91.144 TFR for High Pressure

[juxtapilot]

91.144 states that if barometric pressure will exceed 31 inhg along the route of flight you may not operate an aircraft there. Does anyone know what the reason for this regulation is? Isn't a higher pressure a good thing? How does the abnormally high pressure affect flight negatively?

 

[SpiceWeasel]

91.144 states that if barometric pressure will exceed 31 inhg along the route of flight you may not operate an aircraft there. Does anyone know what the reason for this regulation is? Isn't a higher pressure a good thing? How does the abnormally high pressure affect flight negatively?

Have you looked at instrument certification requirements? This could be because most altimeters can't be set beyond 31".....

heh heh I'm leaving my retarded-ness up here so I don't look like I'm changing my tune, but I looked it up and got this:

http://www.aviationchatter.com/2009/01/under-pressure-far-part-91144/


"In English, if the altimeter is near 31.00, the normal rules for setting the altimeter might not apply. It is the responsibility of the pilot in command to check the NOTAMs and comply with the special rules implemented for this weather condition. In fact, you can not legally fly unless you have complied with the NOTAM."

If there's a NOTAM about it, you comply with it.... I'm going to assume that the NOTAM probably tells you to set a standard altimeter setting (29.92)

 

[juxtapilot]

Have you looked at instrument certification requirements? This could be because most altimeters can't be set beyond 31".....

heh heh I'm leaving my retarded-ness up here so I don't look like I'm changing my tune, but I looked it up and got this:

http://www.aviationchatter.com/2009/01/under-pressure-far-part-91144/


"In English, if the altimeter is near 31.00, the normal rules for setting the altimeter might not apply. It is the responsibility of the pilot in command to check the NOTAMs and comply with the special rules implemented for this weather condition. In fact, you can not legally fly unless you have complied with the NOTAM."

If there's a NOTAM about it, you comply with it.... I'm going to assume that the NOTAM probably tells you to set a standard altimeter setting (29.92)

Yea I thought about this, but what if you have an abnormally LOW pressure? Like in a hurricane a pressure could be as low or maybe even lower than 24" hg...

Granted you probably aren't flying through a hurricane, but where is the reg for that?

 

[SpiceWeasel]

Yea I thought about this, but what if you have an abnormally LOW pressure? Like in a hurricane a pressure could be as low or maybe even lower than 24" hg...

Granted you probably aren't flying through a hurricane, but where is the reg for that?

Maybe the Tombstone Aviation Agency hasn't thought of that.... after all, this rule seemingly came about due to an abnormally high pressure in Alaska in 1989....