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Safe Landings - November 2011
Upside Down and Backwards
One of several versions of the origin of “Murphy’s Law” contends that the Law’s namesake was Captain Ed Murphy, an engineer at Edwards Air Force Base in 1949. Frustration with a transducer which was malfunctioning due to an error in wiring caused him to remark that—if there was any way that something could be done wrong, it would be.
Recent ASRS reports indicate that Captain Murphy’s Law was in full effect when several aircraft components managed to get installed upside down or backwards.
Pernicious Panel Placement
An aircraft Mode Selector Panel that “looks the same” whether right side up or upside down, and that can be readily installed either way, is a good example of a problematic design. Confronted with an inverted panel, this Cessna 560 Captain found out what happens when the wrong button is in the right place.
Safe Landings - October 2011
See and Avoid
The number of midair collisions in the United States has averaged 30 per year since 1978.1 These accidents primarily involve General Aviation aircraft, but Air Carrier, Corporate and other operators are by no means immune from potentially serious airborne conflicts.
In the preceding 12-month period, more than 4,000 in-flight traffic conflicts were reported to NASA ASRS. Of these, 235 met the ASRS criteria (within 500 feet) for a Near Midair Collision (NMAC). Nearly half of these NMACs involved Air Carrier, Corporate and Air Taxi operations.
Technological advances such as the Traffic Collision Avoidance System (TCAS) and Conflict Alert (CA) have enhanced the ability of pilots and controllers respectively to resolve airborne conflicts before they become critical, but the following ASRS reports show that the “see and avoid” principle remains a crucial aspect of collision avoidance in visual conditions.