Commonwealth legislation

AD/BELL 407/5 - Hydraulic Relief Valve Replacement

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legislative instrument

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This Directive requires owners/operators of Bell (BHTC) Model 407 helicopters, serial numbers 53000–53266, to replace hydraulic relief valve p/n 206-076-036-101 with p/n 206-076-036-105 per BHTC Alert Service Bulletin No. 407-98-20 (Requirement). Compliance is due within 300 flight hours or by 20 August 1999, whichever is earlier (Compliance); the AD is effective 20 May 1999 (Effective date). It responds to a manufacturing defect that can cause intermittent loss of hydraulic pressure to flight controls (Background). Owners/operators pay for and arrange the replacement; the Authority prescribes timing and method.

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AD/BELL 407/5 - Hydraulic Relief Valve Replacement

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) 407 Series Helicopters

AD/BELL 407/5 Hydraulic Relief Valve Replacement 5/99

Applicability: Bell (BHTC) Model 407 helicopters, serial numbers 53000 through 53266. Requirement: Replace hydraulic relief valves part number 206-076-036-101 with valve part number

206-076-036-105 in accordance with the provisions of BHTC Alert Service Bulletin

(ASB) No. 407-98-20, dated 3 July 1998.

Note: Transport Canada Airworthiness Directive CF-98-28, dated 18 October 1998 refers.

Compliance: Within the next 300 hours flight time after the effective date of this Directive, or by 20 August 1999, whichever occurs first.

This Airworthiness Directive becomes effective on 20 May 1999.

Background: A manufacturing defect has been found on hydraulic relief valve part number 206- 076-036-101 which could lead to an intermittent loss of hydraulic pressure to the flight controls. Replacement of the valve has been made mandatory to correct this safety of flight situation.

Source text

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

1 AD/BELL 407/5 - Hydraulic Relief Valve Replacement