So, I was watching a video of a Boeing 737 NG land, and heard the "5" callout. Is that an airline option or something?
EDIT : link to video
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The Rockwell Collins EGPWS, that is probably the most widely used system (you can tell right away by the voice that sounds exactly like the character "Data" from Star Trek - Next Generation; I'd swear it's the same actor's voice) comes with the full range of callout altitudes/heights and airlines pick and choose which ones they want by "configuration strapping" settings (connector pin jumper configurations in the mounting tray) when the units are installed in the avionics bay.
Yes, that must be an airline option. My Boeing 737 NG FCOMv2 says (15.20.17 Warning Systems - System Description):
Radio Altitude Callouts
The GPWS provides the following altitude callouts during approach:
- 2,500 feet – TWENTY FIVE HUNDRED
- 1,000 feet – ONE THOUSAND
- 500 feet – FIVE HUNDRED
- 100 feet – ONE HUNDRED
- 50 feet – FIFTY
- 40 feet – FORTY
- 30 feet – THIRTY
- 20 feet – TWENTY
- 10 feet – TEN.
Note: Callouts at 1000 feet and 500 feet are based on barometric altitude above the landing field elevation; callouts at 2,500 feet, and below 500 feet are based on radio altitude.
The FIVE callout is not listed here and I actually never heard it (could you link the video?). But since not all airlines have all of these callouts, it must be an airline option.