# SAIB CE-19-01: Engine Oil and Airplane Hour Meter; Pressure Switch Failure - Type: Special airworthiness information bulletin (advisory, not mandatory) - Status: Historical - Revision: 0 - Issued: February 12, 2019 - Products: Textron 172R, 172S, 182S, 182T, 206H, T182T and T206H - Product type: Aircraft, Small Airplane - PDF: https://openairdocs.org/files/sha256/f8/1a/f81ac372935f6f471e0ff64ac02a1c08cfaed1556777b40f3cdc42b2bfedf180 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C5F305A38ABC51658625839F005F58FC.0001 - DRS record last changed: February 12, 2019 - Page: https://openairdocs.org/saib/CE-19-01 ## Text FAA Aviation Safety **SPECIAL AIRWORTHINESS** INFORMATION BULLETIN SUBJ: Engine Oil and Airplane Hour Meter; Pressure Switch Failure SAIB: CE-19-01 Date: February 12, 2019 This is information only. Recommendations aren’t mandatory. Introduction This Special Airworthiness Information Bulletin is to alert owners, operators, and maintenance technicians of Textron Aviation Inc. (Textron) Model 172R, 172S, 182S, 182T, T182T, 206H, T206H airplanes, of failure of the “Sensor-Oil Pressure (Hobbs Switch)”, part number (P/N) 83278 as it is referred to in the illustrated parts catalogue. These engine oil pressure switches could have been provided new with the airplane or as a spares replacement part. The FAA issued airworthiness directives (AD) in the past concerning these engine oil pressure switches for the above model airplanes. This engine oil pressure switch is currently the subject of AD 2013-11-11 which defines a life limit of 3000 hr. time in service (TIS). The existing AD remains in effect where applicable. However, the FAA is investigating recent events and may take additional AD action. The information and recommendations provided herein are intended to raise awareness of an issue that has a continued operational safety history, while our investigation continues. Background The above-referenced engine oil pressure switch is used to drive the following: • the red “OIL PRESS” warning annunciator on pre- Garmin G1000 airplanes, or • the red “OIL PRESSURE” annunciation on the primary flight display of G1000 airplanes, and • the airplane hour meter on all models above. NOTE: the oil pressure gauge/indicator is driven by a separate dedicated pressure transducer. The FAA is aware of seven events involving premature failure of this oil pressure switch, in which engine oil was found leaking from the pressure switch housing and/or found to have been pumped overboard, which can lead to obscuration of the windshield, limited forward visibility, loss of all engine oil and consequent engine failure. Recommendations The FAA recommends the following: a. Be aware of this failure, which may be difficult to detect until after the fact, and pass this information along to any other applicable owner/operator or technician. b. Investigate any oil residue found on the forward fuselage upper cowling deck and/or windshield for root cause and take corrective action prior to further flight. c. Inspect the oil pressure switch installation on the top rear or upper rear of the engine case, looking for: • Oil seepage or staining around the oil pressure switch mount location • Wet, moist or slippery oil pressure switch housing or wire leads • Tool marks on the housing or any other indications of over-torque at installation d. Take corrective action and replace any oil pressure switch found with any of the above conditions before further flight per the applicable model Textron maintenance manual. e. Replace oil pressure switch P/N 83278 at 1000 hours TIS on any engine, per the applicable model Textron maintenance manual until further investigation has been conducted. For Further Information, Contact Jeff Janusz, Sr. Aerospace Engineer, 1801 Airport Road, Wichita, KS 67209; phone: (316) 946-4148; fax: (316) 946-4107; e-mail: jeff.janusz@faa.gov. For Related Service Information Contact Textron Aviation, Inc. Textron Aviation Customer Service, One Cessna Blvd. Wichita, Kansas 67215; telephone (316) 517-5800; email: customercare@txtav.com internet www.txtav.com ## Registered aircraft it may concern (OpenAirDocs) Registry models matched by make and model, the same way as ADs, most registered aircraft first. - [Cessna 172S](https://openairdocs.org/model/cessna-172s): 1,915 registered aircraft (airframe model) - [Textron 172S](https://openairdocs.org/model/textron-172s): 1,239 registered aircraft (airframe model) - [Cessna 182T](https://openairdocs.org/model/cessna-182t): 969 registered aircraft (airframe model) - [Cessna T182T](https://openairdocs.org/model/cessna-t182t): 781 registered aircraft (airframe model) - [Cessna T206H](https://openairdocs.org/model/cessna-t206h): 691 registered aircraft (airframe model) - [Cessna 172R](https://openairdocs.org/model/cessna-172r): 683 registered aircraft (airframe model) - [Cessna 182S](https://openairdocs.org/model/cessna-182s): 606 registered aircraft (airframe model) - [Textron T206H](https://openairdocs.org/model/textron-t206h): 367 registered aircraft (airframe model) - [Textron 182T](https://openairdocs.org/model/textron-182t): 347 registered aircraft (airframe model) - [Cessna 206H](https://openairdocs.org/model/cessna-206h): 158 registered aircraft (airframe model) - [Textron T182T](https://openairdocs.org/model/textron-t182t): 96 registered aircraft (airframe model) --- 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.