Airworthiness directives › 2020-19-06
AD 2020-19-06 Airworthiness Directives; McCauley Propeller Systems
Makes named: mccauley. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the McCauley Propeller Systems (McCauley) governors specified in paragraph (c)(1) or (2) of this AD and installed on airplanes, certificated in any category. (1) Models listed in table 2 of McCauley Alert Service Bulletin No. ASB273C, dated January 30, 2019 (McCauley ASB273C) with a serial number from 170061 through 180501, excluding the serial numbers listed in table 1 of McCauley ASB273C; or (2) Models listed in table 2 of McCauley ASB273C, with any serial number, that have an installation date after January 31, 2017, or an installation date that cannot be determined.
Compliance
Unless already done, within 50 hours time-in-service after the effective date of this AD or within 24 months after the effective date of this AD, whichever occurs first, replace the governor with a governor eligible for installation. Note 1 to paragraph (f) of this AD: Any model McCauley governor that is stamped with the letter B, as specified in the Accomplishment Instructions in McCauley ASB273C, has already complied with the requirements of this AD.
Required actions
For the purposes of this AD, 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.
Unsafe condition
This AD was prompted by reports of an unapproved variant idler gear bearing, McCauley part number (P/N) A-20028, installed on governors. All models of McCauley governors have a bearing with P/N A-20028 installed; however, the unapproved variant can be identified with the part marking “BA 59.” The FAA is issuing this AD to prevent failure of the idler gear bearing. This failure could result in failure of the governor, loss of propeller pitch control, engine and propeller over speed, engine oil contamination, and loss of control of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1