Airworthiness directives › 2021-16-12
AD 2021-16-12 Airworthiness Directives; Bell Textron Canada Limited Helicopters
Models named: 505. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bell Textron Canada Limited Model 505 helicopters, certificated in any category, with serial numbers (S/Ns) 65011 through 65023 inclusive, 65025 through 65028 inclusive, 65030 through 65032 inclusive, 65034, and 65036 with relay panel assembly part number (P/N) SLS-075-002-107 installed. Note 1 to paragraph (c): Helicopters with S/Ns 65011 through 65023 inclusive, 65025 through 65028 inclusive, 65030 through 65032 inclusive, 65034, and 65036 are known to have had relay panel assembly P/N SLS-075-002-107 installed during production.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 25 hours time-in-service after the effective date of this AD, replace relay panel assembly P/N SLS-075-002-107 with relay panel assembly P/N SLS-075-002-109 by following the Accomplishment Instructions, paragraphs 1.a. through 3, of Bell Helicopter Alert Service Bulletin 505-17-04, dated December 6, 2017. (2) As of the effective date of this AD, do not install relay panel assembly P/N SLS-075-002-107 on any helicopter.
Unsafe condition
This AD was prompted by three occurrences of metallic debris in the engine oil lubrication system causing a short to ground within the engine chip detector. The FAA is issuing this AD to prevent failure of the 12 volts direct current (VDC) reference voltage, loss of display of important flight information to the pilot including the main rotor rotations per minute (Nr), fuel quantity, and transmission oil pressure and temperature, and the generator voltage and ammeter parameters as marked invalid with a red “X” on the primary flight display (PFD) and the multi-function display (MFD). The unsafe condition, if not addressed, could result in simultaneous loss of caution, advisory, and system performance indicators for multiple systems.
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