Airworthiness Directive · Amendment 39-15315 · MT-Propeller Entwicklung GmbH Propellers
MT-Propeller Entwicklung GmbH Propellers
This AD applies to MT-Propeller Entwicklung GmbH, models MT, MTV-1, MTV-3, MTV-5, MTV-6, MTV-7, MTV-9, MTV-11, MTV-12, MTV-14, MTV-15, MTV-18, and MTV-21 propellers manufactured before 1995, which have not been overhauled since April 1994. These propellers may be installed on, but not limited to, Apex ATL, Apex DR400, EADS Socata Rallye, Extra EA-300, Piper PA-46, Rene Fournier RF4, Sukhoi SU-26, SU-29, and SU-31; Yakovlev YAK-52, YAK-54, and YAK-55; and Technoavia SM-92 airplanes.
The FAA is superseding an existing airworthiness directive (AD) for certain MT-Propeller Entwicklung GmbH variable pitch and fixed pitch propellers manufactured before 1995, which had not been overhauled since April 1994. That AD currently requires overhauling the propeller blades and performing initial and repetitive visual inspections of affected propeller blades. That AD also requires removing all propeller blades from service with damaged erosion sheath bonding or loose erosion sheaths and installing any missing or damaged polyurethane protective strips. This AD requires the same actions. This AD results from the need to clarify the population of affected propellers previously listed in AD 2006-05-05. We are issuing this AD to prevent erosion sheath separation leading to damage of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
Overhaul all installed propeller blades of propellers listed in the applicability, within 30 days after the effective date of this AD, unless previously done per AD 2006-05-05.
Information about inspection procedures and acceptable limits can be found in Table 1 of this AD.
| For propeller model... | See operation and installation manual... |
|---|---|
| MT | No. E-112, issued Nov. 1993 or later. |
| MTV-1, MTV-7, MTV-18 | No. E-118, issued March 1994 or later. |
| MTV-5, MTV-6, MTV-9, MTV-11, MTV-12, MTV-14, MTV-15, MTV-21 | No. E-124, issued March 1994 or later. |
| MTV-3 | No. E-148, issued March 1994 or later. |
(h) During the next preflight inspection or 100-hour inspection, whichever occurs first, after the effective date of this AD, inspect all MT and MTV propellers by doing the following:
(1) Determine if the erosion sheath of any propeller blade is cracked or loose; and
(2) Determine if any propeller blade has other damage out of acceptable limits.
(3) Before the next flight, remove from service those propeller blades with a cracked or loose erosion sheath, or other damage affecting airworthiness.
(i) During the next pilot's preflight inspection after the effective date of this AD, if the polyurethane protective strip on the leading edge of the inner portion of the blade is found to be damaged or missing, the polyurethane protective strip must be replaced or installed within 10-flight hours. If electrical de-icing boots are installed, no polyurethane protective strips are required.
If after the effective date of this AD, any propeller blade erosion sheath found to be cracked or loose during the pilot's preflight inspection, or 100-hour inspection, or annual inspection, must be repaired, replaced, or overhauled before the next flight.
If after the effective date of this AD, any propeller blade polyurethane protective strip found to be damaged or missing during the pilot's preflight inspection, or 100-hour inspection, or annual inspection, must be replaced or installed within 10-flight hours. If electrical de-icing boots are installed, polyurethane protective strips are not required.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Propellers
