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That knock-knock sound is the sound of a sonar pinger. you are looking at the shape you are looking at the shape that it makes on the screens. we've been talking about the black boxes and pingers and how they're activated almost from day one when they hit the water, we want to give you a demonstration with david soucie. and director of special projects is with us. former transportation general mary schiavo, and analyst and veteran pilot miles o'brien. david, you have the pinger, explain how it works. >> this is the pinger, it gets replaced on the c check.

To that. so the manufacturer says you need to store them in a dry room temperature, 70 degrees, 85 at the most. so they got rid of these pingers, they put all new pingers in the refrigerator while he was there. now he tells me after that, that that process is not being followed. he's seen countless times those pingers back in those rooms. >> the concern could be that a pinger would be put on board one of these planes without the full life. >> exactly. >> and there's no way to test the battery life of these devices before putting them on the aircraft? >> no, at the c-check, which is every thous...

That process is not being followed. he's seen countless times those pingers back in those rooms. >> the concern could be that a pinger would be put on board one of these planes without the full life. >> exactly. >> and there's no way to test the battery life of these devices before putting them on the aircraft? >> no, at the c-check, which is every thousand hours, they do check them to see if it pings. which it would. but there's no way to test like put a load on it, like you would test your car battery. so i'm concerned that if these others were at half life, if one of those bad ones were put...

Detect cracks. how often are those done? >> they are what is call the a inspection, b check, c check and d check. the b check is the one they break up the plane completely apart and as if they are building a new aircraft they replace the skin and everything. prior to those checks, which are done between every four to five years there are also what is call the c check and the airliners are mandated by the faa to do so every three months approximately or so. i'm sorry, every 12 to a teen months. during those checks they inspect the wing structure and the cracks on the aircraft, if there are any....

Detect cracks. how often are those done? >> they are what is call the a inspection, b check, c check and d check. the b check is the one they break up the plane completely apart and as if they are building a new aircraft they replace the skin and everything. prior to those checks, which are done between every four to five years there are also what is call the c check and the airliners are mandated by the faa to do so every three months approximately or so. i'm sorry, every 12 to a teen months. during those checks they inspect the wing structure and the cracks on the aircraft, if there are any....