Readback: July 2012

Your editorial in the May issue, Looking for Eight More Lives, quoting from the Air Safety Institutes 2012 TAA Special Report, provides an example of how easily summary statistics can lead us astray. Different reports use different methodologies.

Editorial Staff

Monday, August 04, 2014 at 12:00 AM ET

Verified

Key Takeaways:

Aggregated aviation statistics can be misleading, emphasizing the need for detailed analysis of specific aircraft procedures, training, and performance to accurately assess safety differences.
Pilots and air traffic control/flight service specialists often operate from different procedural understandings, suggesting pilots could benefit from familiarity with controller guidelines (e.g., 7110.65) to prevent misunderstandings.
The article clarifies specific aviation safety points, such as the limited obstacle clearance provided by VASI glideslopes beyond four miles from the runway.

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Different Spins on TAAs
Your editorial in the May issue, “Looking for Eight More Lives,” quoting from the Air Safety Institute’s 2012 TAA Special Report, provides an example of how easily summary statistics can lead us astray. Different reports use different methodologies.

By grouping Cirrus and Columbia together, the ASI report implies that Columbia aircraft suffer from a relatively high rate of stall/spin accidents, yet in the entire history of the Columbia fleet, there has been only one documented stall/spin accident. Since the Cirrus fleet is larger and started shipping earlier, the ASI grouping is biased almost 10 to 1 by the Cirrus accident history.