Fuel Injector Nozzle

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FAA Aviation Safety SPECIAL AIRWORTHINESS INFORMATION BULLETIN SUBJ: Fuel Injector Nozzle SAIB: NE-15-21 Date: August 19, 2015 This is information only. Recommendations aren’t mandatory.

Introduction This Special Airworthiness Information Bulletin alerts you, owners, operators, repair stations, and flight standards district offices of a Wencor, LLC, parts manufacturer approval (PMA) supplements 2 and 62, fuel nozzle sheath, part number (P/N) 3119920-01WE, design issue that might impact engine performance and/ or proper installation of the fuel nozzle sheath. Fuel nozzle sheath, P/N 3119920-01WE, replaces original equipment manufacturer (OEM) fuel nozzle sheath, P/N 3119920-01. At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness directive action under Title 14 of the Code of Federal Regulations (14 CFR) part 39. Background While developing the fuel nozzle sheath, P/N 3119920-01WE, Wencor made the lower portion of the cap thicker than the OEM fuel nozzle sheath, P/N 3119920-01. A technician installing the PMA fuel nozzle sheath, P/N 3119920-01WE, on a PT-6A engine found he/she could not install the part (Figure 1), without it contacting the fuel nozzle (Figure 2) because the fuel nozzle was contacting the sheath.

Figure 1 – Fuel Nozzle Sheath

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Figure 2 – Fuel Nozzle inside Cutaway Sheath

A fuel nozzle that is bottomed out in the fuel nozzle sheath might affect the performance, temperature, or integrity of the engine in service. There have been no reports of operational issues to date, but since the fuel nozzle sheaths do not fit with the fuel nozzles as designed, and the effect of this condition is unknown, the FAA recommends removing all Wencor PMA fuel nozzle sheaths, P/N 3119920-01WE, from service. Recommendations 1. The FAA recommends removing all Wencor PMA fuel nozzle sheaths, P/N 3119920-01WE, from service at the earliest maintenance opportunity not to exceed 600 flight-hours after August 1, 2015. 2. The FAA also recommends that all spare Wencor PMA fuel nozzle sheaths, P/N 3119920- 01WE, be removed from inventory and not installed in any engine. 3. In addition, the FAA recommends that all removed fuel nozzle sheaths and spares be returned to Wencor. Table 1 – Operators/ Repair Stations Using Fuel Nozzle Sheath, P/N 3119920-01WE

Operator/ Repair Station Country Quantity Purchased Great Lakes Aviation USA 77 Prime Turbines (Massachusetts) USA 2 Prime Turbines (Texas) USA 4 Moze Havaclik Savunma Sist. Turkey 100 R.T. Turbines, Inc USA 5 Division Turbos, SRL Argentina 4

Cutaway fuel nozzle sheath Areas of contact Fuel nozzle Lower portion of cap

3 Table 2 – U.S. Type Certified Engine Models Affected with Fuel Nozzle Sheath, P/N 3119920-01WE

Engine/Model TCDS No. PT6A-38 E4EA PT6A-41 E4EA PT6A-42 E4EA PT6A-42A E4EA PT6A-45A E4EA PT6A-45B E4EA PT6A-45R E4EA PT6A-50 E4EA PT6A-60A E4EA PT6A-60AG E4EA PT6A-61 E4EA PT6A-64 E26NE PT6A-65B E4EA PT6A-65R E4EA PT6A-65AR E4EA PT6A-65AG E4EA PT6A-67B E26NE PT6A-67D E26NE

For Further Information Contact Matthew Bryant, Aerospace Engineer, Denver Aircraft Certification Office, 26805 East 68th Avenue, Room 214, Denver, CO 80249; phone: 303-342-1092; fax: 303-342-1088; email: [email protected].

For Related Service and Warranty Information Contact Wencor Engineering; phone: 801-491-2543; email: [email protected]; or Wencor Sales; phone: 801-489-2000; or email: [email protected].