Gen Nav -conflicting feedback
I have come across the same feedback question from Bristol and Oxford that appear to give different answers. Can anyone give the diffinitive answer (thats to say the one that the CAA says is correct!)?
The Oxford question states:
If an INS is switched off and then on again in flight, which of the following happens?
a) It is unusable for the rest of the flight
b) Carry on as before
c) It is usable after a position update
d) It is usable in ATT REF only
The correct answer is given as (d)
The Bristol question states:
A pilot turns off the power to his (or her please!) IRS in flight. If S/He switches it back on after just a few seconds will the effect be
a) The IRS can be used providing the position is checked
b) There will be no effect and the IRS can continue to be used
c) The IRS cannot be used and should be shut down
d) IRS cannot be used for NAV but can be used to give attitude information
The correct answer is given as (c)
I note that one question states INS and the other states IRS. Is this significant?
On a similar matter I have found some contradiction in the text notes of 2 schools regarding whether for practical navigation purposes the earth is considered a perfect sphere. I would say it is but has found one publication that says not.
Anyone?