A320 IRS Drift Over Time
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Joined: Apr 2023
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From: Mumbai
A320 IRS Drift Over Time
I am planning on doing an 'Around the world' flight in a Study level A319 Simulator. (which does simulate IRS drift)
I was planning on keeping the IRS's on after each landing to save on time and effort to align them each time, but I am worried about drift adding over time.
I assume most LCC's today probably don't realign the IRS's after each flight, till they secure the plane after the last flight of the day.
Practically, would it be a concern?
I was planning on keeping the IRS's on after each landing to save on time and effort to align them each time, but I am worried about drift adding over time.
I assume most LCC's today probably don't realign the IRS's after each flight, till they secure the plane after the last flight of the day.
Practically, would it be a concern?
Joined: Mar 2006
Posts: 2,632
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From: USA
You'll also have plenty of time to do a full alignment if it simulates the actual fuel uplift rate.
Policies at airlines will vary, but it's unlikely a narrowbody will go a whole day on just one alignment.
Policies at airlines will vary, but it's unlikely a narrowbody will go a whole day on just one alignment.
Joined: Feb 2018
Posts: 800
Likes: 279
From: East of Westralia
I am planning on doing an 'Around the world' flight in a Study level A319 Simulator. (which does simulate IRS drift)
I was planning on keeping the IRS's on after each landing to save on time and effort to align them each time, but I am worried about drift adding over time.
I assume most LCC's today probably don't realign the IRS's after each flight, till they secure the plane after the last flight of the day.
Practically, would it be a concern?
I was planning on keeping the IRS's on after each landing to save on time and effort to align them each time, but I am worried about drift adding over time.
I assume most LCC's today probably don't realign the IRS's after each flight, till they secure the plane after the last flight of the day.
Practically, would it be a concern?
Refuelling and preflight will take longer. You’re not saving any time by skipping it.
Joined: Mar 2012
Posts: 2,605
Likes: 154
From: Having a margarita on the beach
I am planning on doing an 'Around the world' flight in a Study level A319 Simulator. (which does simulate IRS drift)
I was planning on keeping the IRS's on after each landing to save on time and effort to align them each time, but I am worried about drift adding over time.
I assume most LCC's today probably don't realign the IRS's after each flight, till they secure the plane after the last flight of the day.
Practically, would it be a concern?
I was planning on keeping the IRS's on after each landing to save on time and effort to align them each time, but I am worried about drift adding over time.
I assume most LCC's today probably don't realign the IRS's after each flight, till they secure the plane after the last flight of the day.
Practically, would it be a concern?
from a procedural point of view you would perform a complete IRS alignment if it was:
- First flight of the day or
- Crew change or
- Departure airport located between 2° North and South or
- GPS not available and poor NAVAID coverage enroute or
- GPS not available and flight time greater than 3 hours.
Other than that you would perform a fast alignment if the difference between the IRS position and FMGC position is at or above 5 NM.
Bottom line if You want some proper level of realism just do a full alignment every time you fire up your Sim.
