# AD 2005-13-06: Auxiliary power unit (APU) - Type: Airworthiness directive - Status: Current - Products: BAE Systems Avro 146-RJ100A, Avro 146-RJ70A, Avro 146-RJ85A, BAe 146-100A, BAe 146-200A and BAe 146-300A - Effective: July 26, 2005 - Published: June 21, 2005, 70 FR 35518–35519 - Issued: June 9, 2005 - Issued as: Final rule - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-14142 - Docket: FAA-2005-20757 (https://www.regulations.gov/docket/FAA-2005-20757) - Project: 2004-NM-192-AD - Registered aircraft: 22 may be affected, by airframe or engine model (OpenAirDocs) - Official PDF: https://openairdocs.org/files/sha256/9e/79/9e79ad8547009295b5d056928457d028366c33017f7db139d661b4d47f6ef09c (from https://www.govinfo.gov/content/pkg/FR-2005-06-21/pdf/05-12004.pdf) - Federal Register: https://www.federalregister.gov/documents/2005/06/21/05-12004/airworthiness-directives-bae-systems-operations-limited-model-bae-146-and-avro-146-rj-airplanes - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C6E8B83DF8A2774E8625702700593B86.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/2005-13-06 ## Summary The FAA is adopting a new airworthiness directive (AD) for certain BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ airplanes. This AD requires modifying the auxiliary power unit (APU) exhaust duct in the environmental control system (ECS) bay; installing new, improved insulation on this APU exhaust duct; and replacing the existing drain pipe with a new exhaust drain pipe blank. This AD is prompted by a determination that the temperature of the skin of the APU exhaust duct in the ECS bay is higher than the certificated maximum temperature for this area. We are issuing this AD to prevent the potential for ignition of fuel or hydraulic fluid, which could leak from pipes running through the ECS bay. Ignition of these flammable fluids could result in a fire in the ECS bay. ## The airworthiness directive ### Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: 1. The authority citation for part 39 continues to read as follows: ## Rule preamble ### Dates This AD becomes effective July 26, 2005. The incorporation by reference of a certain publication listed in the AD is approved by the Director of the Federal Register as of July 26, 2005. ### Addresses For service information identified in this AD, contact British Aerospace Regional Aircraft American Support, 13850 Mclearen Road, Herndon, Virginia 20171. Docket: The AD docket contains the proposed AD, comments, and any final disposition. You can examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Management Facility office (telephone (800) 647-5227) is located on the plaza level of the Nassif Building at the U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, Washington, DC. This docket number is FAA-2005-20757; the directorate identifier for this docket is 2004-NM-192-AD. ### For further information contact Dan Rodina, Aerospace Engineer, International Branch, ANM-116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 227-2125; fax (425) 227-1149. ### SUPPLEMENTARY INFORMATION The FAA proposed to amend 14 CFR part 39 with an AD for certain BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ airplanes. That action, published in the Federal Register on March 30, 2005 (70 FR 16185), proposed to require modifying the auxiliary power unit (APU) exhaust duct in the environmental control system bay; installing new, improved insulation on this APU exhaust duct; and replacing the existing drain pipe with a new exhaust drain pipe blank. ### Explanation of Change to Applicability We have revised the applicability of the proposed AD to identify model designations as published in the most recent type certificate data sheet for the affected models. ### Comments We provided the public the opportunity to participate in the development of this AD. No comments have been submitted on the proposed AD or on the determination of the cost to the public. ### Conclusion We have carefully reviewed the available data and determined that air safety and the public interest require adopting the AD with the change described previously. We have determined that this change will neither increase the economic burden on any operator nor increase the scope of the AD. ### Costs of Compliance This AD will affect about 65 airplanes of U.S. registry. The actions will take about 1 work hour per airplane, at an average labor rate of $65 per work hour. Required parts will cost about $3,766 per airplane. Based on these figures, the estimated cost of the AD for U.S. operators is $249,015, or $3,831 per airplane. ### Authority for This Rulemaking Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency's authority. We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, “General requirements.” Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. ### Regulatory Findings We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify that this AD: (1) Is not a “significant regulatory action” under Executive Order 12866; (2) Is not a “significant rule” under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. We prepared a regulatory evaluation of the estimated costs to comply with this AD. See the ADDRESSES section for a location to examine the regulatory evaluation. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A49EU](https://openairdocs.org/tcds/A49EU): BAE Systems (Operations) Limited; names 6 of 6 models: Avro 146-RJ85A, BAe 146-300A, BAe 146-100A, Avro 146-RJ70A, Avro 146-RJ100A, BAe 146-200A ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 22 (22 by airframe model, 0 by engine model) - Makers: British Aerospace 20, BAE Systems 2 Models with the most aircraft: - [British Aerospace AVRO 146-RJ85A](https://openairdocs.org/model/british-aerospace-avro-146-rj85a): 12 aircraft (airframe model) - [British Aerospace BAE 146 SERIES 200A](https://openairdocs.org/model/british-aerospace-bae-146-series-200a): 8 aircraft (airframe model) - [BAE Systems AVRO 146-RJ85A](https://openairdocs.org/model/bae-systems-avro-146-rj85a): 2 aircraft (airframe model) All 3 models: https://openairdocs.org/ad/2005-13-06/models.md Every aircraft: https://openairdocs.org/ad/2005-13-06/aircraft.md ## Related documents - [Proposed rule FAA-2005-20757](https://openairdocs.org/proposed/FAA-2005-20757): Notice of proposed rulemaking (NPRM), published Mar 30, 2005 Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.