Under what condition does a super-pressure balloon stop maintaining a constant level?

It stops maintaining a constant level when too much gas diffuses out of it.

GM1 to Appendix 2(3.3b)) OPERATING LIMITATIONS AND EQUIPMENT REQUIREMENTS

Q: Why do super-pressure balloons not require flight termination devices according to the EASA guidance?

Because they quickly rise after payload discharge and burst without the need for a device or system designed to puncture the balloon envelope.

Q: What is the definition of a super-pressure balloon in the context of operating limitations and equipment requirements?

A super-pressure balloon is a simple non-extensible envelope capable of withstanding a differential of pressure, higher inside than out, inflated so that the smaller night-time pressure of the gas still fully extends the envelope.

Q: How does a super-pressure balloon maintain a constant level during flight?

It will keep essentially constant level until too much gas diffuses out of it.

Q: What happens to a super-pressure balloon after payload discharge?

It quickly rises and bursts without the need for a device or system designed to puncture the balloon envelope.

Q: What is the key characteristic of a super-pressure balloon's envelope that allows it to avoid a flight termination device?

The envelope is simple and non-extensible, capable of withstanding a differential of pressure higher inside than out, and it bursts naturally after payload discharge.

Q: What is the purpose of inflating a super-pressure balloon so that the smaller night-time pressure of the gas still fully extends the envelope?

This inflation ensures the balloon will keep essentially constant level until too much gas diffuses out of it.

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GM1 to Appendix 2(3.3b)) OPERATING LIMITATIONS AND EQUIPMENT REQUIREMENTS

ED Decision 2013/013/R

SUPER-PRESSURE BALLOONS

Super-pressure balloons do not require flight termination devices as they quickly rise after payload discharge and burst without the need for a device or system designed to puncture the balloon envelope. In this context a super-pressure balloon is a simple non-extensible envelope capable of withstanding a differential of pressure, higher inside than out. It is inflated so that the smaller night-time pressure of the gas still fully extends the envelope. Such a super-pressure balloon will keep essentially constant level until too much gas diffuses out of it.

Details

Source-Title: GM1 to Appendix 2(3.3b)) OPERATING LIMITATIONS AND EQUIPMENT REQUIREMENTS View latest amendments

Erulesid: ERULES-1963177438-9809 Compare versions

Domain: Air traffic management/Air navigation services

Activitytype: Air navigation services (ANS), Air traffic control services (ATC), Air traffic services (ATS), Flight information services (FIS), Meteorological services (MET)

Applicabilitydate: 17 July, 2013

Entryintoforcedate: 17 July, 2013

Icaoreference: Annex 2

Regulatedentity: Member State, Unmanned free balloon operator, Competent authority, Air navigation service provider, Air traffic services unit

Regulatorysource: ED Decision 2013/013/R Navigate

Regulatorysubject: Annex-Section 3: General rules and collision avoidance

Typeofcontent: GM to IR (Guidance material to implementing rule)

Origin: EASA

Category: EAR