Lieutenant Heather McConel was a human Starfleet officer who served as the assistant chief engineer aboard the USS Enterprise in the 2260s.

Heather's Scottish descent meant that she was good friends with Lieutenant Commander Montgomery Scott and the two officers worked well together. Like Scotty, Heather had a fondness for Scotch and in 2268, built an illegal distillery in engineering to make the alcoholic drink. When McConel became affected by the emanations by the Alnathian jewel, she became obsessed with improving the Enterprise's engines along with Scotty. (TOS novel: The Klingon Gambit)

USS Enterprise (NCC-1701) engineering personnel
under Rasmussen & April	Brownell • Chang • Cho • Fourrier • Graff • Hart • Kursley • Marvick • McCormick • Number One • Powell • Roberts • Saffire • Thompson • Thorvaldsen • Wood	under Pike	Abdelnaby • Ars Dan • Barry • Brien • Hazarstennaj • Grace • Burnstein • Pitcairn • Samson • Scott • Spahn • van Hansen • Wright • Yamata
under Kirk (1st 5-year mission)	Andres • Antonoff • Aziz • Barnhart • Bates • Becker • Berkeley • Bregman • Burdock • Campeas • Celaux • Chatusram • Cho • Colfax • Cortez • Crider • Critelli • Dastagir • Davis • DeLong • deRoos • DeSalle • Devlin • Dixon • Douglas • Dubois • Duchamps • Edwards • Frost • Harper • Harrison • Gabler • Galaym • Galloway • Gardner • Gordon • Grant • Green • Hart • Hazarstennaj • Holgersson • Jacobs • James • Jenkins • Kaplan • Kopka • Krensky • Kyle • Lanz • Lefebre • Lemli • Leslie • Lewis • Loupas • Lyles • MacPherson • Masters • Markham • Matt • McConel • McDuff • McPhee • M'degu • Mikhalis • Miller • Mueller • Nagata • Nason • Oba • O'Neil • Orsay • Renner • Riley • Riviera • Rogers • Rostofski • Russ • Satterfield • Scott • Senif • Sepopoa • Shallert • Shigeda • Singh • Stanley • Stryker • Sulernova • Tam • Tenney • Tersarkisov • Thomas • Washburn • Watkins • Watson • Whitehead • B. Wilson • Wilson • Winfield • Wyatt • Zellich
subsequent missions under Kirk & Spock	Athendë • Bradley • Cleary • Dettner • R. Grenni • Lasja Ihirian • Jacobs • Kasatsuki • Kugel • Layne • Lydia • Peter Preston • Quarton • R'trikahi • Janice Rand • Teresa Ross • Schneider • Montgomery Scott • Two Feathers • Washburn • Weinberger • Cyron Williams
see also: administrative personnel • communications personnel • medical personnel • pilots & flight control personnel • security & tactical personnel • sciences personnel • senior staff • unnamed