IRS alignment B737NG
Thread Starter
Joined: Apr 2012
Posts: 29
Likes: 1
From: Europe
IRS alignment B737NG
Hello,
In my company we only fly B737NG. We are aligning the IRS' on every turnaround, but wonders if this might be an unneccecary procedure from the past. Is this neccecary on the NG, and is it common amongst other NG operators?
In my company we only fly B737NG. We are aligning the IRS' on every turnaround, but wonders if this might be an unneccecary procedure from the past. Is this neccecary on the NG, and is it common amongst other NG operators?
Last edited by Life on top; 9th April 2019 at 09:26.
Joined: Apr 2010
Posts: 1,320
Likes: 102
From: IRS NAV ONLY
Depends on where you fly, but in Europe with very reliable and accurate VOR/DME/DME updates and dual GPS, it's not really required to align it before every flight.
Nevertheless, I believe it is still Boeing recommendation, "if time permits".
Nevertheless, I believe it is still Boeing recommendation, "if time permits".
Joined: Sep 2006
Aviation Qualifications: ATPL
Posts: 682
Likes: 16
From: Out of a bag
SOP at my outfit is for full alignment on turnaround as per Boeing, this despite being fitted with dual GPS.
I would pose the question of when would you ever NOT have the time for a full alignment to be completed on a turnaround?
I would pose the question of when would you ever NOT have the time for a full alignment to be completed on a turnaround?
Joined: Jan 2002
Posts: 114
Likes: 0
From: germany
The alignment requirement has its roots by Boeing harmonising the Classic with the NG and other Boeing type aircraft.
When my outfit first received the NG in 1999 we did not realigne at all. As far as I know 757 and 767 also realigne after every flight.
When my outfit first received the NG in 1999 we did not realigne at all. As far as I know 757 and 767 also realigne after every flight.
Joined: Jun 2000
Posts: 4,507
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From: last time I looked I was still here.
Over many companies, B757/767 733/737/738. In Europe it was a full align before 1st flight, then fast align on turnarounds. Before an ETOPS or long-haul sector it was full align. In a B738 company, new to type, they did full aligns every turnaround. Then a Boeing visit came and they asked, why? After that it became full align on crew changes and fast align on turn-rounds.
Joined: Sep 2006
Aviation Qualifications: ATPL
Posts: 682
Likes: 16
From: Out of a bag
Having said that, having received the latest batch of NGs, they've got a Honeywell ADIRU issue which means that once initialised at the start of the day, they are left in NAV until the end of the day unless they are likely to have been operating for longer than 18 hours.
Joined: Feb 2013
Posts: 17
Likes: 1
From: 60 north
No Align on turnaruond
A bigger European LCC does not do ANY align on quick turn ( 25 min std).
Do Yourself a favor and check drift by selecting position of L /R IRS and do a quicky if needed. Seen lots of FOs intending to depart with a good spread for a 4hr trip . last hrs over water.
Used to loose one point on a linecheck if you didnt.
Now some cadets dont know how its done.
Charming!!
Do Yourself a favor and check drift by selecting position of L /R IRS and do a quicky if needed. Seen lots of FOs intending to depart with a good spread for a 4hr trip . last hrs over water.
Used to loose one point on a linecheck if you didnt.
Now some cadets dont know how its done.
Charming!!
