Airworthiness Directive · Amendment 39-16065 · Flight controls
Bombardier 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
Superseded. A later AD replaced this one: AD 2010-20-15. Comply with the one in force.
This AD applies to Bombardier 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; certificated in any category, that are equipped with Thales angle of attack (AOA) transducers having part number C16258AA.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(1) Within the applicable compliance times specified in Table 1 of this AD: Measure the inrush current of both AOA transducers, in accordance with Part A of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009.
| For any AOA transducer that, as of the effective date of this AD, has accumulated— | Do the initial inrush current measurement— |
|---|---|
| Less than 6,500 total flight hours | Before the AOA transducer has accumulated 7,500 total flight hours. |
| More than or equal to 6,500 total flight hours but less than 7,500 total flight hours | Within 500 flight hours after the effective date of this AD but before the AOA transducer has accumulated 8,000 total flight hours. |
| More than or equal to 7,500 total flight hours | Within 250 flight hours after the effective date of this AD. |
(2) If, during any measurement required by paragraph (f)(1) of this AD, an AOA transducer is found to have an inrush current less than 1.60 amps (“degraded” transducer), before further flight replace the transducer with a new or serviceable transducer, in accordance with Part C of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-051, dated May 14, 2009. Do the measurement specified in paragraph (f)(1) of this AD for that replacement transducer at the times specified in (f)(2)(i) or (f)(2)(ii) of this AD.
(i) At the applicable time specified in Table 2 of this AD if the degraded transducer was replaced with a serviceable transducer that is not new; or
(ii) Within 2,000 flight hours after replacement if the degraded transducer was replaced with a new one.
(3) If, during any measurement required by paragraph (f)(1) of this AD, an AOA transducer is found to have an inrush current more than or equal to 1.60 amps, repeat the measurement specified in paragraph (f)(1) of this AD thereafter at intervals not to exceed the applicable interval specified in Table 2 of this AD.
| If the last inrush current measurement of the serviceable AOA transducer is— | Then repeat the measurement— |
|---|---|
| More than or equal to 1.90 amps | Within 2,000 flight hours after the last measurement. |
| More than or equal to 1.80 amps but less than 1.90 amps | Within 1,500 flight hours after the last measurement. |
| More than or equal to 1.70 amps but less than 1.80 amps | Within 1,000 flight hours after the last measurement. |
| More than or equal to 1.60 amps but less than 1.70 amps | Within 500 flight hours after the last measurement. |
Note: This AD differs from the MCAI and/or service information as follows: This AD does not require the one-time inspection for serial numbers and on-condition replacement in Paragraph 1. of the MCAI. The planned compliance times for this action would allow enough time to provide notice and opportunity for prior public comment on the merits of those actions. Therefore, we are considering further rulemaking to address this issue.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
