Airworthiness Directive · Amendment 39-17767 · Flight controls
Bombardier, Inc. Airplanes
This AD applies to all Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category, serial numbers 7003 and subsequent.
We are adopting a new airworthiness directive (AD) for all Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This AD was prompted by reports of burr marks on the primary wheels, and cracked rings on the primary wheel shaft, on certain horizontal stabilizer trim actuators (HSTAs). This AD requires replacing certain HSTAs. We are issuing this AD to prevent burr marks on the primary wheels, and cracked rings on the primary wheel shaft, on certain HSTAs, which may lead to a disconnect of the pitch trim surface and subsequent loss of pitch control, resulting in loss of control of the airplane.
Within 1,000 flight hours or 4 months after the effective date of this AD, whichever occurs first, inspect to determine if any HSTA having part number (P/N) 601R92305-5 or vendor P/N 8396-4, with serial numbers (S/N)s 287, 724, 813, 841, 998, 1031, 1035, 1049, 1053, 1067, 1068, 1136, 1252, 1268, 1303, 1319, 1338, 1354, 1374, 1378, 1445, 1470, 1498, 1513, 1546, 1632, 1736, 1766, 1846, 1849, 2002 through 2009, 2011, 2013 through 2016, 2019, 2020, and 2022 is installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number of the HSTA can be conclusively determined from that review.
Within 1,000 flight hours or 4 months after the effective date of this AD, whichever occurs first, replace any affected HSTA identified in paragraph (g) of this AD with a serviceable HSTA, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 601R-27-159, dated June 15, 2011.
As of the effective date of this AD, no person may install any HSTA having P/N 601R92305-5 or vendor P/N 8396-4 with a serial number listed in paragraph (g) of this AD, unless the serial number has the suffix “A” beside it.
