标题: HMU/MSV/BSV Position Faults [打印本页] 作者: 航空 时间: 2011-4-16 11:37:56 标题: HMU/MSV/BSV Position Faults
作者: 航空 时间: 2011-4-16 11:38:11
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 HMU/MSV/BSV Position Faults February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 • Main Staging Valve (MSV) Faults The MSV Controls the DAC Staging Between 20/25 and 20/20 The MSV Is Always Closed Fault Is No-Dispatch The MSV is Closed when De-energized Customers are Experiencing ATOs in Revenue Service – The MSV Is Always Closed (73-x102n) – More Than 90% of the Failures are Reported on Channel-B (x=2) • Burner Staging (BSV) Valve Faults The BSV Controls the SAC to run 10 Nozzle or 20 Nozzle The BSV Is Always Open Fault Is Short Time Dispatch The BSV is Open when De-energized Customers are Experiencing BSV Faults in Revenue Service – The BSV Is Always Open (73-x064n) – More Than 90% of the Failures are Reported on Channel-B (x=2) The Same HMU Solenoid is Used for Both BSV and MSV HMU/MSV/BSV Position Faults February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 • EEC Solenoid Driver Specification Output current for the solenoid driver is 330 ma +/- 30 ma EEC solenoid driver output range is 300 to 360 ma EEC solenoid driver output is a constant current – ATP results show EEC solenoid output driver set to 330 ma • Honeywell Solenoid Test Results (Solenoid Testing Only) BECW1303 BECW0617 BECW0446 85oF 300oF 85oF 300oF 85oF 300oF (29oC 149oC) (29oC 149oC) (29oC 149oC) Coil-A 264 271 265 268 274 274 Coil-B 270 271 280 283 285 289 Channel-B Solenoid Requires a Higher Pull-in Current Than Channel-A HMU/MSV/BSV Position Faults February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 • CFMI Test Results From Evendale Test Facility (DAC Configuration) SAS HMU BECW1650 – BSV/MSV solenoid pull-in current – ~300 ma pull-in current required at 120oF fuel temperature – ~339 ma required to energize the solenoid at 170oF fuel temperature – Solenoid response has been observed to be delayed as much as 5 sec – Further Testing Required at Honeywell to determine worst case • Channel-B Requires Higher Pull-in Current Than Channel-A MSV/BSV Solenoid Windings are Axially Mounted – Channel-A is the inner winding – Channel-B is the outer winding • Configuration option available to address BSV Always Open Faults Implement Service Bulletin 73-0054 – Disable BSV – HPTACC Faults Become Economic Rather Than No-Go CFMI and Honeywell to Define Go-Forward Plan for MSV Faults HMU/MSV/BSV Position Faults作者: junbok 时间: 2011-5-7 23:36:58
