Airworthiness Directive · Amendment 39-11842 · McCauley Propeller Model 4HFR34C653/L106FA-0
McCauley Propeller Model 4HFR34C653/L106FA-0
McCauley Propeller Systems 4HFR34C653/L106FA-0 model propellers that are installed on Jetstream series 3200 airplanes; and 4HFR34C653/L106FA-0 model propellers installed on Ayres S2R-G5 and S2R-G10 airplanes, if the propeller was previously installed on Jetstream Series 3200 airplanes, or if the installation history of the propeller is unknown.
Note 1: This airworthiness directive (AD) applies to each propeller identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For propellers that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) that is applicable to McCauley Propeller Systems 4HFR34C653/L106FA-0 model propellers that are installed on Jetstream Series 3200 airplanes. This action is also applicable to 4HFR34C653/L106FA-0 model propellers that are installed on Ayres S2R-G5 and S2R-G10 airplanes if the propeller was previously installed on Jetstream Series 3200 airplanes or if installation history of the propeller is unknown. This action requires one-time and repetitive eddy current inspections of the camber side of the blade surface. This amendment is prompted by a report of a crack on the camber side of the blade surface. The crack was found during a dye penetrant inspection as part of a normal overhaul process. The actions specified in this AD are intended to detect cracks that could cause failure of the propeller blade, which can result in loss of control of the airplane.
To prevent failure of the propeller blade, which can result in loss of control of the airplane, perform EITHER of the following inspections:
(a) Do initial and repetitive eddy current inspections of the camber side of the propeller blade in accordance with McCauley Propeller Systems Alert Service Bulletin (ASB) 234 as follows:
(1) Inspect in accordance with Section I, Eddy Current Inspection, paragraph 1.a. through Section I, Part I, paragraph l.
(2) Evaluate suspect indications in accordance with Section I, Part II, Evaluation of Suspect Indications, paragraph a. through paragraph g.
(b) Or, remove the propeller, and perform initial and repetitive dye penetrant inspections of the camber side of the propeller blade in accordance with ASB 234, Section II, Dye Penetrant Inspection, paragraph a. through paragraph f.
(c) Individuals performing inspections defined in paragraph (a) and paragraph (b) of this AD must have a specialized rating in the applicable inspection method. Personnel must be qualified and certified to the minimum recommended requirements of “Level II” as described in Aerospace Industries Standard —NAS 410 or the equivalent national or international standard.
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
