Date: September 9, 2016

SUBJECT

Inspection and Removal of TCM and Bendix S-20 and S-1200 Series Impulse Coupling Magnetos.

MODELS AFFECTED

All Lycoming aircraft engines with TCM and Bendix S-20 and S-1200 series impulse coupling magnetos.

TIME OF COMPLIANCE

Within the next 10 hours of engine operation.

REASON FOR REVISION

Exclusion of Bendix Model S-20 or S-1200 magnetos with a snap-ring impulse coupling assembly from the 100-hour inspection and replacement requirement.

August 16, 2016

MODELS AFFECTED

All Lycoming engines with thermostatic oil cooler bypass valves: Part number (P/N) 53E19600 (with thermostatic oil cooler bypass valve serial numbers less than 53788), P/N 75944, P/N LW-13230, and P/N 53E19980 (with thermostatic oil cooler bypass valve serial numbers less than 159)

TIME OF COMPLIANCE

At the next oil change, not to exceed 50 hours, then annually thereafter

July 21, 2016

MODELS AFFECTED

All O-320, IO-320, O-340, O-360, IO-360, VO-360, HIO-360, IVO-360, O- 540, IO-540, IO-720, and TIO-541 engines that do not have a Thermostatic Oil Cooler Bypass Valve Assembly installed

TIME OF COMPLIANCE

Optional, at owner's discretion

REASON FOR REVISION

Updated required parts in Table 1; clarified procedure

DATE RELEASED:

July 2016

TITLE:

IO-390-A Parts Catalog

DOCUMENT PART NUMBER:

PC-IO-390-A

MODELS AFFECTED:

IO-390-A1A6, IO-390-A1B6, IO-390-A3A6, IO-390-A3B6

DATE RELEASED:

July 2016

TITLE:

IO-360-C1G6 Parts Catalog

DOCUMENT PART NUMBER:

PC-IO-360-C1G6

MODELS AFFECTED:

IO-360-C1G6

June 28, 2016

MODELS AFFECTED

Lycoming O, IO, AEIO-360 or O, IO, AEIO-320 series engines presently equipped with impulse coupling magnetos.

TIME OF COMPLIANCE

At owner’s discretion

REASON FOR REVISION

Added engine models to “MODELS AFFECTED”; clarified details in the text of this Service Instruction.

June 17, 2016

MODELS AFFECTED

All Lycoming engines equipped with Fuel Pump Part Number 62D26030, 62D26032, 62D26034, 62D26035, 62D26036, or 62D26037.

TIME OF COMPLIANCE

At the next regularly scheduled inspection or twelve (12) months after the effective date of this Service Bulletin (whichever occurs first.)

June 17, 2016

MODELS AFFECTED

Lycoming engine models TIO-540-S1AD, IO-540-K1G5, and IO-540-K1G5D

TIME OF COMPLIANCE

When necessary to replace engine mounting brackets

REASON FOR REVISION

Part number corrections in Table 1

June 2, 2016

MODELS AFFECTED

All Lycoming engines equipped with Marvel-Schebler, Facet, Precision, or Volare updraft carburetor models MA-3A, MA-3PA, MA-3SPA, MA-4SPA, MA-4-5, MA-4-5AA, and MA-6AA.

TIME OF COMPLIANCE

Within the next 50 hours of engine operation and every 50 hours thereafter during routine engine maintenance

REASON FOR REVISION

Correct the CAUTION after Step 3.

June 1, 2016

MODELS AFFECTED

All AEIO-320, -360, -390, -540 and -580 Aerobatic series engines

TIME OF COMPLIANCE

Every 300 hours of operation or any time there is evidence of oil discharge from the breather.

REASON FOR REVISION

Added 390 and 580 engine models and clarification.

This Service Instruction identifies necessary routine maintenance to be done on the inverted oil system of aerobatic Lycoming engines models.