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MSB1121-140 Page 1 of 4 I GROB 03 Dec. 2013 AIRCRAFT Replaces Issue: - SERVICE BULLETIN NO. MSB1121-140 I. TECHNICAL DETAILS
1.1 Category:
Mandatory Note: GROB issues Service Bulletins of category Mandatory (MSBs), if the information or instructions have a safety intent either related to design or conformity and to publish revisions of manuals (AFM, AMM, IPC). However, according to Article 20(1) of Regulation (EC) No. 216/2008, only EASA may issue mandatory information, in the form of an Airworthiness Directive (AD), in order to react to a given safety problem.
Service Bulletins classified Mandatory issued by GROB's design organisation do not have a legally mandatory character equivalent to an AD, cannot have enforcement implications and, therefore, serve as information or instruction by GROB only. This also applies to cases where a Service Bulletin is published in anticipation of an AD.
Note: This service bulletin is issued in anticipation of an AD. Issue of an AD will not necessarily lead to revision of this service bulletin.
1.2 Airplanes affected:
G 120A 85001-85007, 85026-85056, 85058 G 120A-I all S/N
1.3 Time of Compliance:
Before next flight.
1.4 Subject:
ATA-Code: 55-20 Elevators and Trim tab Inspection of elevator flanges 1121-140 MSB, Inspection of elevator flanges. doc G 120A/A-I Grob Aircraft AG, Lettenbachstrasse 9, D-86874 Tussenhausen-Mattsies
MSB1121-140 Page 2 of 4 GROB 03 Dec. 2013 AIRCRAFT Replaces Issue: - Reason:
Grob received a report from a fleet operator of G 115E that an elevator flange P/N 115E-2038 was found cracked.
Confirmed Crack Post Dye Penetrant Testing Photo No 2 The design of the G 120A / A-l is principally similar. As a precautionary action a one-time inspection is mandatory. Any finding has to be reported to Grob with aircraft S/N and flight hours. Furthermore, the maintenance manuals are amended to introduce specific regular inspection in terms of repetitive action.
This Service Bulletin is intended to prevent an unsafe condition. The configuration of the aircraft is not affected by this Service Bulletin.
1.6 Concurrent documents:
Corresponding AMM and IPC G 120A (S/N 85001-85007):
G 120A-C (S/N 85026 on):
G 120A-F (S/N 85035-85052):
G 120A-I:
TR 05-22, TR 05-23, TR 55-01 TR 05-15, TR 05-16, TR 55-01 TR 05-11, TR 55-01 TR 05-29, TR 55-01
1.7 Approval Note:
The technical content of this document is approved under the authority of EASA Design Organization Approval No. EASA.21J.030.
1121-140 MSB, Inspection of elevator flanges.doc G 120A/A-I Grob Aircraft AG, Lettenbachstrasse 9, D-86874 Tussenhausen-Mattsies
MSB1121-140 Page 3 of 4 • GROB 03 Dec. 2013 AIRCRAFT Replaces Issue: -
1.8 Accomplishment/ Instructions
1.8.1 Make sure that the aircraft is safe for maintenance, refer to AMM chapter 10-10.
1.8.2 Remove access panels P/N 120A-2037 and 120A-2038, refer to AMM chapter 52-40.
1.8.3 Inspect elevator flanges P/N 120A-3561.20(A) and 120A-3562.20(A) visually for cracks.
Use a mirror or a borescope.
1.8.4 If cracks are found, replace flange before next flight, refer to AMM chapter 55-20. If you think that there are cracks, replace flange before next flight or perform Dye Penetrant Check as follows:
Remove affected elevator, refer to AMM chapter 55-20.
Remove affected elevator flange from elevator.
Perform Dye Penetrant Check on elevator flange.
If no cracks are found: Clean flange and install flange to elevator.
If cracks are found: install new flange to elevator.
Install elevator, refer to AMM chapter 55-20.
1.8.5 Install access panels P/N 120A-2037 and 120A-2038, refer to AMM chapter 52-40.
1.8.6 Release aircraft into service according to national requirements.
1.8.7 Report any finding to Grob Aircraft, Product Support, refer to section III.
1.9 Repetitive Actions Repeat inspection every 100FH, refer to the corresponding TRs, as mentioned in 1.6, or subsequent revisions of the AMM.
II. PLANNING INFORMATION
2.1 Weight and CG N/A
2.2 Material and Availability N/A
2.3 Special Tools N/A
2.4 Labor costs N/A
2.5 Reference documents Corresponding AMM and IPC
2.6 Credit N/A 1121-140 MSB, Inspection of elevator flanges. doc G 120A/A-I Grob Aircraft AG, Lettenbachstrasse 9, D-86874 Tussenhausen-Mattsies
MSB1121-140 Page 4 of 4 • GROB 03 Dec. 2013 Replaces Issue: - AIRCRAFT III. REMARKS The instructions in paragraph 1.8 have to be accomplished and certified in the logbook by authorized staff:
- in EASA countries according to Article 5 VO EG 2042/03 (VO EG 1056/2008) Appendix III - Part 66
- in non-EASA countries according to national regulations with respect to maintenance.
If you have sold your aircraft in the meantime, we kindly ask you to forward this information to the new owner and to provide us with the name and address of the new owner as well as with the respective serial number.
For questions and assistance please contact:
Product Support, phone: +49 8268 998105 fax: +49 8268 998200 e-mail: productsupport@grob-aircraft.com 1121-140 MSB, Inspection of elevator flanges doc G 120A/A-I Grob Aircraft AG, Lettenbachstrasse 9, D-86874 Tussenhausen-Mattsies