Airworthiness directives › 2020-11-11
AD 2020-11-11 Airworthiness Directives; The Boeing Company Airplanes
Models named: 777-200, -200LR, -300, -300ER, 777F series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
The FAA is issuing this AD to address discrepancies in the CWT fuel quantity indicating system (FQIS) fuel quantity and the refueling truck uploaded fuel amount, which could result in an airplane dispatched with insufficient fuel loaded in the CWT and with the flight crew unaware of the insufficient fuel prior to departure. This condition, coupled with continued flight to the destination airport after receiving engine-indicating and crew-alerting system (EICAS) messages while en route to the destination, could result in fuel exhaustion and subsequent power loss of all engines. Thereby, resulting in the inability to land at the destination airport or at a diversion airport, possibly leading to uncontrolled flight into terrain.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1