Archive for 2009

The Aircraft Light Types and Meanings

Question:

Often we see with the lights on the plane during flight, sometimes blinking sometimes steady. Is the light aircraft function the same as land vehicles for street lighting and whether the pilot is obliged to always turn on the lights during night flight?

Answer:

Three Aircraft Light Types

The light function is the same everywhere, which is to illuminate something, or so it can be seen by the other party as a navigation aid. Anyway, for an aircraft there are many different lights with different colors and has been a general agreement that the outer lights located on the left is colored Red, while on the right is colored Green. Broadly speaking there are only two aircraft light positions that are within the cabin is known as the internal light and outside the cabin is called external light.

In an aircraft there are a variety of external light. Namely Landing and Taxi Light, Runway Light, Scan Light, Wingtip Light, Navigation Light, Anti-Collision Light, Strobe Light, and sometimes there is also called the Auxilliary Light used to illuminate the vertical stabilizer to make company logo visible. While for some military aircraft there are other external lights, eg. Formation Light and Probe Light. All types of lamps are lit only when necessary.

In the aviation world flight safety is the primary consideration, for it had lights installed other than as a means of lighting it’s also to confirm the existence of such aircraft visually. Therefore some aircraft lights related to navigation safety must be lit, for example strobe lights and landing lights when going to landing, because the other function of the landing light is a sign that the wheel of the plane has been lowered. Only the taxi and runway lights used as pilot instrument to lighting the runway at night, the rest serves as the safety requirements of flying.

In addition, the angle of the light beam comply to the standard provisions with the aim that by looking at it then the direction or heading of the aircraft can be predicted. Red navigation lights (left) has an 110 degrees angle, the opposite on the right has the same angle as well, while the White navigation lights (rear) has an angle of 170 degrees. This beam angle is also applicable to military aircraft and should always be lit at night or during the day, along with strobe light.

In military aircraft there is a so-called formation light, judging by the name it serves as visibility aid in the flight formation at night. This lamp is positioned at three spots, by comparing the triangular shape of the three lights on other aircraft, the pilots will be able to estimate the distance and position relative to the flight leader. Formation light on some of today’s aircraft fighter has been replaced with a reflector (spot light) with the same function. While the probe light function is to illuminate the probe (a device for fighter aircraft (air-refueling) when it will conduct refueling at night. In basket (of the tanker aircraft), there is a reflector, by looking at the reflector shape and size it will look like a circular ring, the fighter pilots can estimate position, distance, and angle of approach without looking at the tanker aircraft.

All external lights can be controlled from the cockpit with a toggle switch position ON-OFF, Bright-DIM selector and STD-FLASH control make it blinks or steady. Generally, when a plane fly below 5,000 feet the switch will be placed to the Bright/Flash position to make other planes or controller easy to see, as often we see everyday.

Categories and Tags Disappear in WordPress Self Hosted

There was time when the Categories and Tags on a WordPress-based blog that I manage myself (self hosted) disappeared. The front page blog displays “error 404 – Not found”, then when I logged into the administration page and click on “Writing – Edit” my posts are still there, just all the categories and tags that I have assigned to the article disappeared.

Other symptoms; when I added new categoriy and tag with the same name as the missing ones, there will appear a message that the category I added already exists and I can not add that particular category or tag, although it seems does not exist on the list.

The cause to the problem is very simple (although seems to be not related), do not worry this has nothing to do with your WordPress installation and you don’t need to reinstall WordPress or to restore the copy of database – something that I repeatedly do when it happens.

The problem is in the /tmp directory on the hosting server I use. It seems unrelated, but it’s the true cause.

The fix:

• If you have root access to the server, run the following command:
  df -h
  This command will display the status of free space on the server partition. Make sure / tmp 100% unused, and delete the files in it with this command:
  cd /tmp
  find . -exec rm {};
• Or if you have access to Cpanel, there is a link called “Service Status” on the sidebar (left bottom). Click it and check the /tmp partition. If it’s full, contact technical support of the webhosting service you are using, and ask them to empty /tmp.

I have proved this myself and indeed the problem is because the /tmp partition is full.

Oh yes, the last symptom I see was that the problem is intermittent. It can happend and disappear sometimes, this proves that it’s not a WordPress installation or database problem.

Good luck.

Source: WordPress> Support »Categories and tags dissappeared

Update: Not all web webhosting Cpanel based service opens the feature to show this status. However you can still ask them to check it out for you and to order the evacuation of /tmp partition.

PageRank Sculpting – Masihkah Berguna?

Google mengubah lagi “persepsinya” tentang atribut nofollow. Apakah perubahan ini berpengaruh terhadap situs anda? Mungkin, kalau sebelumnya anda memang menggunakan atribut nofollow ini untuk memanipulasi/sculpting PageRank situs anda.

Apa sih PageRank Sculpting ini? Read more…

Protected: Riset Pasar Dengan Google Insights – Final

Riset Pasar Dengan Google Insights – Bag.4

Artikel terakhir dari seri Riset Pasar Dengan Google Insights akhirnya kelar juga. Sesuai yang saya janjikan, artikel terakhir ini memuat cara-cara tentang menemukan niche yang sedang hot dan tersembunyi, dan bagaimana memanfaatkan Google Insights sebagai tool analisis sebelum anda berlanjut pada fase-fase lain dalam membangun bisnis online anda.

Bagaimana anda menggunakan Insights untuk analisa multi keywords, multi timeframe, dan multi locations.

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Saya kira subscribe gratis adalah tradeoff yang wajar, karena kalau saya membuatnya sebagai ebook dan dijual minimal $19 pun masih laku seperti sabun mandi (bosen kalo seperti kacang).

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Bagian-bagian sebelumnya bisa dibaca bebas disini, sini, dan disini.

Oh ya. Kalo males subscribe, dan merasa teknik-teknik yang saya berikan sulit dimengerti dan ingin belajar metode yang lebih sederhana dulu tapi mujarab, mungkin bisa menjalankan teknik-teknik yang diajarkan di sini. Cocok untuk bisnis apapun, bukan hanya online. Dijamin anda tidak akan pernah kehabisan ide.