Welcome, Guest. Please login or register.
Did you miss your activation email?
December 19, 2014, 07:00:09 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)
| | |-+  Speed readings
« previous next »
Pages: 1 [2] Go Down Print
Author Topic: Speed readings  (Read 10261 times)
znymz
Newbie
*
Offline Offline

Posts: 14


« Reply #15 on: December 01, 2005, 01:21:05 PM »

In general atc use it will split around FL280... above we use mach number, below we use TAS (true air speed)
Logged
binky
Newbie
*
Offline Offline

Posts: 42


« Reply #16 on: December 01, 2005, 01:30:02 PM »

With regards to the above post, ATC will issue speeds as IAS not TAS.  TAS or Mach # filed will appear on flight progress strips but TAS isnt used.
Logged
PHL Approach
Hero Member
*****
Offline Offline

Posts: 743



« Reply #17 on: December 01, 2005, 03:01:52 PM »

I think he would know that.... After all he is a RW controller. I think you misunderstood.
Logged
znymz
Newbie
*
Offline Offline

Posts: 14


« Reply #18 on: December 02, 2005, 12:32:28 PM »

I stand corrected, brain fart, below FL280 it's IAS, Indicated Airspeed.
Logged
binky
Newbie
*
Offline Offline

Posts: 42


« Reply #19 on: December 02, 2005, 03:12:34 PM »

PHL, erroneous information needs to be corrected here whether it is was given by a real controller or hobbyist.  No disrespect but 'RW controllers' make mistakes/brain farts like everyone else.
Logged
cal737pilot
Newbie
*
Offline Offline

Posts: 7


« Reply #20 on: December 02, 2005, 11:08:46 PM »

The use of mach and airspeed are generally divided up based on altitude.

FL290 and below, ATC/pilots will reference speed in IAS (Indicated Airspeed).

FL300 and above, ATC/pilots will reference speed in MACH.

Note:  There is an occational exception to the rule.  I have had controllers ask for our speed in indicated while flying above FL290 because an A/C in front of us that he was sequencing us behind, was at FL290 and gave his speed to ATC in knots.

Hope that helps.
Logged
Ronski
Jr. Member
**
Offline Offline

Posts: 60


« Reply #21 on: December 03, 2005, 03:21:01 PM »

rolleyes  rolleyes Over the last two pages, I notice that Mach Speeds start at:
     
    FLs 240, 250, 260 and the last post, 290. huh
Logged

"Who am I to blow against the wind"
davolijj
Hero Member
*****
Offline Offline

Posts: 548


MMAC ARSR OKC


« Reply #22 on: December 03, 2005, 04:16:35 PM »

Quote from: Ronski
rolleyes  rolleyes Over the last two pages, I notice that Mach Speeds start at:
     
    FLs 240, 250, 260 and the last post, 290. huh


From FAAH 7110.65
5-7-1 Speed Adjustment

e. Express speed adjustments in terms of knots based on indicated airspeed (IAS) in 10-knot increments. At or above FL 240, speeds may be expressed in terms of Mach numbers in 0.01 increments for turbojet aircraft with Mach meters
(i.e., Mach 0.69, 0.70, 0.71, etc.).

As for what the Center guys actually use...you'll have to ask them.
Logged

Regards
JD
Pages: 1 [2] 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!