Lieutenant Commander Leland T. Lynch is the Enterprise-D chief engineer who rushes the dilithium chamber back into service when Deanna Troi's shuttle crashes on Vagra II.
Leland T. Lynch appears in Skin of Evil. When the episode opens the Enterprise-D is running on impulse while he carries out maintenance on the dilithium crystals, and he has a habit of giving his full name each time he reports to the bridge.
A distress call from Shuttlecraft 13, carrying Troi and the pilot Ben Prieto, forces him to realign the crystals in a hurry so that the ship can go to warp. He manages it within minutes, and the ship reaches Vagra II.
He plays no part in the confrontation with the creature Armus that follows on the surface. Lynch is one of four chief engineers seen during the first season before La Forge is promoted to the post.