Aircraft
Certification Service Washington, DC U.S. Department of Transportation Federal Aviation Administration
AIR-21-01
January 4, 2021
This is information only. Recommendations
aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin (SAIB) is written to
inform the public about an approved alternative method of compliance
(AMOC) to an airworthiness directive (AD) and how to obtain a copy of
the Textron Aviation (McCauley Propeller Systems) global AMOC (aka;
AMOC of general applicability) for AD 2020-19-06.
Background
AD 2020-19-06 requires the installation of a governor eligible for
installation. Certain McCauley governors were delivered with an
unapproved variant idler gear bearing installed. Additional unapproved
variant idler gear bearings and gear assemblies and overhaul kits with
the unapproved variant bearing were shipped to the field. This
unapproved variant idler gear bearing did not meet McCauley drawing
specifications.
It has come to our attention of questions from the field regarding how
to determine if a governor is eligible for installation. Per AD
2020-19-06, a governor eligible for installation is defined as a
governor that does not have an idler gear bearing with a part marking
“BA 59” installed.
The global AMOC allows the use of additional documentation of the
completion of the Accomplishment Instructions of McCauley Alert Service
Bulletins (ASB) ASB273, ASB273A, ASB273B, or ASB273C in determining if
a governor is eligible for installation. This global AMOC also
addresses criteria, which can be used to determine the eligibility of
new governors after serial number 180501.
Recommendations
It is our recommendation and the intent of this SAIB to allow the use
of the attached Textron Aviation (McCauley Propeller Systems) AMOC for
AD 2020-19-06, dated November 4, 2020, to facilitate your compliance
with AD 2020-19-06.
For Further Information Contact
Thomas Teplik, Aviation Safety Engineer, 1801 Airport Road, Rm. 100,
Wichita, KS 67209; phone: (316) 946-4196; fax: (316) 946-4107; e-mail:
thomas.teplik@faa.gov.
For Related Service Information Contact