Beaver DHC-2
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3
Situational Awareness; Distraction; Confusion
ATC Issue All Types; Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Airport; Procedure; Human Factors; Aircraft
Now; there was no loss of separation; but there were a handful of things that happened that were kind of bad. So; Aircraft Y called up; ready to go. I scanned the lane and cleared them for takeoff. Seconds after this; Aircraft X called up; stated they were west of the aircraft taking off and needed to cross. Now; when I scanned; I only saw one aircraft moving on the pond; Aircraft Z; so when I saw Aircraft X in relation to this aircraft; it was cool and crossing was no big deal. I crossed Aircraft X and noted that Aircraft Y was taking an awful long time to start takeoff roll. A second or two later; something caught my eye to the west and I saw Aircraft Z in the water lane. I; quickly as I could; instructed Aircraft X to hold short and kept him from entering the water lane. Aircraft Y then departed without incident.When Aircraft X departed I told them to let me (the controller) determine who they were west and east; they said they hadn't seen Aircraft Z behind them.It all worked out; but it could have been way worse.Better scans; I figured out that Aircraft Z; I hadn't seen was behind one of the window beams.
I was leaving my float plane dock at the JNU airport for a flight seeing trip with 2 others on board. The float pond is an active runway; so I called the tower with my numbers; position; direction of flight and the ATIS; requesting a crossover N to S at the end. Didn't hear a response right away; and was getting ready to call again when I hear crossover approved; with no N number. Thought that strange; probably a new person in the tower; stated I was crossing and started. Next thing I see is an aircraft that had taken off behind me and was airborne flying in front of us; and the tower is asking me to identify and what are you doing? There was a second plane behind me; and they had given him clearance to cross after the departing plane had passed; not me. It appears my transmissions were blocked by others talking on the radio and I was unaware the tower had never heard me; as I also had not heard other transmissions as I was talking. Corrective action; I will never move under a tower command until I hear my N number repeated to me; and the tower should never authorize movement without stating an N number first; which I believe happened; them thinking only one plane was on the pond ready to move. Have to realize just because one makes a radio transmission does not mean the other party heard it; so need to make sure any communication heard is actually directed to me and not some other plane.
Juneau Tower Controller and departing pilot reported confusion on who was to depart resulting in what the pilot reported as a NMAC.