# Tag Info

Accepted

### What does the instruction "Climb heading [BEARING] to [NAVAID] 2.5 DME" mean?

DME is "Distance Measuring Equipment". It tells you how far you are from the equipment transmitting the signal. This is often co-located with a VOR, or at an airport. turn heading 180 degrees to ...
• 34.1k
Accepted

### Why would an approach be Cat A NA?

Original answer: The speed of Category A aircraft is too low to execute the missed approach. For this particular airport, it's basically a hole in the ground with steep mountains on all sides. To go ...
• 2,859

### Why are there no RNAV (ILS) approaches?

You are confusing some terminology. RNAV (GPS) approaches can have several different sets of minima. See the example RNAV (GPS) Y 28L at O'Hare: It has: LPV LNAV/VNAV LNAV sets of minima. LPV is an ...
• 485

### Why are there no RNAV (ILS) approaches?

The gist of your question is whether it is possible to couple RNAV with ILS? The following ILS chart of Cochin Airport (VOCI) is an ILS approach where Initial and Intermediate approach are executed ...
• 376

### Which US airport has the lowest circling MDH?

I'm going to partially answer this question. According to TERPS Section 2-7-1(b), the minimum ROC in the circling approach OEA is 300 feet. Adjustments must be applied as specified in paragraph 3-2-2....
• 8,584

### Why are there no RNAV (ILS) approaches?

RNAV(GPS) procedures being combined with LPV or LNAV/VNAV, which are Landing Systems Your confusion here is that LPV is a landing system which it is not. It is a way of saying your GPS is going to ...
• 101k
Accepted

### How much difference in heading/bearing between consecutive legs is "officially" considered a turn?

I will have to answer my own question, since I have noticed that in FAA's PBN Manual it states: PBN 8260.58A 1-2-5c . Turn parameters. For OEA construction, a turn is indicated when the course ...
• 1,853

### PA/APV Glidepath Descent and Obstacle Clearance Slope's lowest point determination

I can't yet find where this is indicated in TERPS, but it appears that the OCS surface starts at the point before the threshold where the GP is 250 feet above the threshold height. I'm inferring that ...
• 28.6k
1 vote
Accepted

### Is the arrival segment of an IAP in PANS-OPS the equivalent of FAA's feeder route?

An arrival segment can be part of both an arrival route and a designated STAR. Both are protected with the same design criteria. The STAR chart consist of designated routes linking the approach ...
• 261
1 vote

### Why are there no RNAV (ILS) approaches?

Only one of the previous answers has emphasized the most important misunderstanding in this question. PBN, LPV, LNAV/VNAV, LNAV-Only, etc, are not landing systems. They are criteria by which landing ...
• 16.5k
1 vote

### Why are the minima for Cat A higher than for other categories at KSEA ILS 16L?

The minima's are usually decided based on the Missed Approach procedure, which one of the criteria being obstacle clearance. I believe the answer lies in your question, its due to the heading course ...
• 113
1 vote

### What are early/inside and late/outside turns (see, e.g., PBN Manual Order 8260.58A) and when do pilots perform them?

I think what you're talking about are what pilots refer to as "fly-past" and "fly-over" waypoints. Up until recently, all waypoints in the world were "fly-past", ie you could cut the corner from one ...
• 4,626
1 vote

### Why does obstacle clearance area splay outward instead of being a rectangle?

Because the navigational beacons and the indicator instruments in the cockpit are such that the system is less precise at longer distances. Second the plane must find the initial fix or intersection ...
• 2,604
1 vote

### PA/APV Glidepath Descent and Obstacle Clearance Slope's lowest point determination

See Formula 10-2-2, "Slope Origin Distance," and Figure 10-2-3. The distance is equal to 200 feet or $$1154 - \frac{\rm TCH}{\tan({\rm GPA})}$$ feet, whichever is greater.
• 16.9k
1 vote

### On a procedure turn, do you make the turn on the inside or outside of the procedure turn?

Look at the top left of the profile view, you see "Remain within 10nm" you can do the turn however you want as long as you remain with in 10nm. A 172 may have no problem staying inside 10nm if they ...
1 vote

### On a procedure turn, do you make the turn on the inside or outside of the procedure turn?

I agree with all the above references to AIM 5-4-9, Instrument Flying Handbook and Instrument Procedures Handbook. Personally, I use whichever course reversal that suits best for the given wind ...
1 vote

### Are crossing restrictions on an ILS/LOC approach mandatory when flying on the glideslope?

Think of it this way ... Before the published glideslope interception point (lightning bolt symbol) we must respect all published crossing altitudes even in receiving a glideslope signal. Once inside ...
• 11

Only top scored, non community-wiki answers of a minimum length are eligible