( ^ Ronald J. Hinderberger 

Lead Administrator 

Regulatory Administration 

Commercial Airplanes 

The Boeing Company 

P.O. Box 3707 MC 03-56 

Seattle, WA 98124-2207 

yTJjW 

.W\ 

RA-ll-03715 

U.S. Department of Transportation 

Docket Management System 

1200 New Jersey Avenue, SE 

West Building Ground Floor, Room W12-140 

Washington, D.C. 20590 

Subject: Request for Amendment to FAA Exemption No. 10267 

Provision No. 1 

Model: 747-8F, 747-8 

Reference: PAA Exemption No. 10267 (Regulatory Docket No. 

FAA-2010-1268), issued on May 19,2011. 

y ^ 

The Boeing Company respectfully requests an amendment to provision #1 of the 

reference exemption. The FAA decision included the following provision in 

granting the exemption: 

''''For Model 747-8/8F airplanes granted a certificate of airworthiness before 

June 30, 2014, the Airworthiness Limitations section of the Instructions for 

Continued Airworthiness must include a limitation that requires operators to 

verify contaminants have not accumulated on the fuel strainer located upstream 

of the engine driven fuel pump. The procedures must be accomplished after the 

first flisht following anv maintenance actions that result in personnel entry into 

the center wins fuel tank and before the next flisht. The limitation must also 

require an inspection of the fuel cooled oil cooler if the fuel strainer has 

bypassed fuel r 

The current provision only allows for one flight cycle before all engines are 

required to be inspected before the next flight. The amendment to this provision 

is requested to allow for flight hours, instead of flight cycles, to be used for the 

physical inspection interval of the fuel strainer and to limit the physical 

inspections to two engines. This amended provision would be met by three 

separate inspections: 

• Inspection of the Engine Indication and Crew Alerting System (EICAS) 

and Central Maintenance Computer (CMC) messages to detect any 

bypass or impending bypass at the fuel strainers after the first flight; 

• Physical inspection of the engine fiiel strainer after 20 flight hours for 

the first engine; 
^ . 

Page 2 

Mr. Breneman 

RA-ll-03715 

• Physical inspection of the engine fuel strainer after 40 hours for the 

second engine. 

The two engines selected will be those determined by analysis to be fed primarily 

from the center fuel tank. No inspection would be required for the other two 

engines. 

The rationale for requesting this amendment is to ensure that the engines are 

operated on center tank fuel for sufficient time for any maintenance related 

contaminants to be captured by the engine fuel strainers, while allowing 

adherence to the best practices of avoiding common multiple engine 

maintenance. The two engine sampling is an effective common mode threat 

mitigation strategy. Additionally, Boeing is committing to similar inspections 

following inboard main fuel tank entry by maintenance personnel. 

Very truly yours. 

Cbnstine M. Thompson 

Lead Program Administrator, Development Projects 

(425) 266-6572, MC 03-56 

FAX: (425)294-9340 

cc 

Name 

Ali Bahrami 

Gary Oltman 

Sue Lucier 

Jon Regimbal 

Henry Wildegans 

Henk Pruis 

Letter 

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Enclosures 

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Comments 

ANM-IOOS 

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