标题: CFM Oil Temperature Sensor Issue [打印本页] 作者: 航空 时间: 2011-4-15 19:18:56 标题: CFM Oil Temperature Sensor Issue
作者: 航空 时间: 2011-4-15 19:19:09
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 Oil Temperature Sensor Issue February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 Oil Temperature Sensor Issue Components & Accessories Background • Five commanded IFSD’s following Low Oil Pressure Warning / Low Oil Qty • Ground inspection showed oil temperature sensor separated from housing – All the oil expelled from the open port • Event engines age less than 850 cycles since new • Events led to extensive engine damages (bearings failure) – Low oil pressure warning delayed due to invalid PEO February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 Root Cause • TEO Sensor with attachment bolts and self locking inserts disengaged all together and holes threads in housing found sheared • Insert over torqued during assembly (or maintenance) damage to the insert – Engine oil pressure cyclic load on the probe shearing of the insert threads and to back off the probe – lack of robustness of the insert design sensitive to over torque Insert Bolt Sheared threads Root Cause Understood = Insert Sensitive to Over Torque Oil Temperature Sensor Issue Components & Accessories February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 Production Final Fix • Mechanical Fix A new housing design, more robust, new insert definition has been implemented – With this new insert, six (6) threads are engaged instead of three (3) on the current housing. – The bolt becomes the weak link in this assembly (demonstrated by test) – On new production engines since May 2001 (engine 88T-481 and up) SB 72-0298 issued 5 Jul 2001 • Software Fix Lower limit for PEO signals reduced to ensure low oil pressure warning activated in worst case scenario (sudden oil supply line open to ambient) – Introduced in 7BM1 software (1853M79P20) - S/B 73-0064, 31 Jul 2001 Oil Temperature Sensor Issue Components & Accessories February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5 In-Service Plan • Containment Plan CFM recommended Implementation of lockwire between probe and housing for engines having accumulated less than 1,000 cycles since new, or for those on which a maintenance action on the TEO Sensor had been performed – S/B 72-A0336 issued on 26 Jun 2001 CFM recommend implementation of lockwire on all field engines regardless of age – S/B 72-A0336 to be revised Target date Mar 2002 Oil Temperature Sensor Issue Components & Accessories February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6 In-service Final Fix Plan CFM recommends mechanical final fix implementation during engine shop visit to replace the interim fix – This can be done by Installation of the new housing configuration (P/N 805) with longer inserts Installation of a current/reworked housing (P/N 804 -> P/N TBD) » Valid for a non damaged housing » Rework to be released in Mar 2002 » S/B 72-A0336 to be revised in Mar 2002 Oil Temperature Sensor Issue Components & Accessories作者: 979199501 时间: 2011-4-16 00:01:07 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 23:17:33
