| AD Number | 69-25-08 | Status | Active |
| Effective Date | February 19, 1970 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-938 |
| Product Type | ["Engine"] | Product Subtype | Not specified |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Lycoming Engines |
| Model(s) | GO-435-C2A GO-435-C2A2 GO-480-A1A GO-480-B GO-480-B1A6 GO-480-B1B GO-480-B1C GO-480-B1D GO-480-C1B6 GO-480-C1D6 GO-480-C2C6 GO-480-C2D6 GO-480-C2E6 GO-480-C3A6 GO-480-D1A GO-480-E1A6 GO-480-F1A6 GO-480-F2A6 GO-480-F2D6 GO-480-F3A6 GO-480-F3B6 GO-480-F4A6 GO-480-F4B6 GO-480-F6 GO-480-G1A6 GO-480-G1B6 GO-480-G1D6 GO-480-G1H6 GO-480-G1J6 GO-480-G2D6 GO-480-G2F6 GSO-480-A1A6 GSO-480-A1C6 GSO-480-A2A6 GSO-480-B1A6 GSO-480-B1B6 GSO-480-B1C6 GSO-480-B1E6 GSO-480-B1F6 GSO-480-B1G6 GSO-480-B1J6 GSO-480-B2C6 GSO-480-B2D6 GSO-480-B2G6 GSO-480-B2H6 IGO-540-A1A IGO-540-A1B IGO-540-B1A IGO-540-B1B IGO-540-B1C IGSO-480-A1A6 IGSO-480-A1B6 IGSO-480-A1C6 IGSO-480-A1D6 IGSO-480-A1E6 IGSO-480-A1F6 IGSO-480-A1G6 IGSO-540-A1A IGSO-540-A1C IGSO-540-A1D IGSO-540-A1E IGSO-540-A1F IGSO-540-B1A IGSO-540-B1C |
69-25-08 LYCOMING ENGINES: Amdt. 39-892 as amended by Amendment 39-938. Applies to Lycoming GO-435-C2A, GO-480, GSO-480 and IGSO-480 type engines using spline type reduction gear assemblies 72875 and 72879, GO-480 and GSO-480 type engines using flange type reduction gear assemblies 69346, 70412 and 71803 and IGO-540 and IGSO-540 type engines using reduction gear assemblies 72782, 74900, 75679, 76494 and 77731.
Compliance required unless already accomplished prior to the accumulation of six hundred (600) hours in service or 100 hours after the effective date of this AD whichever comes later for the GO-435, IGO-540 and IGSO-540 type engines and prior to the accumulation of seven hundred (700) hours in service or 100 hours after the effective date of this AD whichever comes later for GO-480, GSO-480 and IGSO-480 type engines. To prevent failure of the reduction gear assembly a one time inspection is to be accomplished as follows:
a. Check torque on reduction gearing pinioncage attaching nut.
1. If found to be in excess of 50 ft.-lbs. remove, inspect for damage and replace the oil retaining housing if necessary. During assembly comply with part (b) using a new lockplate and a pinion cage attaching nut torque of 400 ft.-lbs. When the assembly is disassembled replace thrust bearing oil slinger P/N 68319 with P/N 77454.
2. If found to be less than 50 ft.-lbs. disassemble the assembly and insure that all components meet approved specifications and replace the thrust bearing oil slinger P/N 68319 and P/N 77454 and the oil retaining housing. During assembly comply with part (b) using a new lockplate and a pinion cage attaching nut torque of 400 ft.-lbs.
b. If the pinion cage is secured with a spline nut it must be replaced with an approved hexagonal nut.
c. If the assembly has been rebuilt using thrust bearing oil slinger P/N 77454, stamp the suffix (-1) to the part number on the reduction gear housing.
Lycoming Service BulletinNo. 319A and Lycoming Service Instruction No. 1210A pertain to this subject.
Amendment 39-892 effective December 17, 1969.
This Amendment (39-938) is effective February 19, 1970.