# AD 84-10-06 R1: Fuel Pump Assemblies - Type: Airworthiness directive - Status: Current - Products: Honeywell International TPE331-1, TPE331-10, TPE331-10B, TPE331-10G, TPE331-10GR, TPE331-10R, TPE331-10U, TPE331-10UA, TPE331-10UF, TPE331-10UG, TPE331-10UGR, TPE331-10UR and 36 more - Effective: December 26, 1984 - Published: December 27, 1984 - Issued: December 6, 1984 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-4964 - Registered aircraft: 662 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/817C431B00157B1A8625683F005D5D12.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/84-10-06-R1 ## The airworthiness directive 84-10-06 R1 GARRETT TURBINE ENGINE COMPANY (GTEC, formerly AIRESEARCH MANUFACTURING COMPANY OF ARIZONA): Amendment 39-4867 as amended by Amendment 39-4964. Applicable to all series of engine models TPE331-25, -43, -47, -55, -1, -2, -3, -5, -6, -10 (except -10A), and -11 equipped with the following fuel pump assemblies: P/N S/N 868531-7/-8 All. 869151-1/-3/-4/-5 All. 893573-1 through -7 All. 895413-1/-9 All. 897380-1/-2/-3 Series 1 & 2. 897380-4/-5 Series 1, 2, & 3. 897390-1/-2/-3/-4 Series 1 & 2. 897400-1/-2 Series 1 & 2. 897400-4 Series 1. Compliance is required as indicated unless already accomplished. To prevent possible engine failure, accomplish the following: (a) Inspect low-time engine fuel control/pump assembly to determine drive shaft running torque as specified in Section 2.A.(2), "Accomplishment Instructions," of GTEC SB TPE331-73-0121, Revision 2 dated April 18, 1984, or equivalent approved by the Manager, Western Aircraft Certification Office, in accordance with the schedule below: Fuel pump assembly time: since new or since last assembled; or engine total time: since new or since last overhauled; whichever is known to be least, Hours Inspect not later than Less than 200 the next 100 hours in service 200 or more, and less than 1,000 the next 200 hours in service 1,000 or more next fuel pump disassembly NOTE: Engine Logbook Records should indicate if a new or reassembled fuel pump assembly has been installed on the engine since new or returned from overhaul. Remove from further service fuel pump assemblies having unsatisfactory running torque inspection results unless modified as specified in Section 2, "Accomplishment Instructions," in SB TPE331-73-0121, Revision 2, or equivalent approved by the Manager, Western Aircraft Certification Office. Fuel control/pump assemblies having satisfactory inspection results may be continued in service until fuel pump disassembly per Paragraph (b) below. (b) Upon disassembly of fuel pump for any reason, reassemble to an approved parts configuration as specified in Section 2, "Accomplishment Instructions," in SB TPE331-73-0121, Revision 2, or equivalent approved by the Manager, Western Aircraft Certification Office. (c) Special flight permits may be issued in accordance with Federal Aviation Regulation FAR 21.197 and FAR 21.199 to ferry aircraft to a maintenance base in order to comply with the requirements of this AD. (d) Alternative means of compliance providing an equivalent level of safety may be used when approved by the Manager, Western Aircraft Certification Office, FAA, Northwest Mountain Region. (e) Upon request of the operator, an FAA Maintenance Inspector, subject to prior approval of the Manager, Western Aircraft Certification Office, FAA, Northwest Mountain Region, may adjust the compliance schedule specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the adjustment for that operator. (f) The Manager, Western Aircraft Certification Office has found GTEC SB TPE331-73-0121 Revision 3, dated November 5, 1984, to be equivalent to GTEC SB TPE331-73-0121 Revision 2 dated April 18, 1984. This revision only adds the fuel pump assembly P/N. There are no changes in inspections or accomplishment instructions. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Garrett Turbine Engine Company, 111 South 34th St., P.O. Box 5217, Phoenix, Arizona 85010; telephone (602) 231-1000. This document also may be examined at FAA Rules Docket 83-ANE-29, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, Massachusetts 01803. This amendment supersedes Amendment 39-4840 (49 FR 13487), AD 84-07-08. Amendment 39-4867 became effective May 30, 1984. This Amendment 39-4964 becomes effective on December 26, 1984. ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E4WE](https://openairdocs.org/tcds/E4WE): Honeywell Aerospace US LLC; names 22 of 48 models: TPE331-10UGR, TPE331-10UG, TPE331-10UR, TPE331-6U, TPE331-6, TPE331-11UA, TPE331-3, TPE331-5… - [TCDS E2WE](https://openairdocs.org/tcds/E2WE): Honeywell Aerospace US LLC; names 20 of 27 models: TPE331-25DB, TPE331-43, TPE331-25FA, TPE331-47, TPE331-55, TPE331-25F, TPE331-47-B, TPE331-43-A… - [TCDS E3WE](https://openairdocs.org/tcds/E3WE): Honeywell Aerospace US LLC; names 6 of 6 models: TPE331-1UA, TPE331-2UA, TPE331-1U, TPE331-2U, TPE331-2, TPE331-1 ## 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: 662 (0 by airframe model, 662 by engine model) - Makers: Mitsubishi 109, Cessna 107, Fairchild 57, Ayres 53, Swearingen 53, Rockwell International 51, Construcciones Aeronauticas 25, Gulfstream AM Corp Comm Div 25, General Atomics Aero Systems 22, Beech 21 Models with the most aircraft: - [AiResearch TPE331 series](https://openairdocs.org/engine/airesearch-tpe331-series): 492 aircraft (engine model) - [Honeywell TPE331-SER series](https://openairdocs.org/engine/honeywell-tpe331-ser-series): 28 aircraft (engine model) - [Honeywell TPE331-10 series](https://openairdocs.org/engine/honeywell-tpe331-10-series): 17 aircraft (engine model) - [Honeywell TPE331-10](https://openairdocs.org/engine/honeywell-tpe331-10): 13 aircraft (engine model) - [Honeywell TPE331-10R](https://openairdocs.org/engine/honeywell-tpe331-10r): 13 aircraft (engine model) - [Garrett TPE331-11U](https://openairdocs.org/engine/garrett-tpe331-11u): 12 aircraft (engine model) - [Honeywell TPE331-11U](https://openairdocs.org/engine/honeywell-tpe331-11u): 8 aircraft (engine model) - [Garrett TPE331-5](https://openairdocs.org/engine/garrett-tpe331-5): 7 aircraft (engine model) - [Garrett TPE331-10](https://openairdocs.org/engine/garrett-tpe331-10): 7 aircraft (engine model) - [Garrett TPE331-10 series](https://openairdocs.org/engine/garrett-tpe331-10-series): 7 aircraft (engine model) - [Garrett TPE331-6](https://openairdocs.org/engine/garrett-tpe331-6): 6 aircraft (engine model) - [Garrett TPE331-1](https://openairdocs.org/engine/garrett-tpe331-1): 5 aircraft (engine model) - [Garrett TPE331-10R](https://openairdocs.org/engine/garrett-tpe331-10r): 5 aircraft (engine model) - [Honeywell TPE331-10U](https://openairdocs.org/engine/honeywell-tpe331-10u): 4 aircraft (engine model) - [AiResearch TPE331-1](https://openairdocs.org/engine/airesearch-tpe331-1): 3 aircraft (engine model) - [Garrett TPE331-2](https://openairdocs.org/engine/garrett-tpe331-2): 3 aircraft (engine model) - [Honeywell TPE331-2](https://openairdocs.org/engine/honeywell-tpe331-2): 3 aircraft (engine model) - [Honeywell TPE331-6](https://openairdocs.org/engine/honeywell-tpe331-6): 3 aircraft (engine model) - [AiResearch TPE331-2](https://openairdocs.org/engine/airesearch-tpe331-2): 2 aircraft (engine model) - [AiResearch TPE331-6](https://openairdocs.org/engine/airesearch-tpe331-6): 2 aircraft (engine model) All 37 models: https://openairdocs.org/ad/84-10-06-R1/models.md Every aircraft: https://openairdocs.org/ad/84-10-06-R1/aircraft.md 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.