Airworthiness Directive · Amendment 39-16838 · Fuselage
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Airplanes
This AD applies to Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135ER, -135KE, -135KL, and -135LR airplanes; and Model EMB-145, -145ER, -145MR, -145LR, -145MP, and -145EP airplanes; certificated in any category; equipped with titanium auxiliary power unit (APU) firewall part number (P/N) 145-47494-401, 145-26850-401, 145-26850-601, or 145-47494-403.
We are adopting a new airworthiness directive (AD) for certain Model EMB-135ER, -135KE, -135KL, and -135LR airplanes; and Model EMB- 145, -145ER, -145MR, -145LR, -145MP, and -145EP airplanes. 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:
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 3,300 flight hours after the effective date of this AD, do a detailed inspection for cracking of the rearward and forward face of the APU firewall, including its attachment to the fuselage, removing neither the structural reinforcements nor the dampers, in accordance with Task 05-20-47-200-801-A, Rear Fuselage II—Aft of Rear Pressure Bulkhead—Internal General Visual Inspection, of Subject 5-20-47, Rear Fuselage II—Aft of Rear Pressure Bulkhead—Internal, and Task 05-20-57-200-801-A, Rear Fuselage II—Tail Cone Fairing—Internal General Visual Inspection, of Subject 5-20-57, Rear Fuselage II—Tail Cone Fairing—Internal, of Chapter 5, Time Limits Maintenance Checks, of EMBRAER EMB145 Aircraft Maintenance Manual, Part II, AMM-145/1124, Revision 54, dated April 28, 2011.
(1) If no cracking is found during any inspection required by paragraph (g) of this AD, repeat the inspection thereafter at intervals not to exceed 6,600 flight hours, until the terminating action specified in paragraph (h) of this AD has been accomplished.
(2) If any cracking is found during any inspection required by paragraph (g) of this AD, before further flight, repair in accordance with Subject 53-32-13, Rear Fuselage II—APU Firewall, of Chapter 53, Fuselage, of the EMBRAER EMB135, ERJ140, EMB145, Structural Repair Manual, SRM-145/1142, Revision 43, dated December 1, 2010; or in accordance with a method approved by the International Branch, ANM-116, Transport Airplane Directorate, FAA; or Agência Nacional de Aviação Civil (ANAC) (or its delegated agent). Within 6,600 flight hours after doing the repair, do the inspection required by paragraph (g) of this AD and repeat the inspection thereafter at intervals not to exceed 6,600 flight hours, until the terminating action specified in paragraph (h) of this AD has been accomplished.
Note 1: For the purpose of this AD, a detailed inspection is: “An intensive examination of a specific item, installation or assembly to detect damage, failure or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate access procedures may be required.”
Replacing the APU firewall having P/N 145-47494-401, 145-26850-401, 145-26850-601, or 145-47494-403, with a new APU firewall having P/N 145-47494-607, in accordance with the Accomplishment Instructions of EMBRAER Service Bulletin 145-53-0062, Revision 07, dated May 27, 2011, terminates the repetitive inspections required by paragraphs (g)(1) and (g)(2) of this AD.
(i) Actions done before the effective date of this AD, in accordance with Task 05-20-47-200-801-A, Rear Fuselage II—Aft of Rear Pressure Bulkhead—Internal General Visual Inspection, of Subject 5-20-47, Rear Fuselage II—Aft of Rear Pressure Bulkhead—Internal, of Chapter 5, Time Limits Maintenance Checks, of EMBRAER EMB145 Aircraft Maintenance Manual, Part II, AMM-145/1124, Revision 53, dated October 28, 2010, are acceptable for compliance with the requirements of paragraph (g) of this AD.
(j) Actions done before the effective date of this AD, in accordance with the applicable service bulletin specified in table 1 of this AD, are acceptable for compliance with the requirements of paragraph (h) of this AD.
| EMBRAER Service Bulletin— | Revision— | Dated— |
|---|---|---|
| 145-53-0062 | 06 | August 11, 2010. |
| 145-53-0062 | 05 | May 20, 2008. |
| 145-53-0062 | 04 | November 23, 2007. |
| 145-53-0062 | 03 | September 21, 2007. |
| 145-53-0062 | 02 | January 25, 2006. |
| 145-53-0062 | 01 | October 28, 2005. |
| 145-53-0062 | July 29, 2005. |
Note 2: This AD differs from the MCAI and/or service information as follows: (1) The MCAI AD does not specify how to do the inspection for cracking. This AD requires doing a detailed inspection of the rearward and forward face of the APU firewall, including its attachment to the fuselage, in accordance with Task 05-20-47-200-801-A, Rear Fuselage II—Aft of Rear Pressure Bulkhead—Internal General Visual Inspection, of Subject 5-20-47, Rear Fuselage II—Aft of Rear Pressure Bulkhead—Internal, and Task 05-20-57-200-801-A, Rear Fuselage II—Tail Cone Fairing—Internal General Visual Inspection, of Subject 5-20-57, Rear Fuselage II—Tail Cone Fairing—Internal, of Chapter 5, Time Limits Maintenance Checks, of EMBRAER EMB145 Aircraft Maintenance Manual, Part II, AMM-145/1124, Revision 54, dated April 28, 2011. (2) Where Subjects 5-20-47, Rear Fuselage II—Aft of Rear Pressure Bulkhead—Internal, and 5-20-57, Rear Fuselage II—Tail Cone Fairing—Internal, of Chapter 5, Time Limits Maintenance Checks, of EMBRAER EMB145 Aircraft Maintenance Manual, Part II, AMM-145/1124, Revision 54, dated April 28, 2011, specify an internal general visual inspection, this AD requires a detailed inspection.
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.
