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2011-21-17: Fuel filter differential pressure switch.

FAA order 2011-21-17 is an airworthiness directive in force since November 17, 2011. The FAA's subject line: Fuel filter differential pressure switch. It names the General Electric CT7-8A, General Electric CT7 series engines: about 112 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product
Engine
Makes
General Electric Company
Models
CT7-8A, CT7-8A1, CT7-8E, CT7-8F5
Engine series
General Electric CT7-8A 43 aircraft
General Electric CT7 series 69 aircraft

Dates and paperwork

In force since
November 17, 2011
Published
November 2, 2011 (signed October 4, 2011)
Docket
FAA-2011-0942
Status
Current
The FAA's document
Read the order on the FAA's site

The FAA's summary their words, unchanged

We are adopting a new airworthiness directive (AD) for all General Electric Company (GE) CT7-8A, CT7-8A1, CT7-8E, and CT7-8F5 turboshaft engines with a fuel filter differential pressure switch, part number (P/N) TD028VF0H7Y5 (part of the fuel filter assembly, P/N 4110T53P06) installed. This AD requires daily visual inspections of the fuel filter differential pressure switch for fuel leaks and for excessive cracking of the switch mounting flanges due to stress- corrosion. This AD also requires the installation of a collar kit over the fuel filter differential pressure switch as terminating action to the daily inspections. This AD was prompted by reports of 47 fuel filter differential pressure switches found with stress-corrosion cracking of the mounting flanges. We are issuing this AD to prevent unrecoverable in-flight engine shutdown, engine bay fire due to fuel leakage, and forced landing or accident.

The order itself the regulatory text, as published

Show the full text (4,200 characters)
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39--AIRWORTHINESS DIRECTIVES 0 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. Sec. 39.13 [Amended] 0 2. The FAA amends Sec. 39.13 by adding the following new airworthiness directive (AD): 2011-21-17 General Electric Company: Amendment 39-16840; Docket No. FAA-2011-0942; Directorate Identifier 2011-NE-29-AD. (a) Effective Date This AD is effective November 17, 2011. (b) Affected ADs None. (c) Applicability This AD applies to General Electric Company (GE) CT7-8A, CT7- 8A1, CT7-8E, and CT7-8F5 turboshaft engines, with fuel filter differential pressure switch, part number (P/N) TD028VF0H7Y5 (part of fuel filter assembly, P/N 4110T53P06), installed. (d) Unsafe Condition This AD was prompted by reportsof 47 fuel filter differential pressure switches found with stress-corrosion cracking of the mounting flanges. We are issuing this AD to prevent unrecoverable in-flight engine shutdown, engine bay fire due to fuel leakage, and forced landing or accident. (e) Compliance Comply with this AD within the compliance times specified, unless already done. (1) Starting on the effective date of this AD, perform daily visual inspections of the fuel filter differential pressure switch for leaks and excessive cracking of the mounting flanges. (2) Visually inspect in accordance with paragraph 3, Accomplishment Instructions, of GE Alert Service Bulletin (ASB) No. CT7-8-S/B 73-A0007, dated July 8, 2011. (f) Mandatory Terminating Action (1) As mandatory terminating action to the daily visual inspections, within 4 months after the effective date of this AD, install collar kit, P/N 59TC02800K1T, over the fuel filter differential pressure switch. (2) Install the collar kit in accordance with paragraph 3, Accomplishment Instructions of GE ASB No. CT7-8-S/B 73-A0008, dated August 17, 2011. (g) Special Flight Permits Special flight permits are prohibited. (h) Alternative Methods of Compliance (AMOCs) The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. (i) Related Information For more information about this AD, contact Walter Meibaum, Aerospace Engineer, Engine & Propeller Directorate, FAA, 12 New England Executive Park, Burlington, MA 01803; phone: (781) 238-7119; fax: (781) 238-7199; email: <A = href=3D"mailto:walter.meibaum@faa.gov">walter.meibaum@faa.gov</A>. (j) Material Incorporated by Reference You must use the following service information to do the actions required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference (IBR) under 5 U.S.C. 552(a) and 1 CFR part 51 of the following service information on the date specified: (1) General Electric Company Alert Service Bulletin No. CT7-8-S/ B 73-A0007, dated July 8, 2011, approved for IBR as of November 17, 2011. (2) General Electric Company Alert Service Bulletin No. CT7-8-S/ B 73-A0008, dated August 17, 2011, approved for IBR as of November 17, 2011. (3) For service information identified in this AD, contact GE- Aviation, M/D Rm. 285, One Neumann Way, Cincinnati, OH 45215, phone: (513) 552-3272; email: <A = href=3D"mailto:geae.aoc@ge.com">geae.aoc@ge.com</A>. (4) You may review copies of the service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability of this material at the FAA, call (781) 238-7125. (5) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at an NARA facility, call (202) 741-6030, or go to <A = href=3D"http://www.archives.gov/federal_register/code_of_federal_regulati= ons/ibr_locations.html">http://www.archives.gov/federal_register/code_of_= federal_regulations/ibr_locations.html</A>.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 5, 2026. Connections as data: /graph/directive/2011-21-17.json · aircraft systems.