航空 发表于 2011-4-19 08:15:21

CFM T12 Sensor Failure

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航空 发表于 2011-4-19 08:15:34

T12 Sensor<BR>Failure<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 2<BR>History<BR>• Several T12 failures experienced since EIS<BR>- Operational impact: thrust fluctuation<BR>- Internal wire rupture<BR>- Both sources affected<BR>- P/N 0154GL5 (Rosemount)<BR>- P/N RP198-00 (Auxitrol).<BR>- Connector welding bead rupture<BR>- P/N RP198-00 only<BR>• Improved T12 sensors released<BR>- SB 73-080, Rosemount source, cat 7, June 00<BR>- P/N 0154GL5 for S/N YA043001 and up.<BR>- SB 73-085, Auxitrol source, cat 6, Feb. 01<BR>- P/N RP198-01<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 3<BR>Background<BR>• 4 post SB 73-085 T12 sensor failures<BR>- P/N RP198-01 only (Auxitrol)<BR>- 2 air turn backs due to N1 fluctuations<BR>- Connectors separated from sensor body<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 4<BR>Investigations<BR>• Connectors ruptured at weld bead location<BR>- Insufficient weld bead depth, does not conform to<BR>specification<BR>• Connector welding process audit<BR>- TIG welding process performed<BR>- Welding machine parameters caused variation in weld<BR>bead depth<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 5<BR>0.4/0.48mm (0.6mm mini specified)<BR>Sensor Body<BR>Weld bead<BR>Connector<BR>Connector Welding<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 6<BR>Investigations - Conclusions<BR>• Entire RP198-01 production suspected<BR>- 304 sensors<BR>- S/N YC135800 to YC136096<BR>- S/N YC136115 to YC136119<BR>- S/N YC136133 and 136134<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 7<BR>• At Vendor’s production level<BR>- TIG welding process improvements validated Jan. 02<BR>- Welding jig refined to ensure repeatability<BR>- Setting parameters modified<BR>- Rework qualified on T12 sensor assembly Jan. 02<BR>- Re-welding of connector<BR>- Improved production jig and welding parameters<BR>used<BR>Corrective Actions<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 8<BR>• Field plan<BR>- Retrofit of RP198-01 sensors<BR>- Repair applied to returned parts<BR>- Specific part identification<BR>- SB targeted end April 02<BR>Corrective Actions

kinran 发表于 2011-6-4 23:03:29

:victory: :victory:

bocome 发表于 2011-7-31 05:11:21

CFM T12 Sensor Failure

控制初学者1 发表于 2016-9-5 20:24:43

CFM T12 Sensor Failure
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