Regulation Text
(a) Special flight restrictions. When any information indicates that barometric pressure on the route of flight currently exceeds or will exceed 31 inches of mercury, no person may operate an aircraft or initiate a flight contrary to the requirements established by the Administrator and published in a Notice to Airmen issued under this section.
(b) Waivers. The Administrator is authorized to waive any restriction issued under paragraph (a) of this section to permit emergency supply, transport, or medical services to be delivered to isolated communities, where the operation can be conducted with an acceptable level of safety.
[Amdt. 91-240, 59 FR 17452, Apr. 12, 1994; 59 FR 37669, July 25, 1994]
The short answer
(14 CFR § 91.144) When information indicates barometric pressure on the route currently exceeds or will exceed 31 inches of mercury, no person may operate an aircraft or initiate a flight contrary to requirements published in a NOTAM. The Administrator may waive the restriction for emergency supply, transport, or medical services to isolated communities.
Research Notes
Common Questions
At what barometric pressure does 91.144 apply?
It applies when barometric pressure on the route of flight currently exceeds or will exceed 31 inches of mercury.
“When any information indicates that barometric pressure on the route of flight currently exceeds or will exceed 31 inches of mercury, no person may operate an aircraft or initiate a flight contrary to the requirements established by the Administrator and published in a Notice to Airmen issued under this section.” — 14 CFR § 91.144(a)
Can the high-pressure restriction be waived?
Yes. The Administrator may waive the restriction to permit emergency supply, transport, or medical services to isolated communities when it can be done with an acceptable level of safety.
“The Administrator is authorized to waive any restriction issued under paragraph (a) of this section to permit emergency supply, transport, or medical services to be delivered to isolated communities, where the operation can be conducted with an acceptable level of safety.” — 14 CFR § 91.144(b)
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