When am I established on IAP

[BoilerAV8TR]

What is the definition of established on a segment of an IAP. Inside the IAF/IF is a given, but is it case break for a VOR/LOC and + or - 5 degrees of an NDB?

 

[Amish RakeFight]

ICAO Definition:

ILS/LOC/VOR/GPS - 1/2 scale deflection.

NDB - within 5 degrees.

 

[say again]

ICAO Definition:

NDB - within 5 degrees.

I guess Ive never been established on one of these, sh!t, Im lucky to be within 15 degrees.:beer:

 

[Amish RakeFight]

I guess Ive never been established on one of these, sh!t, Im lucky to be within 15 degrees.:beer:

Don't worry, you've got company!

 

[BoilerAV8TR]

hey amish can you give me an icao reference for that. The only published thing i can find is Positive Course Guidance inside of the minimum criteria for your pilot certificate?

 

[Amish RakeFight]

From the FAA Instrument Procedures Handbook:

You must be established on course before a descent is
started on any route or approach segment. The ICAO
Procedures for Air Navigation Services – Aircraft
Operations (PANS-OPS) Volume I Flight Procedures,
specifies, “Descent shall not be started until the aircraft
is established on the inbound track,” and that an aircraft
is considered established when it is “within half full
scale deflection for the ILS and VOR; or within ±5
degrees of the required bearing for the NDB.”

In the AIM “established” is defined as “to be stable or
fixed on a route, route segment, altitude, heading, etc.”
The “on course” concept for IFR is spelled out in Part
91.181, which states that the course to be flown on an
airway is the centerline of the airway, and on any other
route, along the direct course between the NAVAIDS or
fixes defining that route.

 

[BoilerAV8TR]

many thanks

 

[MarineGrunt]

Yup. ICAO is 1/2 scale, FAA = case break.