Transport Airplane Directorate 1601 Lind Avenue, S.W. Renton, W ashington 98057
- 3356

August 5, 2011 Exemption No. 10267A Regulatory

Docket No. FAA

- 2010

- 1268 Ms. Christine M. Thompson Lead Program Administrator, Development Projects The Boeing Compan y PO Box 3707 MC 03

- 56 Seattle, WA 98124

- 2207 Dear Ms. Thompson: This letter is to inform you that we have granted your petition for amendment to Exemption No. 10267. It explains th e basis for our decision and describes its effect. **The Basis for Our Decision** By letter dated July

15, 2011, y ou petitioned the Federal Aviation Administration (FAA) on behalf of The Boeing Company for an amendment to Exemption No. 10267. That exemption from § § 25.1305(c)(6) and 25.1309(c), Amendment 25

- 120, of Title 14, Code of Federal Regulations, provides The Boeing Company temporary

relief from the cockpit indication requirements for indicating fuel s ys tem contamination on Boeing Model 747

- 8 and 747

- 8F airplanes. The amendments you request would improve the inspection procedures required as a condition of the exemption so one engine is inspected at a specified time rather than inspecting multiple engine s at the same time. This is needed to reduce th e likelihood of a maintenance error causing multiple engine failure. It is our understanding that there has been no change in the intent of the conditions and reasons relative to public interest and safet y that were the basis for granting the original exemption. The FAA has determined that good cause exists for not publishing a summary of the petition in the Federal Register because the requested amendment to the exemption would not set a precedent, and any delay in acting on this petition would be detrimental to The Boeing Compan y. **Our Decision** The FAA has determined that the justification for the issuance of Exemption No. 10267, remains valid with respect to this amendment and is in the public interest. Therefore,under the authorit y provided by 49 U.S.C. 40113 and 44701, which the FAA

Administrator has delegated to me, Igrant your petition for amendment to Exemption No. 10267. **The Effect of Our Decision** Our decision amends Exemption No. 10267 to clarify the procedures of provision number 1. That provision requires the Airworthiness L imitations section of the Instructions for Continued Airworthiness to include procedures for inspecting the engine fuel strainer located upstream of the engine driven pump for contaminants after the first flight follo wing maintenance actions where personnel enter into the center wing fuel tank. The amended provisions require inspection of the engine fuel strainer maintenance indicators after the first flight, and inspection of engines at specified flight hours interva ls instead of after a single flight. The amended provision number 1 is as follows: 1. For Model 747

- 8/

- 8F airplanes granted a certificate of airworthiness before June 30, 2014, the Airworthiness Limitations section of the Instructions for Continued A irworthiness must include a limitation that requires operators to verify that contaminants have not accumulated on the fuel strainer located upstream of the engine driven fuel pump. The limitation must also require an ins pection of the fuel cooled oil coo ler if the fuel strainer has by passed fuel. The airworthiness limitation must require these actions following any maintenance action that resulted in personnel entry into the center wing fuel tank: a. After the first flight following tank entry , access and anal yz e the messages from the engine indication and crew alerting s ys tem an d central maintenance computer to detect an y b yp ass or impending b yp ass of an y of the engine fuel strainers. b. Perform a ph ys ical inspection of the engine fuel strai ner from one engine within 20 flight hours.

c. Perform a second ph ysical inspection of the engine fuel strainer from a second engine within 40 flight hours

. All other conditions and limitations of Exemption No. 10267 remain the same. This letter must be attached to, and is a part of, Exemption No. 10267. Sincerel y, Original signed by Ali Bahrami

Ali Bahrami Manager, Transport Airplane Directorate Aircraft Certification Service