Wed, Apr 23, 2008
AD NUMBER: 2008-08-25
SUBJECT: Airworthiness Directive 2008-08-25
SUMMARY: We are adopting a new airworthiness directive
(AD) for certain Boeing Model 747-400F and -400 series
This AD requires installing drains and drain tubes to eliminate
water accumulation in the drip shield above the M826 Card File in
the main equipment center.
This AD results from a report that water from the drip shield
entered the card file and damaged a circuit card, causing the AFT
CARGO FIRE MSG message to be illuminated and resulting in an air
We are issuing this AD to prevent water from entering the card
file and damaging a circuit card. Failure of one or more of the 15
fuel system circuit cards in the card file could cause loss of fuel
management, which could cause unavailability of fuel.
Failure of one or more of the 35 fire detection circuit cards
could cause a false message of a fire, or no message of a fire when
there is a fire.
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