Airworthiness directives › 2021-15-10
AD 2021-15-10 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 GE Aviation Czech s.r.o. (GEAC) (Type Certificate previously held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) H75-200, H80-100, and H80-200 model turboprop engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 100 flight hours (FHs) after the effective date of this AD, and thereafter at intervals not to exceed 100 FHs since the previous inspection, perform a functional inspection of the FCU, P/N LUN 6590.07-8, using the Accomplishment Instructions, paragraph 2.1.1, Ground Check Procedure, of GE Aviation Czech Alert Service Bulletin No. ASB-H80-73-00-00-0052[00]/ASB-H75-73-00-00-0022[00] (single document), Revision 00, dated February 6, 2020 (the ASB). (2) If, during any functional inspection required by paragraph (g)(1) of this AD, the engine Ng is: (i) Equal to or greater than 57% up to and including 60%, then no further action is required. (ii) Equal to or greater than 55% but lower than 57%, then follow the steps 1 through 3 under “Ng speed is equal to or above 55% and below 57%” in the Accomplishment Instructions, paragraph 2.1.2, Ground check results evaluation, of the ASB. (iii) Below 55%, then follow steps 1 and 2 under “Ng speed is below 55%” in the Accomplishment Instructions, paragraph 2.1.2, Ground check results evaluation, of the ASB. Note 1 to paragraph (g)(2): In the Accomplishment Instructions, paragraph 2.1.2, of the ASB, where the ASB states “Do steps 1 thru 8 after the FCU adjustment,” do steps 1 through 7 of the Accomplishment Instructions, paragraph 2.1.1, in the ASB. (3) During the next engine overhaul, or within 44 months, whichever occurs first after the effective date of this AD, remove the FCU, P/N LUN 6590.07-8, and replace it with a part eligible for installation.
Unsafe condition
This AD was prompted by several reports of engine gas generator speed (Ng) rollbacks below idle on GEAC H75-200, H80-100, and H80-200 model turboprop engines with a fuel control unit (FCU), part number (P/N) LUN 6590.07-8, installed. The FAA is issuing this AD to prevent engine Ng rollbacks below idle on engines equipped with an FCU, P/N LUN 6590.07-8. The unsafe condition, if not addressed, could result in loss of engine power and loss of control of the airplane.
Affected ADs
None.
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