## 6208 Federal Register / Vol. 78, No. 20 / Wednesday, January 30, 2013 / Rules and Regulations

RB211–Trent 972–84, RB211–Trent 972B–84, RB211–Trent 977–84, RB211–Trent 977B–84, and RB211–Trent 980–84 engines, all serial numbers.
(d) Reason

This AD was prompted by a Trent 900 engine experiencing low-pressure turbine (LPT) stage 2 disk interstage seal material loss and increased low-pressure rotor vibration while in flight. We are issuing this AD to prevent cracks in the LPT disk, which could result in uncontained engine failure and damage to the airplane.
(e) Actions and Compliance

Unless already done, do the following. (1) After every flight after the effective date of this AD, review the Engine Health Monitoring (EHM) low-pressure rotor (N1) vibration data. If you find that the maximum and average vibrations exceed 0.7 inches/sec (ips) and 0.5 ips, respectively, then within 10 engine flight cycles, confirm that the vibration data was not the result of indicator

error.

(2) If you cannot show that the vibration increase was caused by indicator error, inspect the LPT disk seal fins and interstage seals. Use RR Repeater Technical Variance 125060, Issue 1, dated July 27, 2012, to do the inspections.

(3) After the effective date of this AD, at each engine shop visit inspect the LPT disk seal fins and interstage seals. Use RR Alert Non-Modification Service Bulletin RB.211– 72–AH054, Revision 1, dated November 5, 2012, or Initial Issue, dated September 14, 2012, to do the inspections.

(4) If, during the inspection required by paragraphs (e)(2) or (e)(3) of this AD, you find any cracks in the disk seal fins or that the interstage seals are missing seal material, replace the parts with hardware eligible for installation before returning the engine to service.
(f) Definitions

For the purposes of this AD, a shop visit is defined as whenever engine maintenance performed prior to reinstallation requires one of the following:

(1) Separation of a pair of major mating engine module flanges. However, separation of flanges solely for the purpose of shipment without subsequent internal maintenance is not a shop visit. Separation of the external gearbox engine mating flanges or removal of the external gearbox is also not classified as a shop visit.

(2) Removal of a disk, hub, or spool. (g) Credit for Previous Actions

If you took corrective action before the effective date of this AD in accordance with RR Repeater Technical Variance 125658, Issue 2, dated August 14, 2012, for detected excessive vibration, you met the inspection requirements of this AD. (h) Alternative Methods of Compliance (AMOCs)

The Manager, Engine Certification Office, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. (i) Related Information (1) For more information about this AD, contact Robert Green, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781–238–7754; fax: 781–238–7199; email: robert.green@faa.gov.

(2) Refer to MCAI European Aviation Safety Agency AD 2012–0220, dated October 22, 2012. (j) Material Incorporated by Reference

(1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise.

(i) Rolls-Royce plc (RR) Non-Modification Service Bulletin (NMSB) RB.211–72–AH054, Initial Issue, dated September 14, 2012.

(ii) RR NMSB RB.211–72–AH054, Revision 1, dated November 5, 2012.

(iii) RR Repeater Technical Variance 125060, Issue 1, dated July 27, 2012.

(3) For service information identified in this AD, contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, England, DE248BJ; phone: 011–44–1332– 242424; fax: 011–44–1332–245418, or email: http://www.rolls-royce.com/contact/ civil

_team.jsp. (4) You may view this service information at FAA, 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.

(5) You may view this service information 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/ibrlocations.html.

Issued in Burlington, Massachusetts, on January 15, 2013. Thomas A. Boudreau, Acting Manager, Engine & Propeller Directorate, Aircraft Certification Service.
[FR Doc. 2013–01361 Filed 1–29–13; 8:45 am]

**BILLING CODE 4910–13–P**



### DEPARTMENT OF DEFENSE

**Office of the Secretary**

**32 CFR Part 68**

**[Docket No. DOD–2009–OS–0034]**

**RIN 0790–AI50**



### Voluntary Education Programs

**AGENCY** 

### : Office of the Under Secretary of Defense for Personnel and Readiness, DoD.

**ACTION** 

### : Final rule; notice of stay.

**SUMMARY** 

### : On Friday, December 7, 2012 (77 FR 72941–72956), the Department of Defense published a final rule in the Federal Register titled Voluntary Education Programs. Subsequent to the publication of that rule, the Department discovered that the effective date in the
**DATES** 

### section was calculated incorrectly. The DoD is taking action to stay the rule to the appropriate effective date.

**DATES** 

### : Effective January 30, 2013, 32 CFR part 68 is stayed until February 5,
2013.

**FOR FURTHER INFORMATION CONTACT**

### : Patricia Toppings, 571–372–0485.

Dated: January 25, 2013. Aaron Siegel, Alternate OSD Federal Register Liaison Officer, Department of Defense.
[FR Doc. 2013–01988 Filed 1–29–13; 8:45 am]

**BILLING CODE 5001–06–P**



### DEPARTMENT OF HOMELAND **SECURITY**

**Coast Guard**

**33 CFR Part 117**

**[USCG–2013–0031]**


### Drawbridge Operating Regulations; **Gulf Intracoastal Waterway, Belle Chasse, LA** 

**AGENCY** 

### : Coast Guard, DHS.

**ACTION** 

### : Notice of deviation from drawbridge regulation.

**SUMMARY** 

### : The Coast Guard has issued a temporary deviation from the operating schedule that governs the Louisiana State Route 23 (LA 23) vertical lift span bridge, also known as the Judge Perez Bridge, across the Gulf Intracoastal Waterway (Algiers Alternate Route), mile 3.8, at Belle Chasse, Plaquemines Parish, Louisiana. This deviation is necessary to repair bridge machinery and to replace the wire ropes of the bridge. This deviation allows the bridge to remain closed to navigation for eight consecutive days in order to perform scheduled maintenance.

**DATES** 

### : This deviation is effective from 6 a.m. on Sunday, February 24, 2013, until 6 a.m. on Monday, March 4, 2013.

**ADDRESSES** 

### : The docket for this notice, docket number USCG–2013–0031, is available online. To view it, go to http:// www.regulations.gov, type the docket number in the ‘‘SEARCH’’ box and click ‘‘SEARCH.’’ Click on Open Docket Folder on the line associated with this notice of deviation. You may also visit the Docket Management Facility in Room W12–140 on the ground floor of