Flying Tiger 747 approaching Kuala Lumpur. ATC radioed to the flight, "Tiger 66, descend two four zero zero [2,400 ft]. Cleared for NDB approach runway three three." The captain of Tiger 66, who heard "descend to four zero zero" replied with, "Okay, four zero zero" (meaning 400 ft above sea level, which was 2,000 ft too low). The result was fatal.
The proper radio call from ATC, instead of "descend two four zero zero", should have been "descend and maintain two thousand four hundred feet". The captain read back "okay, four zero zero" where the proper read back should have been "Roger, descend and maintain four-hundred feet".
https://en.wikipedia.org/wiki/Flying...Line_Flight_66
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Reminds me when we were descending into Manila where the lady ATC was talking so fast (her accent didn't help) that the PM got really stressed trying to understand her - let alone read-back instructions. . It was his first time into Manila so his confusion was understandable. In the end it was easier for the PF to continue flying plus do the talking since the PM had lost the plot by then.