737 Max UPDATE 16 April 2021 Electrical Issues

it's friday april 16th my name's juan brown you're watching the blancolyrio channel with an almost live report from sunny hot flat and crowded lakeland florida sun and fun 2021 what a great turnout here at sun and fun this year quick 737 max update this has been out for a couple of days now and uh not widely understood uh small grounding of some of the 737 max aircraft but a recent article by dominic gates of the seattle times if there's one press a written press journalist out there that i would highly recommend subscribing to and following and that would be dominic gates of the seattle times is one of the few people that has access some access to the workings inside the boeing aircraft corporation and in a recent article he was able to shed a little light of what's going on with the 737 max and this recent grounding there was no air worthiness directive produced for this current grounding of the 737 aircraft it's a very short grounding you're going to get the aircraft fixed really quickly here there was no emergency airworthiness directive associated with with this either it's a problem with the with a emergency power supply it sounds like they're not saying exactly what component it is but here's what here's what dominic gates says and we can glean from this quite a bit of information the problem according to two people with knowledge of the modified manufacturing process arose when a backup electrical power control unit pcus they're often called was secured to a rack on the flight deck with fasteners in place of the rivets previously used so you got a pcu that's that's mounted on a rack up in the cockpit and normally these are riveted onto the rack and i don't know if this is an issue with the original type certificate versus the actual manufacturing process but instead of being riveted in it sounds like this rack was bolted in and as a result of it being bolted in instead of riveted there's concerns about the electrical grounding of the component each electrical component needs to be grounded electrically to the airframe for the circuit to work correctly and grounding problems can be provide a whole host of electrical gremlins or problems to your to your electrical system so this is a pcu that has been bolted in instead of riveted in so what they got to do is replace the bolts with rivets and put it back to its original configuration again this is highlighting a problem of the quality control process over there at boeing so it's only grounded a handful of aircraft and they're going to get these fixed quickly and get them returned to service the lack of secure electrical grounding could potentially cause malfunctions on a variety of electrical systems such as the engine anti-i system and the apu or auxiliary power unit that's really the only emergency backup that i know of oh boy you just animate the pattern stand by one the emergency backup power on the 737 is what the battery and or the apu so boeing notified the faa it wasn't the other way around on this situation and after boeing informed the airlines late thursday evening southwest grounded 30 of its maxes and american airlines grounded 17 of their max aircraft in united 16 of their max aircraft 16 other customers worldwide were affected by this now there was another issue previously unreported regarding the quality control issue with the electric stabilizer trim motors themselves in a recent batch here's let's go back again to uh seattle times in a recent batch of 20 to 40 of these electric motors which drive the jack screw on the horizontal stab trim of the 737 max and are produced by eaton manufacturing in ireland this defective motor it sounds like was only to be found in about seven max aircraft that are have already been built and those motors have been replaced so there have been no problems with these electric motors on the 737 max remember once the if you do have a problem with the electric trim motor itself on the 737 even on the max you can still manually trim the aircraft and i've had this happen before on a different airplane an md-80 or a dc-9 where the electric pitch trim failed we were on approach coming into land so we already had the aircraft pretty well configured for the approach and landing and in the case of the dc-9 the alternate trim or suitcase suitcase switches also did not work learning from alaska airlines disaster regarding the trim system on the dc-9 we elected not to fiddle with it follow the checklist and in that case went ahead and landed with the trim set in its last setting and it was just a little bit heavier on the elevator trim for the flare and landing no big deal but in the case of the 737 you can still manually trim the aircraft using the hand crank trim wheels if this system fails it is all associated to the mcas system but again if the motor itself fails the mcas system can't work now uh there was an incident here recently on march 29th of an american airlines flight from miami to santo domingo returned to miami with a pitched trim problem the pitch trim quit working in that case it was not found not to be the motor it was found to be the relay that turns the pitch trim motor on and off had failed and again that crew was able to run the correct checklist and was able to simply manually trim the aircraft and return to miami and land uneventfully so that's your 737 max update more teething problems on quality control over at boeing aircraft as they get these aircraft returned to service thanks for your support we'll see you here i gotta go look at some airplanes i'll show you a few here at the end you

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Length: 6min 49sec (409 seconds)

Published: Fri Apr 16 2021