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12 votes
Accepted

Approach plate does not require DME, but DME used in the published missed?

DME can be used in the published missed, but does not have to be. There are other ways to identify the missed approach fix. The missed approach instructions are: MISSED APPROACH: Climb to 1500 ...
J W's user avatar
  • 16.6k
9 votes
Accepted

What is needed in a plane to fly approach mode?

In order to "have the plane fly an ILS to minimums" - i.e. an autopilot-coupled approach - you'd need an ILS receiver (which would be comprised of both localizer & glideslope receivers) ...
Ralph J's user avatar
  • 51.5k
8 votes

Why are the minimums between these two ILS instrument approaches to the same runway so different?

The equipment requirement (in the aircraft) are different for each of these approaches. In the upper-left box of the Z approach, you can see that DME is required to make this approach. This ...
Jimmy's user avatar
  • 2,839
7 votes

What is the speed of the approach lights rabbit?

There are several different systems of Sequenced Flashing Lights, which is the official name for the "rabbit." Generally these flashing lights are spaced 200 feet apart. FAA Order JO 6850.2B ...
randomhead's user avatar
  • 15.2k
7 votes

Does a Tower controller need to see an aircraft on final to give landing clearance?

The FAA's ATC orders cover this for the US. Note that controllers can use radar instead of visual contact: 3−10−7. LANDING CLEARANCE WITHOUT VISUAL OBSERVATION When an arriving aircraft ...
Pondlife's user avatar
  • 71.7k
5 votes
Accepted

Is the callout "minimums" on the 737 used to describe DH on precision approaches

DA/DH and MDA/MDH both get a callout of "minimums". The pilot is expected to know (from having briefed the approach earlier) which meaning applies. This is true for every FMS/GPS I've seen, not just ...
StephenS's user avatar
  • 27.7k
5 votes
Accepted

What is the lowest RNP approach requirement without being RNP AR?

In ICAO DOC 9905 (Required Navigation Performance Authorization Required Procedure Design Manual) you can find the following definition in Chapter 2.1 RNP APCH versus RNP AR APCH 2.1.1 RNP ...
miceagol's user avatar
  • 261
4 votes
Accepted

How do GLS avionics plot an entire accurate approach path?

The best reference is the ICAO GBAS Guide. Unfortunately, it doesn't have diagrams to help understand it. The Final Approach Segment (FAS) is a geodesic path to the runway. It is horizontally ...
Gerry's user avatar
  • 19.8k
3 votes
Accepted

Where can I find details about necessary system accuracy, integrity etc of a conventional navigation aid?

These details can also be found in ICAO Annex 10 - Volume 1 Radio Navigation Aids. This is from the table of contents of the Seventh Edition (from 2018): CHAPTER 1. Definitions CHAPTER 2. General ...
Bianfable's user avatar
  • 55.9k
3 votes
Accepted

At what point can Approach mode be engaged in an A320?

The conditions for arming the ILS APPR mode are given in the FCOM: Arming Conditions The pilot arms the (ILS) APPR mode (LOC and G/S in blue on the FMA) by pushing the APPR pushbutton on the FCU, ...
Bianfable's user avatar
  • 55.9k
3 votes

How can I find examples of airports with specific approach types?

All ASR and PAR approaches are listed in the current Terminal Procedures Packet. They are not listed with the other approaches but in the front matter after the alternate airport section. I have ...
wbeard52's user avatar
  • 12.7k
3 votes

Can Instrument Approaches be carried out when RVR is not given for the full runway length? (Approach Ban)

To perform an ILS CAT I approach, at least the touchdown zone RVR sensor must be operational. For CAT II, you need the touchdown zone and midfield sensors, and for CAT III you need all three. As per ...
60levelchange's user avatar
2 votes
Accepted

What is an obstacle identification surface and why would a pilot intentionally penetrate it during an ILS approach?

Obstacle Identification Surfaces apply to departures and the portion of an non-precision IAP beyond the Visual Descent Point. If you are in the clouds, you should never penetrate the OIS on departure. ...
JScarry's user avatar
  • 7,464
2 votes
Accepted

Are there any precision approaches that use only GNSS/LAAS?

The FAA has an FAQ on GBAS (ground-based augmentation of GPS/GNSS). It says they no longer use the term LAAS, instead they now use GBAS to be consistent with ICAO terminology. A GBAS approach is ...
Pondlife's user avatar
  • 71.7k
2 votes

During an LPV or GLS final approach, can the extension of the aircraft's cross-section line intersect with the Y or X OCS surfaces?

The OCS is the edge of the safe flight 'corridor.' It defines a safe volume of airspace for the approach. Since it's normal to have obstacles off to the side of the approach path the OCS typically ...
Gerry's user avatar
  • 19.8k
2 votes

Logging Instrument approach if if entering IMC past the FAF, but in VMC before and passing the FAF

Yes, IAPs are designed to bring aircraft down through IMC conditions to the airport environment to make a landing. If IMC conditions are encountered at any point between FAF and DA/MDA, the approach ...
SMS von der Tann's user avatar
2 votes
Accepted

What are the meanings of the codes depicts in the square brackets? For example: [MDØ68]

According to the INTRODUCTION TO JEPPESEN NAVIGATION CHARTS on page 78 14 Jeppesen-derived database identifiers are depicted when different from State-supplied name.
Jim's user avatar
  • 1,063
1 vote

Logging Instrument approach if if entering IMC past the FAF, but in VMC before and passing the FAF

FAA InFO 15012 says that the approach must be done under actual or simulated instrument conditions, or a combination thereof, with the aircraft being operated solely by reference to instruments, for ...
Chris's user avatar
  • 15.6k
1 vote

Why don't LPV approaches use WAAS GPS for DA

I'm pretty sure it's an artifact of the conservatism applied to the certification of WAAS LPV approaches. From a certification standpoint, the assumed vertical precision of GPS is not considered ...
John K's user avatar
  • 131k
1 vote

What is the speed of the approach lights rabbit?

The "flashers" part of the system is only 1400 feet long (the 15 red triangles in the diagram on the page you linked to). If the lights blink twice per second, we can set a lower bound on ...
abelenky's user avatar
  • 30.7k
1 vote

Is this an accurate method to showing how the correct Decision Altitude/Height for an approach has been determined?

This is USA information. The summary: determine the obstacle clearance surfaces, add the required obstacle clearance buffers to those surfaces, adjust DA for glide slope angle and aircraft speed if ...
Max Power's user avatar
  • 2,604
1 vote

How can I find examples of airports with specific approach types?

An ASR approach is an Approach Surveillance Radar style approach. The guys on MZeroA.com flew one in this video at KLAN. They are not "at" any airport nor are there plates for them it is effectively a ...
Dave's user avatar
  • 101k
1 vote

Does a Tower controller need to see an aircraft on final to give landing clearance?

No, a tower controller does not need to have an aircraft in sight in order to issue a landing clearance. There may be some variations upon this basic rule depending on jurisdiction. I am speaking ...
J W's user avatar
  • 16.6k

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