Recently, netizens "fishtimes" at the Beijing airport when the aircraft shot, accidentally discovered outside door handle before boarding a flight of an aircraft into the groove not suspected boarding door is not closed.
Boarding door external handle into the groove of the case did not believe a lot of these crew have seen, sometimes in front of the plane slide, sometimes in the plane to Hong Kong, then the situation in the end have any effect on flight safety of it?
We all know that if the aircraft door is not closed to God is a very dangerous thing, ranging from a warning appears the door is not closed, resulting in return, the aircraft heavy pressure relief doors even open air, causing serious flight accidents.
But not into the external handle the boarding gate will happen if the slot above it?
In fact, from the boarding gate locking mechanism of the principle that as long as the closure in place inside the handle, the door warning light is off, even if no external handle into the slot, it will not happen over the situation, because the door is already shut itself better. At this point if external pull handle is free to rotate 360 degrees, it does not cause the door to open unexpectedly.
But this does not mean the boarding gate external handle into the groove is not normal, indicating that the door handle mechanism is problematic, it should say belong to malfunctions or defects. The reasons may be several, we combine the handle mechanism will be described in Fig. (To 737 as an example):
1, the external handle mechanism spline wear, no external drive handle fully in place after the internal handle in
2, the external cavity handle mechanism spring wear mechanism, the internal handle in place, do not drive external spline handles fully in
3, the external cavity handle mechanism spring spring tension, lack of will to pull the handle completely into the slot.
Then this will cause any harm to it? The only harm that should be on the front of the fuselage aerodynamic slightly affected, but will not affect flight safety.
External door handle in the slot revenues, should flush with the outside of the fuselage skin, if there are deviations, the handle may emerge groove in the external air stream, turbulence and so on. Route maintenance unit can close the door after carefully check whether the handle is flush with the skin from the outside, after the handle into the slot held in place with a spring force, and then pop up the possibility of very small, unless the institution itself, there is a big problem .
Inspection of aircraft before slipping out the door is very important, in addition to handle their own checks, also check the door mechanism itself is flush with the surrounding skin, including the upper and lower door hinge doors and hinged doors and fuselage skin between seal, have occurred in the lower part of the door hinge door is not fully in place and seal prolapse cause air pressure release events.
Maintenance inspection of stress "your eyes - to hand - heart to" the most important thing is heart to, as long as the heart, can be found on the plane defects and safety risks, risk exclusion from outside "door."
Although the external door handle into the groove did not affect the safety of the aircraft, you can safely take the passengers, but maintenance work is rigorous and meticulous standpoint, should ensure that the handle in the slot, because the unit closed doors, aircraft on the ground is not clearly the actual situation, if not in the tank, aircraft need to remind the crew to re-close the door. So, every time the aircraft before departure, maintenance brothers have intentions and ask yourself: aircraft doors closed yet?
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