Airworthiness Directive · Amendment 39-19915 · Fuel
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category, equipped with a Center Wing Tank (CWT) having a capacity of 26,100 U.S. gallons or greater.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD requires a repetitive check of the fuel quantity indicating system (FQIS) fuel quantity calculation for the center wing tank (CWT) fuel quantity, developing a process to provide documentation to the flight crew that this check was done, and revising the existing airplane flight manual (AFM) to incorporate verification procedures and flight crew awareness. This AD was prompted by reports of discrepancies between the FQIS fuel quantity and the refueling truck uploaded fuel amount, followed by certain engine-indicating and crew-alerting system (EICAS) messages. The FAA is issuing this AD to address the unsafe condition on these products.
Within 30 days after the effective date of this AD: Check the fuel quantity of the CWT by doing the “Refueling Station Door Cycling Procedure” as specified in paragraphs (g)(1) through (6) of this AD. Thereafter, check the fuel quantity of the CWT as specified in paragraphs (g)(1) through (6) of this AD before further flight after any center tank fueling (adding or removing fuel).
(1) Get access to the refueling station door and integrated refuel panel on the left wing.
(2) Close and latch the refueling station door on the left wing for a minimum of five (5) seconds. If installed, make sure the right wing refueling station door is closed.
(3) Re-open the refueling station door and wait for the fuel quantity display to reset.
(4) Make sure that the center or total fuel tank quantities still remain within fuel load sheet requirements. If the fuel quantity is incorrect then accomplish actions specified in paragraphs (g)(4)(i) and (ii) of this AD.
(i) Adjust fuel loading as applicable for fuel upload parameters. Refer to operator's refuel procedures for adjusting the fuel load.
(ii) Repeat the “Refueling Station Door Cycling Procedure,” starting at paragraph (g)(2) of this AD.
(5) Close the refueling station door.
(6) Notify the operator after the “Refueling Station Door Cycling Procedure” has been done, and correct fuel load verified.
Within 30 days after the effective date of this AD, submit a process to the FAA (Flight Standards) for approval that describes at the end of the fueling process and before each flight how documentation is provided to the flight crew that the CWT fuel quantity check using the “Refueling Station Door Cycling Procedure” specified in paragraph (g) of this AD was done.
(1) Within 30 days after the effective date of this AD: Revise the “Certificate Limitations: Fuel Quantity Indication System (FQIS)” section of the operator's existing AFM by incorporating the information specified in figure 1 to paragraph (i)(1) of this AD.
(2) Within 30 days after the effective date of this AD: Revise the “Normal Procedures: Fuel Quantity Indication System (FQIS)—Refueling Station Door Cycling Procedure” section of the operator's existing AFM by incorporating the information specified in figure 2 to paragraph (i)(2) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
