Airworthiness directives › 2004-18-01
AD 2004-18-01 Airworthiness Directives; Hoffmann Propeller GmbH & Co KG Models HO-V343 and HO-V343K Propellers
Applicability*9
This AD applies to Hoffmann Propeller GmbH & Co KG (Hoffmann Propeller) models HO-V343 and HO-V343K propellers. These propellers are installed on, but not limited to, general aviation airplanes possibly having an FAA-approved Supplemental Type Certificate.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Propellers With Hubs Having 1,200 or More Flight Hours-Since-New (FHSN) (f) For propellers having hubs with 1,200 or more FHSN, do the following: (1) Before each flight after the effective date of this AD, perform a preflight check for blade shake. Use paragraph 2.2 of Accomplishment Instructions of Hoffmann Propeller Service Instruction (SI) No. 61-10-05 SI E 4B, dated July 13, 2004, to do this check. If you find any blade shake, do the following before further flight: (i) Record the blade shake, blade nut preload, and final blade nut torque of all three blades. Use paragraph 2.2 of Accomplishment Instructions of Hoffmann Propeller Service Instruction (SI) No. 61-10-05 SI E 4B, dated July 13, 2004, to do these recordings and checks. (ii) Remove propeller blades from the hub. Information on blade removal can be found in Hoffmann Propeller Overhaul Manual No. (E)661. (iii) Perform an eddy current inspection (ECI) of the propeller hub for damage and cracks. Use paragraphs 2.3 through 2.4 of Accomplishment Instructions of Hoffmann Propeller SI No. 61-10-05 SI E 4B, dated July 13, 2004, to do the ECI. (iv) If the propeller hub has damage or cracks, remove the propeller hub from service before further flight. (2) Perform repetitive checks and inspections as specified in paragraphs (f)(1)(i) through (f)(1)(iv) of this AD within intervals of 100 flight hours-since-last-inspection. Propellers With Hubs Having Fewer Than 1,200 FHSN (g) For propellers with hubs having fewer than 1,200 FHSN, do the following: (1) Before each flight after the effective date of this AD, perform a preflight check for blade shake, as specified in paragraph (f)(1) of this AD. If blade shake is found, perform the follow-up actions specified in paragraphs (f)(1)(i) through (f)(1)(iv) of this AD. (2) Perform an ECI of the propeller hub for damage and cracks before exceeding 1,200 FHSN. Use paragraphs 2.3 through 2.4 of Accomplishment Instructions of Hoffmann Propeller SI No. 61-10-05 SI E 4B, dated July 13, 2004, to do the ECI. Alternative Methods of
Unsafe condition
This AD results from a report of a blade separating from either a model HO-V343 or HO-V343K propeller. We are issuing this AD to prevent propeller hub failure and blade separation due to an unknown root cause, leading to damage and possible loss of control of the airplane.
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