Summary
We propose to revise an existing airworthiness directive (AD) that applies to certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes; all Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes; all Model CL-600-2D15 (Regional Jet Series 705) airplanes; and all Model CL-600-2D24 (Regional Jet Series 900) airplanes. The existing AD currently requires replacing certain water accumulator assemblies having a certain part installed on the pitot and static lines of the air data computer (ADC). Since we issued that AD, an error was discovered in one service document number, and we have determined that credit for accomplishing actions in another erroneously cited service document should be removed from that AD. This proposed AD would correct the erroneous service document number and remove the other erroneously cited service document from that AD. We are proposing this AD to prevent pitot-static tubing from becoming partially or completely blocked bywater, which could result in erroneous airspeed and altitude indications and consequent loss of control of the airplane.