HMU/MSV/BSV Position Faults

航空发表于 2011-4-16 11:37:56

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航空发表于 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

junbok 发表于 2011-5-7 23:36:58

谢谢楼组！

kinran 发表于 2011-6-4 22:24:37

不错不错:victory:

bocome 发表于 2011-7-31 05:27:17

HMU/MSV/BSV Position Faults

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HMU/MSV/BSV Position Faults