Go Back  PPRuNe Forums > PPRuNe Worldwide > The Pacific: General Aviation & Questions
Reload this Page >

IFR cruising altitude below LSALT in day VMC

Wikiposts
Search
The Pacific: General Aviation & Questions The place for students, instructors and charter guys in Oz, NZ and the rest of Oceania.

IFR cruising altitude below LSALT in day VMC

Thread Tools
 
Search this Thread
 
Old 9th Jan 2009, 01:41
  #1 (permalink)  
GBO
Thread Starter
 
Join Date: Mar 2008
Location: Australia
Posts: 118
Received 5 Likes on 1 Post
IFR cruising altitude below LSALT in day VMC

Can I fly at an altitude below LSALT in day VMC, when operating under the IFR between two non towered aerodromes 40 NM apart?

G'day all. Just a little confused by the above question.

Reading CAR 178 and Jepps para 3.6.6 on page AU-806 Air Traffic Control section, the answer would be YES.

But reading Jepps para 1.6 on page AU-15 Terminal section and Jepps para 3.16 on page AU-23 Terminal section, I cannot conduct a Visual Approach from an altitude below LSALT, thus I must climb to LSALT, making the answer NO.

Thoughts?
GBO is offline  
Old 9th Jan 2009, 02:11
  #2 (permalink)  
 
Join Date: Sep 2007
Location: Australia
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
Use your common sense
Gundog01 is offline  
Old 9th Jan 2009, 02:13
  #3 (permalink)  
 
Join Date: May 2003
Location: Somewhere around 27degrees
Posts: 170
Likes: 0
Received 0 Likes on 0 Posts
If you are visual by day & thus can ensure your own terrain separation, you can get to the circling area however you please!

To put the answer more into the context that I think you were hoping for; you could continue to a point where the critical obstacle has been passed and revise your LSALT so that it is sufficiently lower, or alternatively, continue until you are close enough to the destination such that you are above the appropriate MSA/DME/GPS step as per para 3.16. Either of these should enable you to conduct a visual approach at most fields IAW the above para.

Hope that helps.
Reverseflowkeroburna is offline  
Old 9th Jan 2009, 03:41
  #4 (permalink)  
 
Join Date: Apr 2005
Location: Bleak City
Posts: 229
Likes: 0
Received 0 Likes on 0 Posts
Use your common sense
En-Rooter is offline  
Old 9th Jan 2009, 03:52
  #5 (permalink)  
 
Join Date: Apr 2006
Location: Australia
Posts: 78
Likes: 0
Received 0 Likes on 0 Posts
visual by day

if you're OCTA and visual by day then all you ultimately need to do is meet the VFR height requirements, i.e. 500ft AGL or 1000ft over populated places, racecourses and all that hoo hah. A good example would be flying over some high terrain in an aircraft without ice protection and getting as low as possible (visually) to avoid the freezing level.

On a good day you can often see a metro freighter swing by Byron Bay lighthouse at 500ft going from Ballina to the Gold Coast. Just ask ATC for amended tracking "500ft over water" and they'll tell you "no IFR traffic, contact GC tower for a clearance at x DME." Just keep an eye out for those kite surfers!
roger_ramjet is offline  
Old 9th Jan 2009, 04:55
  #6 (permalink)  
 
Join Date: Feb 2006
Location: Aust
Posts: 378
Likes: 0
Received 0 Likes on 0 Posts
Jepps para 1.6 on page AU-15 Terminal section
GBO, have a look at the title at the top of the page....

INSTRUMENT APPROACH/TAKEOFF PROCEDURERS

and Jepps para 3.16 on page AU-23 Terminal section
and again, read it carefully.....

Subject to the requirements of visual circling, missed approach and visual segments paragraphs above, the pilot need not commence or may discontinue the approved instrument procedure to that aerodrome blah blah blah.........

neither of the above two refer to what you are eluding to doing....

and if you are wondering about the remark of a 'visual segment' in the above, it only refers to a visual segment that is part of a published instrument approach. Not tracking in VMC. You will find that in Terminal AU-23 Para 3.15 (right above where you are getting yourself confused)
Monopole is offline  
Old 9th Jan 2009, 06:34
  #7 (permalink)  
 
Join Date: Dec 1999
Location: I prefer to remain north of a direct line BNE-ADL
Age: 49
Posts: 1,286
Likes: 0
Received 33 Likes on 10 Posts
The Visual Approach requirement from LSALT assumes you have descended in IMC, either way unless you have to go IFR just go VFR, if IFR is required then I would say its no problem if you have VMC conditions. Sometimes you need to take all the regulations into account but at the same time act sensibly, if it still exists! hehe oh yeah someone said common sense already! Unfortunately in our current society common sense gets commonly lost in a plethora of Certain Regulatory Authority Procedures. Otherwise known as CRAP!
Angle of Attack is offline  
Old 9th Jan 2009, 06:55
  #8 (permalink)  
Sprucegoose
 
Join Date: Sep 2000
Location: Hughes Point, where life is great! Was also resident on page 13, but now I'm lost in Cyberspace....
Age: 59
Posts: 3,485
Likes: 0
Received 1 Like on 1 Post
Can I fly at an altitude below LSALT in day VMC, when operating under the IFR between two non towered aerodromes 40 NM apart?
You can and you should, whenever the weather conditions permit!

You need to take timeout sometimes to take in the view!
Howard Hughes is offline  
Old 9th Jan 2009, 06:57
  #9 (permalink)  
 
Join Date: Sep 2007
Location: Australia
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
GBO

I possibly could have been more constructive in my first post. I am an AIP man myself,

ENR 11.6.5 Minimum Altitude requirements. During the conduct of a visual approach, a pilot must descend as necessary to:
a. by day:
(1) for an IFR flight, remain not less than 500ft above the lower limit of the CTA (not applicable)
(2) for IFR and VFR flights, operate not below the lowest altitude permissible for VFR flight (CAR 157)

Therefore the only requirement when OCTA (as stated by roger ramjet) is VFR height (500 or 1000) until circling area, or 5nm aligned (7 for an ILS) blah blah blah.....
Gundog01 is offline  
Old 9th Jan 2009, 07:03
  #10 (permalink)  
 
Join Date: Aug 2001
Location: Australia
Posts: 130
Likes: 0
Received 0 Likes on 0 Posts
The question is: Can I fly at an altitude below LSALT in day VMC, when operating under the IFR between two non towered aerodromes 40 NM apart?

My question is: How can you fly under the IFR below the LSALT between two airports 40nm apart?

I can understand it if you are a P3 Orion with a search radar and two navigators intending to fly over the ocean but needing to leave Edinburgh in the pouring rain and arrive in Townsville in a thunderstorm, but flying from WoopWoop1 to WoopWoop2.....I don't get it.
MrApproach is offline  
Old 9th Jan 2009, 07:25
  #11 (permalink)  
Hasselhof
Guest
 
Posts: n/a
My question is: How can you fly under the IFR below the LSALT between two airports 40nm apart?
Umm... by remaining in VMC? IFR is a set of rules, not met conditions. It just lets you fly through IMC as well as VMC.
 
Old 9th Jan 2009, 08:34
  #12 (permalink)  
 
Join Date: Jun 2006
Location: Wherever the hotel drink ticket is valid
Posts: 281
Likes: 0
Received 0 Likes on 0 Posts
I think the point being made here is if you are below LSAlt (and not complying with a visual departure or approach procedure as specified in Term), then you are by definition flying under the Visual Flight Rules (which require VMC). You are no longer flying under the Instrument Flight Rules, as those rules require you to be above a LSAlt.

In the 40 nm example you are covered by the fact that you can descent below LSAlt within 30nm of an aerodrome and can therefore be considered to be conducting visual departure/arrival under the IFR.

If you're IFR - you have to fly according to the IFR. If you want to admire the view or get a bit lower, then by definition your are flying under the VFR.
Icarus53 is offline  
Old 9th Jan 2009, 08:34
  #13 (permalink)  
 
Join Date: Apr 2004
Location: Up The 116E, Stbd Turn at 32S...:-)
Age: 82
Posts: 3,096
Received 45 Likes on 20 Posts
Is that like IFR 'Category'
and VFR 'Procedures'?
Ex FSO GRIFFO is offline  
Old 9th Jan 2009, 08:42
  #14 (permalink)  
 
Join Date: Sep 2007
Location: Australia
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
You are no longer flying under the Instrument Flight Rules, as those rules require you to be above a LSAlt.
Since when must you be above LSALT to operate under the IFR?? Never heard of this. Have you got a reference in AIP??

We (Mil) regularly operate IFR at 250ft AGL without any problems. Reporting Scheds for SARWATCH and stick to your flight plan. Although this might be a special Mil exception.
Gundog01 is offline  
Old 9th Jan 2009, 08:55
  #15 (permalink)  
 
Join Date: Apr 2008
Location: over there
Age: 35
Posts: 486
Likes: 0
Received 1 Like on 1 Post
i;d say that is a special MIL procedure.

IFR below LSALT in VMC is fine, you just need to maintain VMC min heights eg 500ft agl of 1000ft agl over populated areas
AussieNick is offline  
Old 9th Jan 2009, 09:30
  #16 (permalink)  
 
Join Date: Dec 2003
Location: The Y
Posts: 17
Received 0 Likes on 0 Posts
Jepp Climb and Cruise 3.6.6

An aircraft must not be flown under the IFR lower than the published lowest safe altitude .................blah blah ,or except during VMC by day (CAR 178 refers).

All you need to do is tell ATC your tracking point A to point B visual. SAR watch trafic etc will still be provided.
leg man is offline  
Old 9th Jan 2009, 10:52
  #17 (permalink)  
 
Join Date: May 2002
Location: Permanently lost
Posts: 1,785
Likes: 0
Received 0 Likes on 0 Posts
Quote:
Can I fly at an altitude below LSALT in day VMC, when operating under the IFR between two non towered aerodromes 40 NM apart?

You can and you should, whenever the weather conditions permit!

You need to take timeout sometimes to take in the view!
I have.

For fecks sake guys, what is so difficult here? Why must we reduce a simple question to something worthy of a High Court appeal?

Every now and again I have a clinic run that goes to two communities that are 23nm apart. The whole flight is done on an IFR plan, but the departure report (through Flightwatch on HF ) advises that the flight will be proceeding visually at a VFR altitude. All other radio calls are as for an IFR flight. Simple adaptation to avoid an unwanted climb to altitude.
PLovett is offline  
Old 9th Jan 2009, 10:54
  #18 (permalink)  
 
Join Date: Jul 2001
Location: The Ponderosa
Age: 52
Posts: 845
Received 16 Likes on 6 Posts
let me guess, NBR-MRZ and your a qantaslink trainee/cadet?

was i correct?

anyway the answer is yes, unless the FAM has changed. have fun at A020.

hoss is offline  
Old 9th Jan 2009, 12:30
  #19 (permalink)  
 
Join Date: Oct 2006
Location: Brisbane
Posts: 29
Likes: 0
Received 0 Likes on 0 Posts
You can do it

From the AIP's (GEN section):

An aircraft must not be flown under the IFR, lower than the
published lowest safe altitude or the lowest safe altitude calculated
in accordance with this section, except
when being assigned
levels in accordance with ATS surveillance service terrain
clearance procedures or when being flown in accordance with a
published DME arrival, instrument approach or holding procedure,
or except when necessary during climb after departure from an
aerodrome, or except during VMC by day (CAR 178 refers).

Therefore in your example GBO you can fly below LSALT.


BOK
BOK_ is offline  
Old 9th Jan 2009, 22:39
  #20 (permalink)  
 
Join Date: Sep 2007
Location: Australia
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
Legman/BOK

Was aware that obviuosly IMC/night you must be above an LSALT/DME/GPS step, etc for IFR when IMC.

Me thinks Icarus53 didn't RTFQ.

You are no longer flying under the Instrument Flight Rules, as those rules require you to be above a LSAlt.
Which clearly asked about the day VMC case.
Gundog01 is offline  


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.