Citation
SERVICE LETTER
SL680A-25-17
REVISION TRANSMITTAL
This sheet transmits Revision 2 to SL680A-25-17, which: A. Changes the serial effectivity.
NOTE: This revision replaces the original issue and previous revision of SL680A-25-17 in their entirety.
REVISION COMPLIANCE
NO EFFECT. Airplanes previously modified by this service letter are not affected by this revision.
LOG OF REVISIONS
Original Issue September 11, 2019
Revision 1 November 21, 2019
Revision 2 March 9, 2020
Original Issue - September 11, 2019 SL680A-25-17
Revision 2 - March 9, 2020 Page 1 of 1
Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-5800 COPYRIGHT © 2019
Citation
SERVICE LETTER
SL680A-25-17
TITLE
EQUIPMENT/FURNISHINGS - REPLACEMENT OF THE SEAT PAN TILT SNAP RINGS (MILLENNIUM SERVICE BULLETIN SB2050-25-20-02B)
EFFECTIVITY
MODEL SERIAL NUMBERS
680A (Citation Latitude) -0197, -0199 thru -0226
REASON
The snap rings that secure the seat pan tilt pivot block fitting on the Millennium crew seats may become disconnected and allow the front of the seat pan to fall under certain conditions.
DESCRIPTION
This service letter transmits Millennium Service Bulletin SB2050-25-20-02 Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement, Revision B which provides instructions to replace the seat pan tilt snap rings.
COMPLIANCE
RECOMMENDED. This service document should be accomplished at the next scheduled maintenance period or inspection.
A service document published by Textron Aviation may be recorded ascompletedin 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 identified in theEffectivitysection 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 accomplished at a Textron Aviation-owned Service Center.
CONSUMABLE MATERIAL
No specialized consumable materials are required to complete this service document.
TOOLING
No specialized tooling is required to complete this service document.
Original Issue - September 11, 2019 SL680A-25-17
Revision 2 - March 9, 2020 Page 1 of 2
Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-5800
This document contains technical data and is subject to U.S. export regulations. This information has been exported from the United States in accordance with export administration regulations. Diversion contrary to U.S. law is prohibited. ECCN: 9E991
SL680A-25-17
Page 2 Revision 2 - March 9, 2020
Citation
SERVICE LETTER
SL680A-25-17
REFERENCES
Millennium Service Bulletin SB2050-25-20-02 Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement, Revision B.
PUBLICATIONS AFFECTED
None
ACCOMPLISHMENT INSTRUCTIONS
1. Do attached Millennium Service Bulletin SB2050-25-20-02 Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement Revision B.
2. Make an entry in the airplane logbook that states compliance and method of compliance with this service document.
NOTE: Textron Aviation recommends that compliance with all service documents is reported to a maintenance tracking system provider.
• Complete a record of compliance. (Maintenance Transaction Report, Log Book Entry, or other record of compliance.)
• Put a copy of the completed record of compliance in the airplane logbook.
• Send a copy of the completed record of compliance to your maintenance tracking system provider.
MATERIAL INFORMATION
Order the kit below to install this modification.
NOTE: Each crew seat requires one kit . Two kits could be necessary for each aircraft.
NEW P/N QUANTITY KEY WORD OLD P/N INSTRUCTIONS/
DISPOSITION
MKIT2050-252002B 1 kit per seat Millennium Crew Seat Modification Kit
N/A Install
* Please contact Textron Aviation Parts Distribution for current cost and availability of parts listed in this service document. Phone at 1-800-835-4000 (Domestic) or 1-316-517-5603 (International). Send email to: parts@txtav.com.
Citation
OWNER ADVISORY
SL680A-25-17
TITLE
EQUIPMENT/FURNISHINGS - REPLACEMENT OF THE SEAT PAN TILT SNAP RINGS (MILLENNIUM SERVICE BULLETIN SB2050-25-20-02B)
TO:
Cessna Model 680A (Citation Latitude) Aircraft Owner
REASON
The snap rings that secure the seat pan tilt pivot block fitting on the Millennium crew seats may become disconnected and allow the front of the seat pan to fall under certain conditions.
COMPLIANCE
RECOMMENDED. This service document should be accomplished at the next scheduled maintenance period or inspection.
LABOR HOURS
WORK PHASE LABOR-HOURS
Removal/Installation of Each Seat 1.0 Replacement of Snap Rings for each seat 0.5
MATERIAL AVAILABILITY
Order the kit below to install this modification.
NOTE: Each crew seat has two snap rings. Two kits could be necessary for each affected crew seat.
PART NUMBER AVAILABILITY COST
MKIT2050-252002B * *
* Please contact Textron Aviation Parts Distribution for current cost and availability of parts listed in this service document. Phone at 1-800-835-4000 (Domestic) or 1-316-517-5603 (International). Send email to: parts@txtav.com.
WARRANTY
This service document isrecommended. Eligible airplanes may qualify for parts and labor coverage to the extent noted in theLabor HoursandMaterial Availabilitysections of this document.
Original Issue - September 11, 2019 SL680A-25-17
Revision A - November 21, 2019 Page 1 of 2
Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-5800
This document contains technical data and is subject to U.S. export regulations. This information has been exported from the United States in accordance with export administration regulations. Diversion contrary to U.S. law is prohibited. ECCN: 9E991
SL680A-25-17
Page 2 Revision A - November 21, 2019
Citation
OWNER ADVISORY
SL680A-25-17
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 theMaterial Availabilitysection of this document.
Labor Coverage: Textron Aviation-owned and Textron Aviation-authorized Service Facilities rated to perform maintenance on the specific model of Cessna Aircraft may submit a claim for the labor necessary to accomplish this service document as defined in theLabor Hourssection 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.
Please submit your claim form online atww2.txtav.com/Partsor email the completed Textron Aviation Claim Form towarranty@txtav.com. If submitted on-line a Return Authorization will be provided. If a paper claim is submitted your claim will be entered into the system and a Return Authorization will be sent to you.
The Return Authorization must accompany any required return parts (seeMaterial Availability), to the point of purchase.
Parts to be returned to Textron Aviation Parts Distribution should be forwarded to: Textron Aviation Parts Distribution
Warranty Administration 285 South Greenwich Road Bldg B89, Docks 1-4 Wichita, KS 67206 USA
Expiration: September 11, 2021
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 www.txtavsupport.com to register.
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 2
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC.
TABLE OF CONTENTS
1.0
PLANNING INFORMATION ... 3
2.0
MATERIAL INFORMATION... 5
3.0
ACCOMPLISHMENT INSTRUCTIONS ... 7
3.1
Service Work Procedures ... 7
3.1.1
Snap Ring Location: ... 7
3.1.2
Snap Ring Replacement Procedures: ... 9
3.1.3
Modification ID Label Installation Procedures: ... 9
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 3
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC.
1.0
PLANNING INFORMATION
A. Effectivity, Eligibility
(1) This service bulletin (SB) applies to the Millennium Concepts Model 2050 crew seating system. The seats eligible for this modification are identified by the following serial numbers:
C000001 thru C000315 B. Summary and Purpose
(1) Summary: The snap ring which secures the seat pan tilt pivot block fitting, may become disconnected and allow the front of the seat pan to drop under certain conditions.
(2) Purpose: This service bulletin replaces the original snap ring with a new design snap ring, to prevent it from separating from the groove.
(3) Execution: The service bulletin work is recommended to be conducted after removal of the seats from the aircraft.
C. Compliance
(1) Compliance with this service bulletin is recommended. This is required to ensure the seats remain fully operable and in compliance with the TSO. (2) Compliance is recommended at the following times, as applicable:
On condition; or
At the next scheduled removal of the seats, but not to exceed 1 year from date of this SB
Articles in stock or work in progress (WIP) should be reworked prior to delivery
(3) The SB is approved under the authority of the TSO holder. The design configuration is also TSO approved.
D. Airworthiness Directives
There are no airworthiness directives (AD) associated with this service bulletin. The initial released as well as the current revision B have been coordinated with the FAA ACO.
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 4
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC.
E. Manpower
TABLE 1 APPROXIMATE MODIFICATION TIME
Approximate man hours
(hr:min)
Snap Ring Replacement 0:20 Installation of SB placard
0:10 Inspection of service work
TOTAL MAN HOURS
PER SEAT 0:30
J. Weight and Balance
(1) Weight Change: Non significant (2) Moment Change: Non significant K. Electrical Load Data
Not applicable. L. Software
Not applicable. M. References
Not applicable N. Publications Affected
Not applicable
O. Interchangeability of parts (1) Not applicable
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 5
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC.
2.0
MATERIAL INFORMATION
A. Material – Price and Availability
This service bulletin the associated modification kits are available free of charge for affected seats.
B. Material
(1) Modification Kit: P/N MKIT2050-252002B
Note: Each seat requires one kit.
Figure 2.1 New Snap Ring
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 6
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC. Table 2 Modification Kit, P/N MKIT2050-252002B
New Part No. Description Qty Fig.
VHL-120-X-S02 Snap Ring 2 Figure 2.1
9000-1130008-001 MODIFICATION ID LABEL 1 Figure 2.3 9000-1130008-003 MODIFICATION ID LABEL PROTECTIVE FILM 1 Figure 2.3
Figure 2.3 Modification ID Label and Protective Film Location
The new SB label should be installed on the bottom side of the composite seat pan as close to the existing seat ID label as space allows.
C. Tools
Note that some tools are optional. (1) Small needle-nosed pliers (2) Small flat head screwdriver (3) Small pick tool
D. Warranty Statement
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 7
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC.
3.0
ACCOMPLISHMENT INSTRUCTIONS
Modifications should only be carried out by a mechanic/technician experienced with aircraft mechanical assemblies.
It is recommended that the mechanic / technician review the entire service bulletin before commencing with the modification.
Any questions relating to this service bulletin should be directed to eng@millennium.aero.
3.1
Service Work Procedures
3.1.1 Snap Ring Location:
A. The subject snap rings are located under the front of the seat pan. There is one on each side. See Figure 3.1 and Figure 3.2 below which identify the snap ring.
Figure 3.1 Snap Ring Location
Two locations per
seat, under seat pan
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 8
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC. Figure 3.2 View Looking Under Seat Pan (Snap Ring)
VH-112-S02
Snap Ring to be
replaced with
VHL-120-X-S02
Seat Frame
Pivot Block
Fitting
Gas Lock
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 9
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC.
3.1.2 Snap Ring Replacement Procedures:
A. It may be possible to replace the snap ring with the seat installed in the aircraft; however, access will be improved if this work is performed outside the airplane (i.e. seat not installed).
B. Remove the old snap ring (VH-112-S02) out of the groove by using a small flat head screwdriver and follow the steps in Figure 3.3 to work the ring out of actuator shaft.
Figure 3.3 Snap Ring Removal
C. Install a new Snap Ring (VHL-120-X-S02) in the reverse method used to remove the old snap ring.
D. Check the installation by pulling firmly inboard on the Pivot Block or Actuator.
3.1.3 Modification ID Label Installation Procedures:
A. Install 9000-1130008-001 Modification ID Label adjacent to the existing TSO ID label approximately as shown in Figure 2.3 and apply the 9000-1130008-003 Protective film over the new label, approximately centered.
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 10
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC.
4.0
QUALITY ASSURANCE
A. The service bulletin must be carried out under the direction of a quality assurance department.
B. Upon completion of this service bulletin, approval for release per 14 CFR 43.5 shall be appropriately documented.
C. The Service Bulletin Execution Form must be completed, signed and returned to Millennium when the Return to Service Approval has been completed.
Model 2050 Seating System: Seat Pan Tilt Snap Ring Replacement
Doc. SB2050-25-20-02
Rev. B
Date 9/23/2019
Service Bulletin Page 11
THIS DOCUMENT CONTAINS INFORMATION OF A PROPRIETARY NATURE AND SHALL NOT BE TRANSMITTED, REVEALED, OR DISCLOSED TO ANYONE WITHOUT THE EXPRESS WRITTEN PERMISSION OF MILLENNIUM CONCEPTS, INC. ADDITIONALLY, USE
OF THE INFORMATION IS PROHIBITED EXCEPT WHEN EXPRESSLY AUTHORIZED BY MILLENNIUM CONCEPTS, INC. Mail, E-mail or Fax copy of this executed form to:
Millennium Concepts, Inc. Attention: Document Control 9050 W. Monroe Circle Wichita, KS 67209 United States of America
Email: DocControl@millennium.aero PH: +1 (316) 821-9300
FAX: +1 (316) 821-9384
Organization: Work
Authorized by: (name, title, date)
Prepared by:
(name, title, date)
Comments:
List serial numbers of modified units:
Seat Serial No(s). Aircraft Serial No.
Modification / work accomplished by:
Technician Date
Modification / work inspected by:
