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Search: Posts Made By: Tomaski
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Forum: Tech Log
15th Oct 2019, 11:28
Replies: 14
Views: 722
Posted By Tomaski

And yet I have actually seen this difference in...

And yet I have actually seen this difference in the Engine Out Acceleration Altitude (EOAA) happen when comparing the takeoff data for full length vs intersection during preflight, so something...
Forum: Tech Log
15th Oct 2019, 00:20
Replies: 14
Views: 722
Posted By Tomaski

There actually is an odd case in which the...

There actually is an odd case in which the performance numbers might change - obstacle clearance height. The area that is surveyed for obstacles extends out in a narrow cone. When this cone is moved...
Forum: Tech Log
14th Oct 2019, 17:15
Replies: 11
Views: 1,184
Posted By Tomaski

I never said it was a good reason, but I can see...

I never said it was a good reason, but I can see the thought process that gets you there.
Forum: Tech Log
14th Oct 2019, 13:39
Replies: 11
Views: 1,184
Posted By Tomaski

If someone is actually putting the master switch...

If someone is actually putting the master switch on without the APU running, then I'm guessing they want to get a leg up on a possible APU start after takeoff (engine failure, generator drops off...
Forum: Tech Log
14th Oct 2019, 13:31
Replies: 13
Views: 1,657
Posted By Tomaski

Well, we really weren't specifically talking...

Well, we really weren't specifically talking about MCAS. It is impossible to put flight crews through every possible combination of, again, realistic scenarios that would involve managing multiple...
14th Oct 2019, 13:20
Replies: 3,092
Views: 2,694,825
Posted By Tomaski

That is certainly one possibility. The other, of...

That is certainly one possibility. The other, of course, is that there was pressure on both flight crews and technicians to keep the metal moving. It was an unusual choice for the penultimate Lion...
14th Oct 2019, 12:28
Replies: 60
Views: 32,672
Posted By Tomaski

Boeing considered MCAS to be a subset of the...

Boeing considered MCAS to be a subset of the Speed Trim System, thus it's functionality would be tied to the availability of the STS. In the original design (and similar to the 737NG today), STS was...
Forum: Tech Log
14th Oct 2019, 12:07
Replies: 13
Views: 1,657
Posted By Tomaski

There is a difference between presenting multiple...

There is a difference between presenting multiple unrelated non-normals (as the thread title suggests) and a scenario in which multiple NNC must be prioritized and managed. While the former may be...
Forum: Tech Log
14th Oct 2019, 12:04
Replies: 11
Views: 1,184
Posted By Tomaski

Unless the APU is still running from the before...

Unless the APU is still running from the before taxi/engine start phase. In that case, the ram air door will have cycled closed. Having the master switch on without the APU running will cause the ram...
Forum: Tech Log
12th Oct 2019, 12:20
Replies: 9
Views: 1,584
Posted By Tomaski

My FCOM does not give specific numbers. It states...

My FCOM does not give specific numbers. It states that the the first detent is idle reverse and the second detent provides "adequate reverse thrust for normal operations." The second detent is NOT...
Forum: Tech Log
12th Oct 2019, 11:52
Replies: 31
Views: 2,833
Posted By Tomaski

IMHO, two of the primary reasons that 737 pilots...

IMHO, two of the primary reasons that 737 pilots have so many questions/concerns about the Airspeed Unreliable NNC in the takeoff phase is 1) lack of detailed guidance from Boeing and 2) lack of...
11th Oct 2019, 21:30
Replies: 3,092
Views: 2,694,825
Posted By Tomaski

While that was how the test failure was initially...

While that was how the test failure was initially reported, later reporting refuted this particular detail. A subsequent article discussed how an intentionally induced fault (caused by "flipping...
11th Oct 2019, 16:44
Replies: 3,092
Views: 2,694,825
Posted By Tomaski

Because the current procedure actually delays the...

Because the current procedure actually delays the crew response to an actual runaway stab trim. I believe this may have been one of the issues in the E-CAB test failure in which the FAA determined...
Forum: Tech Log
11th Oct 2019, 16:40
Replies: 31
Views: 2,833
Posted By Tomaski

On the 737NG and later, pitot-static and AOA...

On the 737NG and later, pitot-static and AOA inputs are processed through independent (left & right) Air Data Inertial Reference Units (ADIRU's) to generate a computed airspeed (CAS) which is...
Forum: Tech Log
11th Oct 2019, 16:03
Replies: 31
Views: 2,833
Posted By Tomaski

Yes. A faulty airspeed or AOA input will cause...

Yes. A faulty airspeed or AOA input will cause the bad side Stall Management Yaw Damper (SMYD) computer to generate a stall signal. This stall signal will then initiate four system responses:

Bad...
Forum: Tech Log
11th Oct 2019, 12:52
Replies: 31
Views: 2,833
Posted By Tomaski

A significant challenge for creating this NNC is...

A significant challenge for creating this NNC is to come up with "memory item" pitch and power settings that work for all aircraft and all flight regimes. Presumably, MCT and 15 degrees does not work...
10th Oct 2019, 22:12
Replies: 244
Views: 223,694
Posted By Tomaski

It would be interesting to compare crack...

It would be interesting to compare crack incidence with type of winglet and how many cycles since they've been installed. Some of these aircraft may have accumulated a lot of their cycles prior to...
10th Oct 2019, 18:01
Replies: 3,092
Views: 2,694,825
Posted By Tomaski

Speed Trim failure is not new and has an...

Speed Trim failure is not new and has an associated annunciator on the overhead panel. Loss of Speed Trim is not a serious issue.
Stab Out of Trim is an annunciated malfunction that occurs when...
10th Oct 2019, 13:07
Replies: 3,092
Views: 2,694,825
Posted By Tomaski

Update on return to service by Jon Ostrower: link...

Update on return to service by Jon Ostrower: link (https://theaircurrent.com/aviation-safety/checklists-come-into-focus-as-pace-setter-for-737-max-return/)
Forum: Tech Log
10th Oct 2019, 02:16
Replies: 31
Views: 2,833
Posted By Tomaski

It depends on how soon before V1. At my...

It depends on how soon before V1.

At my airline, we procedurally do an airspeed crosscheck at 80 KIAS, and if they agree we continue. From that point we are in the "high speed" regime and -...
Forum: Tech Log
9th Oct 2019, 14:41
Replies: 3
Views: 555
Posted By Tomaski

Nearest altitude works as high precision is not...

Nearest altitude works as high precision is not necessary for the system to work properly. Since there can be substantial elevation differences across a particular airfield, the published field...
9th Oct 2019, 14:31
Replies: 244
Views: 223,694
Posted By Tomaski

This Leeham News piece provides a good update:...

This Leeham News piece provides a good update: link to article (https://leehamnews.com/2019/09/30/boeings-737-in-another-pickle/)
Forum: Tech Log
8th Oct 2019, 20:37
Replies: 31
Views: 2,833
Posted By Tomaski

I tend to agree with you, but Boeing’s guidance...

I tend to agree with you, but Boeing’s guidance seems to suggest sooner. There is no good reason to do anything with the thrust setting until at least 400 AFE. See what your instructor has to say.
Forum: Tech Log
8th Oct 2019, 15:58
Replies: 31
Views: 2,833
Posted By Tomaski

Great reference, but not all airlines use the...

Great reference, but not all airlines use the generic Boeing FCTM. My airline has a tailored manual that does not provide these bullet notes on the Airspeed Unreliable NNC. I’m curious if either...
7th Oct 2019, 12:13
Replies: 3,092
Views: 2,694,825
Posted By Tomaski

All true, but at the same time the spotlight...

All true, but at the same time the spotlight being placed on MCAS shouldn't blind us to some of the other concerns that these accidents have raised.
Showing results 1 to 25 of 151
 


 
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