PRE FLIGHT CHECK

In aviation, a preflight checklist is a list of tasks that should be performed by TMA or pilots before takeoff. Its purpose is to improve flight safety by ensuring that no important tasks or damages are forgotten.  

Failure in preflight check  is a major contributing factor for aircraft accidents.

The pre flight check consists of doing a walk arround the airplane, starting from the forward left access door of the plane, following the next itinerary in clockwise direction:

Nose


Inspect and check nose for any damage or scratch,



















 Inspect the nose gear to ensure that is not any pinlock forgotten and sensors located on the gear, inspect nose gear lights. Check that antenas, pitot and static ports are not covered.










Forward fuselage and wings.
Inspect ram air doors on the fuselage. Check lights on the leading edge of de wing, check the engine inlet is clear,

 inspect strobe and navigation lights on the tip of the wing, search for any scratches on the wings. And static dischargers are not damaged.



After Fuselage.
Check main landing gear for any hydraulic leaks and bottle extinghuisher. Check doors and panels are closed.

 Check APU air inlet is clear, make sure that dorsal fin and horizontal stabilizer are in good condition. Make sure drainings are not obstructed or covered.

TURBOCOMMANDER HYDRAULIC RESERVOIR DISASSEMBLY

In this task we have to disassembly and assembly the Turbocommander 680V Hydraulic Reservoir.

First of all, we have to go to the Turbocommander's AMM, to the hydraulic section and follow the disassembly instructions, warnings and cautions.

Hydraulic Reservoir Disassembly:

Prepare the Cockpit, cut Hydraulic Reservoir circuit breaker, use adecuate EPIS for the task.

A-Install the tail stand

B-Drain Hydraulic Reservoir

C-Disconnect all lines from Reservoir and line ports.

D-Remove attaching bolts from frame structure to Reservoir.

E-Carefully remove Reservoir.

Hydraulic Reservoir Assembly

Reverse Removal Procedure:

A-Attach attaching bolts from frame structure to Reservoir

B-Connect all lines to Reservoir and line ports.

C-Remove the tail stand.

D-Fill Reservoir and do a check of the system. 

What were the different causes of the accident? 

In this accident like most of the accidents of aiplanes, there is not an specific cause, there are different and small human errors that when you join it together it becomes on a big problem.

The major cause of this accident is the wheather.

Wheather conditions were very bad, almost the worse conditions for aircrafts, ice is formed because of the low temperatures, the principal cause of the crash was the ice.

We can consider different causes of the accident.

The first cause is the de-icing liquid, it were not in the optimal mix required for the manufacturer, this error caused that the wings became frozen before the takeoff.

The second cause was an accumulation of ice in the thrust sensors located on the engine caused by the pilots, they forgot to activate the engine anti-ice system, and this caused a bad reading of the thrust parameters and to take off with less power.

The third cause was the poor experience of the captain and first officer in winter conditions, for this reason they did not do the checklist propperly and forgot to activate de-icing systems, and the use of reverse thrust when its forbiden.

 What other crashes were caused by maintenance errors?

Alaska Airlines Flight 261 was a international passenger flight on January 31.

 The aircraft, a MD-83, crashed into the Pacific ocean after suffering a catastrophic loss of pitch control. The crash killed everyone aboard: two pilots, three cabin crewmembers, and 83 passengers.

The investigation determined that inadequate maintenance cause eventual failure of a critical control system during flight. The probable cause was stated to be "a loss of airplane pitch control resulting from the in-flight failure of the horizontal stabilizer trim system jackscrew assembly's. The thread failure was caused by excessive wear resulting from the maintenance insufficient lubrication of the jackscrew assembly.

Why am I studying aviation maintenance?

Since I was a child I always want to be a mechanic I was allways fixing things of my bicycle, and motorbike.
Also because I love motorsport and I've always wanted to touch it by my hands.
When I was doing baccalaureate a friend of mine told me that his cousin was an airplane mechanic. I've never heard about aviation maintenance before, so I decided to investigate about it.
I realized that de course is done in te same school that I was going, Son Pacs.

I found it very interesting because of the complexity of an aircraft, there is a massive amount of components and systems in a plane.

After asking some details of the course, I made the decision of doing aviation maintenance and now that I know more about it I'm sure that it was the correct decision.

In the future I want to become an experienced TMA and travel to different counties to work as a mechanic, learning more things everyday about airplanes and the world of aviation.

AIRBUS A380 VIDEO:

There are some things that I found interesting and surprising in this video.

First thing that surprises me is that the airplane is not constructed in one place, it is constructed in the countries that form Airbus company, each country constructs a part of the airplane, and then is assembled in the massive factory located in France.

Another fact that surprises me is the importance of the wing tips, and the fact that it can flip upside down the following plane, this is for the vortex created by the wings.

One of the elements that proves that A380 is the most massive airplane is the horizontal stabilizer, is as big as the wings of a small comercial aircraft, this is because horizontal stabilizer is one of the most important elements of the plane, and because of the dimensions of the plane, it has to be that big.

And for last, refered to the costs is that the RR engines of the A380 costs 36 million pounds and A380 has 4 of it, every fan blade costs aproximately as a luxury car. And RR company destroys an entire engine for proofing safety in case of fan blade destruction spending millions of pounds in name of safety.

To conclude, A 380 is the most amazing expensive and massive airplane ever made ind it will be difficult to beat.

what i have learned this week

Past week in Globalia we were doing Module 11 ATA 29 Air Conditioning System.
In this week we have learned a lot of things related with ventilation and pressurization, one of the things that i found more interesting is how do we get the air for air conditioning.
There are two types of aircrafts, the ones that are not pressurized and the ones that are pressurized.

 Non pressurized

















Pressurized


In a not pressurized aircraft we get the air conditioning air from ram air and its heated with exhaust gases from engines, nevertheless in a pressurized aircraft we do the opposite, we get the air from the compressors, but it has a disadvantage, the air from compressors is to hot, so we have to cool it down by mixing it with ram air, so we can get the optimum temperature.

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