Steven P. McNicoll wrote:
"Dennis Johnson" wrote in message
. ..
I thought you had to get an expect further clearance time as part of the
hold instructions in case your radio failed shortly after directed to
hold? Otherwise, how would you know how many turns to make in holding
before proceeding on course? I'm not arguing, just asking,


Why is it that comm radios fail but nav radios do not?

http://www.faa.gov/airports_airtraff...406.html#4-6-1




Probably because com radios require a functioning microphone, PTT and
speakers or earphones. More parts to fail and thus more likelihood of
failure. Most pilots carry enough spares, but even so there is more
likelihood of a comm failure than a nav failure.

Matt