HC, don't need Geoff.
Whoever teaches to arm the automation in the 139 right before intercepting the GS is not letting you play with a full deck of cards.
The automation in the 139 allows you to switch seamlessly from FMS to short range NAV modes and it also allows the pilot to shoot an ILS or VOR approach the old way, by arming the APP when on radar vectors to final.
The crew needs to be aware of the correct Navigation Source selection for the respective mode of navigation, the risk being to fly through the FAC without the automation capturing it.
The only limitation, other than speed for a glide slope of 7.5*, is MAXIMUM RECOMMENDED Localizer intercept angle of 45* @ ranges above 10nm or 30* when inside 10nm.
Mark Six, you are quoting the QRH out of context, what you wrote is a NOTE not a limitation, and it actually states:
Note
To avoid false localizer captures, APP mode should be
armed when the helicopter is flying inbound to the ILS radial. (I know, localizers haven't got radials BTW)
Remember that you need to get established onto the LOC before capturing the GS.
Last edited by tottigol; 25th Apr 2014 at 23:19.