AD NUMBER: 2008-12-09
SUBJECT: Airworthiness Directive 2008-12-09 SUMMARY: We are adopting a
new airworthiness directive (AD) for the products listed above.
This AD results from mandatory continuing airworthiness information
(MCAI) originated by an aviation authority of another country to
identify and correct an unsafe condition on an aviation product.
The MCAI describes the unsafe condition as: The assessment and
lightning tests showed that certain fuel tube self-bonded couplings
do not provide sufficient lightning current capability. The
assessment also showed that single failure of the integral bonding
wire of the self-bonded couplings could affect electrical bonding
between the tubes. Insufficient electrical bonding between fuel
tubes or insufficient current capability of fuel tube couplings, if
not corrected, could result in arcing and potential ignition
source[s] inside the fuel tank during lightning strikes and
consequent fuel tank explosion.