Commonwealth legislation

AD/BELL 214/9 Main Rotor Yoke Assembly

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

Mandates owners/operators of Bell 214B and 214B‑1 helicopters S/N 28001–28070 fitted with main rotor yoke P/N 214‑010‑105‑001 to replace that yoke, fit model‑specific airspeed‑vs‑altitude decals, and inspect the yoke for straightness under the helicopter maintenance manual.

Replacement timing depends on current hours‑in‑service (by 3,750 hours or within 50 hours); inspections recur every 1,200 hours. The directive targets reduced residual compressive stresses that could cause yoke failure; operators carry the compliance cost and must schedule work per the manual.

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Current sections

Direct links to the current provisions in AD/BELL 214/9 Main Rotor Yoke Assembly.

Bell Helicopter Textron 214B and 214B-1

Bell Helicopter Textron 214B and 214B-1 Series Helicopters

AD/BELL 214/9	Main Rotor Yoke Assembly	14/2018

Applicability:	Bell Helicopter Textron Inc. (BHTI) model 214B and 214B-1 helicopters, serial numbers (S/N's) 28001 through 28070, equipped with main rotor yoke assembly (assembly) part number (P/N) 214-010-105-001, certificated in any category.
Requirement:	1. Replace main rotor yoke assembly (assembly), part number (P/N)214-010-105-001.2. Install new airspeed versus altitude decals, P/N 214-075-256-105 for BHTI Model 214B-1 and P/N 214-075-256-107 for Model 214B helicopters.3. Inspect the yoke for straightness in accordance with the applicable maintenance manual for the helicopter, as in force from time to time.Note 1: BHTI Alert Service Bulletin No. 214-87-37 Revision A, dated 10 September 1987, as in force at the commencement of this AD, pertains to this AD.Note 2: FAA AD 93-21-10 refers.
Compliance:	1. a. For assemblies that have 3,700 hours' or less time-in-service on the commencement date of this airworthiness directive (AD), replace the assembly on or before reaching 3,750 hours' time in service.b. For assemblies that have more than 3,700 hours' time-in-service on the commencement date of this AD, replace the assembly within the next 50 hours' time-in-service.2. Unless already accomplished, within 50 hours' time-in-service after the commencement date of this AD.3. Within 50 hours’ time in service, unless previously accomplished, and thereafter at intervals not to exceed 1,200 hours' time-in-service.
	This AD commences on 17 July 2018.
Background:	This AD is prompted by an analysis that revealed a deterioration of residual compressive stresses in the main rotor yoke assembly with increased time in service.

	The actions specified by this AD are intended to prevent failure of the assembly, loss of the main rotor, and subsequent loss of control of the helicopter.

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Pieter van Dijk
Delegate of the Civil Aviation Safety Authority

9 July 2018

AD/BELL 214/9

Main Rotor Yoke Assembly

14/2018

Source text

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

Bell Helicopter Textron 214B and 214B-1 Bell Helicopter Textron 214B and 214B-1 Series Helicopters

Bell Helicopter Textron 214B and 214B-1 Series Helicopters

AD/BELL 214/9	Main Rotor Yoke Assembly	14/2018

Applicability:	Bell Helicopter Textron Inc. (BHTI) model 214B and 214B-1 helicopters, serial numbers (S/N's) 28001 through 28070, equipped with main rotor yoke assembly (assembly) part number (P/N) 214-010-105-001, certificated in any category.
Requirement:	1. Replace main rotor yoke assembly (assembly), part number (P/N)214-010-105-001.2. Install new airspeed versus altitude decals, P/N 214-075-256-105 for BHTI Model 214B-1 and P/N 214-075-256-107 for Model 214B helicopters.3. Inspect the yoke for straightness in accordance with the applicable maintenance manual for the helicopter, as in force from time to time.Note 1: BHTI Alert Service Bulletin No. 214-87-37 Revision A, dated 10 September 1987, as in force at the commencement of this AD, pertains to this AD.Note 2: FAA AD 93-21-10 refers.
Compliance:	1. a. For assemblies that have 3,700 hours' or less time-in-service on the commencement date of this airworthiness directive (AD), replace the assembly on or before reaching 3,750 hours' time in service.b. For assemblies that have more than 3,700 hours' time-in-service on the commencement date of this AD, replace the assembly within the next 50 hours' time-in-service.2. Unless already accomplished, within 50 hours' time-in-service after the commencement date of this AD.3. Within 50 hours’ time in service, unless previously accomplished, and thereafter at intervals not to exceed 1,200 hours' time-in-service.
	This AD commences on 17 July 2018.
Background:	This AD is prompted by an analysis that revealed a deterioration of residual compressive stresses in the main rotor yoke assembly with increased time in service.

	The actions specified by this AD are intended to prevent failure of the assembly, loss of the main rotor, and subsequent loss of control of the helicopter.

Pieter van Dijk
Delegate of the Civil Aviation Safety Authority

9 July 2018

AD/BELL 214/9 Main Rotor Yoke Assembly

Plain English Summary

Deep dive

Current sections

Bell Helicopter Textron 214B and 214B-1 Series Helicopters

Bell Helicopter Textron 214B and 214B-1 Series Helicopters

AD/BELL 214/9

AD/BELL 214/9

Main Rotor Yoke Assembly

Main Rotor Yoke Assembly

14/2018

14/2018

Source text

Bell Helicopter Textron 214B and 214B-1 Bell Helicopter Textron 214B and 214B-1 Series Helicopters

Bell Helicopter Textron 214B and 214B-1 Series Helicopters

AD/BELL 214/9 AD/BELL 214/9

AD/BELL 214/9

Main Rotor Yoke Assembly Main Rotor Yoke Assembly

Main Rotor Yoke Assembly

14/2018 14/2018

14/2018