Min altitude during a procedure turn

[memooch]

Also, temp errors can be considered, but the most likely place for real peril to occur would be a medium to high PT in mountainous terrain, with very cold temperatures.
...
This is because the cold-wx error compounds with altitude above the altimeter reporting station, not your height MSL.

We also have 2,000' obstacle clearance over mountainous terrain, right?

 

[philo beddoe]

Not on prcedure segments.
Just MEA's, MOCA's, and grid MORA's.
Not even on MSA's.
Y'all be careful out there!

 

[philo beddoe]

JRSLim needs to lighten up a bit. PTS will always keep you alive in IMC.

 

[Singlecoil]

Not on prcedure segments.
Just MEA's, MOCA's, and grid MORA's.
Not even on MSA's.
Y'all be careful out there!

That is such an excellent point. I've had ground prox warnings on cold days in mountainous terrain in Oregon and Montana while being vectored. Querying the controller about their MVA's has revealed that they are 1000 agl and they make no correction on cold days, meaning they think you are 1000 agl because that is what your mode C reports, but in reality you are lower due to non-standard temperature as revealed by your radar altimeter and ground prox. Why ATC can't feed temperature into their computers like they do non-standard pressure is beyond me.

 

[philo beddoe]

Generally true obstacle protections are

1000ft normal, 2000ft mountainous:
* MEA
* MOCA
* MORA/OROCA (Jepp/NOS)
* Normal hold
* Missed approach holding point (Not sure on this one)

1000ft (generally)
* App plate MSA
* Procedure turn (primary area)
* Teardrop course reversal (primary area)
* Ractrack course reversal (primary area)

500ft (generally)
* Intermediate segment (PT inbound to FAF)
* Procedure turn (secondary area)
* Teardrop course reversal (secondary area)
* Ractrack course reversal (secondary area)

ILS
* Varies, can be as low as 120' or so

VOR/LOC/BC/GPS/DA/SDF
* 250/300ft above the controlling obstacle (FAF/no FAF)

NDB
*300/350ft above the controlling obstacle (FAF/no FAF)

Local conditions can cause these minima to be modified.

 

[philo beddoe]

Forgot one - oops!

Circling approach
* No less than 300ft above the controlling obstacle
* Never less than 350ft agl for cat A
* No less than 450 agl for cats B&C

 

[scangadah]

I was waiting for sombody to post that. Good Job Philo!
(dang, there are some smart Bastids on here) Ok i will go back and finish my
Beer(s)