EMERGENCY AIRWOTHNESS DIRECTIVE
EMERGENCY AIRWOTHNESS DIRECTIVE
DATE: May 14, 2012
AD #: 2012-10-52
Emergency airworthiness directive (AD) 2012-10-52 is sent to owners and operators of
Cessna 206, 207, and 210 airplanes with Hartzell Engine Technologies (HET) turbochargers, part
numbers (P/Ns) 406610-0005 and 406610-9005, installed.
This emergency AD was prompted by a report of an HET turbocharger causing an engine inflight
power rollback. Upon investigation, the turbocharger was found to have incorrectly located oil
passages in the center housing, causing insufficient oil flow to the bearings. This condition, if not
corrected, could result in turbocharger bearing seizure, failure of the turbocharger turbine shaft or
wheel, and damage to the airplane.
Relevant Service Information
We reviewed Hartzell Engine Technologies Alert Service Bulletin (ASB) No. 047, dated May
8, 2012. The ASB indentifies the part numbers and serial numbers of affected turbochargers and
describes procedures for removing them from service.
We are issuing this AD because we evaluated all the relevant information and determined the
unsafe condition described previously is likely to exist or develop in other turbochargers of the same
design. We are evaluating whether the affected population needs to expand to include supplemental
type certificate and parts manufacturer approval installations and may take further action.
This AD requires removing the affected turbochargers from service before further flight.
Authority for this Rulemaking
Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation
safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII,
Aviation Programs, describes in more detail the scope of the Agency’s authority.
We are issuing this rulemaking under the authority described in Subtitle VII, Part A,
Subpart III, Section 44701, “General requirements.” Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices,
methods, and procedures the Administrator finds necessary for safety in air commerce. This
regulation is within the scope of that authority because it addresses an unsafe condition that is likely
to exist or develop on products identified in this rulemaking action.
Presentation of the Actual AD
We are issuing this AD under 49 U.S.C. Section 44701 according to the authority delegated to
me by the Administrator.
2012-10-52 Hartzell Engine Technologies: Directorate Identifier 2012-NE-16-AD
(a) Effective Date
This Emergency AD is effective upon receipt.
(b) Affected ADs
This emergency AD applies to the following Hartzell Engine Technologies (HET)
(1) Turbocharger HET P/N 406610-0005 or P/N 406610-9005 with serial numbers listed in
Table 1 of HET Alert Service Bulletin No. 047, dated May 8, 2012.
(2) Turbochargers with P/N 406610-0005 or P/N 406610-9005 overhauled or repaired on or
later than January 1, 2012, with the same turbocharger center housing P/N and date code H-0112.
(3) Turbocharger center housings P/N 409836-0005 sold as piece parts which are in
field/distributor inventory with date code H-0112.
These turbochargers are installed on, but not limited to, Cessna 206, 207, and 210 airplanes
with Continental Motors, Inc TSIO-520-C, -G, -H, -M, and –R reciprocating engines installed.
(d) Unsafe Condition
This AD was prompted by a report of an HET turbocharger causing an engine in-flight power
rollback. Upon investigation, the turbocharger was found to have incorrectly located oil passages in
the center housing, causing insufficient oil flow to the bearings. This condition, if not corrected,
could result in turbocharger bearing seizure, failure of the turbocharger turbine shaft or wheel, and
damage to the airplane. We are issuing this AD to prevent turbocharger bearing seizure, failed
turbocharger components, and damage to the airplane.
Before further flight, remove from service the turbochargers identified in paragraph (c) of this
emergency AD, unless already done.
(f) Special Flight Permit
Special flight permits are prohibited.
(g) Alternative Methods of Compliance (AMOCs)
The Manager, Chicago Aircraft Certification Office, FAA, may approve AMOCs for this AD.
Use the procedures found in 14 CFR 39.19 to make your request.
(h) Related Information
(1) For further information about this AD, contact: Christopher Richards, Aerospace
Engineer, Chicago Aircraft Certification Office, FAA, 2300 E. Devon Ave., Des Plaines, IL 60018;
(2) For copies of the service information referenced in this AD, contact: Hartzell Engine
Technologies, LLC, 2900 Selma Highway, Montgomery, AL 36108, phone: 334-386-5400; fax: 334-
386-5450; internet: http://www.hartzellenginetech.com/servi … ml#turbos.
(3) You may review copies of the referenced service information at the FAA, Engine &
Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the
availability of this material at the FAA, call 781-238-7125.
Issued in Burlington, Massachusetts, on May 14, 2012.
Peter A. White,
Manager, Engine & Propeller Direct
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