2024-02 · NASA ASRS report 2087258
A320 flight crew reported a loss of nosewheel steering while parking into the gate for parking; and two ECAMS appearing. Engine #2 had already been shut down earlier. The flight crew shut down the remaining operating engine to get towed into the gate by a tug driver. The First Officer surmised that the problem may have potentially been caused from forgetting to turn on the Electric Hydraulic Pump after shutting down Engine #2 during taxi in.
While parking an A320 at Gate XX in ZZZ; the nosewheel steering stopped working halfway through the turn. We had shut down the left number 2 engine during the entrance to the north port in the ramp area. We told the Ramp we couldn't complete the turn and so a Ramper used a tug to tug us in the rear of the way. He had us shut down the remaining engine before attaching the tug and towing us in. During the loss of nosewheel steering; we got two ECAMS; HYD G RSVR LOW; and I believe the second was LOW G HYD PRESS; but the second ECAM cleared itself and I couldn't recall it to see it again. I followed the checklist instructions on the ECAM. While waiting for the Tug Driver; the First Officer said that the situation might have been caused by him forgetting to turn on the Electric HYD Pump when he shut down the number two engine during taxi in. I did not see him not turn the pump on and wasn't aware that the Electric HYD Pump wasn't on; as I was busy taxiing the aircraft; and turning on the Electric HYD Pump is part of the First Officer's flow after shutting down an engine during taxi. We were towed in without incident. I called Dispatch and Maintenance Control and made a maintenance logbook entry for the ECAM. A Maintenance Technician also came out to the plane and I spoke to him about what happened and he said it wasn't a big deal and there was no damage done to the aircraft.
During turning into assigned gate; the nose-wheel steering was lost. Captain stopped the aircraft and requested a tow in. Two ECAMs were shown; HYD G low pressure and HYD G low reservoir level. After shutdown of No. 1 engine; the HYD G low pressure ECAM cleared itself. Possible cause was the late turn on of the HYD Yellow ELEC pump after shutting down Engine 2 during taxi-in.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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