Technically: From Beechcraft Service Letter # MTL-52-01

Technically: From Beechcraft Service Letter # MTL-52-01

Date: February 21, 2018

Doors – Cabin Door Lock Inspection

Effectivity: King Air C90GTi, Serial Numbers LJ-2130 through LJ-2137; King Air B200GT, Serial Numbers BY-259 through BY-277, BY-279 through BY-285; King Air B200CGT, Serial Number BZ-1; King Air B300C, Serial Numbers FM-67 through FM-69; and King Air B300, Serial Numbers FL-1063 through FL-1089.

Reason: Textron Aviation has received two reports that on the main entry door lock, the lockset became disengaged from the housing.

Description: This service document provides parts and instructions to inspect the main entry door lock to determine if the plunger has been ground to the point where looseness occurs between the housing and the lockset plunger.

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:

1) The mechanic must complete all of the instructions 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 iden-tified 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 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 accom-plished at a Textron Aviation-owned Service Center.

Work Phase Labor-Hours  Labor Hours:
Modification                                           2.5
Inspection                                               0.5

Warranty: This service document is recommended. Eligible airplanes may qualify for parts and labor coverage to the extent noted in the Labor Hours and Material Availability sections of this document.

Eligibility: Airplanes identified within the serial number effectivity of this service document must have active airframe warranty coverage on the original issue date of this document and the coverage must be active on the day the work is accomplished.

Parts Coverage: Textron Aviation-owned and Textron Aviation-Authorized Service Facilities, operators, or other maintenance facilities may submit a claim for the parts required to accomplish this service document as defined in the Material Availability section of this document.

Labor Coverage: Textron Aviation-owned and Textron Aviation-Authorized Service Facilities rated to perform maintenance on the specific model of Beechcraft Aircraft may submit a claim for the labor necessary to accomplish this service document as defined in the Labor Hours section of this document.

Credit Application: After this service document has been accomplished, a claim must be submitted to Textron Aviation within 30 days of the service document completion. Claims for compliance of this service document are to be filed as a W4 type claim.

Expiration: February 21, 2019 (After this date the owner/operator assumes the responsibility for compliance costs.)

Textron Aviation reserves the right to void continued airplane warranty coverage for the parts affected by this service document until the service document is accomplished.

Note: As a convenience, service documents are now available online to all our customers through a simple, free-of-charge registration process. If you would like to sign up, please visit the Customer Access link at to register.

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

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