Regarding Driftdown Calculations, Method 1 indicates that the engine-out net flight path must clear by 1000 feet within five statute miles of the planned route. Which statement best matches this?

Regarding Driftdown Calculations, Method 1 indicates that the engine-out net flight path must clear by 1000 feet within five statute miles of the planned route. Which statement best matches this?

• A. Method 1
• B. Method 2
• C. Both Method 1 and 2
• D. None of the above

Answer: (A)

In driftdown calculations, the goal is to ensure there’s a safe vertical margin for the aircraft after an engine failure as it follows the planned route. Method 1 specifies a fixed criterion: the engine-out net flight path must clear by 1,000 feet within five statute miles of the planned route. This exact criterion defines Method 1, so the statement that describes this 1,000-foot clearance within five miles is the best match. The other method uses a different criterion for obstacle clearance, so it does not describe the same condition.

In driftdown calculations, the goal is to ensure there’s a safe vertical margin for the aircraft after an engine failure as it follows the planned route. Method 1 specifies a fixed criterion: the engine-out net flight path must clear by 1,000 feet within five statute miles of the planned route. This exact criterion defines Method 1, so the statement that describes this 1,000-foot clearance within five miles is the best match. The other method uses a different criterion for obstacle clearance, so it does not describe the same condition.