SLOP

Question 1

Where should SLOP procedures be authorized?

Answer 1

According to ICAO DOC 4444 “PANS ATM” strategic lateral offsets should only be authorised in en-route oceanic or remote continental airspace.

Question 2

What offsets are allowed for SLOP operations?

Answer 2

1 or 2 nm right of airway center line

Question 3

What aircraft capability is required to be allowed to do SLOP?

Answer 3

Automatic offset tracking capability

Question 4

When can SLOP procedures not be used?

Answer 4

When parallel airways are less than 30 nm apart

Question 5

Why do we use SLOP procedures?

Answer 5

To create a bit of randomness. As everyone is exactly on the center line, climbs or descents due to turbulence may pose a collision risk. By offsetting that risk is reduced.
Can also be used to avoid wake turbulence

Question 6

Do we have to inform ATC when adopting SLOP procedures?

Answer 6

No not if we are in Non-radar/ADS airspace

Question 7

What do you have to do before entering controlled airspace when you have adopted SLOP?

Answer 7

Obtain approval from ATC prior to entering