Narrative:

Just after leveling off at FL280 the first officer reached back to get the last two cans of a six pack of water. As he brought it forward; one can dropped off the plastic holders and hit the center console. The can split open. I grabbed it as fast as possible but it was essentially empty. I grabbed napkins and quickly dried as fast as I could. The first officer also grabbed napkins to help dry. It seemed that we were able to get most of the water but apparently it reached the ATC control head and number 2 VHF navigation head. ATC asked if we wanted FL320 for a reported better ride. We accepted and started our climb. ATC then said he lost our mode C and could we recycle. We looked down and saw the ATC fail light. Switched to number 2 and ATC reported our mode C had returned. Continued the flight and descent into ZZZ. During descent into ZZZ; ATC said our transponder code had changed and gave us our number again to correct it. When I went to change it our display showed all 8888. We tried to fix but unable. The first officer was using LNAV to zzzzz intersection he wondered why it didn't capture to the localizer. I looked over and now the number 2 navigation head showed fail in both active and select windows. The number one head was fine. We transferred control to me and I used the ILS on my side to descend and finish the approach. We landed visually with no further incidents. Called dispatch and maintenance control to advise what had happened and made logbook entries for the two inoperative items.as it was an accident that the can fell; I think that better attention to the possibility of repeat could be prevented with positive control of the cans instead of grabbing the plastic can holders.

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Original NASA ASRS Text

Title: B737NG flight crew reported the First Officer dropping a water can on the center pedestal where is burst open and emptied. A short time later Transponder #1 and #2 NAV tuning head failed which then affected the First Officer's LNAV.

Narrative: Just after leveling off at FL280 the First Officer reached back to get the last two cans of a six pack of water. As he brought it forward; one can dropped off the plastic holders and hit the center console. The can split open. I grabbed it as fast as possible but it was essentially empty. I grabbed napkins and quickly dried as fast as I could. The First Officer also grabbed napkins to help dry. It seemed that we were able to get most of the water but apparently it reached the ATC control head and number 2 VHF NAV head. ATC asked if we wanted FL320 for a reported better ride. We accepted and started our climb. ATC then said he lost our mode C and could we recycle. We looked down and saw the ATC Fail light. Switched to number 2 and ATC reported our mode C had returned. Continued the flight and descent into ZZZ. During descent into ZZZ; ATC said our transponder code had changed and gave us our number again to correct it. When I went to change it our display showed all 8888. We tried to fix but unable. The First Officer was using LNAV to ZZZZZ Intersection he wondered why it didn't capture to the Localizer. I looked over and now the number 2 NAV head showed FAIL in both active and select windows. The number one head was fine. We transferred control to me and I used the ILS on my side to descend and finish the approach. We landed visually with no further incidents. Called Dispatch and Maintenance Control to advise what had happened and made logbook entries for the two inoperative items.As it was an accident that the can fell; I think that better attention to the possibility of repeat could be prevented with positive control of the cans instead of grabbing the plastic can holders.

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.