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107 votes
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What are these criss-cross patterns close to Cambridge Airport (UK)?

In 2017 there was a major archeological dig in the area of Hatherdene Close and Coldhams Lane at the south end of the Cambridge airport. The "criss-cross patterns" are additional exploratory trenches ...
Mike Sowsun's user avatar
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74 votes
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Why are Oscar, India, and X-Ray (O, I, and X) not used as taxiway identifiers?

Because those symbols are easily confused with the number 0, the number 1 and the symbol for a closed runway/taxiway (✕) respectively. (1) Numbers by themselves, and the letters "I" ...
60levelchange's user avatar
57 votes
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Why are taxiway and runway centerline lights off center?

The painted line and the lights do not align for a very practical reason: it would be a major pain in the behind to paint over the lights, as each one of them would need to be masked for the painting, ...
Jpe61's user avatar
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37 votes
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What does RTF mean?

"RTF Instructions" probably means "Radiotelephone Instructions" As suggested here, it should not be confused (as I initially did) with the "RTF" of internet fame (from RTFM, for those that are still ...
Federico's user avatar
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36 votes
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How are the dry lake runways at Edwards AFB marked, and how are they maintained?

They use oil, specifically SSH1 which is environmentally friendly. This oil replaces the tar that used to be used. Source: Rebecca Amber, Can you see me now? Lakebeds 'restriped', Edwards Air Force ...
Jim's user avatar
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35 votes
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What is "judgemental oversteering" in taxi procedures?

"Judgmental oversteering" means to intentionally not follow the taxiway centerline when turning. It is a technique used on large aircraft to turn on tighter or smaller taxiways. In a sense, it is ...
kevin's user avatar
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32 votes
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What are the slash markings on Gatwick's 08R/26L?

They are "Rapid Exit Taxiway Indicator Lights" as described in section 9.6 of CAP 637. 9.6 Rapid Exit Taxiway Indicator Lights 9.6.1 Rapid exit taxiway indicator lights (RETILs) ...
Greg Hewgill's user avatar
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31 votes
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What is this radar-like thing?

It is a wind tee; it serves the same function as a wind sock. It is designed to resemble an airplane from the air so that pilots overflying the field can more easily determine in which direction they ...
Devil07's user avatar
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29 votes
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What is this white rectangle painted on runway 23 at KCRW?

Seems to be touchdown zone markings for assault landing practice by C-17's. For assault landings, the standard is to touch down in the first 500' of the Landing Zone (LZ), and to go around if your ...
Ralph J's user avatar
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27 votes

What are these large yellow circles painted across the runway?

That would be the "line" telling military pilots where the arresting cables are. If you look to the side of those circles, you can see the arresting mechanism these. It would be yellow so that it ...
SMS von der Tann's user avatar
26 votes

Why are lat-lon coordinates written at parking bays in civil airports?

These checkpoint coordinates are used to verify the current location of the aircraft for navigation purposes. The coordinates can be used to check, input or calibrate the navigation system's current ...
JetCityMatt's user avatar
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24 votes

What is this radar-like thing?

It's a lighted 'wind tee'. this website shows various wind direction indicators
Bageletas's user avatar
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24 votes
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What are these devices on or adjacent to an airport taxi-way?

It is not a road that you are looking at, it is the edge of the runway / taxiway. The double yellow lines are used to define the taxiway edge from the shoulder or some other abutting paved surface ...
DeltaLima's user avatar
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22 votes
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What are these large yellow circles painted across the runway?

A large number of airports in the world are used for both civil and military operations and quite a few of these have arresting systems installed on them. According to Boeing Aero No. 13: Of the ...
aeroalias's user avatar
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22 votes
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What are these symbols on the runway?

The first one is the holding position marking. It denotes the entrance from the taxiway into the runway. The dashed lines are in the side of the runway. The second one is the non movement area ...
aeroalias's user avatar
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18 votes
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What is this odd large sign near Aalborg airport/millitary airport?

It's a maritime navigation aid. I'm fairly rusty, but I'm pretty sure it's a form of lead mark. When seen from the water, as you travel towards the mark, if you keep the diamond centred between the ...
Mackk's user avatar
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18 votes

FAA Commercial Pilot Knowledge Test: Sign Question

This sign is a taxiway ending marker. I retrieved this graphic from the CFI Notebook Website.
DLH's user avatar
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18 votes
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Why are lat-lon coordinates written at parking bays in civil airports?

If you are referring to GPS coordinates shown at the gates, as in this image: Source: ADB Safegate the reason is: to allow the pilots to properly prime their inertial navigation system with a known ...
randomhead's user avatar
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17 votes
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What does the sign "Caution your blast" mean?

I'm fairly sure that sign is beside taxiway C*, and as you can see from the aerodrome chart it is right next to the main apron. Aircraft holding in this position have the main apron directly behind ...
Jamiec's user avatar
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17 votes
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What is the meaning of this airport marking?

The marking indicates that vehicles must yield to aircraft. It is placed in areas where a service road crosses a taxiway.
60levelchange's user avatar
15 votes
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What are the areas marked in green around the taxiways?

It's essentially "fake grass" -- a "no taxi" / "no drive" area, the same as real grass would be. The concrete may very possibly be stressed to support the full weight of big aircraft, and the areas ...
Ralph J's user avatar
  • 51.8k
14 votes

What are these devices on or adjacent to an airport taxi-way?

The item in the red box looks like a plastic stick that has reflective stickers on it which identify the taxiway edge even when there are several inches of snow (enough to bury the taxiway lights). ...
Ralph J's user avatar
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13 votes

What does a "runway hold position sign" denote?

You are correct that the general idea of a "runway hold position" sign is to keep aircraft from hitting each other, but that applies to all three answers. You need to tighten your focus a ...
randomhead's user avatar
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12 votes
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Yellow chevron markings at end of runway, what do they mean?

Those are not chevrons but arrowheads used to mark the start of the runway. So, yes, he did land on the taxiway. Source: FAA Airfield Standards Quick Reference He does land slightly before the ...
TomMcW's user avatar
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