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AD 2008-04-12

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Airworthiness directive · Left and right transformer rectifier units (TRUs) · Boeing 767-200 Series, 767-300 Series, 767-300F Series and 1 more

Open in Federal RegisterOpen in FAA DRSDocket on regulations.gov

Official PDF· 2 pages, 148 KB
Download from govinfo.gov
AboutSource files 4
Effective
April 3, 2008
Published
February 28, 2008 · 73 FR 10645–10646
Issued
February 13, 2008
Supersedes
AD2004-23-14
Models
767-200 Series, 767-300 Series, 767-300F Series, 767-400ER Series
Data sheet
TCDSA1NM
Registered aircraft
439 matched by model
Product
Aircraft · Large airplane
Amendment
39-15384
Docket
FAA-2007-0203
Project
2007-NM-105-AD
Issued as
Final rule

Unofficial copy from the Federal Register XML, document E8-3394. Only the govinfo PDF is the legal edition. DRS record last changed May 30, 2024.

On this page

Summary

The FAA is superseding an existing airworthiness directive (AD), which applies to certain Boeing Model 767-200, -300, and -300F series airplanes. That AD currently requires reworking the surface of the ground stud bracket of the left and right transformer rectifier units (TRUs) and the airplane structure mounting surface, and measuring the resistance from the bracket to the structure and the ground lugs to the bracket using a bonding meter. This new AD revises the applicability of the existing AD to include additional airplanes and requires, among other actions, installation of a new ground stud bracket using faying surface bonding. This AD results from a report of loss of all direct current (DC) power generation during a flight, due to inadequate electrical ground path between the ground bracket of the TRUs/main battery charger (MBC) and the structure. We are issuing this AD to prevent depletion of the main battery while in flight, resulting from the loss of both TRUs and the MBC, and consequent loss of all DC power, which could impact the safe flight and landing of the airplane due to the loss of function or malfunction of essential/critical systems and displays in the cockpit.

The airworthiness directive

2008-04-12 Boeing: Amendment 39-15384. Docket No. FAA-2007-0203; Directorate Identifier 2007-NM-105-AD.

(a) Effective Date

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(a) This AD becomes effective April 3, 2008.

(b) Affected ADs

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(b) This AD supersedes AD 2004-23-14.

(c) Applicability

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(c) This AD applies to Boeing Model 767-200, -300, -300F, and -400ER series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 767-24A0162, dated May 30, 2006.

(d) Unsafe Condition

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(d) This AD results from a report of loss of all direct current (DC) power generation during a flight, due to inadequate electrical ground path between the ground bracket of the left and right transformer rectifier unit (TRUs)/main battery charger (MBC) and the structure. We are issuing this AD to prevent depletion of the main battery while in flight, resulting from the loss of both TRUs and the MBC, and consequent loss of all DC power, which could impact the safe flight and landing of the airplane due to the loss of function or malfunction of essential/critical systems and displays in the cockpit.

(e) Compliance

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(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.

(f) Rework and Measure Resistance

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(f) For Model 767-200, -300, and -300F series airplanes, as listed in Boeing Alert Service Bulletin 767-24A0119, Revision 2, dated August 19, 2004; on which the actions of Boeing Service Bulletin 767-24-0119, dated May 14, 1998, and/or Revision 1, dated December 16, 1999, have been done: Within 45 days after December 1, 2004 (the effective date of AD 2004-23-14), rework the ground stud bracket of the TRUs and structure mounting surface, and measure the resistance from the bracket to the structure and the grounding lug to the bracket using a bonding meter, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 767-24A0119, Revision 2, dated August 19, 2004, as revised by Boeing Information Notice 767-24A0119 IN 01, dated October 21, 2004, except as provided by paragraph (g) of this AD.

(g) Step 4, Sheet 3 of Figure 1 in the Accomplishment Instructions of the service bulletin only specifies to install one collar with part number (P/N) BACC30M6. However, a collar with P/N BACC30BL6 (as listed in paragraph 2.C., “Parts Necessary For Each Airplane” of the service bulletin) may be used as an alternative method of compliance (AMOC).

(h) Rework, Installation, Measurement, as Applicable

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(h) For all airplanes: Within 36 months after the effective date of this AD, rework the existing ground stud bracket of the TRUs/MBC, measure the resistance, and install a new ground stud bracket of the TRUs by doing all the applicable actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 767-24A0162, dated May 30, 2006.

(i) AMOCs

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(i)(1) The Manager, Seattle Aircraft Certification Office, 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.

(j) Material Incorporated by Reference

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(j) You must use Boeing Alert Service Bulletin 767-24A0119, Revision 2, dated August 19, 2004, as revised by Boeing Information Notice 767-24A0119 IN 01, dated October 21, 2004; and Boeing Alert Service Bulletin 767-24A0162, dated May 30, 2006, to perform the actions that are required by this AD, unless the AD specifies otherwise.

(1) The Director of the Federal Register approved the incorporation by reference of Boeing Alert Service Bulletin 767-24A0162, dated May 30, 2006, in accordance with 5 U.S.C. 552(a) and 1 CFR part 51.

(2) On December 1, 2004 (69 FR 67043, November 16, 2004), the Director of the Federal Register approved the incorporation by reference of Boeing Alert Service Bulletin 767-24A0119, Revision 2, dated August 19, 2004, as revised by Boeing Information Notice 767-24A0119 IN 01, dated October 21, 2004.

(3) Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207, for a copy of this service information. You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

Rule preamble

The FAA’s background, reasoning and cost estimate, published with the AD.

DatesPage 1

This AD becomes effective April 3, 2008.

The Director of the Federal Register approved the incorporation by reference of a certain publication listed in the AD as of April 3, 2008.

On December 1, 2004 (69 FR 67043, November 16, 2004), the Director of the Federal Register approved the incorporation by reference of Boeing Alert Service Bulletin 767-24A0119, Revision 2, dated August 19, 2004, as revised by Boeing Information Notice 767-24A0119 IN 01, dated October 21, 2004.

AddressesPage 1

For service information identified in this AD, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207.

For further information contactPage 1

Louis Natsiopoulous, Aerospace Engineer, Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 917-6478; fax (425) 917-6590.

DiscussionPage 1

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an AD that supersedes AD 2004-23-14, amendment 39-13869 (69 FR 67043, November 16, 2004). The existing AD applies to certain Boeing Model 767-200, -300, and -300F series airplanes. That NPRM was published in the Federal Register on November 19, 2007 (72 FR 64964). That NPRM proposed to require reworking the surface of the ground stud bracket of the left and right transformer rectifier units (TRUs) and the airplane structure mounting surface, and measuring the resistance from the bracket to the structure and the ground lugs to the bracket using a bonding meter. That NPRM also proposed revising the applicability of the existing AD to include additional airplanes and to require, among other actions, installation of a new ground stud bracket using faying surface bonding.

CommentsPage 1

We provided the public the opportunity to participate in the development of this AD. We considered the comment that has been received on the NPRM. Boeing, the single commenter, supports the NPRM.

ConclusionPage 1

We have carefully reviewed the available data, including the comment that has been received, and determined that air safety and the public interest require adopting the AD as proposed.

Costs of CompliancePage 1

There are 932 airplanes of the affected design in the worldwide fleet. The following table provides the estimated costs for U.S. operators to comply with this AD.

Estimated Costs
ActionWork hoursAverage labor rate per hourPartsCost per airplaneNumber of U.S.-registered airplanesFleet cost
Rework and Measurement (required by AD 2004-23-14)1$80$4$84262$22,008.
New actions1 or 2 180208$288 or $368 1412$118,656 or $151,616. 1
Authority for This RulemakingPage 1

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 findingsPage 2

We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will 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 this AD:

(1) Is not a “significant regulatory action” under Executive Order 12866;

(2) Is not a “significant rule” under 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 AD and placed it in the AD docket. See the ADDRESSES section for a location to examine the regulatory evaluation.

Adoption of the amendmentPage 2

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

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

2. The Federal Aviation Administration (FAA) amends § 39.13 by removing amendment 39-13869 (69 FR 67043, November 16, 2004) and by adding the following new airworthiness directive (AD):

Affected TCDS · 1

The type certificate data sheets for the models this AD names, matched by model and maker.

TCDS A1NMThe Boeing CompanyNames 4 of 5 models: 767-300 Series, 767-200 Series, 767-400ER Series and 767-300F Series

Registered aircraft · 439

Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.

By aircraft maker
  • Boeing439
By year built
19822026

39 with no year recorded

By model

See all 37 models

Aircraft

N102DADelta Air Lines Inc · Atlanta, GABuilt 1982 · S/N 22214N105FEFederal Express Corp · Memphis, TNBuilt 2019 · S/N 64055N111FEFederal Express Corp · Memphis, TNBuilt 2020 · S/N 64060
See all 439 aircraft