Narrative:

This is a follow up to a previous report for a pitot static event. The safety team has closed out its report and the investigation is complete; but inconclusive; which is very disturbing given the severity of the incident. I am not satisfied by the results of the investigation as I believe that the maintenance resolution in the logbook indicated that the technicians who originally looked at the aircraft said that the captain's probe was not getting heat. Further investigation indicated that the aircraft itself was delivering power to the probe and that replacing the probe resolved the problem. As I understand; the manufacturer bench tested the probe in question and it worked fine. My concern is that there could be a partial probe heating issue similar to what (other carrier) was experiencing with their ng's back in 2015. In addition; (a company publication) detailed an incident similar to mine and the results of that investigation have not been correlated relative to all these other reports of probe heating abnormalities. It's important for our pilots to know if the two events have anything in common. Also; I've not yet seen a summary of my event in any literature from the company that would serve to warn pilots of this possible anomaly which is a severe safety issue with potential to result in loss of aircraft and life.prevention:1. Publish the details of my incident in the (company publication) to warn pilots.2. Make absolutely sure that the company installs the angle of attack calligraphic information on both pfds and the HUD when we go to the dual cue flight director. Train to use aoa (angle of attack) and fpv (flight path vector) in case the pitot static is unreliable.3. Change airspeed unreliable checklist to pitot static unreliable and update procedure to include reference to flight path marker for pitch and aoa indications for airspeed.4. Get boeing to release a detailed summary of all 737-ng pitot static/probe heat/adiru (air data inertial reference unit) abnormalities that it is aware of from all sources; operators and time frames to see if any commonalities can be identified.

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Original NASA ASRS Text

Title: B737-NG Captain reported a pitot-static event where the Captain's probe tip was not getting any heat.

Narrative: This is a follow up to a previous report for a pitot static event. The Safety Team has closed out its report and the investigation is complete; but inconclusive; which is very disturbing given the severity of the incident. I am not satisfied by the results of the investigation as I believe that the Maintenance resolution in the logbook indicated that the technicians who originally looked at the aircraft said that the Captain's probe was not getting heat. Further investigation indicated that the aircraft itself was delivering power to the probe and that replacing the probe resolved the problem. As I understand; the manufacturer bench tested the probe in question and it worked fine. My concern is that there could be a partial probe heating issue similar to what (other carrier) was experiencing with their NG's back in 2015. In addition; (a Company publication) detailed an incident similar to mine and the results of that investigation have not been correlated relative to all these other reports of probe heating abnormalities. It's important for our pilots to know if the two events have anything in common. Also; I've not yet seen a summary of my event in any literature from the Company that would serve to warn pilots of this possible anomaly which is a severe safety issue with potential to result in loss of aircraft and life.Prevention:1. Publish the details of my incident in the (Company Publication) to warn pilots.2. Make absolutely sure that the Company installs the angle of attack calligraphic information on both PFDs and the HUD when we go to the dual cue flight director. Train to use AOA (Angle of Attack) and FPV (Flight Path Vector) in case the pitot static is unreliable.3. Change airspeed unreliable checklist to pitot static unreliable and update procedure to include reference to flight path marker for pitch and AOA indications for airspeed.4. Get Boeing to release a detailed summary of all 737-NG pitot static/probe heat/ADIRU (Air Data Inertial Reference Unit) abnormalities that it is aware of from all sources; operators and time frames to see if any commonalities can be identified.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.