The source said the pilot had ejected with his parachute and was "safe and sound", denying reports he had been captured by the UN-backed Government of National Accord.
The LNA launched an offensive 10 days ago to seize Tripoli, the headquarters of the GNA led by Fayez al-Sarraj which is recognised by the international community.
In addition to ground fighting, both sides conduct daily air raids and accuse each other of targeting civilians.
The clashes have left 121 people dead and 561 wounded since the offensive began on April 4, according to a recent World Health Organization assessment.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)