2002-24-51 BOEING: Docket No. 2002-NM-309-AD.
Applicability: All Boeing Model 737-600, -700, -700C, -800, and -900 series airplanes.
To require the flightcrew to maintain certain minimum fuel levels in the center fuel tanks, accomplish the following:
Airplane Flight Manual (AFM) Revision: Model 737-600, -700, -700C, -800, and -900
(b) For Model 737-600, -700, -700C, -800, and -900 series airplanes: Within 4 days after receipt of this AD, revise the Limitations Section of the AFM to include the following (this may be accomplished by inserting a copy of this AD into the AFM):
"CERTIFICATE LIMITATIONS
The center tank fuel pumps must be OFF for takeoff if center tank fuel is less than 5,000 pounds (2,300 kilograms) with the airplane readied for initial taxi.
Both center tank fuel pump switches must be selected OFF when center tank fuel quantity reaches approximately 1,000 pounds (500 kilograms) during climb and cruise or 3,000 pounds (1,400 kilograms) during descent and landing. The fuel pumps must be positioned OFF at the first indication of fuel pump low pressure.
The CWT fuel quantity indication system must be operative to dispatch with CWT mission fuel.
Note
The CONFIG indicator will annunciate when center tank fuel exceeds 1,600 pounds (800 kilograms) and the center tank fuel pump switches are OFF. Do not accomplish the CONFIG non-normal procedure prior to or during takeoff with less than 5,000 pounds (2,300 kilograms) of center tank fuel or during descent and landing with less than 3,000 pounds (1,400 kilograms) of center tank fuel.
edit:
even wat extra info
The FAA has received reports indicating that two fuel tank pumps from different Model 747 series airplanes showed evidence of extreme localized overheating of parts in the priming and vapor pump section of the fuel pump. The priming and vapor pump section of the pump is open to the fuel tank via the pump inlet line and the vapor vent of the pump. The cause of this overheating is believed to be friction between the pump parts; however, the specific cause of the friction is unknown at this time.
Such overheating of the parts in the priming and vapor pump section of the fuel pump provides an ignition source in the fuel tank during dry running of the pump, which could result in fire/explosion of the fuel tank.
Similar Parts
The pumps involved in the two reports described previously have the same part numbers as those that were addressed in AD 2002-19-52. The fuel pumps installed on Model 737-600, -700, -700C, -800, and -900; Model 747; and Model 757 series airplanes are all potentially affected since the pumps are almost identical in design.
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Voor 24% gewijzigd door
rdluca op 31-12-2003 15:53
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