Airworthiness Directive · Amendment 39-14068 · BAE Systems (Operations) Limited Model Avro 146-RJ Series Airplanes
BAE Systems (Operations) Limited Model Avro 146-RJ Series Airplanes
This AD applies to all BAE Systems (Operations) Limited Model Avro 146-RJ series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all BAE Systems (Operations) Limited Model Avro 146-RJ series airplanes. This AD requires an inspection of the Thales Avionics distance bearing indicator (DBI) to determine part number (P/N) and serial number (S/N), and replacement of the affected DBI with a new or modified DBI. This AD is prompted by a report of defective electrical insulators in DBIs. We are issuing this AD to prevent a short circuit in the DBI due to defective electrical insulation, which could potentially cause a loss of primary navigation instruments (such as airspeed indicator, altimeter, and global positioning system (GPS) information).
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 four months after the effective date of this AD, inspect the Thales Avionics DBI to determine whether a part number (P/N) and serial number (S/N) listed in the Effectivity of BAE Systems (Operations) Limited Modification Service Bulletin SB.34-371-70671A, dated September 19, 2003, is installed. Instead of an inspection of the DBI, a review of airplane maintenance records is acceptable if the P/N and the S/N of the DBI can be positively determined from that review.
(1) If the DBI P/N and S/N do not match those listed in the service bulletin, no further action is required by this paragraph.
(2) If the DBI P/N and S/N do match those listed in the service bulletin, within four months after the effective date of this AD, replace the DBI in accordance with the Accomplishment Instructions of the service bulletin. The replacement part must be either a new DBI having P/N 63543-280-1 and a S/N not listed in the service bulletin, or a new DBI having P/N 63543-280-2.
As of the effective date of this AD, no person may install a DBI with a P/N and S/N listed in the Effectivity of BAE Systems (Operations) Limited Modification Service Bulletin SB.34-371-70671A, dated September 19, 2003, on any airplane unless the DBI has been modified in accordance with paragraph (f)(2) of this AD.
Although the service bulletin references a reporting requirement in paragraph 2.C.2, “Documentation,” that reporting is not required by this AD.
