Bell Helicopter Textron Canada (BHTC), Model 206 series helicopters
as follows: Model 206A, 206B Serial Numbers (S/N) 004 through 660
and 672 through 715 661 through 671 and 716 through 4586 and 5101
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. Helicopters which have incorporated the modification consisting
of relocation of the purge hose, as per instructions provided in
Part II of (ASB) 206-05-103 (Requirement 2 of the initial issue of
this Directive), are to restore the purge hose to the previous
configuration, which existed prior to the introduction of this
Alert Service Bulletin.
Note: Transport Canada AD CF-2005-10R1
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 - Before further flight after 29 December
This Amendment becomes effective on 2 December 2005.
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
The original issue of this Directive became effective on 16 June