Airworthiness directives › 2016-04-20
AD 2016-04-20 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-600, -700, -700C, -800, -900, -900ER series, 757-200, -200PF, -200CB, -300 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company airplanes identified in paragraphs (c)(1) through (c)(4) of this AD, certificated in any category. (1) Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. (2) Model 757-200, -200PF, -200CB, and -300 series airplanes. (3) Model 767-200, -300, -300F, and -400ER series airplanes. (4) Model 777-200, -200LR, -300, -300ER, and -777F series airplanes.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For Model 767-300 series airplanes having line numbers 939 and 940; and Model 777-200, -200LR, -300, -300ER, and -777F series airplanes, except airplanes having line numbers 454 through 551 inclusive, and 563 and subsequent: Within 60 months after the effective date of this AD, do an inspection to determine whether any motor-operated shutoff valve (MOV) actuators having P/N MA20A1001-1 (S343T003-39) for the fuel tanks or fuel feed system are installed on the airplane. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number of the actuator at each location can be conclusively determined from that review. (1) For Model 767 airplanes, there are several affected actuator locations: the fuel shutoff valves, the fuel crossfeed valves, the defueling valves, the jettison nozzle valves, the jettison transfer valves, the auxiliary power unit (APU) fuel shutoff valve and the APU fuel isolation valve. (2) For Model 777 airplanes, there are several affected actuator locations: the fuel shutoff valves, the fuel crossfeed valves, the defueling valves, the jettison nozzle valves, the jettison isolation valves, the APU fuel shutoff valve, the APU fuel isolation valve, the auxiliary tank isolation valve, the auxiliary tank refuel valve, the auxiliary tank fuel transfer valve, the auxiliary tank vent valve, and the auxiliary tank Number 2 refuel isolation valve.
Unsafe condition
This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent electrical energy from lightning, hot shorts, or fault current from entering the fuel tank through the fuel valve actuator shaft, which could result in fuel tank explosions and consequent loss of the airplane.
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