Commonwealth legislation

AD/BO 105/15 - Transmission Flange Shimming

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of Eurocopter BO 105 helicopters (serial numbers S 1 to S 876) to inspect and, if necessary, correct shims on transmission input/output shafts in accordance with MBB (Eurocopter) Alert Service Bulletin No ASB-BO 105-30-104 (Requirement; Applicability). The manufacturer states incorrect shim installation can cause rapid pinion gear wear and loss of tail-rotor drive; the inspection and any corrective work and its timing are the responsibility and cost of the aircraft owner/operator (Background; Compliance).

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AD/BO 105/15 - Transmission Flange Shimming

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Eurocopter BO 105 Series Helicopters

AD/BO 105/15 Transmission Flange Shimming 8/92

Applicability: All model BO 105 helicopters S/No S 1 up to and including S 876.

Requirement: Unless previously carried out action in accordance with MBB (Eurocopter) Alert Service Bulletin No ASB-BO 105-30-104.

Note: German AD 92-273 MBB/Eurocopters dated 29 April 1992 refers.

Compliance: As specified in the requirement document.

Background: The manufacturer has advised that shims fitted to the input/output shaft, installed in the main transmission, intermediate or tail rotor gearbox, may be incorrectly installed. If this condition exist, the pinion gear teeth will suffer rapid wear which if undetected will result in loss of tail rotor drive.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.