Narrative:

I filed an IFR flight plan in a cheyenne III I have flown for a private company for many years. In the pattern; I lowered the landing gear handle; I felt the landing gear extend but did not get a green light for the left main and the 'gear not locked' light was illuminated. I abandoned the landing and gained altitude to orbit and run the checklist(s). Using the emergency gear extension checklist I tried using the hand pump and the blow down systems and could not get a safe indication. I assessed weather; fuel and daylight and decided to fly to another airport; 170 NM away because I felt I needed to burn down fuel to make the aircraft lighter and minimize the fire hazard. I checked NOTAMS and weather at another airport along the way. ATC suggested I fly by the tower and have them visually inspect the landing gear. They advised me the landing gear appeared down but the inner gear doors were open. I advised them I wanted to go to another airport and land. I arrived in the pattern and a local pilot in a cirrus offered to have a closer look at the gear and I accepted. He advised me the landing gear appeared extended with the inner doors open. I proceeded with a normal landing. About 500 ft after main wheel touchdown and decelerating through 90 KTS; the left main gear retracted and the left propeller; flap and aileron contacted the runway. When I filed my flight plan; I anticipated a flight student would come with me but they did not. My flight plan was filed showing 2 souls on board (sob) and I did not change it to reflect 1. I should have changed the flight plan to reflect the correct number of sob.

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Original NASA ASRS Text

Title: PA42 pilot reports unsafe left main landing gear during approach and elects to divert to another airport. All attempts at obtaining a safe indication are futile and after a normal landing the left main gear collapses.

Narrative: I filed an IFR flight plan in a Cheyenne III I have flown for a private company for many years. In the pattern; I lowered the landing gear handle; I felt the landing gear extend but did not get a green light for the left main and the 'gear not locked' light was illuminated. I abandoned the landing and gained altitude to orbit and run the checklist(s). Using the Emergency Gear Extension Checklist I tried using the hand pump and the blow down systems and could not get a safe indication. I assessed weather; fuel and daylight and decided to fly to another airport; 170 NM away because I felt I needed to burn down fuel to make the aircraft lighter and minimize the fire hazard. I checked NOTAMS and weather at another airport along the way. ATC suggested I fly by the Tower and have them visually inspect the landing gear. They advised me the landing gear appeared down but the inner gear doors were open. I advised them I wanted to go to another airport and land. I arrived in the pattern and a local pilot in a Cirrus offered to have a closer look at the gear and I accepted. He advised me the landing gear appeared extended with the inner doors open. I proceeded with a normal landing. About 500 FT after main wheel touchdown and decelerating through 90 KTS; the left main gear retracted and the left propeller; flap and aileron contacted the runway. When I filed my flight plan; I anticipated a flight student would come with me but they did not. My flight plan was filed showing 2 Souls On Board (SOB) and I did not change it to reflect 1. I should have changed the flight plan to reflect the correct number of SOB.

Data retrieved from NASA's ASRS site as of July 2013 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.