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What is runaway stabilizer trim?
While adding a motor to a trim system can provide important safety and convenience benefits, it can also introduce the potential for a malfunction called “runaway trim.” Runaway trim occurs when the Trimmable Horizontal Stabilizer (THS) or other trim device on the aircraft tail fails to stop at the desired position and …
What is the difference between b737 800 and b737 MAX 8?
The MAX 8 replaces the 737-800 with a longer fuselage than the MAX 7. The MAX 8 has a lower empty weight and higher maximum takeoff weight than the A320neo, making it a lot better than its main competitor. Hence MAX 8 was a successful fleet for the carriers and gaining reputations for its performance worldwide.
Is the MAX 8 safe now?
Is it safe now? By endorsement of the FAA, Boeing and its pilots, the 737 MAX has been determined as safe to fly. But safe pilots fly planes safely and part of being a safe pilot is being well-trained and well-informed as to the full functionality of an aircraft’s systems.
What are the checklist items for a runaway stabilizer?
Here is a screenshot of a B737 Max 8 Runaway Stabilizer Checklist. There might be some small variations in the checklist when comparing each individual airline. Additionally, here is the Boeing “Uncommanded Nose Down Stabilizer Trim” bulletin that was issued to all B737 Max 8 operators after the Lion Air crash. Highly active question.
Where are the stab trim switches on a 737 MAX?
Note that on the MAX, the MAIN ELEC and AUTO PILOT Stab trim switches now either switch will cut-off both main electric and autopilot stab trim. They are renamed PRI and B/U (primary and backup). The switches are guarded in the NORMAL position (switch up) and CUTOFF is switch down.
When did the FAA change the runaway stabilizer procedure?
Home > History and Variants > 737 Max > MAX Differences > MCAS > Runaway Stabilizer Procedure In November 2020, the FAA revised the Runaway Stabilizer procedure in the wake of the two 737 MAX MCAS accidents.
When to use manual trim on a stabilizer?
If manual stabilizer trim is necessary, ensure both stabilizer trim cutout switches are in CUTOUT prior to extending the manual trim wheel handles. Excessive airloads on the stabilizer may require effort by both pilots to correct the mis-trim. In extreme cases it may be necessary to aerodynamically relieve the airloads to allow manual trimming.