Airworthiness Directive · Amendment 39-13895 · Airbus Model A330 and A340 Series Airplanes
Airbus Model A330 and A340 Series Airplanes
This AD applies to Airbus Model A330 and A340 series airplanes, certificated in any category; on which Airbus Modification 47244 (reference Airbus Service Bulletin A330-34-3120 or A340-34-4138) has been done, and on which Airbus Modification 52423 has not been done.
The FAA is adopting a new airworthiness directive (AD) for certain Airbus Model A330 and A340 series airplanes. This AD requires regularly performing a complete electrical shutdown of the airplane to reset the integrated standby instrument system (ISIS). This AD also provides an optional terminating action. This AD is prompted by reports indicating that an airplane lost the ISIS, then, during the same flight, lost all electronic instrument system (EIS) display units. We are issuing this AD to prevent loss of the ISIS, which, if combined with loss of all EIS display units, could reduce the flightcrew's situational awareness and contribute to loss of control of the airplane or impact with obstacles or terrain.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 3 days after the effective date of this AD, or within 5 days after the last ISIS reset or complete electrical shutdown of the airplane, whichever is first, perform a complete electrical shutdown of the airplane to reset the ISIS. Repeat the electrical shutdown of the airplane at intervals not to exceed 5 days, until the actions in paragraph (g) of this AD are done.
Note 1: This AD does not allow resetting the circuit breaker as a means of resetting the ISIS.
Replacing the existing ISIS, part number (P/N) C16221DB04, with an improved ISIS, P/N C16221WA01, in accordance with Airbus Service Bulletin A330-34-3141 (for Airbus Model A330 series airplanes), A340-34-4145 (for Airbus Model A340-200 and -300 series airplanes), or A340-34-5016 (for Airbus Model A340-541 and -642 airplanes); all dated June 8, 2004; as applicable; terminates the requirements of paragraph (f) of this AD.
Note 2: Airbus Service Bulletins A330-34-3141, A340-34-4145, and A340-34-5016 refer to Thales Service Bulletin C16221D-34-002 as an additional source of service information.
