Stemme SB P062-980082: Revision 01, text

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DOC.NO =TEMN SERVICE BULLETIN P062-980082 REVISION: 01 EASA.21J.250 PAGE 1 OF 3 ATA28 - Fuel - Aircraft Fuel System The technical content of this document is approved under the authority of DOA ref. EASA.21J.250.

SUBJECT:

Replacement of copper sealing ring P/N D7603-12016-CU by FKM (Viton®) sealing ring P/N 831984 of screw-in adapter AFFECTED AIRPLANES:

Type: STEMME S10 Variant: STEMME S12 TCDS: EASA.A.054, G06CE (FAA) and foreign Type Acceptance Serial Numbers: 12-001 up to and included 12-060 TIME OF COMPLIANCE:

1. Immediately, if fuel leakage is detected during daily inspection / pre-flight check

2. At the next annual inspection or engine 100h-inspection REASON:

Due to possible leakage between connecting parts of the fuel system, the copper sealing ring P/N D7603-12016-CU in the pump set P/N 128201 and drainer complete P/N 128207 assemblies must be replaced by a FKM (Viton®) sealing ring P/N 831984 that will be integrated into the screw-in adapter.

ACTIONS:

Action 1 - Preparation Drain center fuselage tank until it is empty.

Attention: Remaining fuel can leak out during disassembling of fuel system components.

Action 2 - Replacement in pump set P/N 128201 assembly The pump set P/N 128201 is located at the front left area of the middle fuselage. It can be serviced from below when the main landing gear is extended.

The first copper sealing ring P/N D7603-12016-CU is installed between the screw-in adapter 1 P/N 831099 (see Figure 1) and the fuel distributor P/N 128229. At first unscrew the union nut of the fuel shut off valve pipe P/N 128204. Then unscrew and remove the screw-in adapter P/N 831099 and the copper sealing ring P/N D7603-12016-CU from the fuel distributor P/N 128229.

Insert the new FKM (Viton®) sealing ring P/N 831984 into the unmounted adapter P/N 831099 and screw both parts back to the fuel distributor P/N 128229. Secure it with Loctite 243 (A061) according to drawing P304-128201/06. Finally screw the union nut of the fuel shut off valve pipe P/N 128204 back onto the screw-in adapter P/N 831099.

prepared signature verified signature Date of issue supersedes Office of Asceness Date of approva revision Rodenacker Lengert 15.07.2025 30.04.2025 мРІ 15.07.2025 ORM FEB-062, DATE OF ISSUE: 15JUL2024

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DOC.NO STEMME SERVICE BULLETIN P062-980082 EASA.21J.250 REVISION: O PAGE 2 OF 3 The second copper sealing ring P/N D7603-12016-CU is installed between the screw-in adapter 2 P/N 831099 (see Figure 1) and the fuel distributor P/N 128228. At first unscrew the union nut of the fuel tank pipe P/N 128203. Then unscrew and remove the screw-in adapter P/N 831099 and the copper sealing ring P/N D7603-12016-CU from the fuel distributor P/N 128228. Insert the new FKM (Viton®) sealing ring P/N 831984 into the unmounted adapter P/N 831099 and screw both parts back to the fuel distributor P/N 128228. Secure it with Loctite 243 (A061) according to drawing P304-128201/06. Finally screw the union nut of the fuel tank pipe P/N 128203 back onto the screw-in adapter P/N 831099.

34 | 11AB-M08 5 128237 Screw-in Adapter 1 4 128236 33 831099 * 27 10M-131 29 E-330 46 E-331 32 | M415 " 27 10M-181 " 25 D7603-12016-CU Ring 1 Copper Sealing 3 128229 30 | 10AB-TR43 (13 200141- 10 128242 _ 30 10A6-TR43 43 E-02 29 E-330 L1 | 832155 31 E-18 7 128239 (40 932153 (9 128241) 28 M518 agen sind nicht moliste 27 10M-181 Screw-in Adapter 2 33 831099 11 128243 25 D7603-120°6-CJ 12 200140 28 M618 * 30 10AB-TR43 Copper Sealing 30 10AB-TR43 -29 E-330 Ring 2 (29 |E-330 - 4 | 128236 46 E-331 2 | 128228 27 10M-181) 22 M415 14 11AB-M02 34 11AB-M08 27 / 101-181) * 6 128238 Figure 1: Pump Set assembly (currently installed version) Action 3 - Replacement in drainer complete P/N 128207 assembly The drainer complete P/N 128207 is located at the main landing gear bay. It can be serviced from below when the main landing gear is extended.

The copper sealing ring P/N D7603-12016-CU is installed between the screw-in adapter P/N 831099 and the drainer attachment P/N 128271. At first unscrew the union nut of the drainer pipe P/N 200324. Then unscrew and remove the screw-in adapter P/N 831099 and the copper sealing ring P/N D7603-12016-CU from the drainer attachment P/N 128271. Also unmount the drainer P/N 10AB-12 and the drainer attachment P/N 128271 from the sheet metal part P/N 128254. The drainer P/N 10AB-12, O-ring P/N M511 and nut P/N D936-20 can be reused if they are not worn. The drainer attachment P/N 128271 will be replaced by the new part P/N 128282. Now insert the new FKM (Viton®) sealing ring P/N 831984 into the unmounted adapter P/N 831099 and install it together with the drainer P/N 10AB-12, O-ring P/N M511, nut P/N D936-20 and new drainer attachment P/N 128282 according to drawing P304-128207/02. Finally screw the union nut of the drainer pipe P/N 200324 back onto the screw-in adapter P/N 831099.

FORM FEB-062, DATE OF ISSUE: 15JUL2024

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DOC.NO SERVICE BULLETIN P062-980082 EASA.21J.250 REVISION: 01 PAGE 3 OF 3 Screw-in Adapter Copper Sealing Ring 3 831099) 5 D7603-12016-CU (D936-20) 1 128271 Drainer Attachment 2 128254 10AB-12) 8 M511 Figure 2: Drainer complete assembly (currently installed version) MATERIAL AND DOCUMENTS:

Material:

- Installation Kit SB 980082 - Fuel system 1x P/N 128284 Documents:

- Pump Set assembly

- Drainer complete assembly

- Aircraft Maintenance Manual S12 P304-128201/06 P304-128207/02 L500-912820 latest revision L500-912850 latest revision MASS AND BALANCE:

Not affected.

REMARKS:

For any question concerning the technical content of the requirements in this Service Bulletin, please contact: STEMME GmbH, Flugplatzstrasse F2 Nr. 7, 15344 Strausberg,

GERMANY Telephone: +49 3341 3612 0, FAX: +49 3341 3612 30, E-mail: airworthiness[at]stemme.com FORM FEB-062, DATE OF ISSUE: 15JUL2024