Date: 201412
Local time of day: 1801-2400
Location: JNU.Tower, AK
Weather elements / visibility: Fog
Aircraft: Small Transport
Flight phase: Landing
Airspace: Class D JNU
ATC / advisory: Tower JNU
Reporter organization: Government
Reporter function: Local
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Confusion; Time Pressure
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Weather / Turbulence
Detector: Person Air Traffic Control; Person Flight Crew
When detected: Taxi
Result: Air Traffic Control Provided Assistance; General Declared Emergency
Contributing factors: Aircraft; Procedure
Primary problem: Procedure

Narrative: I was in the middle of receiving a brief for local 1. Aircraft X; was on base to final to RWY 08. There was a thick fog layer over the departure end of the runway moving slowly toward the approach end. At the end of the brief; Aircraft X announced they were going around. I asked if they needed any assistance. Aircraft X was going around because of a possible gear malfunction. When Aircraft X was abeam the tower I informed him his gear appeared down. When Aircraft X retracted their gear; I informed that the gear appeared to be going up. Crash fire rescue (CFR) was informed of the alert 2. Aircraft X was cleared to land once in the downwind. I informed Aircraft X the crash trucks were being deployed. Aircraft X stated it wasn't necessary. Aircraft X landed safely and was instructed to turn left at Charlie and contact ground. Ground instructed CFR their services were no longer needed. At that time Aircraft X started to turn left off of the runway and their back right gear gave away and was stranded on the runway. CFR was informed of the situation and was redirected onto the runway. Unit 4 and 27 were also authorized onto the runway. An inbound aircraft was then instructed to make 360's over a reporting point and hold for the disabled aircraft on the runway. The fog layer continued its encroachment toward the approach end of RWY 08. The weather was low and secluded enough that it only blocked the view of the runway and all activities on the runway. The feeder taxiways were starting to be obscured. Unit 4 was vacating the runway after conducting a FOD check. Unit 4 stated the runway was now open. Since I couldn't see the runway surface I asked Unit 4 to confirm that the aircraft; all vehicles and personnel were off the runway. Unit 4 said affirmative but was going to the next taxiway intersection just to confirm. I didn't feel confident with his answer so I informed Unit 4 I would still suspend all operations until he gave me that confirmation. 42 seconds later; Unit 27 called clear of the runway. At that time the runway was called clear and I resumed operations to RWY 08. Have one point of contact for vehicles responding to an emergency. They should coordinate all operations and activities between ATC and responding vehicles. That one person should also be held accountable to ensure all vehicles; personnel are clear of the runway. That way this situation where one vehicle calls clear for everyone (we do not have one person in charge here) and someone is still on the runway.




Synopsis: JNU Tower Controller describes a situation where an aircraft has a gear problem; but the pilot is able to land safely. After landing; the gear collapses while taxiing on the runway. City ops alert vehicles to respond. When all clear is given; the Controller isn't sure and has city ops verify the runway is clear of all vehicles and aircraft.