YO-233-B2A Maintenance Manual
DATE RELEASED:
February 19, 2021
TITLE:
YO-233-B2A Maintenance Manual
DOCUMENT PART NUMBER:
MM-YO-233
(Supersedes Maintenance Manual LM-YO-233, dated June 2012)
Service Letter No. L 282
SERVICE LETTER NO. L282
Australian Fuel Testing
DATE:
December 11, 2020
TO:
Australian Robinson R22 and R44 Owners and Operators
REASON FOR PUBLICATION:
This Service Letter transmits information pertaining to recent engine testing performed on Avgas grades used in Australia and the United States.
Service Instruction No. 1579
Service Instruction No. 1579
Exhaust System Replacement Components
DATE:
November 20, 2020
SUBJECT:
Exhaust System Replacement Components
MODELS AFFECTED:
TIO-540-AJ1A
TIME OF COMPLIANCE:
As required.
Service Instruction No. 1577
Service Instruction No. 1577
Intake Valve In-Service Data
DATE:
November 10, 2020
SUBJECT:
Intake Valve In-Service Data
MODELS AFFECTED:
O-540-F1B5 engines with serial number ending with “-40E” installed in Robinson R44 Raven I and R44 Cadet helicopters
Service Instruction No. 1316 A
SUBJECT: Repair of Oil Cooler By-Pass Valve Seat
DATE: April 26, 1986
MODELS AFFECTED:
PART I: All Avco Lycoming piston engines equipped with a P/N 75944 oil cooler bypass valve.
PART II: All Avco Lycoming direct drive engines that incorporate either a dual magneto drive accessory housing or a P/N 69510 oil pressure screen and temperature valve housing on an individual magneto drive accessory housing.
TIME OF COMPLIANCE: During engine overhaul or earlier if oil leakage past the valve seat is determined to be the cause of high oil temperature.
Service Instruction No. 1014 N
Supersedes Service Instruction No. 1014M
DATE: July 29, 2020
MODELS AFFECTED
All Lycoming opposed series aircraft engines.
TIME OF COMPLIANCE
When preservation oil is removed or when lubricating oil is changed or added.
REASON FOR UPDATE
Updated lubrication oils and temperature ranges.
Special Service Publication No. SSP-110-2
Special Service Publication No. SSP-110-2
Certificated Engine List
DATE RELEASED:
May 2020
TITLE:
Certificated Engine List
DOCUMENT PART NUMBER:
SSP-110-2
Service Instruction No. 1009 BE
SERVICE INSTRUCTION NO. 1009 BE
Time Between Overhaul (TBO) Schedules
DATE:
April 24, 2020
SUBJECT:
Time Between Overhaul (TBO) Schedules
MODELS AFFECTED:
Lycoming Engine Models Defined Herein
Service Instruction No. 1060 U
SI-1060U – PUSH ROD IDENTIFICATION
DATE:
April 22, 2020
SUBJECT:
Push Rod Identification
MODELS AFFECTED:
All Lycoming aircraft engines.
TIME OF COMPLIANCE:
Anytime push rod replacement is necessary.
REASON FOR REVISION:
Added IO-390-D to Tables 2 and 4. Revised CAUTION and NOTICE on page 1.
IO-390-D Series Engine Illustrated Parts Catalog
DATE RELEASED:
April 22, 2020
TITLE:
IO-390-D Series Engine Illustrated Parts Catalog
DOCUMENT PART NUMBER:
PC-IO-390-D
MODELS AFFECTED:
IO-390-D Series