Narrative:

On the final approach we lowered the gear handle and the gear failed to give 'three green' indication. The right main gear light failed to illuminate. After testing the light and placing a phone call to the assistant chief pilot; we began to complete the emergency gear extension checklist. That was unsuccessful; so we declared an emergency and elected to land at nearby ZZZ international and did so uneventfully. In training; with this emergency; we are trained to follow the abnormal/emergency checklist. In the sim; requires that we always blow the gear down where we always get three green lights. What happened in this case is that we did not get three green lights. In our situation; the issue became what to do; if you do not get three green lights? As any crew would do; we relied on our experience. Lastly at the end of the checklist for this issue; it says '...three green lights; checklist complete.' there is no checklist for the 'gear did not extend' or any contingency plan.I feel we handled this situation safely; professionally and adequately. We were on day 6 of 7 of a very busy week and near hour 13 of this day. It was late at night with a severe line of thunderstorms on our tail. Fortunately we were still at the top of our game and I can see how it could have been easy for a tired or lesser experienced crew to have compounded this problem by having no complete checklist or training to rely upon for this specific type of problem. It was amazingly distracting with the gear horn going off almost the whole time; flaps; and other audible warnings. There was nothing else we could do; as a crew; to handle this situation any better. We used good judgment; good CRM; we communicated well in the cockpit as well as with the passengers. I would like urge our company and cessna to address this critical safety item in a timely manner by bring light to this situation.

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Original NASA ASRS Text

Title: CE560 flight crew experienced an unsafe landing gear indication during approach and executes a go-around. Emergency gear extension procedures do not change the indication. The crew elected to divert to a longer runway and lands safely after declaring an emergency.

Narrative: On the final approach we lowered the gear handle and the gear failed to give 'three green' indication. The right main gear light failed to illuminate. After testing the light and placing a phone call to the Assistant Chief Pilot; we began to complete the emergency gear extension checklist. That was unsuccessful; so we declared an emergency and elected to land at nearby ZZZ International and did so uneventfully. In training; with this emergency; we are trained to follow the abnormal/emergency checklist. In the SIM; requires that we always blow the gear down where we always get three green lights. What happened in this case is that we did not get three green lights. In our situation; the issue became what to do; if you do NOT get three green lights? As any crew would do; we relied on our experience. Lastly at the end of the checklist for this issue; it says '...three green lights; checklist complete.' There is NO checklist for the 'Gear did not extend' or any contingency plan.I feel we handled this situation safely; professionally and adequately. We were on day 6 of 7 of a very busy week and near hour 13 of this day. It was late at night with a severe line of thunderstorms on our tail. Fortunately we were still at the top of our game and I can see how it could have been easy for a tired or lesser experienced crew to have compounded this problem by having no complete checklist or training to rely upon for this specific type of problem. It was amazingly distracting with the gear horn going off almost the whole time; flaps; and other audible warnings. There was nothing else we could do; as a crew; to handle this situation any better. We used good judgment; good CRM; we communicated well in the cockpit as well as with the passengers. I would like urge our company and Cessna to address this critical safety item in a timely manner by bring light to this situation.

Data retrieved from NASA's ASRS site as of April 2012 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.