Airworthiness Directive · Amendment 39-22838 · Electrical power
Bombardier, Inc., Airplanes
This AD applies to Bombardier, Inc., Model BD-700-2A12 airplanes, certificated in any category, serial numbers 70006 through 70166 inclusive.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-700-2A12 airplanes. This AD was prompted by a report indicating that the fan in a transformer rectifier unit (TRU) can become inoperative in a manner that is not detectable by the fan monitoring circuit. This AD requires replacement of the existing TRU Number 2 with a new part number that incorporates a correction to the fan and the monitoring circuit. This AD also prohibits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.
Within 1,500 flight hours or 3 years, whichever occurs first after the effective date of this AD, replace TRU Number 2 part number (P/N) G02404521-001 with P/N G02404521-003, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 700-24-7507, Revision 2, dated October 16, 2023.
