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The docket contains more detailed info, such as:
Discussion
We have received a report of in-service occurrences of loss of fuel
system suction feed capability, followed by total loss of pressure of
the fuel feed system. This condition, if not corrected, could result in
dual engine flameout, inability to restart the engines, and consequent
forced landing of the airplane.
FAA's Conclusions
We have determined that it is necessary to require an operational
test of the engine fuel suction feed of the fuel system, and other
related testing, as applicable. Procedures for doing the operational
test can be found in the maintenance manual. The other related testing
is for airplanes on which one or both of the engines stop idling in
less than five minutes after starting the test. Failure of the engine
fuel suction feed of the fuel system could result in the unsafe
condition described previously.
...
Applicability
(c) This AD applies to all Boeing Model 777-200, -200LR, -300,
and -300ER series airplanes, certificated in any category.
Unsafe Condition
(d) This AD results from a report of in-service occurrences of
loss of fuel system suction feed capability, followed by total loss
of pressure of the fuel feed system. We are issuing this AD to
detect and correct failure of the engine fuel suction feed of the
fuel system, which could result in dual engine flameout, inability
to restart the engines, and consequent forced landing of the
airplane.
...
Operational Test/Other Related Testing
(f) Within 7,500 flight hours after the effective date of this
AD, perform an operational test of the engine fuel suction feed of
the fuel system, and perform all other related testing, as
applicable, before further flight, according to a method approved by
the Manager, Seattle Aircraft Certification Office (ACO), FAA. One
approved method is the operational test in Section 28-22-00, titled
``Engine Fuel Feed--General Description,'' of the Boeing 777
Aircraft Maintenance Manual; and Boeing 777 Task Card 28-020-02-01,
titled ``Fuel Feed Manifold,'' dated May 5, 2007. Repeat the
operational test thereafter at intervals not to exceed 7,500 flight
hours.
http://edocket.access.gpo.gov/2008/E8-12691.htm