jetcareers - View Single Post

B767Driver · November 21st, 2007, 19:15

Disclaimer...this is my own thoughts...other material introduced into the discussion may prove me wrong.

"Critical Engine" is an FAA certification parameter used to evaluate single engine performance on the ground and in the air. Nowhere, is wind introduced into the certification discussion concerning engine out flight. Therefore, I would not consider wind when determining which engine is "critical". i.e. in a twin engine jet...neither or both or critical.

The crosswind component will make the maneuver more or less difficult, no doubt. But I don't think it makes a difference in regards to certification.

In the simulator...the instructors conductor V1 cuts in both upwind and downwind scenarios. The downwind manuever is more difficult.

However, in a checking environment, either engine may fail...either upwind or downwind. The evaluator is required to check the V1 cut with the critical engine failed. So this lends me to believe that the FAA does not consider wind in determining the critical engine.

Also, lateral deviation during certification must be 30' or less from centerline.

November 21st, 2007, 19:15	#5
B767Driver Old Skool Join Date: Sep 2003 Posts: 1,847	Re: Jet Aircraft Critical Engine Disclaimer...this is my own thoughts...other material introduced into the discussion may prove me wrong. "Critical Engine" is an FAA certification parameter used to evaluate single engine performance on the ground and in the air. Nowhere, is wind introduced into the certification discussion concerning engine out flight. Therefore, I would not consider wind when determining which engine is "critical". i.e. in a twin engine jet...neither or both or critical. The crosswind component will make the maneuver more or less difficult, no doubt. But I don't think it makes a difference in regards to certification. In the simulator...the instructors conductor V1 cuts in both upwind and downwind scenarios. The downwind manuever is more difficult. However, in a checking environment, either engine may fail...either upwind or downwind. The evaluator is required to check the V1 cut with the critical engine failed. So this lends me to believe that the FAA does not consider wind in determining the critical engine. Also, lateral deviation during certification must be 30' or less from centerline. __________________ A self described gym rat. "I got next."