Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. This proposed 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:
[T]he FAA has published SFAR 88 (Special Federal Aviation Regulation 88). * * *
Under this regulation, all holders of type certificates for passenger transport aeroplanes * * * are required to conduct a design review against explosion risks. The replacement of some types of P-clips and improvement of the electrical bonding of the equipment in the fuel tanks [were] are rendered mandatory * * *.
* * * * *
Subsequently, an internal review * * * led * * * to * * * an additional check [for blue coat] of the bonding points in the centre tank. * * * More recently, another internal review [introduced] additional work [installing bonding points] for aeroplanes under Configuration 03 * * * and additional work [bonding the fuel jettison system-- blanking plates] on the wing tanks for aeroplanes under Configuration 07 * * *.
The unsafe condition is damage to wiring in the wing, center, and trim fuel tanks, due to failed P-clips used for retaining the wiring and pipes, which could result in a possible fuel ignition source in the wing, center, or trim fuel tanks. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.