80-22-53 AVCO LYCOMING: Amendment 39-3995. Applies to Avco Lycoming ALF5O2L and L2 engines except those installed in aircraft operated under an experimental airworthiness certificate. Compliance required as indicated, unless already accomplished. Prior to further flight, rework or replace the following parts and reassemble in accordance with Avco Lycoming Service Bulletin No. ALF502-72-0008, Revision No. 1, dated October 14, 1980, "Replacement of No. 4 and 5 Bearing Oil Inlet Tubes," and Service Bulletin No. ALF502-72- 0010, dated October 14, 1980, "Introduction of Improved Fourth Turbine Nozzle and Fire Shield," or an FAA approved equivalent:
a. Remove number 4 and 5 oil inlet tube assembly P/N 2-141-380-07/-08/-11/-12 and replace with P/N 2-141-380-13/-14.
b. Remove adapter assembly P/N 2-141-640-01 and replace with P/N 2-141-640-02.
c. If not previously incorporated, install: Bracket P/N 2-143-049-01, spacer P/N 2-143-051-01, two bolts P/N STD3061-11, Clamp P/N TA1501H05, Bolt P/N MS9565-06, Nut P/N STD3073-3, and Washer P/N STD3035C2.
d. Rework fourth stage turbine nozzle P/N 2-141-150-38 to P/N 2-141-150-42, or P/N 2-141-150-39 to P/N 2-141-150-41 in accordance with Service Bulletin No. ALF502-72-0010.
e. Rework upper half of fire shield P/N 2-163-990-04 to 2-163-990-07, or P/N 2-163-990-05 to 2-163- 990-08 in accordance with Service Bulletin No. ALF502-72-0010.
f. Install: Washer P/N 2-163-585-01, and Spring P/N 2-163-586-01, and Retainer P/N 2-163-584-01.
g. Remove oil feed line P/N 2-173-240-02 and replace with P/N 2-303-377-01.
h. Remove jam nut P/N R44118P05W. (The function of the jam nut is accomplished by the parts in "f" and "g" above.)
(i) Remove oil inlet support bracket P/N 2-141-335-02 and replace with P/N 2-141-335-03.
After replacement of the number 4 and 5 bearing oil inlet tube and associated hardware in accordance with this AD, inspect the number 4 and 5 bearing oil inlet tube every 100 engine operating hours thereafter for chafing in accordance with Avco Lycoming Service Bulletin No. ALF502-72-0008, Revision No. 1, or an FAA approved equivalent. Oil inlet tubes which exhibit chafing in excess of 0.010 inch deep must be replaced with like serviceable parts prior to further flight.
Airplanes may be ferried in accordance with the provisions of FAR 21.197 to a base where the AD can be accomplished. Upon request of the operator, an equivalent means of compliance with the requirements of this AD may be approved by the Chief, Engineering and Manufacturing Branch, FAA New England Region. Upon request of the operator, an FAA Maintenance Inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA, New England Region, may adjust the inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for that operator. Themanufacturer's procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Avco Lycoming, Stratford, Connecticut 06497.
These documents may also be examined at FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD which includes the incorporated material in full is maintained by the FAA at its Headquarters in Washington, D.C., and at the FAA, New England Region Headquarters, Burlington, Massachusetts.
This amendment becomes effective December 31, 1980 as to all persons except those persons to whom it was made immediately effective by the telegram of October 23, 1980.