89-24-01 R1 TELEDYNE CONTINENTAL MOTORS (TCM): Amendment 39-6358 as revised by Amendment 39-6645. Docket No. 89-ANE-11.
Applicability: TCM engines, Models TSIO-520B, BB, D, DB, E, EB, J, JB, K, KB, N, NB, UB, and VB equipped with scavenge oil pump gears, part numbers (P/N's) 635334, 639388, 649157, and 649159 except those engines equipped with starter adapter P/N's 642085A4 or 642085A5, those engines with serial numbers as shown in the Appendix of this AD, or those engines equipped with any starter adapter with a pulley for an air conditioner compressor drive, certificated in any category.
NOTE: "Appendix" refers to TCM Service Bulletin M90-6 which is not reprinted in this AD.
Compliance: Required within 500 flight hours after the effective date of this AD, or at the next maintenance event, after the effective date of this AD, during which the scavenge oil pump gears are removed from the engine, whichever occurs first, unless already accomplished.
To prevent possible failure of scavenge oil pump gears which could result in total loss of engine power, accomplish the following:
(a) Remove the scavenge oil pump gears from the scavenge oil pump housing and inspect the gear teeth for a drill point as shown in Figure 1 of the Appendix to this AD.
(1) If the drill point is present, inspect the gears in accordance with the procedures outlined in the Appendix to this AD.
(2) If the drill point is not present, a Rockwell hardness test may be conducted on the gear. If a Rockwell "A" value of 79 or greater or a Rockwell "C" value of 56 or greater is obtained, inspect the gear in accordance with the procedures outlined in the Appendix to this AD.
(3) If the gears fail the inspection specified in (1) or (2) above, replace the gears with serviceable P/N 649157 or P/N 649159 gears having the drill point marking.
NOTE: TCM SB M90-6 contains information relating to the requirements of this AD.
(b) Make an appropriate log book entry showing compliance with this AD.
(c) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished.
(d) Upon submission of substantiating data by an owner or operator through an FAA Airworthiness Inspector, an alternate method of compliance with the requirements of this AD or adjustments to the compliance (schedule) times specified in this AD may be approved by the Manager, Atlanta Aircraft Certification Office, Small Airplane Directorate, Aircraft Certification Service, Federal Aviation Administration, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349.
All persons affected by this AD who have not already received the appropriate service information from the manufacturer may obtain copies upon request to Teledyne Continental Motors, P.O. Box 90, Mobile, Alabama 36601. This information may be examined at the FAA, Regional Rules Docket, Office of the Assistant Chief Counsel, Federal Aviation Administration, New EnglandRegion, 12 New England Executive Park, Room 311, Burlington, Massachusetts 01803.
This AD revises Amendment 39-6358, AD 89-24-01.
This amendment (39-6645, AD 89-24-01 R1) becomes effective on August 10, 1990.