Oh this is very true
"
August 14, 2003 From the editors of Aviation International News
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Breaking Stories
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Learjet 45 Fleet Grounded Until Fix Is Made
An AD issued yesterday has effectively grounded the U.S.-registered fleet of 175 Bombardier Learjet 45s (and about 11 others in the UK, as a result of a similar AD by the CAA). AD 2003-16-19 stems from an incident last March in Australia in which a Learjet 45 experienced “severe vibration followed by a rapid nose-down pitch change.” The crew was able to maintain control of the aircraft and land safety. The ensuing investigation determined the incident was due to failure of the horizontal stabilizer actuator jackscrew and resulted in an April 11 AD requiring the replacement of part number T/N6627401000-001 with newly approved -005. But the FAA has decided that while P/N-005 is an improvement over P/N-001, the new part “was not manufactured per the type design data. A brittle fracture could occur. We determined that the configuration and quality controls over the production of these parts were so deficient that we do not have confidence that the airplane can be operated safely for any period of time.” The part is manufactured by MPC Products of Skokie, Ill. Owners have until this Saturday to fly the aircraft to a maintenance facility of their choice. According to a Learjet spokesman, the company has faith in P/N-005 and is working with the FAA to prove it will do the job. Bombardier is also working with the FAA on the certification of a new part should approval of P/N-005 not be granted. In either case, the certification process is not expected to conclude until the end of the month, after which replacement parts will start to be shipped. In the interim, supplemental lift will be provided by Skyjet, Bombardier’s air charter operation.
Australia-I believe- has grounded all of their 45's TFN
