Service Instruction No. 1008 C

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

Service Instruction No. 1506 A

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.

Service Bulletin No. 624

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.)

Service Bulletin No. 366 C

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.

Service Instruction No. 1397 A

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.

Service Instruction No. 1423 A

Supersedes Service Instruction No. 1423

May 13, 2016

MODELS AFFECTED

All Lycoming engines using Thermostatic Oil Cooler Bypass Valve Part Number (P/N) 75944

TIME OF COMPLIANCE

Before next flight REASON FOR REVISION: Loctite® procedure for crimp nut is no longer valid. New superseding part number for thermostatic oil cooler bypass valve.