Airworthiness directives › 2020-23-01
AD 2020-23-01 Airworthiness Directives; GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Turboprop Engines
Applicability*9
This AD applies to all GE Aviation Czech s.r.o. (GEAC) M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, M601F, H75-200, H80-100, H80-200, and H85-200 model turboprop engines, with a fuel control unit (FCU) part number (P/N) and serial number (S/N) listed in Appendix 1—Affected Parts of GE Aviation Czech Alert Service Bulletin (ASB) ASB-H75-73-00-00-0038 [01], ASB-H80-73-00-00-0074 [01], ASB-H85-73-00-00-0032 [01], ASB-M601D-73-00-00-0066 [01], ASB-M601E-73-00-00-0097 [01], ASB-M601F-73-00-00-0050 [01], and ASB-M601T-73-00-00-0040 [01] (single document; formatted as service bulletin identifier [revision number]), dated September 24, 2020 (the ASB), installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Before exceeding the applicable compliance time in Table 1 to paragraph (g) of this AD, remove the affected FCU and replace it with a part eligible for installation using the Accomplishment Instructions, paragraph 2, of the ASB. ER09NO20.003
Unsafe condition
This AD was prompted by incorrect installation by the manufacturer of one or more rubber cuff sealings of the cage reinforcement inside the main metering valve of the FCU, which reduces the cuff sealing's ability to properly seal the FCU working pressure. The FAA is issuing this AD to prevent the malfunction of the FCU, which could cause engine parameter oscillation or overshoots. The unsafe condition, if not addressed, could result in loss of engine thrust control and reduced control of the airplane.
Affected ADs
None.
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