Aircraft
Certification Service Washington, DC U.S. Department of Transportation Federal Aviation Administration
NE-09-31
May 27, 2009
This is information only. Recommendations
aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin (SAIB) alerts you,
owners and operators of Hawker Beechcraft Corporation Model 60, 60A and
60B (Duke), equipped with a Lycoming TIO-541-E1C4 engine, of a
potential discrepancy with a rebuilt Kelly Aerospace Energy Systems
(KAES) T1879 model turbocharger, part number, 407540-9003; serial
number, JAR00401A. This rebuilt turbocharger was shipped from KAES to
Aviall (a distributor) on December 19, 2006. At this time, the
airworthiness concern is not an unsafe condition that would warrant an
airworthiness directive (AD) action under Title 14 of the Code of
Federal Aviation Regulations (14 CFR) part 39.
Background
Incoming inspections of new KAES turbocharger backplates by a
distributor revealed a production run of backplates that were machined
without an oil galley, adjacent to a thrust bearing. All affected
backplates which were individually distributed have been located and
all but one turbocharger assembled with an affected backplate has been
located. While the FAA is unaware of any safety related issues with the
turbocharger in question, functional and durability issues with the
assembly might exist. These issues include, but are not limited to, the
inability to achieve rated critical altitude or engine performance,
inability to achieve reliable and repeatable manifold pressure
settings, sluggish and or unstable turbocharger operation, and the
inability to meet expected component life.
Recommendations
We recommend that owners and operators of Hawker Beechcraft
Corporation Model 60, 60A and 60B (Duke), equipped with a Lycoming
TIO-541-E1C4 engine determine if turbocharger, part number,
407540-9003; serial number, JAR00401A, is installed. If the subject
turbocharger is installed, we recommend that the turbocharger be
replaced as soon as possible with a serviceable assembly.
For Further Information Contact
Gary Wechsler, Aerospace Engineer, FAA, Atlanta Aircraft
Certification Office, One Crown Center, 1895 Phoenix Boulevard, Suite
450, Atlanta, GA 30349; telephone (770) 703-6086; fax (770) 703-6055;
e-mail: gary.wechsler@faa.gov.
For Related Service Information Contact
Kelly Aerospace Energy Systems, LLC; 2900 Selma Hwy, Montgomery, AL 36108; telephone (877) 359-5355 or (334) 386-5400.