# AD 71-05-07: High Speed Pinion Assembly - Type: Airworthiness directive - Status: Current - Products: Honeywell International TPE331-1, TPE331-1U, TPE331-1UA, TPE331-2, TPE331-25A, TPE331-25AA, TPE331-25AB, TPE331-25B, TPE331-25C, TPE331-25D, TPE331-25DA, TPE331-25DB and 21 more - Effective: April 8, 1972 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-1430 - Registered aircraft: 538 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FBF7136F5AFF06E486256E01005AD0C9.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/71-05-07 ## The airworthiness directive 71-05-07 AIRESEARCH: Amdt. 39-1166 as amended by Amendment 39-1180 and 39-1277 is further amended by Amendment 39-1430. The AiResearch Manufacturing Company of Arizona. Applies to Turbopropeller Engines Model TPE331-1, -2, -25, -29, -43, -45, -47, -49, -51, -55, -57, -61 and -71 installed in, but not limited to the Mitsubishi MU-2, Swearingen Merlin 2B, Volpar Turboliner and Short Skyvan Aircraft. Compliance required as indicated. To prevent possible failure of the high speed pinion assembly, accomplish the following: (a) Within 50 hours time in service after the effective date of this amendment to AD 71-05-07, as amended, unless already accomplished, and at intervals not to exceed 50 hours time in service thereafter, perform a visual inspection of the engine oil filter per AiResearch Service Bulletin 628, Revision 2, dated March 23, 1972, or later FAA-approved revision, or an equivalent inspection approved by the Chief, Aircraft Engineering Division, FAA Western Region. Return a sample of engine oil and the used engine oil filter element after each inspection to AiResearch for laboratory examination in accordance with AiResearch Service Bulletin 628, Revision 2, dated March 23, 1972, or later FAA-approved revision. Use of other laboratory facilities requires the approval of the Chief, Aircraft Engineering Division, FAA Western Region. Operators must submit substantiating data to obtain this approval. (1) If excessive oil contamination in the filter is found during the visual inspection required in (a) above, the cause must be determined and corrected before further flight. (2) Prior to operation of the engine in excess of 50 hours time in service since the inspection prescribed in (a) above, the owner or operator must receive written confirmation of the results from AiResearch, or another approved facility. (b) Within 50 hours' time in service after the effective date of this AD, unless already accomplished, revise the normal procedures section of the applicable FAA approved Airplane Flight Manuals for aircraft equipped with AiResearch Model TPE331-1, -2, -25, -29, -43, -45, -47, -49, -51, -55, -57, -61, and -71 series engines to include a cautionary note to read as follows: "If sudden loss or significant fluctuation of torque pressure indication occurs, the engine should be promptly shut down and the cause determined before further operation." (c) After the effective date of this amendment to AD 71-05-07, as amended, unless previously accomplished, incorporate, at the next engine overhaul, the improved high speed pinion and thrust washer assembly per AiResearch Service Bulletin 632, Revision 1, dated March 23, 1972, or Service Bulletin 659, Revision 1, dated March 23, 1972, or later FAA-approved revision(s), or an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. Upon completion of this modification the inspections of (a) above may be discontinued, and the AFM revision required by (b), above, may be deleted. Amendment 39-1166 became effective on March 9, 1971. Amendment 39-1180 became effective on April 6, 1971. Amendment 39-1277 became effective on September 2, 1971. This Amendment 39-1430 becomes effective on April 8, 1972. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E2WE](https://openairdocs.org/tcds/E2WE): Honeywell Aerospace US LLC; names 27 of 27 models: TPE331-25DB, TPE331-57-B, TPE331-43, TPE331-25FA, TPE331-61-A, TPE331-47, TPE331-55, TPE331-51… - [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: 538 (0 by airframe model, 538 by engine model) - Makers: Cessna 104, Mitsubishi 103, Ayres 52, Rockwell International 47, Swearingen 40, Fairchild 39, Gulfstream AM Corp Comm Div 21, Short Bros. & Harland 16, Aero Commander 15, Beech 14 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) - [Garrett TPE331-1](https://openairdocs.org/engine/garrett-tpe331-1): 5 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) - [AiResearch TPE331-2](https://openairdocs.org/engine/airesearch-tpe331-2): 2 aircraft (engine model) - [Honeywell TPE331-51](https://openairdocs.org/engine/honeywell-tpe331-51): 1 aircraft (engine model) - [Honeywell TPE331-1](https://openairdocs.org/engine/honeywell-tpe331-1): 1 aircraft (engine model) All 10 models: https://openairdocs.org/ad/71-05-07/models.md Every aircraft: https://openairdocs.org/ad/71-05-07/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.