Section 5 of 18

Numbers, time and pressure

(Numbers and Time: CAP 413)

Numbers cause more readback errors than anything else, so aviation pronounces them deliberately. Note especially fife (5) and nin-er (9), which are confused in normal speech, and tree (3), fow-er (4), ait (8).

Digit	Say	Digit	Say
0	ZE-RO	6	SIX
1	WUN	7	SEV-EN
2	TOO	8	AIT
3	TREE	9	NIN-ER
4	FOW-ER	decimal	DAY-SEE-MAL
5	FIFE	thousand	TOUSAND

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