Airworthiness Directive · Amendment 39-15098 · Aerospatiale Model ATR42 and ATR72 Airplanes
Aerospatiale Model ATR42 and ATR72 Airplanes
This AD applies to Model ATR42-200, -300, -320, and -500 airplanes; all serial numbers up to manufacturer serial number (MSN) 643 inclusive; and Model ATR72-101, -102, -201, -202, -211, -212, and -212A airplanes, all serial numbers up to MSN 728 inclusive, except MSN 723 and 725; certificated in any category.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an airworthiness authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as electrical arcing due to chafing between a bonding cable and electrical wires in the 120 VU (volt unit) electrical harness, causing the loss of some instruments and loss of one hydraulic circuit pressure (i.e., loss of pressure of one hydraulic circuit). We are issuing this AD to require actions to correct the unsafe condition on these products.
Unless already done, do the following actions. Within 3 months after the effective date of this AD: Inspect the harness installation in the 120 VU electrical harness and, as applicable, restore correct installation of the bonding cable, in accordance with the instructions given by Avions de Transport Regional Service Bulletins ATR42-92-0012 (for Model ATR42 airplanes) and ATR72-92-1013 (for Model ATR72 airplanes), both dated July 4, 2006; or Revision 01, both dated December 7, 2006; as applicable.
Note: This AD differs from the MCAI and/or service information as follows: No differences.
