MANUFACTURER: The Boeing Company Model 737-600,
-700, -700C, -800, and -900 Series Airplanes SUBJECT: Airworthiness Directive 2011-18-03 ACTION: Final rule
SUMMARY: This AD requires installation of an
automatic shutoff system for the center tank fuel boost pumps, and
installation of a placard in the airplane flight deck if necessary.
This AD also requires revisions to the Limitations and Normal
Procedures sections of the airplane flight manual to advise the
flightcrew of certain operating restrictions for airplanes equipped
with an automated center tank fuel pump shutoff control. This AD
further requires installation of a secondary control relay for the
electrical control circuit of each of the two center tank fuel
boost pumps. Additionally, this AD requires a revision to the
maintenance program to incorporate Airworthiness Limitation (AWL)
No. 28-AWL-23. This AD also provides an option of installation and
maintenance of universal fault interrupters using a certain
supplemental type certificate, which terminates certain
requirements of this AD. This AD was prompted by fuel system
reviews conducted by the manufacturer. The FAA is issuing this AD
to prevent center tank fuel pump operation with continuous low
pressure, which could lead to friction sparks or overheating in the
fuel pump inlet that could create a potential ignition source
inside the center fuel tank. These conditions, in combination with
flammable fuel vapors, could result in a center fuel tank explosion
and consequent loss of the airplane.
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