| SPECIAL
AIRWORTHINESS INFORMATION BULLETIN |
Aircraft
Certification Service
Washington, DC
U.S. Department of Transportation
Federal Aviation Administration |
| NE-15-21 |
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.
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
- 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.
- 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.
- 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 |
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: Matthew.Bryant@faa.gov.
For Related Service and Warranty Information Contact
Wencor Engineering; phone: 801-491-2543; email: jbies@wencor.com; or
Wencor Sales; phone: 801-489-2000; or email: sales@wencor.com.
