Commonwealth legislation

AD/GBK 117/14 - Tail Rotor Drive Bearings

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of MBB‑BK117 A‑1 through C‑1 helicopters with specified tail rotor transmission or intermediate gearbox part/serial numbers, or units overhauled or repaired between 16 July 2001 and 14 April 2003, to inspect the magnetic plug (chip collection) of those gearboxes. The CASA delegate requires the inspection to be done in accordance with Eurocopter ASB MBB‑BK117‑30‑108 Revision 1; operators pay for and perform the inspections unless the parts were already inspected per Paragraph 2.B.2 of that ASB.

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Eurocopter BK 117 Series Helicopters

AD/GBK 117/14 Tail Rotor Drive Bearings

AD/GBK 117/14 Tail Rotor Drive Bearings 13/2003

Applicability: MBB-BK117 helicopters models A-1 though C-1 inclusive and incorporating any of the following:

A tail rotor transmission part number (P/N) 4639003001 or 4639003007 with a serial number (S/N) 900 through 932 inclusive; or

b. An intermediate gearbox P/N 4639002001 or 4639002005 with a S/N 902 though 928 inclusive; or

c. A tail rotor transmission P/N 4639003001 or 4639003007 that had been overhauled or repaired in the period 16 July 2001 to 14 April 2003, the effective date of Eurocopter Alert Service Bulletin (ASB) MBB-BK117-30-108 Revision 1; or

d. An intermediate gearboxes that had been overhauled or repaired in the period 16 July 2001 to 14 April 2003, the effective date of Eurocopter ASB MBB-BK117- 30-108 Revision 1; or

e. The tail rotor transmission and/or the intermediate gearbox is fitted with a bearing P/N 4639310006, S/N 3246 through 3598 inclusive; and

f. The tail rotor transmission and/or the intermediate gearbox has not been inspected in accordance with Paragraph 2.B.2 of Eurocopter ASB MBB-BK117- 30-108 Revision 1.

Requirement: 1. Installed tail rotor transmission and intermediate gearboxes not incorporating an electrical chip detector in the tail rotor transmission or intermediate gearboxes:

Inspect the magnetic plug of the tail rotor transmission in accordance with Paragraph 2A of Eurocopter ASB MBB-BK117-30-108 Revision 1.

b. Inspect the magnetic plug of the intermediate gearbox in accordance with Paragraph 2A.”Accomplishment Instructions” of Eurocopter ASB MBB- BK117-30-108 Revision 1.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

Eurocopter BK 117 Series Helicopters

AD/GBK 117/14 Tail Rotor Drive Bearings AD/GBK 117/14 Tail Rotor Drive Bearings 13/2003

AD/GBK 117/14 Tail Rotor Drive Bearings 13/2003

Applicability: MBB-BK117 helicopters models A-1 though C-1 inclusive and incorporating any of the following:

A tail rotor transmission part number (P/N) 4639003001 or 4639003007 with a serial number (S/N) 900 through 932 inclusive; or

b. An intermediate gearbox P/N 4639002001 or 4639002005 with a S/N 902 though 928 inclusive; or

c. A tail rotor transmission P/N 4639003001 or 4639003007 that had been overhauled or repaired in the period 16 July 2001 to 14 April 2003, the effective date of Eurocopter Alert Service Bulletin (ASB) MBB-BK117-30-108 Revision 1; or

d. An intermediate gearboxes that had been overhauled or repaired in the period 16 July 2001 to 14 April 2003, the effective date of Eurocopter ASB MBB-BK117- 30-108 Revision 1; or

e. The tail rotor transmission and/or the intermediate gearbox is fitted with a bearing P/N 4639310006, S/N 3246 through 3598 inclusive; and

f. The tail rotor transmission and/or the intermediate gearbox has not been inspected in accordance with Paragraph 2.B.2 of Eurocopter ASB MBB-BK117- 30-108 Revision 1.

Requirement: 1. Installed tail rotor transmission and intermediate gearboxes not incorporating an electrical chip detector in the tail rotor transmission or intermediate gearboxes:

Inspect the magnetic plug of the tail rotor transmission in accordance with Paragraph 2A of Eurocopter ASB MBB-BK117-30-108 Revision 1.

b. Inspect the magnetic plug of the intermediate gearbox in accordance with Paragraph 2A.”Accomplishment Instructions” of Eurocopter ASB MBB- BK117-30-108 Revision 1.