MNPS airspace A340
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Joined: May 2008
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From: Abu Dhabi
MNPS airspace A340
To enter MNPS airspace you require 2 LRNS
If you lose 2 IRU's you would still have 2 FMs, 3 MCDUs and 1 IRU left
If your aircraft also has 2 GPS, would you not still have 2 LRNS as a GPS is counted as a LRNS? ie: 1st LRNS = 1FM/MCDU and 1 IRU. 2nd LRNS 1 FM/MCDU and 1 GPS
If you lose 2 IRU's you would still have 2 FMs, 3 MCDUs and 1 IRU left
If your aircraft also has 2 GPS, would you not still have 2 LRNS as a GPS is counted as a LRNS? ie: 1st LRNS = 1FM/MCDU and 1 IRU. 2nd LRNS 1 FM/MCDU and 1 GPS
Joined: Mar 2000
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From: Arizona USA
If your aircraft also has 2 GPS, would you not still have 2 LRNS as a GPS is counted as a LRNS?
Been there, done that, personally....long ago.
Joined: Jan 2007
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From: Vermont
A good reference for these questions is the North Atlantic MNPSA Operations Manual, which can be downloaded at this link:
http://www.nat-pco.org/nat/MNPSA/MNPSA_2008.pdf
Take a look at paragraph 1.3.2, Lateral Navigation. Note that each navigation system must either be an INS, a GPSS, or have input from at least two IRUs or other MNPS equivalent sensor systems. So your scenario with one IRU supplying one FM might not be acceptable.
Note also the requirements for GPS approval, as well as the requirement that each system provide continuous indication of aircraft position relative to track.
Some of these points may help in determining whether your configuration could be approved.
http://www.nat-pco.org/nat/MNPSA/MNPSA_2008.pdf
Take a look at paragraph 1.3.2, Lateral Navigation. Note that each navigation system must either be an INS, a GPSS, or have input from at least two IRUs or other MNPS equivalent sensor systems. So your scenario with one IRU supplying one FM might not be acceptable.
Note also the requirements for GPS approval, as well as the requirement that each system provide continuous indication of aircraft position relative to track.
Some of these points may help in determining whether your configuration could be approved.
Joined: Apr 2010
Posts: 89
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From: in the flight deck
Hi. Got a question regarding LRNS requirement. It says 2 LRNS (for my ac type-A320) are needed for oceanic ops/remote areas. How do i know if the route is considered remote? Sorry if this sounds silly.....Thank you.
