February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 Electrical Harnesses February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 Background • Harness outer metallic braid found damaged at clamp location Investigation • Chafing occurred at clamp locations. • Clamp cushion wear due to vibration and allow harness braid to contact / wear against clamp • Issue identified at 6 different clamp locations in core compartment Most of the time when two branches are in the same clamp Corrective Action • New clamps design validated (P/N 649-411-981/990-0) Includes an additional cushion in between the clamp and the harness S/B 72-0285 targeted for Mar 2002 Electrical Harnesses CJ9 / CJ10 Chafing Issue February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 Repairs • On-wing temporary repair Valid up to harness shop visit Communicated to airlines through Jan 2001 fleet highlight • 2 improved on-wing repairs to be introduced in AMM: 1) Wrapping of the wear external braid with fiberglass insulting tape + adjunction of a thermal protective metal wire wrapped around the repaired area – To be released in AMM Feb 2002 rev. 2) Adjunction of two half cylindrical shelves secured by the clamps themselves – To be released in AMM Jun 2002 rev. • Shop repair developed Metallic outer braid or complete branch replacement – CMM to be updated Electrical Harnesses CJ9 / CJ10 Chafing Issue February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 Background • Numerous cases of TCC and T3 intermittent faults in-service • 60% sensors returned are not confirmed at vendor • Investigation showed oxidation/pollution on connectors pins side which could explain the intermittent faults Investigation • Deeper analysis shows Contaminant on pins identified as Si and Al oxides Pollution from high temperature sheath found on the connector sockets Flaking sheath found in backshells Sheath contain Si and Al oxides TCC (DAC) / T3 Connector Reliability Electrical Harnesses February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5 Pollution entries Deposit of flake of sheath High Temp. Sheath TCC (DAC) / T3 Connector Reliability Electrical Harnesses February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6 Corrective Action • Addition of Viton A heat shrinkable sleeve on the sheath Go-ahead decision 1Q 2002 Prod. intro 3Q 2002 TCC (DAC) / T3 Connector Reliability Also • Hermetic connector design under evaluation Electrical Harnesses February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 7 Background • Due to HPTACC thermocouple deletion on the SAC engines, the production harnesses will be modified and the TCC branch will be deleted from the CJ9 harness. • Engines with 7BM1 software can either be fitted with Old harness with TCC sensor OR Old harness with parking bracket OR New harness with plugged TCC orifice Action Plan • New harness design available. • New harness supporting Brackets design in process • Implementation in production targeted for 3Q 2002 TCC Branch Deletion Electrical Harnesses February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 8 Background • Wires chafing inside the 90° backshell of DP1102 connector (customer bleed) • SB 72-0262 issued 26 Jul 2000 Introduces new improved harness design (P/N 325-029-905-0) Provides old configuration (P/N 325-029-901/902-0) rework instructions • One case of chafing recently reported on other terminal Actions Plan • SB to be revised to extend rework capability the others backshells if needed Design review in process to verify need/effectiveness vs connectors MW0311 Harness Chafing Electrical Harnesses February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 9 Background • Component Maintenance Manuals concerning electrical harnesses have to be updated • Through WTT Telecon Customers put priority on: CMM 26-11-02 = Fire Detection Harnesses MW325, MW326 CMM 73-24-03 = Engine Harnesses J5, J6, J7, and J8 • Current plan CMM 26-11-02 Feb 2002 CMM 73-24-03 Apr 2002 • Overall activity plan targeted Feb 2002 CMM For Harnesses Electrical Harnesses作者: 979199501 时间: 2011-4-15 23:56:25 标题: 回复 1# 航空 的帖子
Arm
Proposed Switch Configuration
Current Double Throw
Proposed Single Throw
Run contact eliminated
Introduction Logistics
• CFMI/Boeing/Honeywell laun作者: kinran 时间: 2011-6-4 23:19:51
