Commonwealth legislation

AD/BELL 206/142 - Tailboom Assembly

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

6/10 complexity

Requires structural work on tailboom assemblies of specified Bell 206L-series helicopters: install a doubler and clip and re‑identify the tailboom, or — for other affected tailbooms — perform recurring eddy‑current inspections or install nutplate assemblies; replacing with listed tailboom part numbers ends the requirements. It applies to operators of the serial‑numbered helicopters named. Stated purpose: prevent tailboom cracking that could lead to tailboom failure and loss of control; the AD prescribes compliance windows and inspection intervals.

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Direct links to the current provisions in AD/BELL 206/142 - Tailboom Assembly.

AD/BELL 206/142 - Tailboom Assembly

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters

AD/BELL 206/142 Tailboom Assembly 13/98

Applicability: BHTC Model 206L series helicopters as indicated below in the Requirement part of this directive. Tailboom assemblies modified in accordance with Technical Bulletin (TB) 206L-96-191, or BHT-206-SRM-1, section 6-3-4, with upper tailboom skin part number (P/N) 206-033-004-155 installed, are not affected by this directive.

Requirement: To ensure the structural integrity of affected tailbooms, accomplish the following as applicable:

Part 1. Applies to Model 206L series helicopters, serial number (S/N) 45001 through 51283, having unmodified tailboom assemblies P/N 206-033-004- 003, -011, -045, and -103.

Modify the tailboom between boom station BS 151.15 and 159.35 by installing doubler P/N 206-704-167-111 with clip P/N 206-033-407-119, and re-identify the tailboom by adding the suffix “FM” to the original part number as outlined in Part I of Alert Service Bulletin (ASB) 206L-87-47 Revision C.

Part 2. Applies to the following Model 206L series helicopters:

Model 206L S/N 45003 through 45153, and 46601 through 46617, Model 206L-1 S/N 45154 through 45790, and Model 206L-3 S/N 51001 through 51283; having tailboom assemblies of the following part numbers:

206-033-004-003FM, -003FM1

206-033-004-011FM, -011FM1, -011FM2, -011FM3

206-033-004-103FM, -103FM1

206-033-004-045FM

For tailbooms with a sheet metal tail rotor gearbox support, perform an Eddy Current inspection as in Part I of ASB 206L-97-107 Revision A.

b. For tailbooms with a cast tail rotor gearbox support P/N 206-033-426-001 and that do not have upper skin P/N 206-033-004-155 installed; install nutplate assemblies as per Part II of ASB 206L-97-107 Revision A.

For all Model 206L helicopters affected by Parts 1 and 2 above, replacement of the tailboom with any tailboom listed below constitutes terminating action for the requirements of Parts 1 and 2 of this directive:

206-033-004-003FM2

206-033-004-011FM4

206-033-004-103FM2

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

206-033-004-045FM1, -045FM2

206-033-004-143, -143FM1

206-033-004-175, -175FM1

206-033-004-177

Note: Transport Canada AD CF-98-27 refers.

Compliance: Part 1. Within 200 hours time in service after 3 December 1998, but not later than 31 May 1999.

Part 2.a. Within 100 hours time in service after 3 December 1998, and thereafter at intervals not to exceed 1,000 hours time in service.

2.b. Within 200 hours time in service after 3 December 1998, but not later than 31 May 1999.

This Airworthiness Directive becomes effective on 3 December 1998.

Background: Cracking has been reported on tailbooms of earlier designs. If left undetected, these cracks could lead to failure of the tailboom and loss of control of the helicopter.

Source text

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

1 AD/BELL 206/142 - Tailboom Assembly

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters

AD/BELL 206/142 Tailboom Assembly 13/98

Requirement: To ensure the structural integrity of affected tailbooms, accomplish the following as applicable:

Part 1. Applies to Model 206L series helicopters, serial number (S/N) 45001 through 51283, having unmodified tailboom assemblies P/N 206-033-004- 003, -011, -045, and -103.

Part 2. Applies to the following Model 206L series helicopters:

Model 206L S/N 45003 through 45153, and 46601 through 46617, Model 206L-1 S/N 45154 through 45790, and Model 206L-3 S/N 51001 through 51283; having tailboom assemblies of the following part numbers:

206-033-004-003FM, -003FM1

206-033-004-011FM, -011FM1, -011FM2, -011FM3

206-033-004-103FM, -103FM1

206-033-004-045FM

For tailbooms with a sheet metal tail rotor gearbox support, perform an Eddy Current inspection as in Part I of ASB 206L-97-107 Revision A.

b. For tailbooms with a cast tail rotor gearbox support P/N 206-033-426-001 and that do not have upper skin P/N 206-033-004-155 installed; install nutplate assemblies as per Part II of ASB 206L-97-107 Revision A.

206-033-004-003FM2

206-033-004-011FM4

206-033-004-103FM2

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES