Equal Time Points
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Equal Time Points
If you are on a 120 minute ETOPs flight, upon reaching the Equal Time Point (ETP), must the time to fly to either airport ALWAYS be less than or equal to 120 minutes? Thanks...
Join Date: Dec 2004
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Nope:
Your Authority has granted your airline with a maximum diversion time of 120 min. This ops specs is only used to determine the ETOPS area of operation (along with the associated max diversion distance).
120 min is not an operational time limitation to conduct a diversion.
Your Authority has granted your airline with a maximum diversion time of 120 min. This ops specs is only used to determine the ETOPS area of operation (along with the associated max diversion distance).
120 min is not an operational time limitation to conduct a diversion.
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... and when push comes to shove, the Commander may decide to fly a different speed than the one used to determine the 120 min distance. As previous posters said, not an operational limitation.
A totally different matter would be to decide to continue to destination instead of proceeding to ETOPS alternate without apparent reason as one airliner did, not too many years ago.
A totally different matter would be to decide to continue to destination instead of proceeding to ETOPS alternate without apparent reason as one airliner did, not too many years ago.
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Thanks...
Thanks for the replies, everyone. Yes, there is often confusion between ETOPS--which IS time limited (distance, actually), and the ETPs--which are not. Mike
the Commander may decide to fly a different speed than the one used to determine the 120 min distance.
ie. you can't use a high speed single engine speed to determine a wide area of operation (with its associated high fuel flow), but on the day plan a fuel-efficient low speed single engine diversion in order to uplift a higher payload.
Thanks for the replies, everyone. Yes, there is often confusion between ETOPS--which IS time limited (distance, actually), and the ETPs--which are not. Mike
Also the ETP is always out by approx 2 minutes as no account is taken for the turn (assuming the airfields are ahead and behind)