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--- projects:challenger604:boostpumpswitchtroubleshooting [2022/09/11 02:08]
dwheele [Don's Videos]
+++ 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, 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.
 ===== Bombardier Notes regarding Boost Pump, from PDF downloadable from WWW. =====
@@ Line 39: / Line 47: @@
   * Check pump grounds
-  * Failure to measure pressure could cause strange indication because one side pressure can cause other side's pump to operate
+  * I'm 80% sure that the problem is the RH Boost Pump Switch, between contacts CC and CNO.
+If it were the relay, then the failure would be just as likely to occur when the RH or LH switch is down.
+You didn't explain what happens if you push both LH and RH boost pump switches in. I'm thinking that all of your problems go away.
+The CNO contact on the boost pump switch is directly connected to the relay coil. When you energize and de-energize a circuit with a coil like that, it makes an inductive spark. Usually, they place a diode in parallel to block such sparks. The diode shown is not connected in parallel.
+I can test to see if I am right be measure with my voltmeter between CC and CNO. It should always measure zero volts if the contact is good. But if a higher value shows up, that means that the volts from the circuit break is not making it to the relay.
+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 47: / 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 56: / Line 94: @@
   * G - L (R) FUEL XFLOW SOV OPEN (Abnormal MSG)
   * H - Engine-Driven Pump
+{{ :projects:challenger604:cl605-fuel_system.pdf |Challenger 605 Fuel System Diagrams}}
 {{ :projects:challenger604:wm28-21-00-102_001.pdf |Fuel Distribution Electrical Schematic}}
@@ Line 61: / Line 101: @@
 ===== Don's Videos =====
-  * {{ :projects:challenger604:messages_0_2_.3gpp |LH Switch IN-OP, RH Switch pump Light On. Push LH Switch On, RH Light On - Good, task msg. gone}}
+  * {{ :projects:challenger604:messages_0_2_.3gpp |LH Switch IN-OP, RH Switch pump Light On. Push LH Switch, LH Light On - Good, task msg. gone}}
-  * {{ :projects:challenger604:messages_0_3_.3gpp |Engage RH Switch On, LH Light IN-OP }}
+  * {{ :projects:challenger604:messages_0_3_.3gpp |LH lights off, RH light IN-OP, Engage RH Switch On, after 1 second RH pump light On, after 3 more seconds, LH light IN-OP }}
-  * {{ :projects:challenger604:messages_0.3gpp |RH Switch In, LH Switch Out, RH Light On, LH Light On, then after 15 seconds IN-OP light On}}
+  * {{ :projects:challenger604:messages_0.3gpp |LH IN-OP light On, RH pump light On, RH Switch In, LH Switch Out, (not pictured: LH boost pump was on then after 15 seconds LH IN-OP light On, waiting for LH boost pump to come on (it didn't))}}
-  * {{ :projects:challenger604:messages_0_4_.3gpp |After 75 seconds, RW Switch In, LH Switch Out, RH Pump Light On, LH Pump Light On, Msg Removed}}
+  * {{ :projects:challenger604:messages_0_4_.3gpp |After 75 seconds, RH Pump Light On, LH Pump Light On, RW Switch In, LH Switch Out, Msg Removed}}
   * {{ :projects:challenger604:messages_0_5_.3gpp |LH IN-OP Light On, RH IN-OP Light On, Push LH Switch In, both IN-OP lights go Out, both pump lights go On - "Operation Normal"}}

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