EDTO

Question 1

What is the concept of EDTO?

Answer 1

• It’s the concept that an aircraft can fly outside the threshold time of an adequate aerodrome but must be followed using more stringent operational requirements and standards.

Question 2

What are the aircraft requirements for EDTO?

Answer 2

OEI LRC speed

Question 3

What is the 60 minute rule?

Answer 3

back in the day:

the flight time of 2 and 3 engine aircraft should not be more than 60 minutes (FAA) from an adequate aerodrome

• at OEI LRC speed that’s around 400nm.

outside the USA it’s 90 minutes

Question 4

What is the threshold time for EDTO in modern times as per CAR 1

Answer 4

60 mins for 2 engine

180 mins for more than 2 engine

Question 5

what is the EDTO critical fuel requirement

Answer 5

the minimum fuel requirement for EDTO is the highest of the two:

• normal flight fuel (DEP to DEST to ALT if required + reserves)
• emergency reserves ( fly from most fuel critical ETP to EDTO alternate and able to hold for 15 minutes at 1500ft w instrument approach to land.

Question 6

Why is LRC the standard drift down procedure

Answer 6

Gives max TAS so minimum diversion time

Question 7

What is the range circle dist for a 777-300er up to 180 min EDTO

Answer 7

1275 nm

Question 8

What minima apply to EDTO end points

Answer 8

Normal departing and destination minima

Question 9

For max diversions up to 180 min, what’s the speed for 777-300er

Answer 9

425 knots

Question 10

Does wind correction need to be made to range circles for a/c in excess of 180min

Answer 10

Yes

Question 11

When would engine out drift down speed be selected

Answer 11

When terrain or fuel critical

Question 12

What are the EDTO range circles for 777-300er up to 120 mins

Answer 12

850nm

Question 13

What are the EDTO primary systems

Answer 13

Electrics, hydraulics and pneumatics

Question 14

What is the minimum holding requirement at an EDTO aerodrome

Answer 14

15 minutes at 1500ft above aerodrome