QTA Develops Repair for HTF7000 TR Door Corrosion

Quiet Technology Aerospace (QTA) has obtained FAA and EASA approvals for a lower-cost repair for recurring corrosion issues involving Honeywell HTF7000 engine thrust reverser (TR) doors. Applicable to the Bombardier Challenger 300/350, Gulfstream G280, Embraer Legacy 450/500 and Praetor 500/600, and Cessna Citation Longitude, the repair is approved for use even if the TR doors are deemed beyond economical repair, QTA said.

Martin Gardner, QTA executive v-p of engineering and customer support, explained that the TR doors are made from a one-piece 7075 aluminum casting that is subject to corrosion as jet exhaust washes across the surface in line with each core mixer nozzle lobe.

QTA has developed a “Life Extension Program” that involves structurally reinforcing the door with graphite doublers. This will extend the life of the TR doors until a permanent fix is finalized and approved, which QTA expects later this year. The company will offer credit for the permanent repair to customers who have their aircraft doors reinforced through the Life Extension Program.

“Finally, engineering and technology exist that can repair for now…and permanently resolve very soon, a horribly expensive and time-consuming problem that will not go away by installing new OEM doors,” said QTA president Barry Fine. “Our engineering and composite technology will terminate corrosion to the TR doors."