# SAIB NE-13-31: Turbine Engine Oil System Scavenge Oil Tube Coking and Proper Cleaning at Overhaul - Type: Special airworthiness information bulletin (advisory, not mandatory) - Status: Current - Revision: 0 - Issued: May 9, 2013 - Products: Pratt & Whitney Division PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4074, PW4074D, PW4077, PW4077D and 25 more - Product type: Engine - PDF: https://openairdocs.org/files/sha256/2d/84/2d84a0f6430b55ddabe8234e07b4d2d5579d04032cbf1b7cf926591d62843a86 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AFC2FE06623E3CFD86257B660054914E.0001 - DRS record last changed: May 9, 2013 - Page: https://openairdocs.org/saib/NE-13-31 ## Text FAA Aviation Safety **SPECIAL AIRWORTHINESS** INFORMATION BULLETIN SUBJ: Turbine Engine Oil System – Scavenge Oil Tube Coking and Proper Cleaning at Overhaul SAIB: NE-13-31 Date: May 9, 2013 This is information only. Recommendations aren’t mandatory. Introduction This Special Airworthiness Information Bulletin (SAIB) alerts you, owners, operators, and certified repair facilities of airplanes equipped with Pratt & Whitney Division (P&W) PW4000 series turbofan engines to potential reduced oil flow in the No. 4 bearing compartment due to oil nozzle blockage. The airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39. Background We have received reports of blockage of the No. 4 bearing oil nozzle on PW4000-100 and PW4000-94 model engines resulting in reduced oil flow, No. 4 bearing distress and internal engine fire. In one case, the reduction in oil flow led to a low pressure turbine (LPT) shaft fracture. These events are suspected to be caused by incomplete cleaning of the oil supply tube for the No. 4 bearing. These engines are installed on, but not limited to, Airbus A300, A310, and A330, Boeing 747-400, 767, and 777, and McDonnell Douglas MD-11 airplanes. This SAIB provides information to operators on oil nozzle blockage and lists service information intended to prevent further occurrences of incomplete cleaning and possible engine failure. Current cleaning instructions require the removal of all varnish and coke contamination from tubes and nozzles. Additionally, P&W recently issued a revision to the Cleaning, Inspection and Repair (CIR) manual to specify a borescope inspection to verify the thoroughness of the cleaning operation when the No. 4 bearing oil tubes and nozzles are removed from the engine. For service information related to cleaning and inspection of the No. 4 bearing oil tubes and nozzles, refer to the following: • Pratt & Whitney CIR Manual part number (P/N) 51A357 ATA Sections: 72-54-00 Turbine Exhaust Case, 72-54-07 Pressure Tube, 72-54-08 Scavenge Tube Outer, 72-54-09 Scavenge Tube Inner, 72-54-10 Oil Nozzle, 72-54-19 Transfer Tube, 72-54-20 Damper Supply Tube, 72-54-21 Front Nozzle Recommendations We recommend that a thorough cleaning and borescope inspection be performed on all oil supply and scavenge tubes and nozzles to remove all coke build-up. Guidance may be found in the manual listed above. For Further Information Contact Robert Morlath, Aerospace Engineer, FAA Engine Certification Office, ANE-142, 12 New England Executive Park, Burlington, Massachusetts, 08103; phone: (781) 238-7154; fax: (781) 238-7199; email: robert.c.morlath@faa.gov 2 For Related Service Information Contact Pratt and Whitney Division, United Technologies Corporation, 400 Main St East Hartford, Connecticut, 06108; phone: (860) 565-0140; email help24@pw.utc.com ## Registered aircraft it may concern (OpenAirDocs) Registry models matched by make and model, the same way as ADs, most registered aircraft first. - [Pratt & Whitney PW4158](https://openairdocs.org/engine/pratt-whitney-pw4158): 65 registered aircraft (engine model) - [Pratt & Whitney PW4056](https://openairdocs.org/engine/pratt-whitney-pw4056): 25 registered aircraft (engine model) - [Pratt & Whitney PW4060](https://openairdocs.org/engine/pratt-whitney-pw4060): 14 registered aircraft (engine model) - [Pratt & Whitney PW4168A](https://openairdocs.org/engine/pratt-whitney-pw4168a): 12 registered aircraft (engine model) - [Pratt & Whitney PW4460](https://openairdocs.org/engine/pratt-whitney-pw4460): 10 registered aircraft (engine model) - [Pratt & Whitney PW4462](https://openairdocs.org/engine/pratt-whitney-pw4462): 8 registered aircraft (engine model) - [Pratt & Whitney PW4062](https://openairdocs.org/engine/pratt-whitney-pw4062): 6 registered aircraft (engine model) - [Pratt & Whitney PW4062A](https://openairdocs.org/engine/pratt-whitney-pw4062a): 2 registered aircraft (engine model) - [Pratt & Whitney PW4090](https://openairdocs.org/engine/pratt-whitney-pw4090): 2 registered aircraft (engine model) - [Pratt & Whitney PW4052](https://openairdocs.org/engine/pratt-whitney-pw4052): 1 registered aircraft (engine model) - [Pratt & Whitney PW4050](https://openairdocs.org/engine/pratt-whitney-pw4050): 0 registered aircraft (engine model) - [Pratt & Whitney PW4060A](https://openairdocs.org/engine/pratt-whitney-pw4060a): 0 registered aircraft (engine model) - [Pratt & Whitney PW4060C](https://openairdocs.org/engine/pratt-whitney-pw4060c): 0 registered aircraft (engine model) - [Pratt & Whitney PW4074](https://openairdocs.org/engine/pratt-whitney-pw4074): 0 registered aircraft (engine model) - [Pratt & Whitney PW4074D](https://openairdocs.org/engine/pratt-whitney-pw4074d): 0 registered aircraft (engine model) - [Pratt & Whitney PW4077](https://openairdocs.org/engine/pratt-whitney-pw4077): 0 registered aircraft (engine model) - [Pratt & Whitney PW4077D](https://openairdocs.org/engine/pratt-whitney-pw4077d): 0 registered aircraft (engine model) - [Pratt & Whitney PW4084](https://openairdocs.org/engine/pratt-whitney-pw4084): 0 registered aircraft (engine model) - [Pratt & Whitney PW4084D](https://openairdocs.org/engine/pratt-whitney-pw4084d): 0 registered aircraft (engine model) - [Pratt & Whitney PW4090-3](https://openairdocs.org/engine/pratt-whitney-pw4090-3): 0 registered aircraft (engine model) - [Pratt & Whitney PW4090D](https://openairdocs.org/engine/pratt-whitney-pw4090d): 0 registered aircraft (engine model) - [Pratt & Whitney PW4098](https://openairdocs.org/engine/pratt-whitney-pw4098): 0 registered aircraft (engine model) - [Pratt & Whitney PW4152](https://openairdocs.org/engine/pratt-whitney-pw4152): 0 registered aircraft (engine model) - [Pratt & Whitney PW4156](https://openairdocs.org/engine/pratt-whitney-pw4156): 0 registered aircraft (engine model) - [Pratt & Whitney PW4156A](https://openairdocs.org/engine/pratt-whitney-pw4156a): 0 registered aircraft (engine model) - [Pratt & Whitney PW4160](https://openairdocs.org/engine/pratt-whitney-pw4160): 0 registered aircraft (engine model) - [Pratt & Whitney PW4164](https://openairdocs.org/engine/pratt-whitney-pw4164): 0 registered aircraft (engine model) - [Pratt & Whitney PW4168](https://openairdocs.org/engine/pratt-whitney-pw4168): 0 registered aircraft (engine model) - [Pratt & Whitney PW4650](https://openairdocs.org/engine/pratt-whitney-pw4650): 0 registered aircraft (engine 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.