Airworthiness Directive · Amendment 39-17729 · Flight controls
Bombardier, Inc. Airplanes
Superseded. A later AD replaced this one: AD 2018-11-09. Comply with the one in force.
This AD applies to the Bombardier, Inc. airplanes identified in paragraphs (c)(1) and (c)(2) of this AD, certificated in any category.
(1) Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, serial numbers 10002 through 10333 inclusive.
(2) Model CL-600-2D15 (Regional Jet Series 705) airplanes; and Model CL-600-2D24 (Regional Jet Series 900) airplanes, serial numbers 15001 through 15288 inclusive.
We are superseding Airworthiness Directive (AD) 2011-03- 13 for certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, Model CL-600-2D15 (Regional Jet Series 705) airplanes, and Model CL-600-2D24 (Regional Jet Series 900) airplanes. AD 2011-03-13 required repetitive inspections of the rudder travel limiter (RTL) return springs and primary actuator, and corrective actions if necessary. This new AD requires replacing certain RTL return springs, including doing related investigative and corrective actions, if necessary; which is terminating action for the repetitive inspections. This new AD also revises the applicability. This AD was prompted by reports of failure of the RTL return spring. We are issuing this AD to prevent failure of the RTL, which would permit an increase of rudder authority beyond normal structural limits and consequently affect the controllability of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
This paragraph restates the requirements of paragraph (g) of AD 2011-03-13, Amendment 39-16597 (76 FR 6539, February 7, 2011). Except for Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplane, serial number 10002, for airplanes that have accumulated 4,000 or less total flight hours as of March 14, 2011 (the effective date of AD 2011-03-13): Before the accumulation of 6,000 total flight hours, do a detailed inspection of the RTL for broken return springs and damage through the casing, or chafing of the casing of the primary actuator, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-055, Revision A, dated August 6, 2010. Before further flight, replace any broken return springs with new springs, and repair or replace with a new actuator any chafed or damaged primary actuator, as applicable, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-055, Revision A, dated August 6, 2010. Repeat the inspection thereafter at intervals not to exceed 6,000 flight hours. Accomplishment of the actions required by paragraph (j) of this AD terminates the requirements of this paragraph.
This paragraph restates the requirements of paragraph (h) of AD 2011-03-13, Amendment 39-16597 (76 FR 6539, February 7, 2011). Except for Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplane, serial number 10002, for airplanes that have accumulated more than 4,000 total flight hours as of March 14, 2011 (the effective date of AD 2011-03-13): Within 2,000 flight hours after March 14, 2011 (the effective date of AD 2011-03-13), do a detailed inspection of the RTL for broken return springs and damage through the casing, or chafing of the casing of the primary actuator, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-055, Revision A, dated August 6, 2010. Before further flight, replace any broken return springs with new springs, and repair or replace any chafed or damaged primary actuator with a new actuator, as applicable, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-055, Revision A, dated August 6, 2010. Repeat the inspection thereafter at intervals not to exceed 6,000 flight hours. Accomplishment of the actions required by paragraph (j) of this AD terminates the requirements of this paragraph.
For Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplane, serial number 10002, at the applicable time specified in paragraph (i)(1) or (i)(2) of this AD: Do a detailed inspection of the RTL for broken return springs and damage through the casing, or chafing of the casing of the primary actuator, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-055, Revision A, dated August 6, 2010. Before further flight, replace any broken return springs with new springs, and repair or replace with a new actuator any chafed or damaged primary actuator, as applicable, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-055, Revision A, dated August 6, 2010. Repeat the inspection thereafter at intervals not to exceed 6,000 flight hours. Accomplishment of the applicable actions required by paragraph (j) of this AD terminates the requirements of this paragraph.
(1) If the airplane has accumulated 4,000 or less total flight hours as of the effective date of this AD: Before the accumulation of 6,000 total flight hours.
(2) If the airplane has accumulated more than 4,000 total flight hours as of the effective date of this AD: Within 2,000 flight hours after the effective date of this AD.
At the applicable time specified in paragraph (j)(1) or (j)(2) of this AD: Replace the RTL return springs with new springs, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-059, Revision B, dated September 26, 2013. Do all applicable related investigative and corrective actions before further flight. Accomplishment of the applicable actions required by this paragraph terminates the requirements of paragraphs (g), (h), and (i) of this AD.
(1) For airplanes with RTL return springs having part number (P/N) 670-93465-1: Within 6,000 flight cycles after the effective date of this AD.
(2) For airplanes with RTL return springs having P/N E0650-069-2750S: At the applicable time specified in paragraph (j)(2)(i), (j)(2)(ii), or (j)(2)(iii) of this AD.
(i) For airplanes with 15,400 total flight cycles or more as of the effective date of this AD: Within 2,000 flight cycles after the effective date of this AD.
(ii) For airplanes with 5,200 total flight cycles or more, but less than 15,400 total flight cycles as of the effective date of this AD: Within 5,000 flight cycles after the effective date of this AD, but not to exceed 17,400 total flight cycles.
(iii) For airplanes with less than 5,200 total flight cycles as of the effective date of this AD: Before accumulating 10,200 total flight cycles.
