AD/Bell 206/158 Amdt 2 Fuel Distribution System (Cth)
AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BELL 206/158 Amdt 1 and issues the following AD under subregulation 39.001(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.
Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters
| AD/BELL 206/158 Amdt 2 | Fuel Distribution System | 13/2006 TX |
Applicability: | Bell Helicopter Textron Canada (BHTC), Model 206 series helicopters as follows: | |
| Model 206A | Serial Numbers (S/N) 004 through 660 and 672 through 715 | |
Requirement: | 1. Inspect the grounding of the fuel pumps and solenoid valve, as per instructions provided in Part I of Alert Service Bulletin (ASB) 206-05-103, dated 11 February 2005, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. | |
| 2. Perform clamping of the purge hose and position the boost pumps as indicated, in accordance with Part II of ASB 206-05-103, Revision A dated 12 July 2006 or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 3. Verify the installation of the restrictor as per the instructions provide in Part III of ASB 206-05-103, Revision A or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 4. Verify the installation of a filter as per the instructions provide in Part IV of ASB 206-05-103, Revision A or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 5. For helicopters requiring the filter, amend the maintenance program to require a recurring 24 month inspection and cleaning as indicated in Part IV, paragraph 2 of ASB 206-05-103 or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. | ||
| Note: Transport Canada AD CF-2005-10R2 refers. | ||
Compliance: | For Requirement 1 - Remains unchanged as “Within the next 100 hours time in service, but no later than 10 July 2005”. | |
| For Requirement 2 - No later than 15 December 2006. | ||
| For Requirements 3, 4 and 5 - At the next 100-hour inspection but no later than 15 November 2006. | |
| This Amendment becomes effective on 25 October 2006. | |
Background: | Transport Canada has advised that inadequate electrical grounding of the fuel boost pump and the fuel drain solenoid valve, combined with fuel hoses contact, could cause arcing in the main fuel cell which may in turn cause an explosion and resultant fire. |
| The original issue of this Directive required a one time inspection to ensure correct grounding and, if necessary the disconnection and stowage of the engine fuel purge hose. | |
| Since Canadian Airworthiness Directive CF-2005-10 was issued, Transport Canada has determined that the purge hose relocation as per instructions provided in Part II of ASB 206-05-103, could cause an engine flameout in a low fuel, boost pump off, condition. Therefore, until further notice, Requirement 2 of the initial issue of this Directive is revoked and this Amendment requires the helicopter fuel purge hose to be returned to its previous configuration. Further investigation has revealed that the engine flameout was caused by absence of restrictor, part number 206-061-637-001 or 206-061-655-001. This amendment mandates purge hose installation and boost pump positioning in addition to verification of installation of a fuel restrictor and filter. | |
| The original issue of this Directive became effective on 16 June 2005. Amendment 1of this Directive became effective on 2 December 2005 |
James Coyne
Delegate of the Civil Aviation Safety Authority
18 October 2006
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