AD 2021-16-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada Limited | Airworthiness Directives; Bell Textron Canada Limited Helicopters |
| aircraft | Bell | Textron Canada Limited | Airworthiness Directives; Bell Textron Canada Limited Helicopters |
Unsafe Condition
three occurrences of metallic debris in the engine oil lubrication system causing a short to ground within the engine chip detector, resulting in 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).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replacing relay panel assembly part number (P/N) SLS-075-002-107 with relay panel assembly P/N SLS-075-002-109, as specified in Bell Helicopter Alert Service Bulletin 505-17-04, dated December 6, 2017.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Textron Canada Limited Model 505 helicopters, 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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.