View Full Version : Evolution of 737 Runaway Trim Procedure

12th May 2019, 16:45
FAA officials have told airline safety officials and pilots unions in April 2019 that they are reviewing the Runaway Stabilizer procedure in the wake of the 737 MAX MCAS accidents.
737 Runaway Stabilizer Procedure (http://www.b737.org.uk/runawaystab.htm) (Chris Brady)

Note changes; aircraft evolution, system complexity, aerodynamic effectiveness, switching - order / evaluation time, symptom definition. Human performance, training.
2013- current
and next …

‘Dennis Tajer of the Allied Pilots Association, which represents 15,000 pilots of American Airlines, has said of the FAA review: "I want them to be invasive. I want them to be aggressive. I want them to be obstinate about knowing all of the information, I want them to be more than trust but verify." He went on to say that even if the basic steps do not change, the spartan checklist language could be augmented with instructions such as those contained in Boeing supplemental materials: "It may take two pilots to manually trim the aircraft." "It may require elevator load alleviation in order to manually trim the aircraft." I have to say that I agree that more information in the QRH would be helpful.’

related - https://www.pprune.org/tech-log/619326-boeing-advice-aerodynamically-relieving-airloads-using-manual-stabilizer-trim.html

Also see https://www.pprune.org/rumours-news/621448-737-trim.html

13th May 2019, 14:03
Also see 737 Trim (https://www.pprune.org/rumours-news/621448-737-trim.html) ( now closed ???)

Revisit the Boeing advice on "aerodynamically relieving airloads" using manual stabilizer trim thread for new AvWk update - https://www.pprune.org/showpost.php?p=10470262&postcount=53 (https://www.pprune.org/showpost.php?p=10470262&postcount=53)

13th May 2019, 23:12
I am doing my sim early August and I will boil up some trim/stab scenario , as it is strangely quiet on the West Front.
Looks like everything is in major lock-down.
EASA was talking late summer last Tuesday.
If basic trim is up for review it will take time.
Interesting times,,,,