B737 First Officer reported during pre-flight walk around finding a hydraulic line disconnected in the wheel well. No documented maintenance of disconnected line in maintenance history.
Synopsis
B737 First Officer reported during pre-flight walk around finding a hydraulic line disconnected in the wheel well. No documented maintenance of disconnected line in maintenance history.
Narrative
First officer found hydraulic line not connected during the preflight. Aircraft X. Aircraft maintenance reported that the hydraulic electric pump was not connected to the B reservoir and that they had no idea why. According to their paperwork; the aircraft had not had any hydraulic maintenance completed for 90 days. The aircraft had just overnighted in ZZZ. I contacted chief pilot and dispatch. The next plan of action was to determine whether this was some maintenance mistake or something else. We requested a maintenance supervisor; but none showed up. The next maintenance crew showed up and said this was all completed from a previous write up; later discovering it was our own original write up that they were reading. Another maintenance crew showed up and started arguing with the current maintenance crew asking why are they talking to the captain; since they don't work on an airplane? Evidently this maintenance personnel was an avionics person. Person A and Person B. I explained to them how we all need to be on the same page; and worked together with transparency. We were unable to move forward; so I reported an unable to operate. Then followed up with chief pilot; and he was able to confirm that the plane overnighted in the hangar and the maintenance supervisor said all individuals would be followed up with. Possibly someone in the hanger; changed a filter; having to remove that hydraulic line and never screwed it back in.
Second reporter narrative
During my preflight walk around I discovered a hose that was not connected properly under the right main gear wheel. I alerted the Captain and he wrote it up. Maintenance arrived stating it was the standby pump for the hydraulics. However; after they investigated it more they told us it was a hose for the hydraulic B system. They were able to connect properly; however there was no documentation of how it could have been disconnected. At first maintenance told us they had no history on why it could be disconnected in the first place. The Captain insisted that maintenance find out why it could have been disconnected. Multiple maintenance personnel kept talking with us but we seemed to be getting different answers. Eventually the captain was not comfortable; refused the aircraft and asked for a different aircraft. After leaving the airplane we learned that maintenance was performed; specifically on the hydraulics the night before; but apparently logged in a different area; other than the ELB (Electronic Log Book) history. Once we learned of the new information we headed back to the gate to find out that they already switched aircraft. We received a new aircraft and continued without incident.
More incidents for this aircraft family →
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.