AD 77-05-04

77-05-04 TELEDYNE CONTINENTAL MOTORS: Amendment 39-2848. Applies to the following Teledyne Continental Motors engines installed in but not limited to: IO-520-D installed on Cessna 185 and 188 aircraft serial numbers 18502839 through 18503234, 18503236 through 18503284, 18503287, 18503291, 18503293, 18802349 through 18802887, and 18802893. IO-520-F, TSIO-520-C, TSIO-520-G, TSIO-520-M and TSIO-520-R installed on Cessna U-206, T-206, and T-207 aircraft serial numbers U20603021 through U20603693, U20603695, U20603696, U20603699, U20603712, 20700315 through 20700378. IO-520-L, TSIO-520-H, TSIO-520-R, installed on Cessna 210 and T-210 aircraft serial numbers 21061040 through 21061736, 21061738 through 21061763, 21061766, 21061771, 21061773, 21061775 through 21061777, 21061789. IO-470-L installed on Beech Model 95-B55, aircraft serial numbers TC-2003 through TC-2053. Compliance required as indicated after the effective date of this AD unless already accomplished. To prevent crankshaft failure: A. Engines with less than 100 hours total time in service accomplish the following: (1) Within the next 10 hours time in service, check propeller operation in accordance with paragraph C or E as appropriate, and thereafter at intervals not to exceed 10 hours time in service from the previous check until 100 hours total time in service has been reached, whereupon this special check may be discontinued if no problem is evident. (2) Within the next 10 hours time in service examine the oil filter or screen as appropriate for each engine in accordance with paragraph F, and thereafter at intervals not to exceed 25 hours time in service until 100 hours total time in service has been reached, whereupon this special examination may be discontinued if no problem is evident. B. Engines with 100 hours or more total time in service, perform a one-time check or inspection of the following: (1) Within the next 10 hours time in service, check propeller operationin accordance with paragraph C or E as appropriate. (2) Within the next 10 hours time in service, examine the oil filter or screen, for each engine, in accordance with paragraph F. C. Check single engine airplane propeller operation as follows: (1) Ascertain that oil temperature is at or above the middle of the green arc on the oil temperature gage but in no case above the red line. CAUTION: Do Not Exceed Maximum Cylinder Head Temperatures. (2) With the propeller control in the low-pitch high RPM position, set engine speed with the throttle to 1700 RPM. (3) At 1700 RPM, pull the propeller control to the full high-pitch low RPM position until minimum governing RPM is observed, then push the control back to the low-pitch high RPM position. Repeat this procedure three times noting minimum governing RPM each time. Using this procedure the RPM should drop at least 400 RPM and should be reasonably smooth and consistent. (4) If a minimum drop of 400 RPM is obtained consistently in Paragraph C(3), proceed with paragraph F at time intervals specified. NOTE: Propeller operation checks C(1) through C(4) may be performed by the pilot; however, requirements of C(5)(a) through C(5)(c) and Paragraph F require appropriately authorized mechanic or repair station. (5) If a minimum drop of 400 RPM cannot be obtained or the propeller operation is not smooth and consistent, the following additional checks are to be accomplished. (Reference the applicable Aircraft Service Manual.) (a) Operation of the propeller control -- check routing, control clamping, rod end attachments, control rigging and adjustment. (b) Governor operation -- check security, signs of leakage, arm attachment and stop adjustment. (c) Propeller -- check for any external signs of leakage and/or damage. D. If any discrepancies are noted when accomplishing 5(a), (b) or (c), correct condition and recheck in accordance with Paragraph C(1) through C(4). If propeller operation is not in accordance with Paragraph C(3), proceed immediately to Paragraph F and prior to further flight, contact Mr. R.J. Moore, FAA-DER SO-260, Teledyne Continental Motors, P.O. Box 90, Mobile, Alabama 36601, (205) 438-3411, or his representative for disposition or other equivalent disposition method authorized by the Chief, Engineering and Manufacturing Branch, ASO-210, P.O. Box 20636, Atlanta, Georgia 30320. E. Check multiengine airplane propeller operation as follows: NOTE: Propeller checks in paragraphs E(1) and E(2) may be conducted by the pilot. (1) Ground run the engine at 1000 RPM until some oil temperature is indicated. Increase the engine RPM to 1700 until oil temperature has stabilized at or above the middle of the green arc but in no case above the red line. CAUTION: Do not exceed maximum cylinder head temperatures. (2) Place the propeller control in the low-pitch high RPM position and set engine speed to 900 RPM using the throttle. Note any tendency of the propeller to feather after engine speed has stabilized. (3) If feathering does occur in Step (2), the following additional checks are to be accomplished. (Reference the applicable aircraft Service Manual.) (a) Operation of the propeller control -- check routing, control clamping, rod end attachments, control rigging and adjustment. (b) Governor operation -- check security, signs of leakage, arm attachment and stop adjustment. (c) Propeller -- check for any external signs of leakage and/or damage. If any discrepancies are noted in accomplishing Paragraph 3(a), (b) or (c), correct condition and recheck in accordance with Paragraph E(1) through E(2). If feathering occurs, proceed immediately to Paragraph F, and prior to further flight contact Mr. R.J. Moore, FAA-DER SO-260, Teledyne Continental Motors, P.O. Box 90, Mobile, Alabama 36601, (205) 438-3411, or his representative for disposition or other equivalent disposition method authorized by the Chief,Engineering and Manufacturing Branch, ASO-210, P.O. Box 20636, Atlanta, Georgia 30320. F. Perform the following inspections of the oil filter or screen for evidence of metal contamination. (1) Remove and cut open the oil filter or remove and inspect the screen (whichever is applicable). (2) Visually inspect for abnormal amount of metal. (3) Some small quantity of minute metal particles is considered normal; however, should an abnormal amount be present it could be indicative of bearing distress; therefore, check the magnetic properties of the metal, and prior to further flight, request disposition in accordance with Paragraph D or E as appropriate. (4) If no abnormal amount of metal is present, and propeller control checks as outline in Paragraph D or E are satisfactory, the aircraft may remain in service. NOTE: For the requirements regarding the listing of compliance and method of compliance with this AD in the airplane's permanent maintenance record, see FAR 91.173. NOTE: Teledyne Continental Motors Service Bulletin M77-6, Supplement 1, pertains to this same subject. This amendment becomes effective March 11, 1977.