Narrative:

Upon take off; I retracted the gear. After completion of the cycle; the rh main landing gear (medium large transport) (green) light remained illuminated. The (red) gear unlocked light and hydraulic press light extinguished. I advised tower and entered a downwind in order maintain contact with the field as I ran the checklist. Tower advised that they had 'rolled the trucks' essentially letting everyone know that we had an emergency situation on hand. On downwind; I also advised [airport] ops and [dispatch] of the situation. The rh medium large transport light flickered on downwind and eventually extinguished. On my first pass down runway xx left; I flew a low approach above 500 feet in order to have more time to run the checklist. Tower advised the gear appeared to be up (as expected). I entered downwind again and per the checklist; I slowed below 130 KIAS and [extended] the gear. A normal cycle was witnessed and three green lights were observed. I pulled the gear hyd circuit breaker and elected not to blow the bottle as it appeared a normal gear extension had occurred. On short final; tower advised that my gear appeared to be down. I landed without event and taxied back to the maintenance hangar. I was met by the fire and rescue team and discussed the event with them while filling out the required paperwork. Cold weather impact on main landing gear actuators - based on discussion with maintenance control.

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Original NASA ASRS Text

Title: C402 Captain reported returning to the departure airport due to a landing gear system malfunction.

Narrative: Upon take off; I retracted the gear. After completion of the cycle; the RH Main landing gear (MLG) (green) light remained illuminated. The (red) gear unlocked light and HYD Press light extinguished. I advised tower and entered a downwind in order maintain contact with the field as I ran the checklist. Tower advised that they had 'rolled the trucks' essentially letting everyone know that we had an emergency situation on hand. On downwind; I also advised [Airport] Ops and [Dispatch] of the situation. The RH MLG light flickered on downwind and eventually extinguished. On my first pass down RWY XX Left; I flew a low approach above 500 feet in order to have more time to run the checklist. Tower advised the gear appeared to be up (as expected). I entered downwind again and per the checklist; I slowed below 130 KIAS and [extended] the gear. A normal cycle was witnessed and three green lights were observed. I pulled the Gear Hyd CB and elected not to blow the bottle as it appeared a normal gear extension had occurred. On short final; Tower advised that my gear appeared to be down. I landed without event and taxied back to the maintenance hangar. I was met by the fire and rescue team and discussed the event with them while filling out the required paperwork. Cold weather impact on Main landing Gear actuators - Based on discussion with Maintenance Control.

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.