AD 2015-23-04

We are adopting a new airworthiness directive (AD) for all General Electric Company (GE) GEnx-1B turbofan engine models. This AD was prompted by reports of GEnx-1B engine oil loss. This AD requires removal and replacement of the non-conforming ball valve in the oil filler cap. We are issuing this AD to prevent loss of engine oil, which could lead to failure of one or more engines, loss of thrust control, and damage to the airplane.

Final rule.

Adoption of the Amendment

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

PART 39--AIRWORTHINESS DIRECTIVES

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

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

Sec. 39.13 [Amended]

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

2015-23-04 General Electric Company: Amendment 39-18320; Docket No. FAA-2015-1658; Directorate Identifier 2015-NE-18-AD.

(a) Effective Date

This AD is effective December 17, 2015.

(b) Affected ADs

None.

(c) Applicability

This AD applies to all General Electric Company (GE) GEnx-1B model turbofan engines with oil filler cap, part number (P/N) 2349M62G01, installed, that do not contain any of the following markings after the P/N on the oil filler cap scupper: ``P/M BALL PP,'' or ``RW,'' or ``79-0022.''

(d) Unsafe Condition

This AD was prompted by reports of GEnx-1B engine oil loss. We are issuing this AD to prevent loss of engine oil, which could lead to failure of one or more engines, loss of thrust control, and damage to the airplane.

(e) Compliance

Comply with this AD within the compliance times specified, unless already done.
(1) Within 360 cycles in service after the effective date of this AD, remove the ball valve, P/N 2349M68P01, from the affected oil filler cap and replace with a part eligible for installation.
(2) Reserved.

(f) Alternative Methods of Compliance (AMOCs)

The Manager, Engine Certification Office, FAA, may approve AMOCs to this AD. Use the procedures found in 14 CFR 39.19 to make your request. You may email your request to: ANE-AD-AMOC@faa.gov.

(g) Related Information

(1) For more information about this AD, contact Christopher McGuire, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New EnglandExecutive Park, Burlington, MA 01803; phone: 781-238-7120; fax: 781-238-7199; email: chris.mcguire@faa.gov.
(2) GE GEnx-1B SB No. 79-0022, Revision 1, dated May 13, 2015, which is not incorporated by reference in this AD, can be obtained from GE using the contact information in paragraph (g)(3) of this AD.
(3) For service information identified in this AD, contact General Electric Company, GE Aviation, Room 285, 1 Neumann Way, Cincinnati, OH 45215; phone: 513-552-3272; email: geae.aoc@ge.com.
(4) You may view this service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability of this material at the FAA, call 781-238-7125.

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all GE GEnx-1B turbofan engine models. The NPRM published in the Federal Register on June 17, 2015 (80 FR 34560). The NPRM was prompted by multiple reports of engine oil loss and resultant flight plan diversions. The NPRM proposed to require removal and replacement of the non-conforming ball valve in the oil filler cap. We are issuing this AD to correct the unsafe condition on these products.

Comments

We gave the public the opportunity to participate in developing this AD. The following presents the comments received on the NPRM (80 FR 34560, June 17, 2015) and the FAA's response to each comment.

Support for the NPRM

One individual commenter expressed support for the NPRM (80 FR 34560, June 17, 2015).

Request To Change Applicability

American Airlines (American) requested that paragraph (c) Applicability be changed. American stated that the part number and the post-SB markings are located on the oil filler cap scupper not on the oil filler cap itself. American indicated that this change would improve clarity and accomplishment of the AD.

[[Page 69839]]

We agree. We revised paragraph (c), Applicability, of this AD to read: ``This AD applies to all General Electric Company (GE) GEnx-1B model turbofan engines with oil filler cap, part number (P/N) 2349M62G01, installed, that do not contain any of the following markings after the P/N on the oil filler cap scupper: ``P/M BALL PP,'' or ``RW,'' or ``79-0022.''

Conclusion

We reviewed the relevant data, considered the comment received, and determined that air safety and the public interest require adopting this AD with the change described previously. We determined that this change will not increase the economic burden on any operator or increase the scope of this AD.

Related Service Information

We reviewed GE GEnx-1B Service Bulletin (SB) No. 79-0022, Revision 1, dated May 13, 2015. The SB describes procedures for removing and replacing the ball valve in the oil filler cap.

Costs of Compliance

We estimate that this AD affects 86 engines installed on airplanes of U.S. registry. We also estimate that it will take about 1 hour per engine to comply with this AD. The average labor rate is $85 per hour. Required parts cost about $11 per engine. Based on these figures, we estimate the cost of the AD to U.S. operators to be $8,256.

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.'' Underthat 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

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),
(3) Will not affect intrastate aviation in Alaska, and
(4) 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.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.