Part 131 (Balloons and Hot Air Airships) Manual of Standards 2024made under theCivil Aviation Safety Regulations 1998 and the Acts Interpretation Act 1901Compilation No. 2Compilation date: 9 July 2026Includes amendments: F2026L00924Prepared by the Legal Services Branch, Legal Division, Civil Aviation Safety Authority, Canberra.ContentsNote This Table of Contents is for guidance only. It is not a formal part of the Part 131 (Balloons and Hot Air Airships) Manual of Standards 2024. See subsection 1.03.
(1) Subject to subsection 1.06 (5), in this instrument words and phrases have the same meaning as in the CASR Dictionary, Part 131 of CASR or the Act, unless a contrary intention appears.(2) In this MOS, a reference to a class of airspace means the volumes of airspace of that class, as determined by CASA in or under the Determination of Airspace and Controlled Aerodromes, Etc. (Designated Airspace Handbook) Instrument, as in force from time to time.Note The Determination of Airspace and Controlled Aerodromes, Etc. (Designated Airspace Handbook) Instrument is a legislative instrument that is revised and reissued by CASA approximately every 6 months. Airspace details from the Determination in force at any particular time are also published by Airservices Australia in the Designated Airspace Handbook available free online at www.airservicesaustralia.com.(3) In this MOS, any reference to a balloon being tethered is a reference to a balloon being tethered in a manner that conforms to the requirements of the AFM for the balloon.(4) In this MOS, unless a contrary intention appears:(a) mention of a provision with the prefix “131.” is a reference to that provision in Part 131 of CASR; and(b) mention of a provision with the prefix “91.” is a reference to that provision in Part 91 of CASR.(5) In this MOS:Note The following definitions are particularly useful for this MOS. Other relevant words and phrases not included below may have been defined in the CASR Dictionary.Act means the Civil Aviation Act 1988.adult has the meaning given by the CASR Dictionary.Note Adult means a person who has turned 13.aerodrome has the meaning given by the Act.AFM (short for aircraft flight manual) means the flight manual for a Part 131 aircraft.Note Flight manual is defined in the CASR Dictionary. It includes AFM supplements that may be supplied by the original aircraft manufacturer, or by another person, in accordance with Subpart 21.M of CASR.AGL means above ground level.AIP has the meaning given by the CASR Dictionary.Note The AIP is available through www.airservicesaustralia.com.AIP-ERSA means Aeronautical Information Publication — En Route Supplement of Australia.air traffic service has the meaning given by the CASR Dictionary.Note The phrase air traffic service includes 1 or more of the following: a flight information service, an alerting service, an air traffic advisory service, an ATC service, an area control service, an approach control service or an aerodrome control service. Air Traffic Services has a different meaning: see under ATS.AMSL means above mean sea level.ASAO is short for approved self-administering organisation, and has the meaning given by the CASR Dictionary.Note See also Part 149 of CASR.ATC means air traffic control.ATS has the meaning given to Air Traffic Services in the CASR Dictionary.authorised aeronautical information: see the CASR Dictionary.authorised weather forecast has the meaning given by the CASR Dictionary.authorised weather report has the meaning given by the CASR Dictionary.ballast means fine sand carried by a gas balloon to facilitate altitude control through the release of the ballast.balloon has the meaning given by the CASR Dictionary.balloon class endorsement has the same meaning as in Part 5 of CAR.balloon flying training means any training given to a person during flight time in a balloon for the purpose of increasing the person’s skill in flying the balloon, including balloon flying training:(a) for a prescribed purpose under paragraph 206 (a) of CAR, conducted in accordance with Part 5 of CAR; or(b) that is a Part 131 recreational activity.balloon recreational activity has the same meaning as in Part 131 of CASR.balloon transport operation has the same meaning as in Part 131 of CASR.balloon transport operator has the same meaning as in Part 131 of CASR.CAO means Civil Aviation Order.CAR means the Civil Aviation Regulations 1988.CAR certificate of validation has the meaning given by the CASR Dictionary.CASR means the Civil Aviation Safety Regulations 1998.CASR Dictionary means the Dictionary under regulation 1.004 of CASR.child has the meaning given by the CASR Dictionary.Note Child means a person who has turned 2 but has not turned 13.civil aviation legislation has the meaning given by section 3 of the Civil Aviation Act 1988.class, for a balloon, has the same meaning as in Part 5 of CAR.control area has the meaning given by the CASR Dictionary.controlled aerodrome has the meaning given by the CASR Dictionary.control zone has the meaning given by the CASR Dictionary.Note Controlled aerodromes, control areas and control zones are determined by CASA under the Airspace Regulations 2007.cost-sharing, for this MOS only, has the same meaning as in the CASR Dictionary but as if paragraph (a) stated: “(a) the flight is conducted using a Part 131 aircraft and does not carry more than 6 persons; and”.Note See also section 25.03.crown, for a Part 131 aircraft, means the highest point of the aircraft AGL when its envelope is fully inflated.CTA is short for control area.CTAF means common traffic advisory frequency, being a designated frequency on which pilots make positional broadcasts when operating in the vicinity of a non-controlled aerodrome.CTR is short for control zone.EASA is short for European Union Aviation Safety Agency, and has the meaning given by the CASR Dictionary.ETSO means a Technical Standard Order of EASA: see the CASR Dictionary.(E)TSO, followed by an identifying letter and number, is a shorthand reference to both the TSO and the ETSO, each of which has the same identifying letter and number.exposition has the meaning given by the CASR Dictionary.Note A provision of this MOS that prescribes exposition content is empowered by paragraph 131.195 (1) (n) of CASR as matter required to be included in the exposition under the regulations because the expression under the regulations is taken to include under the MOS: see Seaview Lord Howe Pty Ltd and Civil Aviation Authority (1995) 38 ALD 422; 21 AAR 506.FAA means the Federal Aviation Administration of the United States.final reserve fuel means the amount of usable fuel, expressed as a period of time, required to be remaining in the fuel tanks on completion of the final landing of a flight before ground handling.FL, or flight level, has the meaning given by the CASR Dictionary.flight note has the same meaning as in Chapter 13 of this MOS.flying in-company means that:(a) a group of at least 2 aircraft occupy a specific 3-dimensional volume of airspace; and(b) the aircraft within the group self-separate from each other while within that volume of airspace.flying in formation has the meaning given by the CASR Dictionary.forecast QNH means QNH obtained from an authorised weather forecast.ft means feet.gas balloon has the meaning given by the CASR Dictionary.GNSS means the global navigation satellite system.ground support personnel means 1 or more persons assigned by the operator of a Part 131 aircraft to perform duties on the ground related to the operation of the aircraft at any time during initial set up, inflation, take-off, flight, retrieval, landing and pack up.Note 1 For example, a balloon transport operator may assign a ground support person for any duty specifically concerned with the safety of the passengers from arrival at the launch area to final departure from the landing area.Note 2 See also operational safety-critical personnel.hot air airship has the meaning given by the CASR dictionary.hot air balloon means a manned free balloon that derives its lift from heated air.hPa means hectopascals.in-company, in relation to 2 or more Part 131 aircraft in flight, means such aircraft:(a) that form a group and occupy a specific 3-dimensional volume of airspace; and(b) each of whose pilots in command self-separates from the other group aircraft in the volume of airspace.infant has the meaning given by the CASR Dictionary.Note Infant means a person who has not turned 2 years of age.inoperative, for anything, has the meaning given by the CASR Dictionary.in the vicinity of a non-controlled aerodrome has the meaning given by the CASR Dictionary.JRCC means the Joint Rescue Coordination Centre of the Australian Maritime Safety Authority.km means kilometres.kts means knots.light sport balloon has the meaning given by the CASR Dictionary.lighter-than-air aircraft has the meaning given by the CASR Dictionary.m, for a distance, means metres.manned free balloon has the meaning given by the CASR Dictionary.MBA means mandatory broadcast area.MEL (short for minimum equipment list) has the meaning given by the CASR Dictionary.mixed balloon means a manned free balloon that derives its lift from a combination of heated air and non-flammable lighter than air gas.MOS means Manual of Standards.MTOW, or maximum take-off weight, has the meaning given by the CASR Dictionary.NAA, or national aviation authority, has the meaning given by the CASR Dictionary.NM means nautical miles.NOTAM has the meaning given by the CASR Dictionary.operational safety-critical personnel has the meaning given by the CASR Dictionary.operative, for anything, means that the thing is not inoperative.operator has the meaning given by the CASR Dictionary.Part 131 aircraft has the meaning given by regulation 131.005 of CASR.Part 131 ASAO has the meaning given by the CASR Dictionary.Part 131 pilot authorisation has the meaning given by the CASR Dictionary.Part 131 recreational activity has the meaning given by the CASR Dictionary.public gathering has the meaning given by the CASR Dictionary.QNH is an atmospheric pressure adjusted to sea level and measured in hPa or millibars so that when QNH is set the altimeter will read altitude.quick-donning mask means an oxygen mask that:(a) is for a flight crew member’s personal use; and(b) within 5 seconds of it being deployed and ready for use, the flight crew member can, with 1 hand, place over the face, secure and seal.recognised country: see the CASR Dictionary.Note Recognised countries include the following:(a) Canada;(b) France;(c) Germany;(d) Netherlands;(e) New Zealand;(f) United Kingdom;(g) United States of America.relevant endorsement has the meaning given by Civil Aviation Order 95.54 (Part 131 Recreational Activity and Specialised Balloon Operations) Instrument 2024.relevant permit to operate has the meaning given by Civil Aviation Order 95.54 (Part 131 Recreational Activity and Specialised Balloon Operations) Instrument 2024.SAR means search and rescue.SARTIME means the time nominated by a pilot for the initiation of SAR action if a report has not been received by the nominated unit.SARWATCH means the time for a SAR alert, based on:(a) full position reporting procedures; or(b) scheduled reporting times (SKEDS); or(c) SARTIME.SFIS means Surveillance Flight Information Service.specialised balloon operation has the meaning given by regulation 131.020.special VFR has the meaning given in section 2.01.suitable landing area for a Part 131 aircraft means a place where, in the reasonable opinion of the pilot in command given the prevailing conditions, the aircraft can be safely landed without causing a hazard to persons or property on the ground or on the aircraft.surveillance equipment: see Division 26.10 of this MOS.tethered has the meaning given by the CASR Dictionary.the Regulations means CAR and CASR.TSO means Technical Standard Order of the FAA.VFR means the visual flight rules.VHF means very high frequency.VMC, or visual meteorological conditions, has the meaning given by the CASR Dictionary.VMC criteria has the meaning given by the CASR Dictionary.Note See Division 2.2 of this MOS.
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