AD 78-01-13

78-01-13 MCCAULEY PROPELLERS: Amendment 39-3120. Applies to the Model D2AF34C305 propellers installed on the rear engine of certain Cessna T337G aircraft (having Serial Numbers P337-0001 through P337-0193), and Cessna FT337GP aircraft (having Serial Numbers FP33700001 through FP33700013).

Compliance required as indicated, unless already accomplished.

To detect propeller hub cracks and prevent possible failures, accomplish the following:

(a) Propellers with less than 490 hours time in service, as of the effective date of this AD, inspect in accordance with paragraph (c) within 500 hours total time in service and reinspect every 50 hours from the last inspection in accordance with paragraph (c).

(b) Propellers with 500 or more hours in service, or whose total time in service is unknown, as of the effective date of this airworthiness directive inspect in accordance with paragraph (c) within the next 10 hours time in service and reinspect every 50 hours from the last inspection in accordance with paragraph (c).

(c) The following inspection(s), (1) or (2) as applicable, should be made by a Federal Aviation Administration certificated A & P Mechanic, or an appropriately rated certificated repair station:

(1) Visually inspect hub extension exterior surface for cracks with a 10X (power) glass between the spinner bulkhead and engine flange. Refer to notes and sketch which follow. Removal of the cowl or propeller spinner is not necessary for this inspection. Replace before further flight any cracked hub with an airworthy hub.

(2) In the event that the propeller is removed from the engine, remove the 'O' ring from the hub and clean. Inspect the interior and exterior surfaces for cracks within the first inch and a half from the engine mounting flange by dye penetrant method. Refer to notes and sketch which follow. Replace before further flight any cracked hub with an airworthy hub.

NOTES: (i) Excessive paint overspray from theexterior painting of aircraft may be present in this area and must be removed prior to inspection. (ii) If a new hub is installed, inspection requirements will again return to the start of the 500 hour inspection requirement then followed by the 50 hour inspection requirement.

(McCauley Service Bulletin No. 128-A and Cessna Service Letter ME77-21, or later Federal Aviation Administration approved revisions, also pertain to this subject.)

The manufacturer's specifications and procedures identified in this directive are incorporated herein and made part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by the directive who have not already received these documents from the manufacturer, may obtain copies upon request to McCauley Accessory Division, Cessna Aircraft Company, Box 7, Roosevelt Station, Dayton, Ohio 45417. These documents may also be examined at the Great Lakes Regional Office, 2300 East Devon Avenue, Des Plaines, Illinois 60018, and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. 20591. A historical file on this airworthiness directive which includes incorporated material in full is maintained by the FAA at its headquarters in Washington, D.C., and the Great Lakes Region.

This amendment becomes effective: January 16, 1978.