Airworthiness Directive · Amendment 39-14527 · Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 Airplanes and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 Airplanes and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes
This AD applies to EMBRAER Model EMB-135BJ, -135ER, -135KE, -135KL, -135LR, -145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP airplanes; certificated in any category; as identified in EMBRAER Service Bulletin 145-27-0106, Revision 02 (for all affected airplanes except Model EMB-135BJ airplanes); and EMBRAER Service Bulletin 145LEG-27-0016, Revision 02 (for Model EMB-135BJ airplanes only); both dated March 14, 2005.
The FAA is adopting a new airworthiness directive (AD) for certain EMBRAER Model EMB-135 airplanes and Model EMB-145, -145ER, - 145MR, -145LR, -145XR, -145MP, and -145EP airplanes. This AD requires replacing the horizontal stabilizer control unit (HSCU) with a modified and reidentified or new, improved HSCU. For certain airplanes, this AD also requires related concurrent actions as necessary. This AD is prompted by reports of loss of the pitch trim system due to a simultaneous failure of both channels of the HSCU. We are issuing this AD to prevent loss of pitch trim and reduced 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.
Within 18 months or 4,000 flight hours after the effective date of this AD, whichever occurs first, replace the HSCU with a modified and reidentified or new, improved HSCU having part number 362100-1013, by doing all the actions specified in the Accomplishment Instructions of the applicable EMBRAER service bulletin specified in Table 1 of this AD. Actions accomplished using the alternative sources of service information shown in Table 2 of this AD are considered acceptable for compliance with the requirements of this paragraph. Doing the requirements of this paragraph before the compliance time specified in paragraph (b) of AD 2004-25-21 eliminates the requirement to accomplish the actions required by paragraph (b)(1) of AD 2004-25-21.
| EMBRAER service bulletin | Revision level | Dated |
|---|---|---|
| 145-27-0106 | 02 | March 14, 2005. |
| 145LEG-27-0016 | 02 | March 14, 2005. |
| EMBRAER service bulletin | Revision level | Dated |
|---|---|---|
| 145-27-0084 | 06 | March 14, 2005. |
| 145LEG-27-0002 | 02 | August 24, 2005. |
For airplanes identified in the EMBRAER service bulletins listed in Table 3 of this AD: Prior to or concurrently with the actions required by paragraph (f) of this AD, replace the HSCU with a new HSCU with improved features, and having a new part number, in accordance with EMBRAER Service Bulletin 145LEG-27-0002, Revision 01, dated April 15, 2003; or 145-27-0084, Revision 04, dated October 21, 2003; as applicable. Accomplishing this replacement eliminates the requirement to accomplish all actions required by paragraphs (a)(1), (a)(2), (b)(2), (b)(3), (b)(4)(i), (b)(4)(ii), (b)(5), (b)(6), and (b)(7) of AD 2004-25-21.
| EMBRAER service bulletin | Paragraph | Revision level | Dated |
|---|---|---|---|
| 145-27-0084 | 1.A.(1), 1.A.(2), 1.A.(3), 1.A.(4), and 1.A.(5) | 04 | October 21, 2003. |
| 145-27-0096 | 1.A.(1) and 1.A.(2) | 04 | March 14, 2005. |
| 145-27-0106 | 1.A. | 02 | March 14, 2005. |
| 145LEG-27-0002 | 1.A.(1) and 1.A.(2) | 01 | April 15, 2003. |
| 145LEG-27-0016 | 1.A. | 02 | March 14, 2005. |
Actions accomplished before the effective date of this AD in accordance with the EMBRAER service bulletins listed in Table 4 of this AD are considered acceptable for compliance with the applicable action in this AD.
| EMBRAER service bulletin | Revision level | Dated |
|---|---|---|
| 145-27-0084 | 05 | August 24, 2004. |
| 145-27-0106 | Original | August 4, 2004. |
| 145-27-0106 | 01 | August 30, 2004. |
| 145LEG-27-0016 | Original | August 4, 2004. |
| 145LEG-27-0016 | 01 | August 30, 2004. |
(i) As of the effective date of this AD, no person may install an HSCU on any airplane unless it has been modified according to the requirements of this AD.
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.
