
10. That AD requires an inspection of the No. 2 and No. 3 windows on 
the left and right sides of the airplane to determine their part 
numbers, and related investigative and corrective actions if necessary. 
On October 5, 2007, we issued a notice of proposed rulemaking (NPRM) to 
amend 14 CFR part 39 to include an airworthiness directive (AD) that 
would apply to all Boeing Model 737-100, -200, -200C, -300, -400, and -
500 series airplanes. That NPRM was published in the Federal Register 
on October 17, 2007 (72 FR 58766). That NPRM proposed to require 
repetitive inspections for any cracking of or damage to the left side 
and right side flight deck No. 2, No. 4, and No. 5 windows and 
corrective actions if necessary.

Relevant Service Information

    We have reviewed Boeing Alert Service Bulletin 727-56A0019, dated 
June 6, 2007. The service bulletin describes procedures for doing 
repetitive internal and external detailed inspections for any cracking 
of or damage to the left side and right side flight deck No. 2, No. 4, 
and No. 5 windows, as applicable, that exceeds the limits given in the 
Accomplishment Instructions of the service bulletin. The service 
bulletin specifies an initial compliance time ranging between 6 months 
and 24 months, depending on the window location and number of window 
flight hours. If a replacement window is not new or has an unknown 
number of flight hours, the service bulletin specifies accomplishing 
the initial inspections before installation. If a replacement window is 
new or has zero flight hours, the service bulletin specifies 
accomplishing the initial inspections at the following times: (1) 7,500 
window flight hours or 36 months, whichever occurs first, for flight 
deck No. 2 windows, and (2) 6,000 window flight hours or 24 months, 
whichever occurs first, for flight deck No. 4 and No. 5 windows. The 
service bulletin also specifies a repetitive interval of (1) 7,500 
window flight hours or 36 months, whichever occurs first, for flight 
deck No. 2 windows, and (2) 6,000 window flight hours or 24 months, 
whichever occurs first, for flight deck No. 4 and No. 5 windows.
    The service bulletin also describes procedures for accomplishing 
corrective actions if necessary. The corrective actions include 
replacing any cracked or damaged window with a new or serviceable 
window. The service bulletin specifies accomplishing the corrective 
actions before further flight.
    Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition.

FAA's Determination and Requirements of the Proposed AD

    We have evaluated all pertinent information and identified an 
unsafe condition that is likely to exist or develop on other airplanes 
of this same type design. For this reason, we are proposing this AD, 
which would require accomplishing the actions specified in the service 
information described previously.

Costs of Compliance

    There are about 790 airplanes of the affected design in the 
worldwide fleet. This proposed AD would affect about 431 airplanes of 
U.S. registry. The proposed actions would take about 2 work hours per 
airplane, at an average labor rate of $80 per work hour. Based on these 
figures, the estimated cost of the proposed AD for U.S. operators is 
$68,960, or $160 per airplane, per inspection cycle.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. 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.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD 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.
    For the reasons discussed above, I certify that the proposed 
regulation:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979); and
    3. Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket. See the 
ADDRESSES section for a location to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

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

[[Page 67875]]

Sec.  39.13  [Amended]

    2. The Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

Boeing: Docket No. FAA-2007-0265; Directorate Identifier 2007-NM-
213-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by January 
17, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all Boeing Model 727, 727C, 727-100, 727-
100C, 727-200, and 727-200F series airplanes, certificated in any 
category.

Unsafe Condition

    (d) This AD results from reports of in-flight departure and 
separation of the flight deck windows. We are issuing this AD to 
detect and correct cracking in the vinyl interlayer or damage to the 
structural inner glass panes of the flight deck No. 2, No. 4, and 
No. 5 windows, which could result in loss of a window and rapid loss 
of cabin pressure. Loss of cabin pressure could cause crew 
communication difficulties or crew incapacitation.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Repetitive Inspections and Replacement

    (f) At the applicable times specified in Tables 1, 2, and 3 of 
paragraph 1.E. of Boeing Alert Service Bulletin 727-56A0019, dated 
June 6, 2007, except as provided by paragraph (g) of this AD: Do the 
internal and external detailed inspections for any cracking of or 
damage to the left side and right side flight deck No. 2, No. 4, and 
No. 5 windows, as applicable, and do the applicable corrective 
actions before further flight, by accomplishing all of the 
applicable actions specified in the Accomplishment Instructions of 
Boeing Alert Service Bulletin 727-56A0019, dated June 6, 2007. 
Repeat the inspections thereafter at the applicable interval 
specified in paragraph 1.E. of Boeing Alert Service Bulletin 727-
56A0019, dated June 6, 2007.

Exception to Compliance Times

    (g) Where Tables 1, 2, and 3 of paragraph 1.E. of Boeing Alert 
Service Bulletin 727-56A0019, dated June 6, 2007, specify counting 
the compliance time from `` * * * the date on this service 
bulletin,'' this AD requires counting the compliance time from the 
effective date of this AD.

Alternative Methods of Compliance (AMOCs)

    (h)(1) The Manager, Seattle Aircraft Certification Office (ACO), 
FAA, has the authority to approve AMOCs for this AD, if requested in 
accordance with the procedures found in 14 CFR 39.19.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your appropriate principal inspector (PI) in the FAA 
Flight Standards District Office (FSDO), or lacking a PI, your local 
FSDO.
    (3) An AMOC that provides an acceptable level of safety may be 
used for any repair required by this AD, if it is approved by an 
Authorized Representative for the Boeing Commercial Airplanes 
Delegation Option Authorization Organization who has been authorized 
by the Manager, Seattle ACO, to make those findings. For a repair 
method to be approved, the repair must meet the certification basis 
of the airplane, and the approval must specifically refer to this 
AD.
    (4) Installation of metallic window blanks at cockpit eyebrow 
windows No. 4 and No. 5 in accordance with Supplemental Type 
Certificate ST01704SE is approved as an alternative means of 
compliance with the initial and repetitive inspections for the 
flight deck No. 4 and No. 5 windows required by paragraph (f) of 
this AD. All other applicable actions required by paragraph (f) of 
this AD must be fully complied with.

    Issued in Renton, Washington, on November 7, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E7-23342 Filed 11-30-07; 8:45 am]
BILLING CODE 4910-13-P