From Mandatory Service Letter

Landing Gear – Inspect the Steering Support Bracket for Incorrect Bolts

Date: May 30, 2019

Effectivity: King Air 90 (applicable variants within defined LJ serial range), Serial Numbers LJ-1964 through LJ-2139; King Air B200GT, Serial Numbers BY-75 through BY-298; King Air 200C/B200C, Serial Numbers BL-154 through BL-170; King Air 200/B200, Serial Numbers BB-2004 through BB-2018; King Air B300C, Serial Numbers FM-27 through FM-69.

Description: Inspect the steering support bracket for the presence of incorrect bolts. If found, replace incorrect bolts.

Compliance – Recommended: This service document should be accomplished at a scheduled maintenance period or inspection.

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

The mechanic must complete all of the in-structions in the service document, including the intent therein.

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.

The mechanic or airplane owner must use the technical data in the service document only as approved and published.

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.

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 organization 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.

From Multi-Engine Turboprop Communiqué ME-TP-0013

Date: May 2019

ATA 25 – Crew Seat Armrest Stop Pin
C90GT; B200GT/B200GTC; B300 Series

Crew seat armrests are subject to abuse as it is often used as a prop to get in and out of the crew seat. The mechanism was not designed for this purpose and the result is damage to the MS171538 split pin which it is there as a stop when it is used as an armrest (see photo, below).

Engineering has approved the use of a solid pin to provide a more robust installation; however, it is still recommended that the armrest be folded up and out the way while entering or existing the crew position and not used as a prop. The part number of the solid pin is MS16556-833, available from Textron Aviation Parts and Distribution.

This change started at FL-1176, FM-79, BY-347, LJ-2160 and on. For aircraft with this installation, you will bond the pins into the armrest frames using Loctite 609.

ATA 28 – Fuel Heated Vent Outer Coating

The King Air fuel heated vent outer coating is subject to elements and airstream causing the outer coating to erode with time. If the heated vent is still heating, the coating can be re-applied with a product part number 8B6A available from Textron Aviation Parts.

ATA 33 – LED Recognition Light Replacement

Textron Aviation Engineering has approved the use of LED Recognition lights as the direct replacement for halogen lights on the B300. The new part number is 130-381001-0003. When installing the new LED lights, both the left and the right-hand light assemblies must be replaced. Additionally, the installation will require the replacement of two spacers already installed with new spacers part number NAS43DD3-11FC. No wiring changes are needed, and polarity is not an issue.

ATA 34 – Availability of Rockwell Collins ProLine Fusion King Air Desk-top Trainer

Rockwell Collins recently released an FMS desktop trainer for Fusion-equipped King Airs. The FMS Desktop Trainer software is based on the Fusion phase 3 B350 and provides a near real-time, Windows simulation environment that allows the user to become familiar with Rockwell Collins Flight Management System avionics. However, this is not a high-fidelity aircraft flight simulation. The FMS Desktop Trainer is targeted toward aircraft owner/operators intent on gaining a high degree of familiarity with the Rockwell Collins FMS capabilities in their aircraft. In addition, the FMS Desktop Trainer can assist the aircraft owner/operator in flight planning operations provided the user has current database subscriptions with the Rockwell Collins, FMS and Database Support Engineering department. It is assumed that the user already possesses the owner’s manual and Operator Guide that was provided with the aircraft. The FMS Desktop Trainer is responsible for running the Rockwell Collins, Rehosted Operation Flight Program (ROFP) avionics to the extent necessary for the FMS to accomplish its principal task of aircraft navigation via FMS on a Windows hosted computer. The fidelity of the simulated avionics components varies from simplistic models to sophisticated rehosting of the actual avionics applications. Consequently, not all FMS capabilities are available.

The equipment needed to setup and operate an FMS Desktop Trainer is a personal computer running a compatible version of the Windows operating system. See specific Communiqué for Minimum PC System Requirements. The FMS Desktop Trainer must be registered and licensed with Rockwell Collins to operate. Registered aircraft owners/operators may contact Collins at to arrange for access. Non-registered persons can still purchase a copy by registering at Once registered and logged in, you can select the trainer from the list provided in the training catalog.

ATA 36 – Pneumatic Pressure Indication Increases on Ascent
LJ-1 through LJ-1062; LA-1 and after; B-1/BE-1 and after; BB-2 through BB-913

Reports of pneumatic pressure indication increasing when the airplane is climbing is a sign that the seal between the pneumatic pressure regulator and the adapter has broken. This adapter provides an air reference for the regulator to regulate the airplane’s pneumatic pressure. If the seal is broken, the air reference is lost, and the regulator is reading cabin pressure evident as an increase of the airplane’s pneumatic pressure indication. The adapter should have a 101-970120-9 gasket between the regulator body and the adapter, and it is installed with RTV-732.

On older airplanes, the issue is with the adapter becoming brittle and cracking, having the same effect. The adapter or weld assemblies are 50-970091 (for LJ-1 through 501); 101-970120-1 or -3 (for the other models listed above).

From Multi-Engine Turboprop Communiqué ME-TP-0014

Date: June 2019

ATA 21 – AirComm Corporation (ACC) Formerly Keith Products Laptop Setup Procedures
B200/B200GT; B300/B300C with ACC Environmental System

This entire Communiqué provides the steps to set up a Windows 7 or newer computer to troubleshoot the ACC Environmental System.

For Windows XP or older systems, see Communique KA-2015-05 for previous instructions for Keith Setup.

Go to website listed below to get the multi-page detailed instructions.

The information provided in this column may be abbreviated for space purposes. For the entire communication, go to

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