DHC8 mod 8-2781
03-17-2012, 12:34 AM
#12
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Joined APC: Mar 2012
Posts: 41
In 2000-ish hours of DHC-8 Classic flying have experienced 3 full-blown hydraulic failures. One was a left inboard flap actuator that burst during attempted extension on base leg to a very short runway (flaps didn't budge); resulted in a missed approach and diversion to a longer runway followed by zero-flap landing. Got the roll spoiler hyd lights first, followed by everything else including #1 HYD ISOL VLV. By the time we got towed to the gate and MX had a look at it, the hyd quantity gauge indicated zero. MX concurred and said there was almost nothing left in the #1 system. All the lights stayed on to the gate.
Second was a catastrophic KABOOM during gear extension sequence (gear thankfully came down first). Smae deal, spoiler hyd lights first followed by the rest including #2 HYD ISOL VLV. Went ahead and landed it as the gear was already down and the lack of nosewheel steering was not going to be a problem (it was a big airport). According to the hyd quantity gauge and MX, we still had a touch of fluid in the rudder circuit, as advertised; all the lights stayed on to the gate.
Third was a gear door actuator that exploded on the ground during an engine start (gear doors were open before start so system was attempting to close them); all the lights came on and stayed on, no idea how much fluid was left. We were the only ones on board and it started smoking pretty bad as the Skydrol sprayed up onto the engine nacelle, so we shut it down, ran the checklist, got out, and ran away. Fire brigade and the MX boys took care of the rest. Was a huge puff of smoke, but otherwise no big deal.
Like the previous poster indicated the isolation valve is a simple float switch; unless the reservoir fills back up it will stay on. I concur that your sim is not doing the right thing. Miss the Dash, it was a great airplane (when it worked).
Second was a catastrophic KABOOM during gear extension sequence (gear thankfully came down first). Smae deal, spoiler hyd lights first followed by the rest including #2 HYD ISOL VLV. Went ahead and landed it as the gear was already down and the lack of nosewheel steering was not going to be a problem (it was a big airport). According to the hyd quantity gauge and MX, we still had a touch of fluid in the rudder circuit, as advertised; all the lights stayed on to the gate.
Third was a gear door actuator that exploded on the ground during an engine start (gear doors were open before start so system was attempting to close them); all the lights came on and stayed on, no idea how much fluid was left. We were the only ones on board and it started smoking pretty bad as the Skydrol sprayed up onto the engine nacelle, so we shut it down, ran the checklist, got out, and ran away. Fire brigade and the MX boys took care of the rest. Was a huge puff of smoke, but otherwise no big deal.
Like the previous poster indicated the isolation valve is a simple float switch; unless the reservoir fills back up it will stay on. I concur that your sim is not doing the right thing. Miss the Dash, it was a great airplane (when it worked).
Last edited by HighTailN2Pipes; 03-17-2012 at 12:55 AM.
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