From Textron Aviation Technical Information Notification

TCAS Fly-to Cue Display Non-Compliance on Pro Line Fusion

Date: April 11, 2019

Collins Aerospace announced a potential conflict between displayed indications and TCAS aural cues on King Air 250s/350s and Citation CJ3s. The TCAS Fly-to Cue indication on the primary cockpit displays may conflict with other TCAS system information (e.g., aural cues) during a Resolution Advisory (RA) scenario.

Collins is working with the appropriate aviation authorities to validate and install software changes needed to correct the issue. In the meantime, you will need to take action to mitigate operational disruptions.

The King Air 250/350 Aircraft Flight Manual Limitations sections are being updated to direct operators to use Traffic Advisory (TA) mode only, which disables the RA function and makes the aircraft TCAS I capable. TCAS I will function normally, issue appropriate interrogations, perform all tracking functions and issue TA aural and display indications. Only the RA display and aurals will be disabled. Please refer to OPSB 0193-19 for instructions on how to disable the RA mode or to confirm your aircraft is impacted.

For non-FAA registered aircraft, or aircraft op-erating outside of the U.S., operators should consult with their local aviation authority to determine if operating exemptions will be required. For example, to comply with EASA TCAS II mandates for aircraft above 5700kg maximum certified takeoff mass (MCTOM), operators in EASA regions need to request and obtain a TCAS II exemption from the aviation authority that their aircraft is registered within. Additional information and recommended actions for applying for TCAS exemption will be communicated to customers directly through Collins representatives.

You will be notified when Collins has software available. For more information, please contact your regional Collins Avionics Support Engineer or the main Collins Avionics Customer Support Center at or (319) 295.5000.

Alternatively, you can contact your Textron Aviation team for support:

Team Turboprop at or (316) 517.9355

If you have any questions or comments regarding this [information], please contact

From Mandatory Service Letter

Ice and Rain Protection – Inertial Vane Control Journal Verification

Date: April 1, 2019

Effectivity: King Air B300, Serial Numbers FL-1079 thru FL-1089 and FL-1091 thru FL-1100; King Air B300C, Serial Number FM-71

Reason: The bushings in the 101-910114-13 and 101-910114-135 levers in the anti-ice control shaft assembly were not built to specifications on some units. When assembled the 101-910114-75 and 101-910114-77 journals were ground down to fit. This removed the cad plating and paint protecting the steel rod. The absence of this protection exposes the journal rod ends to corrosion and potential failure of the anti-ice system.

Description: This service document provides parts and instructions to inspect the forward and aft shaft assemblies of the engine inertial anti-icing system.

Compliance – MANDATORY: This service document must be accomplished within 12 months from the date of receipt.

A service document published by Textron Aviation may be recorded as completed in an aircraft log only when the following requirements are satisfied:

  1. The mechanic must complete all of the in-structions in the service document, including the intent therein.
  2. The mechanic must correctly use and install all applicable parts supplied with the service document kit. Only with written authorization from Textron Aviation can substitute parts or rebuilt parts be used to replace new parts.
  3. The mechanic or airplane owner must use the technical data in the service document only as approved and published.
  4. The mechanic or airplane owner must apply the information in the service document only to aircraft serial numbers identified in the Effectivity section of the document.
  5. The mechanic or airplane owner must use maintenance practices that are identified as acceptable standard practices in the aviation industry and governmental regulations.

No individual or corporate org-anization other than Textron Aviation is authorized to make or apply any changes to a Textron Aviation-issued service document or flight manual supplement without prior written consent from Textron Aviation.

Textron Aviation is not responsible for the quality of maintenance performed to comply with this document, unless the maintenance is accomplished at a Textron Aviation-owned Service Center.

The above information may be abbreviated for space purposes. For the entire communication, go to

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