Narrative:

As the captain and I walked onto aircraft X; we immediately noticed multiple deferrals. Eight to be exact. As we sat down and starting preforming our preflight checks; we noticed the caution message; 'brakes park brk lo pr' and the triple brake indicator was reading an accumulator pressure of 0. Captain also noticed that the wrong pump was deferred. The yellow elec pump was supposed to be deferred; not the engine 2 pump. Captain then got on the phone with maintenance control to figure out the problem. Per SOP; we need to get ground crew clearance before energizing the yellow electric pump to recharge the brake accumulator. Fortunately for us; even more so for the fueler and mechanic; I went down to check that the area was clear. The fueler was standing right in front of the main landing gear door that was open. I immediately told him to move away from the door and to make sure he stayed clear of it. As I continued my walk around; I saw the mechanic standing on the open main landing gear door. Knowing that my captain was currently on the phone with maintenance control; and him having no idea that maintenance was still working on the plane; I was worried that maintenance control could have had him turn on/off hydraulic systems. I immediately yelled to the mechanic to get away from the area and ran upstairs to the cockpit to inform the captain not to perform any functions. The major issue today was that the mechanic was still working on the plane even though the red 'aircraft out of service' card was not in place. Specifically; he was servicing the yellow hydraulic system. The airplane was also signed off with an airworthiness for a heavy check that was performed the night/morning prior. Simply putting power to the aircraft with a switch in the wrong position could have had fatal consciences.

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Original NASA ASRS Text

Title: A321 flight crew reported issues with maintenance ground procedures.

Narrative: As the Captain and I walked onto Aircraft X; we immediately noticed multiple deferrals. Eight to be exact. As we sat down and starting preforming our preflight checks; we noticed the caution message; 'BRAKES PARK BRK LO PR' and the triple brake indicator was reading an accumulator pressure of 0. Captain also noticed that the wrong pump was deferred. The Yellow ELEC PUMP was supposed to be deferred; not the ENG 2 PUMP. Captain then got on the phone with maintenance control to figure out the problem. PER SOP; we need to get ground crew clearance before energizing the Yellow Electric pump to recharge the brake accumulator. Fortunately for us; even more so for the fueler and mechanic; I went down to check that the area was clear. The fueler was standing right in front of the main landing gear door that was open. I immediately told him to move away from the door and to make sure he stayed clear of it. As I continued my walk around; I saw the mechanic standing on the open main landing gear door. Knowing that my Captain was currently on the phone with Maintenance control; and him having no idea that maintenance was still working on the plane; I was worried that maintenance control could have had him turn on/off hydraulic systems. I immediately yelled to the mechanic to get away from the area and ran upstairs to the cockpit to inform the Captain not to perform any functions. The major issue today was that the mechanic was still working on the plane even though the red 'Aircraft Out of Service' card was not in place. Specifically; he was servicing the yellow hydraulic system. The airplane was also signed off with an Airworthiness for a heavy check that was performed the night/morning prior. Simply putting power to the aircraft with a switch in the wrong position could have had fatal consciences.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.