FAA Aircraft Dispatcher (ADX)Regulations (Part 121)Medium
A dispatcher is computing landing performance for a turbojet airplane arriving at its destination. Under 14 CFR 121.195, the airplane's landing weight must allow it to be brought to a full stop within what percentage of the effective runway length, based on weather reports and forecasts existing at time of arrival?
- A60%
- B70%
- C80%
- D100%
Show answer & explanationAnswer & explanation
Correct answer: A. 60%
14 CFR 121.195 requires that a turbine-engine powered airplane's destination landing weight allow it to be stopped within 60% of the effective length of the runway, using approved landing distance data and destination weather forecasts.
Why the other options are wrong
- B. 70% is not the regulatory figure used in this calculation.
- C. 80% is not the correct destination landing distance factor.
- D. Using 100% of runway length provides no safety margin, which the rule prevents.
Destination Landing Distance (121.195)
Turbine-powered airplanes must be able to land and stop within 60% of the effective runway length at the destination, based on forecast weather and approved performance data.
- 60% factor applies to turbine-powered airplanes
- Based on weight anticipated at time of landing
- Wet/contaminated runway adjustments may further restrict landing weight
Memory trick: 'Sixty percent stops the jet, safety margin you can bet.'