Welcome, Guest. Please login or register.
Did you miss your activation email?
November 26, 2014, 12:20:19 AM
Home Help Login Register      
News: NEW Follow LiveATC updates on Twitter and Facebook


+  LiveATC Discussion Forums
|-+  Air Traffic Monitoring
| |-+  Listener Forum (Moderators: dave, RonR)
| | |-+  "Quick alignment"
« previous next »
Pages: [1] Go Down Print
Author Topic: "Quick alignment"  (Read 4161 times)
jonnevin
Jr. Member
**
Offline Offline

Posts: 79



« on: August 19, 2008, 02:23:57 PM »

I have heard a few times prior to departure a plane will ask tower for a short delay so they can do a "quick alignment", what does that mean?
Logged
evilcuban
Jr. Member
**
Offline Offline

Posts: 66


« Reply #1 on: August 21, 2008, 09:08:30 AM »

It's to realign, check, or otherwise resync their IRS. 
Logged
jonnevin
Jr. Member
**
Offline Offline

Posts: 79



« Reply #2 on: August 21, 2008, 11:43:15 AM »

I will ask the followup naive question...what is IRS?
Logged
180MPH
Newbie
*
Offline Offline

Posts: 1


« Reply #3 on: August 31, 2008, 10:35:59 AM »

Inertial navigation, some aircraft have three separate units, some only have one, you feed in the Lat/Long to the unit and after it spins up it can detect what direction you are moving without any outside help from radio aids, in the old days a platform took about 30 minutes to spool up, a modern laser ring gyro can accurately sense a 1˚ change in angular displacement directly, and hence 7 minutes at mid-latitudes is sufficient to find the direction of true North.

An aircraft has to be stopped during this spool up process, an aircraft having an ir problem may attempt a quick alignment at the end of the runway to fix the problem.

180MPH
Logged
goowe
Jr. Member
**
Offline Offline

Posts: 59



WWW
« Reply #4 on: September 01, 2008, 07:55:22 PM »

I always wondered what this was as well -- thanks!
Logged

Alton (Joe) Anderson - AltonAnderson.com
Facebook me!
jonnevin
Jr. Member
**
Offline Offline

Posts: 79



« Reply #5 on: September 02, 2008, 12:35:36 AM »

thanks...that is very interesting
Logged
Pages: [1] Go Up Print 
« previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2011, Simple Machines Valid XHTML 1.0! Valid CSS!