Applying the PNR using the endurance of
64 minutes when overhead Tindal we get an ETI out to the PNR 1 Inop of
So ETA at the PNR is 28.6 minutes after
the overhead Tindal position
= 1204.6 UTC. Answer “C” best !
If we wanted instead to find the
distance from Tindal to the 1 Inop PNR we would apply the Normal ops GS
OUT of 228 kt to the time out of 28.6 minutes to get a distance of 108
Note that the time out from Tindal to
the PNR at normal operations groundspeed, plus the time home from the
PNR 1 engine inoperative at 1 engine inoperative groundspeed, must equal
the total safe fuel endurance when overhead Tindal, when on your way out
to the PNR.
Be aware that the track change overhead
Tindal may significantly alter your groundspeeds in the Tindal to Darwin
sector compared to those on the Alice Springs to Tindal sector.
The above is an extract from the
Internet delivered ATPL Navigation course, and I trust you found it
beneficial. For information on ATPL courses delivered by the Internet or
by books, refer to these web pages: