# AD 87-26-08: Crankshaft and Piston Pins - Type: Airworthiness directive - Status: Current - Products: Continental Motors TSIO-520-BE and TSIO-520-CE - Effective: April 29, 1988 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-5883 - Registered aircraft: 4,125 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/21A5FB48C98F9E038625684100557C4E.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/87-26-08 ## The airworthiness directive 87-26-08 TELEDYNE CONTINENTAL MOTORS (TCM): Amendment 39-5883. Applies to TSIO- 520BE and CE engines. Compliance is required as indicated, unless already accomplished. To prevent possible failure of the crankshaft and piston pins, accomplish the following: (a) Thru-bolt torque check: (1) For TSIO-520BE engines, before further flight, accomplish in accordance with paragraph I of TCM Service Bulletin (SB) M87-25, dated December 15, 1987. (2) For TSIO-520CE engines, within the next 25 hours of operation, accomplish in accordance with paragraph I of TCM SB M87-26, dated December 21, 1987. (3) If the force required to rotate the propeller per paragraph IA of either SB is not within the normal 10 to 20 pounds, or the crankshaft has no end play, the engine must be removed from service. (4) If after torqueing the thru-bolts per paragraph IC of either SB, the force required to rotate the propeller has increased above the previously recorded value by more than 3 pounds, or the crankshaft has no end play, the engine must be removed from service. (b) Piston pin replacement and crankshaft bearing inspection: (1) For TSIO-520BE engines, before further flight, accomplish in accordance with paragraph II of TCM SB M87-25, dated December 15, 1987. (2) For TSIO-520CE engines, within the next 25 hours of operation, accomplish in accordance with paragraph II of TCM SB M87-26, dated December 21, 1987. (3) If there is evidence that the bearing has shifted per figure B of either SB, the engine must be removed from service. (c) Final thru-bolt torque check and reassembly of engine: (1) For TSIO-520BE engines, before further flight, accomplish in accordance with paragraph III of TCM SB M87-25, dated December 15, 1987. (2) For TSIO-520CE engines, within the next 25 hours of operation, accomplish in accordance with paragraph III of TCM SB M87-26, dated December 21, 1987. (3) If the force required to rotate the propeller per paragraphIIIA of either SB has increased above the value recorded in paragraph (a)(4) of this AD, or the crankshaft has no end play, the engine must be removed form service. (d) For TSIO-520CE engines only, before further flight, fabricate and install on the aircraft instrument panel, as near as possible to the manifold pressure gage and in clear view of the pilot, the following placard using letters at least 0.10 inch high: "Take-off - No change in Manifold Absolute Pressure (MAP) Climb - MAP 31 inches mercury or less Cruise - MAP 25 inches mercury or less" (1) Place a copy of this AD in the pilots' operating handbook. (2) Operate the aircraft in accordance with these power limitations. (3) Placard and restrictions may be removed when the requirements of paragraph a(2), b(2), and c(2) of this AD have been accomplished, or upon installation of a serviceable engine. (e) Make appropriate log book entry showing compliance with this AD. (f) Aircraft may be ferried inaccordance with the provisions of Federal Aviation Regulations (FAR) 21.197 and 21.199 to a base where the AD can be accomplished. (g) Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Atlanta Aircraft Certification Office, Federal Aviation Administration, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349. (h) Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Manager, Atlanta Aircraft Certification Office, Federal Aviation Administration, Central Region, may adjust the compliance times specified in this AD. TCM Mandatory Service Bulletin M87-25, dated December 15, 1987, and TCM Mandatory Service Bulletin M87-26, dated December 21, 1987, identified and described in this document are incorporated herein and made a part thereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Teledyne Continental Motors, P.O. Box 90, Mobile, Alabama 36601. These documents may also be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Room 311, Docket No. 87-ANE-62, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday, except federal holidays. This amendment 39-5883 becomes effective April 29, 1988, as to all persons except those persons to whom it was made immediately effective by individual priority letter, 87-26-08 issued December 23, 1987, which contained this amendment. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E8CE](https://openairdocs.org/tcds/E8CE): Continental Aerospace Technologies, Inc.; names 2 of 31 models: TSIO-520-BE, TSIO-520-CE ## 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: 4,125 (0 by airframe model, 4,125 by engine model) - Makers: Cessna 3,182, Beech 672, Piper 182, Raytheon 61, Mooney 11, Meyers Industries 2, Navion 2, Ryan 2, Aero Commander 1, Cirrus Design 1 Models with the most aircraft: - [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series): 4,064 aircraft (engine model) - [TCM Cont TSIO-520 series](https://openairdocs.org/engine/tcm-cont-tsio-520-series): 49 aircraft (engine model) - [Continental TSIO-520-BE](https://openairdocs.org/engine/continental-tsio-520-be): 9 aircraft (engine model) - [Continental TSIO-520-CE](https://openairdocs.org/engine/continental-tsio-520-ce): 3 aircraft (engine model) All 4 models: https://openairdocs.org/ad/87-26-08/models.md Every aircraft: https://openairdocs.org/ad/87-26-08/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.