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Forum: Tech Log

12th Oct 2019, 11:52

Replies: 43

B737 Airspeed Unreliable?

Views: 13,171

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...

Forum: Tech Log

11th Oct 2019, 16:40

Replies: 43

B737 Airspeed Unreliable?

Views: 13,171

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: 43

B737 Airspeed Unreliable?

Views: 13,171

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: 43

B737 Airspeed Unreliable?

Views: 13,171

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...

Forum: Tech Log

10th Oct 2019, 02:16

Replies: 43

B737 Airspeed Unreliable?

Views: 13,171

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

8th Oct 2019, 20:37

Replies: 43

B737 Airspeed Unreliable?

Views: 13,171

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: 43

B737 Airspeed Unreliable?

Views: 13,171

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...

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