航空 发表于 2011-4-19 08:16:03

CFM EMCD Failure

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航空 发表于 2011-4-19 08:16:15

EMCD<BR>Failure<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 2<BR>EMCD System<BR>Visual Indicator<BR>Master Chip Detector<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 3<BR>• Reports of MCD contamination not setting Visual Indicator<BR>pop-out<BR>- P/N: 301-779-401-0<BR>- Vendor: IN-LHC (Vendor P/N: 125A3)<BR>- Visual indicator TSN/CSN= 3817/4756<BR>Fleet Experience<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 4<BR>Interim Field Plan<BR>• On-wing EMCD system inspection<BR>- Inspection SB 72-0414, cat 2, issued Oct. 2001<BR>-On-wing procedure to check EMCD system (Magnet Chip<BR>Detector and Visual Indicator) functionality<BR>- To be performed at first opportunity then every “A” check<BR>- Inspection task 79-20-00-C8 to be incorporated in MRB/MPD<BR>-MPD incorporation planned 4th qtr 2002<BR>- Aircraft MEL modification in process<BR>• Current SB 72-0414 report status<BR>- 14 removals vs 273 inspected<BR>- 10 confirmed defective<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 5<BR>Investigation At Vendor<BR>• Magnet piston wear root cause identified<BR>- Silica residue degrades Microflon coating<BR>- Silica residues inherent to sand blast cleaning prior to Microflon coating<BR>- Inappropriate anticorrosion oil applied during manufacturing<BR>Moving Magnet<BR>Piston<BR>Solenoid<BR>Area of wear<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 6<BR>Corrective Actions<BR>• Piston manufacturing audit performed<BR>- Deletion of anticorrosion mineral oil spray: Oct. 2001<BR>- From S/N YU061816<BR>- No substitute require<BR>- Affected population<BR>- Visual Indicators (927 units)<BR>- Manufactured from Sept. 97 to Dec. 01<BR>- From S/N 10375 to S/N YU061815.<BR>• CFM monitoring removals to assess further field actions<BR>- One high time Visual Indicator found stuck due to heavy piston<BR>wear.....not included in affected population<BR>CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 7<BR>• Objectives<BR>- Decrease spurious pop-outs<BR>- No Magnet Chip Detector change<BR>- Interchangeability not affected<BR>• Visual Indicator design changes<BR>- Desensitized...reduced electrical threshold from 2K to 130<BR>- 10 sec delay before setting pop-out<BR>- Improved pop-out reset device<BR>- Transparent cap push-to-reset<BR>• Production release targeted 3Q02<BR>New EMCD Design

kinran 发表于 2011-6-4 23:03:49

:victory: :victory:

bocome 发表于 2011-7-31 05:10:46

CFM EMCD Failure
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