Originally Posted by
deja vu
I recall the C206 doing the Coonamble NDB approach at Coonabarabran on one dark rainy night, must have been nearly 50 years ago now. RIP.
Demonstrated the importance of monitoring the idents although they were very similar.
C182, VH-UDM, 1978
What doesn’t come out in the accident report is the similarity of the two NDB identifiers, and the potential to easily confuse the Morse Code.
Coonabarabran NDB was identified CBB -.-. -... -...
At the time Coonamble NDB was identified CNB -.-. -. -...
The Morse CBB compared to CNB is very similar and easy to confuse, especially with a weak signal or static noise. (See above).
After the accident, the identifier for Coonamble was changed to CNM -.-. -. --
(Not in the report, but rumour was…. talk that the frequencies on the fairly modern (at the time) analogue tuners in those Cessna/arc ADF sets could be an issue with paralex - CBB 200 | CNB 206)
Accident report, VH-UDM 1978