Hot Point by M.L. Buchman

Master mechanic Denise Conroy—with a reputation for being as steel-clad as the aircraft she keeps aloft—shuns useless flyboys who don’t know one end of a wrench from the other.

Firehawk pilot Vern Taylor—known for unstoppable charm and a complete lack of mechanical skills—proves he’s a survivor and a natural-born heli-aviation firefighter.
When they crash together in the Central American jungle with wildfire on one side and a full-fledged military coup on the other, their newly forged partnership is tested to the max. Can their formidable skills protect them from the conflagration sweeping the jungle…and their hearts?

[Can be read stand-alone or in series. A complete happy-ever-after with no cliffhangers. Originally published in 2015. Re-edited 2022 for improved reader experience but still the same great story.]