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Forum: Tech Log

14th Mar 2019, 16:05

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

No aircraft is perfect. They are a collection of...

No aircraft is perfect. They are a collection of engineering compromises.
Really know your aircraft, including all its warts and kluges!
Beg borrow or steal as much stick time as you can.
Know the...

Forum: Tech Log

2nd Jan 2019, 02:28

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

Conso, either find a picture of the nose of a...

Conso, either find a picture of the nose of a NG/MAX 737 and count the screw holes or go to the airport and make your own picture. I doubt if it has more than 6.
They can limit the...

Forum: Tech Log

2nd Jan 2019, 02:10

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

Wiedehopf, we are badly handicapped by not having...

Wiedehopf, we are badly handicapped by not having access to schematics of the SMYD box, its associated systems, and the Interactive Fault Isolation Manual to help better understand the maintenance...

Forum: Tech Log

1st Jan 2019, 21:04

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

Wiedehopf, I gather that you have not had to...

Wiedehopf, I gather that you have not had to troubleshoot intermittent electrical problems before-fair enough.
Consider an out of balance AOA sensor as a potential cause. This would create a...

Forum: Tech Log

31st Dec 2018, 06:00

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

Maintenance Decryption-Part 1

On October 26th on a flight from Tianjin Binhai China to Manado Indonesia, the Captains PFD had speed and altitude flags which caused speed and altitude not to be displayed and caused the maintenance...

Forum: Tech Log

30th Dec 2018, 02:57

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

Thank you weidehopf for pointing out the earlier...

Thank you weidehopf for pointing out the earlier flight maintenance history. It points out an area for investigation.

IMO the AOA maintenance had nothing to do with the stick shaker problem, but...

Forum: Tech Log

27th Dec 2018, 22:53

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

Gums, Just thinking like a systems engineer,...

Gums,
Just thinking like a systems engineer, without concrete knowledge of the 738 systems, but I think you will find that the AOA data is digitized inside the SMYD box and sent through a data bus...

Forum: Tech Log

27th Dec 2018, 19:38

Replies: 146

Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash

Views: 70,540

Posted By Machinbird

Smoking Gun?

Peter Lemme's Blog on the JT610 accident contains a lot of good information on the 737NG AOA systems which I am going to draw on. AOA Failure Modes...

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