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--- projects:challenger604:boostpumpswitchtroubleshooting [2022/09/14 01:20]
dwheele [Challenger 605 Fuel Distribution Schematic]
+++ projects:challenger604:boostpumpswitchtroubleshooting [2022/09/14 05:21] (current)
dwheele [Conclusion]
@@ Line 9: / Line 9: @@
   * Don has a spare relay on hand
   * Replacement pump costs $9000
-  * Don bought replacement switch 9/11/2022
+  * Don bought replacement switch 9/11/2022, to be delivered to Duncan, who will install it.
+===== Conclusion ======
+We removed the fuel assembly in the cockpit, and measured ohms between pin underscore-C and underscore-D. On the Right Hand Fuel Boost Switch, it measured about 600 ohms and the same spot on the LH switch it measured about 16 ohms. As a comparison, we measured other contacts, such as B to underscore-Z, and it measured 0.5 ohms.
+It appears that indeed the **RH Fuel Boost Switch needs to be replaced, and the LH switch should also be replaced.** This agrees with Don's input that the LH switch did cause one failure, but otherwise the RH switch had the faulty result.
@@ Line 52: / Line 58: @@
 I don't know how hard it is to get to the back of that switch so I can measure.
+------------
+It turns out that to measure between CC and CNO, it is required to measured at the nearby Canon plug underscore-c to underscore-d.
 ===== Information ======
@@ Line 58: / Line 70: @@
 ==== Challenger 605 Fuel Distribution Schematic ====
 {{:projects:challenger604:challenger605fueldistributionschematic.jpg|Challenger 605 Fuel Distribution Schematic}}
+  * 1 - L (R) Collector Tank
+  * 2 - L (R) Boost Pump / APU Boost Pump
+  * 3 - L (R) Main Ejector
+  * 4 - L (R) Scavenge Ejector
+  * 5 - L (R) Transfer Ejector
+  * 6 - L (R) Transfer Ejector Float Valve
+  * 7 - L (R) Engine Fuel SOV
+  * 8 - L (R) Wash Filter
+  * 9 - L (R) to Aux X_Flow Valve
+  * 10 - Gravity Crossflow Valve
+  * 11 - (not shown)
+  * 12 - (not shown)
+  * 13 - APU SOV
+  * 14 - APU Neg-G SOV
   * A - L (R) P Switch = MAIN EJECTOR FAIL (Status MSG)
@@ Line 68: / Line 95: @@
   * H - Engine-Driven Pump
-{{ :projects:challenger604:ds6213-standard-eu-en.pdf |Challenger 605 Fuel Diagrams}}
+{{ :projects:challenger604:cl605-fuel_system.pdf |Challenger 605 Fuel System Diagrams}}
 {{ :projects:challenger604:wm28-21-00-102_001.pdf |Fuel Distribution Electrical Schematic}}

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