Airworthiness directives › 2021-10-08
AD 2021-10-08 Airworthiness Directives; Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited) Helicopters
Models named: 206L, 206L-1, 206L-3, 206L-4. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bell Textron Canada Limited (type certificate previously held by Bell Helicopter Textron Canada Limited) Model 206L, 206L-1, 206L-3, and 206L-4 helicopters, certificated in any category, with a low fuel level detector switch unit (switch unit) part number (P/N) 206-063-613-003: (1) With a switch unit serial number (S/N) 1413, 1414, 1415, 1424, 1428, 1430, 1432, or 1433 installed, or (2) With a missing or illegible switch unit S/N or if the S/N cannot be determined, installed. Note 1 to paragraph (c): Helicopters with a 206L-1+ designation are Model 206L-1 helicopters. Helicopters with a 206L-3+ designation are Model 206L-3 helicopters. Note 2 to paragraph (c): The switch unit is located on the aft fuel boost pump assembly. The P/N and S/N for the switch unit could be on the outside face of the attachment flange, in the cross hatched area of the switch unit.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For a switch unit identified in paragraph (c)(1) of this AD, on or before the next 100-hour time-in-service inspection after the effective date of this AD, remove the switch unit from service. (2) For a switch unit identified in paragraph (c)(2) of this AD, on or before the next 100-hour time-in-service inspection after the effective date of this AD: (i) Determine the color of the switch unit mounting flange. If the mounting flange color is any color other than red, determine the purchase date. If the purchase date of the switch unit is between April 19 and July 26, 2004, or cannot be determined, do an operational test. (ii) If the switch unit fails the operational test, before further flight, remove the switch unit from service. (3) As of the effective date of this AD, do not install a switch unit identified in paragraph (c)(1) of this AD on any helicopter. (4) As of the effective date of this AD, do not install a switch unit identified in paragraph (c)(2) of this AD on any helicopter unless the actions in paragraphs (g)(2)(i) and (ii) of this AD have been accomplished.
Unsafe condition
This AD was prompted by a manufacturing flaw that could cause a switch unit to hang in the high position and fail to indicate a low fuel condition. The FAA is issuing this AD to prevent failure of the switch unit to indicate a low fuel condition that could lead to fuel exhaustion and which if not addressed, could result in a subsequent forced landing.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1