Wednesday, September 12, 2018

Eagle eye challenge revealed

It's been over a month since I posted the Eagle Eye Challenge. Many of you responded, but for some unknown reason I didn't get any of your comments until the first week of September. During that time, I supposed that nobody was really all that interested, which is believable considering how infrequently I post updates nowadays. But now that that's been resolved, it's time to show you what you were looking for!

I opened above with the original shot of the Hawaiian A330. This was a shot of opportunity, and as such the photo had to be taken through the tower window shade, which both reduces the clarity and distorts the color. Imagine holding the dirty lens from a cheap pair of sunglasses in front of your camera lens to take a photo - that's the effect that I get when I have to shoot through the shades. The solution photo, taken a few moments later, was also shot through the shades, but I've tried to clean it up a little for you:

What's missing from this picture?
From this angle, it's clear that the Hawaiian Airbus is missing its left winglet. Apparently this aircraft had been involved in a ground incident with an American aircraft and the winglet was damaged in the process. At least one of you alluded to this in your comments. I wasn't there at the time, so I can't say of my own knowledge. In any case, Hawaiian operated the aircraft this way for a couple of weeks. I wonder how the flight crew explained it to the passengers?

This was the opening photo of the Eagle Eye post. This one attracted a wider range of responses, which I'll address shortly. But first, here's a highlighted version of this photo:

Now, a tighter shot that has less clutter:

And now, that shot with big arrows:

By now, it should be clear that what's happening here is something that, as a controller, you normally don't want to see: Two aircraft on the same runway, at the same time. What is taking place here is that an aircraft is holding in position part-way down the runway for an intersection departure while another aircraft is holding in position behind it. On the left side of the photo is a B747 holding in position on Ry25R; on the right side of the photo is a Gulfstream G-IV (I think) also in position on Ry25R at an intersection downfield. 

Here's a shot of the airport diagram with the intersections involved marked. I've deliberately printed it upside down (north bottom) because this is the same orientation as the above photos and is more representative of how the south side of the airport appears from the control tower: 

This edition of the chart will be obsolete by the time this blog post gets published. Not for navigation!

There are a number of limitations on this sort of operation at LAX, which is what makes it noteworthy. Without getting too geeky, I'll try to describe them:
  • The G-IV is at Taxiway G, which is only allowed to be used for an intersection departure if the runway is not available for arrivals, there is nobody cleared to land on it, AND the Local Assist position is staffed.
  • A jet aircraft is not normally allowed to depart from an intersection in front of another aircraft holding in position due to jet blast concerns. However, Taxiway G is far enough down the runway that it is allowed in this case.
  • The tower controller must be able to see both intersections clearly and must tell each aircraft about the other.
  • If you look closely, you can see that the B747 is also an intersection departure from Taxiway F. If the B747 was at the full length of the runway and the G-IV was at F, we would not be able to do this. However, if the B747 was at the full length of the runway and there was a propeller aircraft at F, the operation would be allowed. We do occasionally run that operation with a Cessna Caravan, Beech 1900, or E120 Brasilia (and others).
  • While we can perform this operation during the day, at night it would not be allowed because we are not able to put aircraft in position at an intersection after sunset.

Now I'll address a few of the other comments:

  • Several comments mentioned United aircraft at Terminal 7. The widebody at Gate 72 is actually a B787 (the wingtips give it away); B777s have also been known to utilize this gate. In order for the aircraft to fit, it has to be parked at that angle so as not to block the rest of the alley. This results in the loss of a gate; when only narrowbody aircraft are involved, there are two gates in that space: 72A & 72B. 
  • On the west side of Terminal 7 can be seen a United B757-300 at Gate 71B. We get B757-300s in both United and Delta colors, but they are not as ubiquitous as the shorter B757-200, which both airlines (and others) also operate at LAX. As was mentioned in the comments, the B753 also has to be parked at an angle to clear the alley. As a side note, each gate at LAX has a list of aircraft that can be accommodated at that gate. The tower controllers are aware of some of these, mainly the ones that involve restrictions on adjacent gates. This can occasionally be the cause for an aircraft being unable to go to the gate after landing: While the assigned gate might be open, the gate next door has a conflicting aircraft that will have to clear first.
  • There were a couple of comments about the cargo ramp. This photo was taken on a Monday, which is FedEx's layover day. Not many FedEx flights occur on Sundays, so their ramp tends to be full on Mondays. All of those aircraft will leave later in the day and evening. We don't normally get Prime Air at LAX, but we do have a couple of other operators with similar paint schemes.
  • Virgin America and Hawaiian both used to operate out of terminals on the north side of the airport. They were displaced to the south side when Delta moved all of its operations to the north side. Virgin America is now part of Alaska, and both of them are now at Terminal 6, which they share with Air Canada. Hawaiian is now at Terminal 5, which also has Allegiant, Frontier, Jet Blue, Spirit, and some American flights. Despite being parked on the south side, Virgin America/Alaska and Hawaiian will still sometimes be sent to the north side for departure, depending upon what their route of flight will be after takeoff. The same applies to the other carriers that park on the south side, while operators on the north side will sometimes be sent to the south side for departure for the same reason.
As I noted earlier, the airport diagram will not be current by the time this blog post gets published. Do not use it for navigation. You can get a current edition for free from the LAX airport page on AirNav:

Sunday, September 9, 2018

Construction update

Time for another batch of construction photos. I'll start with the newest (and most obvious) change: the crane that has been erected at the bottom of the D-8 alley for the Terminal 1.5 project. When it's not in use, it is normally parked in this position. Because the construction zone has encroached so far up into the D-8 alley, aircraft that push back in that alley must pull up to the top (where the Southwest B737 is) before starting engines to reduce jet blast.

Meanwhile, looking to the west, the north end of the Midfield Satellite Concourse (MSC) is progressing, with most of the glass installed. 

The southern end of the MSC is steadily nibbling into the American maintenance ramp and narrowing our view of Taxiway R. 

Look ma! No heliport!
The redesign of the Terminal 4 parking garage has taken away the emergency heliport. I think this was done in preparation for removing the bridge that currently connects the Terminal 3 and Terminal 4 parking garages in order to make room for the new "people mover" project.

I caught a few shots of the crane going up at Terminal 1.5:


This is an airport, so here's an airplane photo:

There's a bit of a story behind this shot. Lufthansa has introduced a new logo that replaces the yellow with a white logo on a blue background. So far, the only aircraft that I've seen with the new logo at LAX have been some of the Lufthansa Cargo MD11s, and I have yet to get a photo of one. These flights usually arrive and depart on the south side of the airport, and the control tower doesn't offer an ideal vantage point for shooting that side. This particular flight, however, arrived from the north and ended up on the north complex. Hoping to finally get a shot of the new logo, I had the camera out and ready. When I saw the airplane I was disappointed that it didn't have the new logo, but opted to shoot it anyway since I already had the camera out. It wasn't until later that I actually was able to take a good look at the photos and see that this plane was worth the effort.

Tuesday, September 4, 2018

Time Lapse project

Apologies to all of you who have posted comments over the last month or so. For some reason, they were not appearing to me to moderate until a few days ago. I still have some catching up to do, but in the meantime I'll share this project with you. It's my first attempt at this and I wasn't planning to put it out, but I figure you deserve something after seemingly having your comments ignored for a good chunk of the summer. As always, your comments (and critiques) are welcome. Enjoy!

Something I've wanted to try for a while is making a time lapse video of the aircraft movements at LAX. Using the control tower as a vantage point, I found some limitations because of the camera's field of view -- to see the entire terminal area will require a wider lens than what it has. So for this attempt I set the camera up overlooking the arrival end of the 24s, which is to say the east end of the north complex. We're looking straight out over Terminal 2, with the D-9 alley on the left side of the shot and the D-8 alley to the right. You'll see aircraft lining up on Taxiway E, departing on Runway 24 Left, and arriving on Runway 24 Right.

This was shot on Saturday morning between around 8 am and 10 am. It was a holiday weekend here in the states, so traffic was a bit lower than usual. Also, Saturday is the slowest day of the week at LAX -- we generally run a couple of hundred operations a day less on Saturdays than any of the other days of the week. To top if off, as you can see we had an overcast layer that kept things moving a bit slower than usual because we weren't able to use visual separation between aircraft. All of that to say that this is more relaxed than most mornings at LAX.

For this project I'm using a different camera -- a Panasonic Lumix DC-FZ80. Its lens can go down to 20mm, and it has the ability to shoot time lapse sequences. I set it to shoot at one frame per second, and the video plays back at ten frames per second, so this will be two hours of activity condensed into about twelve minutes of video. Because it's a time lapse video, there is no ATC audio, but I did add a music soundtrack. The video will play in the window above, but it's too small to see clearly, so I suggest letting it play full screen by clicking the little square at the bottom right.