# AD 2021-09-10: Turbine Engine Compressor Section - Type: Airworthiness directive - Status: Current - Products: Pratt & Whitney JT9D-20, JT9D-20J, JT9D-3A, JT9D-59A, JT9D-7, JT9D-70A, JT9D-7A, JT9D-7AH, JT9D-7F, JT9D-7H, JT9D-7J, JT9D-7Q and 8 more - Effective: May 27, 2021 - Published: April 22, 2021, 86 FR 21181–21185 - Issued: April 16, 2021 - Issued as: Final rule - Supersedes: [AD 2012-04-15](https://openairdocs.org/ad/2012-04-15) - Superseded by: Nothing supersedes this AD - Product type: Engine, Large airplane - ATA chapter: 72 · Engine - Amendment: 39-21524 - Docket: FAA-2020-1116 (https://www.regulations.gov/docket/FAA-2020-1116) - Project: AD-2020-00784-E - Registered aircraft: 24 may be affected, by airframe or engine model (OpenAirDocs) - Official PDF: https://openairdocs.org/files/sha256/9d/42/9d4235523bb8781181fcfa81a8ab333e51b9eb344c1d973e1780e58dd7b3c034 (from https://www.govinfo.gov/content/pkg/FR-2021-04-22/pdf/2021-08327.pdf) - Federal Register: https://www.federalregister.gov/documents/2021/04/22/2021-08327/airworthiness-directives-pratt-and-whitney-turbofan-engines - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7AA911D7A3C5F320862586BF0054E245.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/2021-09-10 ## Summary The FAA is superseding Airworthiness Directive (AD) 2012-04-15 for all Pratt & Whitney (PW) JT9D-3A, JT9D-7, JT9D-7A, JT9D-7AH, JT9D-7F, JT9D-7H, JT9D-7J, JT9D-7Q, JT9D-7Q3, JT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, JT9D-7R4E1, JT9D-7R4E4, JT9D-7R4G2, JT9D-7R4H1, JT9D-20, JT9D-20J, JT9D-59A, and JT9D-70A (JT9D) model turbofan engines. AD 2012-04-15 required revisions to the Airworthiness Limitations Section (ALS) of the manufacturer's Instructions for Continued Airworthiness (ICA) to include required enhanced inspection of selected critical life-limited parts at each piece-part opportunity. AD 2012-04-15 also required additional revisions to the ALS of the manufacturer's ICA for JT9D model turbofan engines. This AD requires revising the required inspections of selected critical life-limited parts specified in the ALS of the manufacturer's ICA and, for air carriers, to the existing continuous airworthiness air carrier maintenance program (CAMP). The FAA is issuing this AD to address the unsafe condition on these products. ## The airworthiness directive 1. The authority citation for part 39 continues to read as follows: 2. The FAA amends § 39.13 by: a. Removing Airworthiness Directive 2012-04-15, Amendment 39-16971 (77 FR 15939, March 19, 2012); and b. Adding the following new airworthiness directive: 2021-09-10 Pratt & Whitney: Amendment 39-21524; Docket No. FAA-2020-1116; Project Identifier AD-2020-00784-E. ### (a) Effective Date This airworthiness directive (AD) is effective May 27, 2021. ### (b) Affected ADs This AD replaces AD 2012-04-15, Amendment 39-16971 (77 FR 15939, March 19, 2012). ### (c) Applicability This AD applies to all Pratt & Whitney (PW) JT9D-3A, JT9D-7, JT9D-7A, JT9D-7AH, JT9D-7F, JT9D-7H, JT9D-7J, JT9D-7Q, JT9D-7Q3, JT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, JT9D-7R4E1, JT9D-7R4E4, JT9D-7R4G2, JT9D-7R4H1, JT9D-20, JT9D-20J, JT9D-59A, and JT9D-70A (JT9D) model turbofan engines. ### (d) Subject Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor Section. ### (e) Unsafe Condition This AD was prompted by the need to require enhanced inspection of selected critical life-limited parts of PW JT9D model turbofan engines. The FAA is issuing this AD to prevent the failure of critical life-limited rotating engine parts. The unsafe condition, if not addressed, could result in uncontained part release, damage to the engine, and damage to the airplane. ### (f) Compliance Comply with this AD within the compliance times specified, unless already done. ### (g) Required Actions Within 30 days after the effective date of this AD, add Figure 1 to paragraph (g) of this AD to the Airworthiness Limitations Section (ALS) of the manufacturer's Instructions for Continued Airworthiness (ICA) and, for air carrier operations, to the existing continuous airworthiness air carrier maintenance program. [graphic omitted; see the official PDF] [graphic omitted; see the official PDF] ### (h) Alternative Methods of Compliance (AMOCs) (1) The Manager, ECO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in Related Information. You may email your request to: ANE-AD-AMOC@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. ### (i) Related Information For more information about this AD, contact Nicholas Paine, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-7742; fax: (781) 238-7199; email: nicholas.j.paine@faa.gov. ### (j) Material Incorporated by Reference None. ## Rule preamble ### Dates This AD is effective May 27, 2021. ### For further information contact Nicholas Paine, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-7742; fax: (781) 238-7199; email: nicholas.j.paine@faa.gov. ### Background The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to supersede AD 2012-04-15, Amendment 39-16971 (77 FR 15939, March 19, 2012), (AD 2012-04-15). AD 2012-04-15 applied to all PW JT9D model turbofan engines. The NPRM published in the Federal Register on December 15, 2020 (85 FR 81162). The NPRM was prompted by the need to require enhanced inspection of selected critical life-limited parts of PW JT9D model turbofan engines. Since the FAA issued AD 2012-04-15, PW identified errors in the list of mandatory inspections to add to the ALS. During review of the AD, PW found that AD 2012-04-15 did not include eddy current inspections of the fan hubs. Additionally, PW identified duplicate inspections of the HPT Stage 2 disk tie rod and web cooling holes. In the NPRM, the FAA proposed to require revising the required inspections of selected critical life-limited parts specified in the ALS of the manufacturer's ICA and, for air carriers, to the existing CAMP. The FAA is issuing this AD to address the unsafe condition on these products. ### Comments The FAA received comments from two commenters. The commenters were Atlas Air Inc. (Atlas Air) and Boeing Commercial Airplanes (Boeing). The following presents the comments received on the NPRM and the FAA's response to each comment. ### Request To Add Missing Figure Label Atlas Air requested that the FAA add the figure label to paragraph (g), Required Actions, of this AD. The FAA agrees and notes that a formatting issue resulted in the missing figure label from Figure 1 to paragraph (g) in the NPRM. The FAA expects this formatting issue will be corrected with the publication of this final rule. ### Addition of Engine Models to Figure The FAA determined the need to update Figure 1 to paragraph (g) of this AD to specifically reference PW JT9D-7R4G2, and JT9D-7R4H1 model turbofan engines. AD 2012-04-15 included these engines under “7R4 ALL,” however, the FAA inadvertently left these engines out of Figure 1 when identifying the individual engine models in the proposed rule. This revision does not change the number of affected engines that the FAA estimated in the NPRM and imposes no additional burden on operators of U.S. airplanes. ### Support for the AD Boeing expressed support for the AD as written. ### Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting the AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on these products. Except for minor editorial changes and any other changes described previously, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator. ### Costs of Compliance The FAA estimates that this AD affects 27 engines installed on airplanes of U.S. registry. Based on updated information since the publication of AD 2012-04-15, the FAA reduced the estimated number of engines installed on airplanes of U.S. registry from 438 in AD 2012-04-15 to 27 in this final rule. The FAA estimates the following costs to comply with this AD: *Estimated Costs* | Action | Labor cost | Parts cost | Cost per product | Cost on U.S. operators | | --- | --- | --- | --- | --- | | Update ALS | 1 work-hour × $85 per hour = $85 | $0 | $85 | $2,295 | ### 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. The FAA is 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 The FAA has 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) Will not affect intrastate aviation in Alaska, 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. ### The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E3NE](https://openairdocs.org/tcds/E3NE): Pratt & Whitney; names 11 of 11 models: JT9D-7Q, JT9D-7Q3, JT9D-7R4E4, JT9D-7R4E, JT9D-70A, JT9D-7R4H1, JT9D-7R4D1, JT9D-7R4D… - [TCDS E20EA](https://openairdocs.org/tcds/E20EA): Pratt & Whitney; names 9 of 9 models: JT9D-7, JT9D-7AH, JT9D-7J, JT9D-3A, JT9D-7F, JT9D-7A, JT9D-20, JT9D-7H… ## 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: 24 (0 by airframe model, 24 by engine model) - Makers: Boeing 19, Airbus Industrie 2, Douglas 2, Mcdonnell Douglas 1 Models with the most aircraft: - [Pratt & Whitney JT9D series](https://openairdocs.org/engine/pratt-whitney-jt9d-series): 13 aircraft (engine model) - [Pratt & Whitney JT9D-7R4D](https://openairdocs.org/engine/pratt-whitney-jt9d-7r4d): 4 aircraft (engine model) - [Pratt & Whitney JT9D-3A](https://openairdocs.org/engine/pratt-whitney-jt9d-3a): 4 aircraft (engine model) - [Pratt & Whitney JT9D-7](https://openairdocs.org/engine/pratt-whitney-jt9d-7): 1 aircraft (engine model) - [Pratt & Whitney JT9D-59A](https://openairdocs.org/engine/pratt-whitney-jt9d-59a): 1 aircraft (engine model) - [Pratt & Whitney JT9D-7R4E](https://openairdocs.org/engine/pratt-whitney-jt9d-7r4e): 1 aircraft (engine model) All 6 models: https://openairdocs.org/ad/2021-09-10/models.md Every aircraft: https://openairdocs.org/ad/2021-09-10/aircraft.md ## Related documents - [AD 2012-04-15](https://openairdocs.org/ad/2012-04-15) (historical): Engine · Pratt & Whitney Division JT9D-20J, JT9D-3A, JT9D-59A and 16 more. Effective Apr 23, 2012. Replaced by this AD - [Proposed rule FAA-2020-1116](https://openairdocs.org/proposed/FAA-2020-1116): Notice of proposed rulemaking (NPRM), published Dec 15, 2020 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.